Archive for May 2014

The Camaro Z/28 Returns

2014 Chevrolet Camaro Z/28

Fig 1

 

The 2014 Camaro Z/28 has returned as the most track-capable model in its history. Weighing 300 pounds (136 kg) less than the Camaro ZL1, the aerodynamically-optimized Camaro Z/28 accumulated 1,000 miles (1,600 km) of testing on Germany’s legendary Nürburgring road course, turning in a fastest lap of 7:37.40.

 

Click to see the Camaro Z/28 in action.

 

Weight savings on the Camaro Z/28 include:

• Elimination of the tire-inflator kit, except where it’s required by law

• Removal of some interior sound deadener, as well as trunk carpet

• Use of a smaller, lighter battery

• Thinner rear-window glass – 3.2 mm vs. the standard 3.5 mm

• Elimination of High-Intensity Discharge (HID) headlamps and fog lights

• No air conditioning, except as part of the single option package (package includes air conditioning and six audio speakers).

 

Powertrain

 

The Camaro Z/28 is equipped with a 7.0-liter V8 engine (RPO LS7) that produces 505 horsepower and 481 lb.-ft. of torque. The only transmission available is the TREMEC (TR6060) 6-speed manual transmission.

 

The V8 engine uses a unique open air box intake system featuring a K&N conical air filter. (Fig. 2) The air cleaner seals around the bottom of the hood, reducing the chance of recirculated hot air being drawn into the engine.

 

2014 Chevrolet Camaro Z/28

Fig 2

 

The engine also uses a dry-sump oil system and is filled with 5W-30 Mobil 1™ oil. Engine oil capacity is 10.0 qt. (9.5 L). The dry-sump system enables high lateral acceleration without a loss in oil pressure or delivery.

 

TIP: Check the oil level only after the engine has thoroughly warmed up. After the engine is turned off, wait 5-15 minutes before checking the oil level for an accurate reading.

 

Power is distributed to the rear wheels via a Torsen limited-slip differential featuring a helical gear set, rather than traditional clutch packs, for optimal traction.

 

The Camaro Z/28 is equipped with Performance Track Management (PTM), a feature that tailors the performance of the Z/28 to match the driver’s skills and driving conditions. This advanced system integrates steering effort calibrations, traction control, and stability control. Five driver-selectable PTM performance modes are available.

 

Suspension

 

100% of the un-sprung mass (suspension, wheels, tires and brake system) is unique for the Camaro Z/28 when compared to SS models.

 

The front suspension includes double-ball joint multi-link struts, a direct-acting 25 mm solid stabilizer bar, progressive-rate coil springs and inverted monotube shock absorbers. The rear suspension incorporates a 4.5-link independent design with progressive-rate coil springs over monotube shock absorbers and a 26 mm solid stabilizer bar.

 

The Camaro Z/28 is one of the first production cars fitted with race-proven, spool-valve dampers (shock absorbers). (Fig. 3) These dampers allow four-way damping control, enabling precise tuning to both bump and rebound settings for high-speed and low-speed wheel motions. The wide tuning range also allows dramatically greater damper stiffness without a significant change in ride quality.

 

F03 Z28 dampers

Fig 3

Brakes and Tires

 

The Camaro Z/28 is equipped with four-wheel disc brakes with Brembo Carbon Ceramic Matrix™ ventilated two-piece front and rear rotors. The large 394 x 36 mm front rotors are paired with six-piston calipers. (Fig. 4) The 390 x 32 mm rear rotors are paired with four-piston calipers.

 

TIP: Due to the floating design of the brake rotor, the front brake rotor cannot be refinished. If the front brake rotor is found to be at or below the minimum specification, it must be replaced.

 

2014 Chevrolet Camaro Z28

Fig 4

 

Any brake system has a normal break-in period before optimum performance is realized. The Camaro Z/28 brakes are no different. If aggressive street braking is performed, it should be noted that some “green” fade may occur on subsequent stops. This will feel like longer than expected pedal travel for the desired deceleration. This is normal and considered part of the burnishing process.

 

A subtle growl sound may be heard coming from the front or rear brakes during light brake apply. This is normal and part of having new carbon ceramic brakes. The condition can be eliminated by performing the “Street High Performance Brake Burnishing Procedure.” When brake pads have optimum burnish, there may be a white chalky appearance visible on the pad edge near the rotor surface. This will be more apparent on front pads.

 

The Camaro Z/28 is equipped with Pirelli 305/30ZR19 PZero Trofeo R tires. These are competition-oriented tires that use a special tread pattern and compound. The wear performance and life of the tires will be markedly different than most tires.

 

The Camaro Z/28 uses 19-inch forged aluminum wheels. Wheels are staggered: 19 x 11 inch aluminum (front) and 19 x 11.5 inch aluminum (rear). A special rim protector is built into each tire that puts rubber over the aluminum of the outer rim for protection when parking. (Fig. 5)

 

2014 Chevrolet Camaro Z/28

Fig 5

 

Body Design

 

The front fascia of the Camaro Z/28 has a large lower “splitter” to reduce front lift and force air through the larger lower grille. The larger openings, splitter and hood extractor all combine for a significant increase in cooling capacity for the powertrain.

 

The front splitter is a large aero panel that is designed to withstand 250 pounds of downforce at its tip, enhancing cornering capability and high-speed stability. It is matched with an aero closeout panel under the front of the engine compartment. (Fig. 6)

 

2014 Chevrolet Camaro Z/28

Fig 6

 

The Camaro Z/28 underbody incorporates a belly pan that also helps reduce front lift. The underbody belly pan must be removed before performing service work, including oil and filter changes.

 

Pre-Delivery Inspection (PDI)

 

Only hand washing of the Camaro Z/28 is recommended. Damage may occur to the tires, wheels, front fascia, and rockers if the vehicle is driven through an automatic carwash. Do not apply wax or polish to the flat black portion of the hood or extractors.

 

If a vehicle is washed in a touch-less carwash:

• Do not attempt to use a car wash that has tracks that guide the vehicle through

• Do not attempt to use the car wash if there are locating features that protrude above the surface by more than 3 in. (75 mm)

• Use care when exiting the wash. As with any brake system, soaps or waxes found in the automatic carwash can spray onto the brakes. When this occurs, it may affect the vehicle’s capability to stop or accelerate. Apply light brake pressure when exiting the wash

 

The front splitter is shipped inside the vehicle from the assembly plant. Installation instructions are included with the front splitter and also can be found online in the appropriate Service Information.

 

Remove the spring spacers from the front suspension (Fig. 7) and place them in the glove box for the customer.

 

TIP: If the car is to be loaded on a trailer for any reason, the spacers need to be placed back in the front springs to obtain ground clearance.

 

F07 Z28 spring spacer

Fig 7

 

– Thanks to Gary Kirrkamm and Ann Briedis

 

Wicker Bill Spoiler Installation

A new accessory for 2014-2015 Camaros is the wicker bill spoiler (part number 23200130), which adds up to 150 lbs. of downforce to the rear of the vehicle at high speeds. The wicker bill spoiler (Fig. 8) is compatible with the 2014 accessory wing spoiler (RPO SB3). It is not restricted to only Z/28 models.

 

2014 Chevrolet Camaro Z/28

Fig 8

 

During installation of the wicker bill spoiler, the template should be lined up on the lower feature line of the Original Equipment (OE) spoiler to ensure a consistent gap at the top of the template to the top of the spoiler. (Fig. 9)

 

F09 spoiler template 1

Fig 9

Seven holes are drilled in the OE spoiler. (Fig. 10) Use a graduated drill bit due to the irregular hole size required for the M8 riv-nuts. The riv-nuts should easily slide in and out of the drilled holes.

 

F10 spoiler holes 2

Fig 10

 

Install the M8 riv-nuts using the M8 riv-nut installation tool. (Fig. 11) The correct tool must be used to ensure proper installation of the riv-nuts. The riv-nut installation tool (BO-42151-8MM-KIT) can be ordered by calling 1-800 GM TOOLS (1-800-468-6657) or online using the Service Workbench link in GM GlobalConnect.

 

F11 spoiler riv-nuts 3

Fig 11

 

Rubber grommets are placed over the M8 riv-nuts to prevent water intrusion. In addition, two rubber grommets are added to the decklid stops.

 

For a copy of the complete installation instructions, refer to the Camaro Accessory Installation Manual available in the Service Information.

 

– Thanks to Ann Briedis

Take the 2014 TechLink Reader Survey

At TechLink, our goal is to provide the latest GM technical news and repair information to help you quickly and accurately repair the vehicles that come into your service department every day.

 

We would like your thoughts on how we’re doing. Click here or the Survey link on the right side of the home page to take a short survey about the information you want most in TechLink.

 

Don’t wait! The survey will be available only until the end of May.

 

We typically cover a wide range of topics, from the latest diagnostic and technical repair information to Techline programming, new model features, special tools and more. We’d like to hear from technicians and other service department professionals about the types of repair information to cover and which new topics are of interest and value.

 

Your input will help in determining the coverage in future editions. Thanks for taking the time to complete the survey. We’ll share the results when the survey is complete.

 

– Thanks to Lisa Scott

Proper Lifting of the ATS and CTS Sedan

When lifting the 2013-2014 ATS and 2014 CTS Sedan on a hoist, the vehicle should be lifted so that the hoist pads and/or lift arms do not contact the rocker panel molding. Each hoist pad must be located in the designated area in order to prevent any damage to the vehicle. (Fig. 12)

 

F12 lift 1

Fig 12

 

In the front location, place the lift pads on the rocker outer panel weld flange. (Fig. 13)

 

F13 lift 3

Fig 13

 

In the rear location, place the lift pads on the rocker outer panel rear cradle brace. (Fig. 14) Ensure the hoist pad is inside the rocker panel molding cut out area (notch).

 

F14 lift 4

Fig 14

 

Damage may occur to the rocker panel molding where it contacts the lower front of the quarter panel (dog leg) if the rear hoist pad contacts the rocker panel molding and shifts the position of the molding, which may result in the paint peeling where it meets the step in the body panel. (Fig. 15)

 

F15 lift 2

Fig 15

 

– Thanks to Mark Gordon

 

Full-Size Trucks’ Exhaust System Conditions

Two exhaust system noise conditions may be heard on some 2014 Silverado 1500 and Sierra 1500 trucks equipped with the 4.3L V6, 5.3L V8 or 6.2L V8 engine (RPOs LV3, L83, L86) built prior to December 8, 2013 or on vehicles with a muffler Julian date of 352 2. In addition, a vibration condition may be felt when Active Fuel Management engages.

 

The first noise condition is a rattle, buzz and/or pop (oil canning) noise heard coming from the exhaust system under different conditions. The exhaust system rattle can be diagnosed by tapping on the bottom of the muffler. The correction of the muffler pop or oil canning noise will require the replacement of the cold end or back half of the exhaust system.

 

The second noise condition is a whistle noise heard coming from the muffler area of the exhaust system. To diagnose this condition, temporarily lock the Passive Exhaust Valve (PEV) in the open position. (Fig. 16)

 

Equipped on all light-duty trucks, the Passive Exhaust Valve, located behind the muffler, acts as a broadband tuner in both V4 (Active Fuel Management) and V8 mode for a more refined sound.

 

F16 pev 1

Fig 16

 

Rotate the Passive Exhaust Valve counterclockwise. (Fig. 17) For testing purposes only, install a 1/4″ x 20 x 2” steel bolt, nut, lock washer and two large standard 1/4″ x 1” outside diameter washers (body washer) in the Passive Exhaust Valve. (Fig. 18)

 

F17 pev 2

Fig 17

 

F18 pev 3

Fig 18

 

If the condition is reduced or changes greatly in severity with the bolt installed, replace the exhaust system.

 

The vibration condition may be noticed in the seat or steering wheel when the truck engages V4 mode (Active Fuel Management).

 

After verifying the condition, check the exhaust system for Ground Outs at the mounts and repair as necessary. For testing purposes only, install the bolt, washers and nut as described above. If the condition is reduced or changes greatly in severity, replace the exhaust system.

 

– Thanks to Peter Joslyn

Radio Displays Alert Point Messages

The radio of the 2014 Chevrolet SS may intermittently display one of several messages at the bottom of the radio screen, such as Camera Nearby, Railroad Crossing, or School Zone. The messages will only appear on the radio for several seconds while driving. These messages will be very difficult to reproduce. No DTCs will be set.

 

These radio messages are referred to as Alert Points and they are displayed to alert the driver of the presence of various issues or zones surrounding the vehicle. The Camera Nearby message indicates the presence of a traffic camera that has been placed near an intersection. The Railroad Crossing message indicates the presence of a nearby set of railroad tracks that crosses a public road. The School Zone message indicates that the vehicle is traveling near an established school.

 

This information originates from the software in the navigation portion of the radio. It is in not related to the XM weather or traffic system features. Because it is a function of the navigation software, drivers may not be alerted to all cameras, railroad crossings, and/or school zones that may be present, depending on the current year’s mapping data.

 

The Alert Points messages can be turned off by going into the Configuration and Navigation menus (Fig. 19) within the radio and deselecting the option. Please communicate to the customer that this condition is a normal operating characteristic of the vehicle.

 

F19 Configuration settings

Fig 19

 

 

– Thanks to Matt Bierlein

Inoperative Power or Memory Seat, Power Adjustable Pedals

On some 2015 Tahoe, Suburban, Yukon and Yukon XL models, the driver’s power seat or the memory seat functions may be inoperative. In addition, the power adjustable pedals (if equipped) may be inoperative.

 

While performing diagnosis, check terminal tension at the left Instrument Panel fuse block (X51L) connector X1, terminal 27 (Fig. 20), with test probe J-35616-35 (VT). If the terminal is found to have poor tension, it will need to be replaced.

 

F20 fuse block

Fig 20

 

The terminal is available from the Warranty Parts Center (WPC). The WPC part number is WPC751. Please fill out the WPC request form and submit. Since there is a very limited supply, it’s requested that only the number of terminals required to repair the vehicle be ordered.

 

– Thanks to James Will

Liftgate or Liftglass Interference

There may be a pop or scrape noise heard when the liftgate or liftglass is opened on some 2015 Suburban, Tahoe, Yukon and Yukon XL models built prior to March 11, 2014. In some cases, the power liftgate (if equipped) may reverse when opening.

 

This condition may be caused by the liftgate spoiler contacting the roof. It is more noticeable with thermal expansion caused by the sun.

 

Some vehicles are equipped with shims located between the left hinge and spoiler. (Fig. 21, 22) If shims are present, remove them and reassemble. The complete spoiler does not need to be removed to access the shims.

 

F21 3783527

Fig 21

 

F22 3783530

 Fig 22

After removing all of the spoiler attachment fasteners, close the liftglass and lift up on the spoiler to inspect for shims and remove them if they are present. Retest for the condition by parking the truck in the sun for a few hours.

 

If the condition is not corrected by removing the shims, the spoiler will need to be replaced.

 

– Thanks to James Will

 

Understanding Fastener Tightening Specifications

The desired result of tightening a fastener is to obtain a proper clamping force between the parts. The clamping force prevents loosening when the vehicle is in use and external forces act on the clamped parts.

 

All fasteners have a specified torque. The method used for a particular application is determined by Engineering and specified in the Service Information. It is necessary to apply the fastener torque to the specific fastener identified. Applying torque to the mating fastener can damage the fastener, mating components, or provide insufficient clamp load. For example, when installing the adjust link on the 2014 Corvette rear suspension, the Service Information calls for tightening the adjust link nut to 70 N·m (52 lb. ft.), not the cam bolt.

 

There are three different methods for the specification of tightening fasteners: Torque (T), Torque Plus Angle (TA), and Torque Plus Angle to Yield (TAY). Torque Plus Angle to Yield (TAY) is sometimes referred to Torque To Yield (TTY).

 

A fastener specification of Torque Plus Angle (TA) — for example, 30 N·m (22 lb. ft.) + 120 degrees — has more clamping force than a fastener specification of Torque (T) — for example, 30 N·m (22 lb. ft). A fastener specification of Torque Plus Angle to Yield (TAY) has more clamping force than a fastener specification of Torque Plus Angle (TA).

 

Torque (T)

 

A fastener with a Torque (T) specification can be tightened with a conventional torque wrench.

 

TIP: Generally, externally threaded fasteners (bolts, screws, studs) tightened to this specification method can be reused, unless otherwise specified in the Service Information.

 

Torque Plus Angle (TA)

 

A fastener with a Torque Plus Angle (TA) specification must be tightened first to the torque part of the specification and then must be tightened further by the addition of the specified angle. The angle must be applied relative to the mating fastener, if present, or relative to the mating surface. A backup wrench must be used, if required, to prevent the rotation of the mating fastener while the angle is added to the fastener with the Torque Plus Angle (TA) specification.

 

TIP: Generally, externally threaded fasteners tightened to this specification method can be reused, unless otherwise specified in the Service Information.

 

Torque Plus Angle to Yield (TAY)

 

A fastener with a Torque Plus Angle to Yield specification (TAY) (Fig. 1) is tightened in the same way as the fastener with the Torque Plus Angle (TA) specification.

 

The difference between a Torque Plus Angle (TA) specification and a Torque Plus Angle to Yield (TAY) specification is the tightening results in permanent deformation of the externally threaded fastener.

 

TIP: Externally threaded fasteners tightened to this specification method must not be reused and must always be replaced if loosened.

 

F01 TAY bolt

Fig 1

 

Tightening in Stages

 

Generally, Service Information specifies a fastener tightening specification in stages. An individual fastener with a Torque (T) specification is tightened to the specified torque in one pass.

 

For Torque Plus Angle (TA) and Torque Plus Angle to Yield (TAY) specification fasteners, the fasteners are tightened in stages. All the fasteners are tightened to a torque specification on the first pass. Next, they receive another tightening to a specified angle (in degrees) on the second pass. Sometimes, more than two passes are required. Always refer to the appropriate Service Information for proper tightening in stages.

 

On applications with more than one fastener, such as wheel nuts or cylinder head bolts, the fasteners should be tightened to specification by alternating between the fasteners to ensure the parts are not distorted and that the fasteners are torqued evenly. Once a specified minimum of torque has been achieved for each bolt, the bolts should be tightened completely to specification.

 

Reusing the Fastener

 

Think of an externally threaded fastener (bolt, screw or stud) as a spring. As a Torque (T) or Torque Plus Angle (TA) tightening specification is applied, the spring (externally threaded fastener) is stretched. With a Torque (T) or Torque Plus Angle (TA) tightening specification, the spring returns to its original length (elastically stretched) when loosened. In the case of a Torque Plus Angle to Yield (TAY) tightening specification, the spring is overstretched (plastically deformed) and does not return to its original length. For this reason, the Torque Plus Angle to Yield (TAY) tightening specification requires the externally threaded fastener to always be replaced.

 

In the Service Information, the following warning will be shown when a Torque Plus Angle to Yield (TAY) specification fastener is used:

 

Torque-to-Yield Fastener Warning (2406051)

Caution: This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fastener could cause damage to the vehicle or component.

 

TIP: There is no effect to the object in which the externally threaded fastener is threaded. It can be either a nut or a threaded hole in a component. If a nut is present, it can be reused.

 

Why Do Engineers Specify TA or TAY Torque Specifications?

 

With the added benefit of increased clamping force, a smaller fastener can be used when a Torque Plus Angle (TA) or Torque Plus Angle to Yield (TAY) tightening specification is quantified. For example, an M12 size bolt with a Torque Plus Angle to Yield (TAY) specification can be used in place of an M16 size bolt with a Torque (T) specification. The use of Torque Plus Angle (TA) and Torque Plus Angle to Yield (TAY) specifications result in a reduction in the vehicle weight and, therefore, improved fuel economy.

 

– Thanks to Jonathan Johnson

Using the J-45059 Angle Meter

The J-45059 Angle Meter (Fig. 2) is used to ensure proper fastener tightness when tightening fasteners with a Torque Plus Angle (TA) and Torque Plus Angle to Yield (TAY) specification. It’s designed for use with a standard 1/2-inch drive extension and a ratchet or torque wrench.

F02 anglemeter

Fig 2

 

TIP: The fastener must already be tightened to the specified initial torque before applying the angle specification.

 

These are the highlights on using the tool. Refer to the instructions that come with the meter for full details.

 

• Begin by turning on the meter; the last-set value will display. Use the up/down arrows to set the display to the desired angle value. The range is 0-199° in 1° increments.

 

• Attach the meter to the 1/2-inch extension, as close as practical to the socket, using the spring-loaded clamp.

 

• Install the socket to the fastener. Without turning the fastener, apply pressure in the direction of tightening to remove all free play from the wrench. Then press and hold the On/Zero button until the meter sounds a short beep and flashes.

 

• Tighten the fastener. When the preset angle is reached, the meter sounds a long beep and flashes.

 

• After use, the meter will shut itself off within a minute to conserve battery power.

 

– Thanks to Jonathan Johnson

 

 

MDI Backup Batteries

The Multiple Diagnostic Interface (MDI) tool features a temporary backup power source — four AAA batteries (Fig. 3) — for use during a crank event or in the event the DLC cable is accidently disconnected during a programming event.

  F03 mdi batteries

Fig 3

 

 

Due to the limited use of this power source, the batteries tend to reside in the MDI unit for extended lengths of time. This can increase the chances of the batteries leaking and causing damage to the unit. It’s recommended that the batteries be checked periodically for leakage. The batteries should be replaced often to prevent this scenario.

 

If your MDI has been damaged in this manner, refer to the following GlobalConnect messages for express exchange details:

 

U.S. Dealers: G_0000170664 Techline News: Introducing MDI Express Exchange

07/15/2013

Attention: All Service Department Personnel

 

As of July 11th, Bosch now offers an Express Exchange Program for the MDI (Multiple Diagnostic Interface) tool for out-of-warranty units. If desired, a dealer can pay $395 plus freight to receive a replacement MDI the next day. The dealer will return the faulty unit with the included UPS shipping label. No USB, DLC or power cords are sent with the replacement unit and the dealer should retain the cables as well. The replacement unit comes with a 90-day repair warranty. The standard option is still available. Using this method, a dealer sends the faulty unit to Bosch. Once the fault is determined, Bosch will contact the dealer with repair costs, fix the unit and ship it back.

 

If Bosch receives a counterfeit MDI in their repair center, the dealer will be contacted and charged a diagnostic fee. The counterfeit MDI will be returned to the dealer. This dealer will no longer be eligible for the Express Exchange Program.

 

If you have any questions about this communication, contact the Techline Customer Support Center (TCSC) at 1-800-828-6860.

 

Canadian Dealers: G_0000171587 Techline NEWS: Introducing MDI Express Exchange

7/29/2013

Attention: Service Manager and Technicians

 

We are pleased to inform you that Bosch now offers GM dealers an Express Exchange program for the GM Multiple Diagnostic Interface (MDI) tool. Custone Electromotive Inc. is the authorized service facility for Bosch Diagnostics in Canada, providing repair and exchange services for the Tech 2, CANdi modules and MDI tools. If a concern with your MDI tool is encountered, first contact the Techline Customer Support Centre (TCSC) for assistance in diagnosing the concern. If it is determined that the MDI unit needs repair, dealers will be advised to contact Custone Electromotive. For “out-of-warranty” units, Custone is now able to offer dealers a choice of the new Express Exchange Program or, if preferred, the standard repair option as before.

 

MDI – Express Exchange Program:

• Flat fee, CAN$ 454.00 plus freight and taxes

• Major credit cards accepted (Visa, MasterCard)

• A replacement MDI will ship same day on orders received before 1:00 PM (ET)

• Upon receipt, dealer must return their faulty unit using the included shipping label

   – Ensure the old wireless card remains mated and intact within the MDI tool before returning (replacement MDI unit    comes with a wireless card fitted within the tool)

   – Cables are NOT included with the replacement unit (dealers should retain their USB, DLC and Ethernet cables, power    adapter and USB Cable Keeper)

• The replacement MDI unit comes with a 90-day repair warranty

 

MDI – Standard Repair Option:

• This standard option remains available

• Dealer sends the faulty unit to the Bosch service centre (Custone Electromotive)

• Once the fault is determined, Custone will contact the dealer with a repair cost estimate

• If authorized, the unit will be repaired and shipped back

 

ATTENTION: Exercise caution if considering purchasing Bosch products from an unauthorized distributor. It has come to the attention of Bosch that counterfeit Tech 2 testers, CANdi modules and MDIs are being offered for sale to service technicians worldwide, often by online sellers. If Bosch receives a counterfeit MDI at the repair center, the dealer will be contacted and charged a diagnostic fee. The counterfeit MDI will be returned to the dealer. The dealer will no longer be eligible for the Express Exchange Program.

 

If you have any questions about this communication, contact the Techline Customer Support Center (TCSC): 1-800-828-6860 English or 1-800-503-3222 French; or Custone Electromotive: 905-668-2664, www.custone.com/cei/

 

– Thanks to Chris Henley

 

Take the 2014 TechLink Reader Survey

At TechLink, our goal is to provide the latest GM technical news and repair information to help you quickly and accurately repair the vehicles that come into your service department every day.

 

We would like your thoughts on how we’re doing. Click here or the Survey link on the right side of the home page to take a short survey about the information you want most in TechLink. The survey will be available until the end of May.

 

We typically cover a wide range of topics, from the latest diagnostic and technical repair information to Techline programming, new model features, special tools and more.We’d like to hear from technicians and other service department professionals about the types of repair information to cover and which new topics are of interest and value.

 

Your input will help in determining the coverage in future editions. Thanks for taking the time to complete the survey. We’ll share the results when the survey is complete.

 

– Thanks to Lisa Scott

 

Return Connector with Shifter Handle

Some shifter handles on some 2014 CTS Sedans have been replaced for a Service Transmission Soon message on the Driver Information Center (DIC) and an inoperative Manual Mode (M) button on the shift knob. DTC P0827 (Up and Down Shift Switch Circuit Low Voltage) may be stored.

 

Some shifter handles returned to the Warranty Parts Center (WPC) have had the wires separated from the small white connector and the connector was not returned with the shifter knob. The connector has a wire crimp inside it that is crucial to analyzing the root cause of this condition.

 

If the white connector is separated from the wires on the shifter knob, (Fig. 4) locate it and ensure it is returned with the shifter handle to the WPC.

 

F04 handle with connector

Fig 4

 

– Thanks to Jean Hart

 

Backup Camera Inoperative

The Rear Vision Camera (RPO UVC) may be inoperative on some 2013-2014 Malibu models.

 

When diagnosing this condition, first verify that connector X220 is properly connected. Connector X220 is a black 16-way connector located behind the passenger kick panel. (Fig. 5) It may have as few as 3 wires or up to 13 wires in the connector.

 

Secure the connector and check the operation of Rear Vision Camera.

 

F05 3802826

Fig 5

 

– Thanks to Christopher Crumb

Heated Seat May Turn Off

On some 2014 Corvettes built prior to April 5, 2014, the heated seat may turn off within a few minutes of being turned on. It can be turned on again, but may turn off again by itself. This condition may be intermittent, depending on the seat’s position. DTC U1524 (Lost Communication with Seat Heating Control Module) also may be set.

 

This condition may be caused by a pinched wire in the seat assembly. Inspect the seat cushion and seat back heater element harnesses near the rear inboard corner of the seat assembly. (Fig. 6) It may be difficult to access this area without first removing the seat assembly from the vehicle.

 

F06 3813385

Fig 6

 

If the harness is pinched, repair the wiring, reroute the harness and use a tie strap to hold the harness away from any pinch points. (Fig. 7)

 

F07 3813387

Fig 7

 

– Thanks to Jeremy Richardson

Roof Beacon Lighting Harness

On 2015 Silverado, Sierra; and 2014 Silverado 1500 and Sierra 1500 models equipped with Roof Lamp/Beacon Wiring Provisions (RPO TRW) or the Snow Plow Prep Package (RPO VYU), the location of the blunt cut wires for the roof beacon are located directly above the overhead roof console. (Fig. 8)

 

Remove the complete overhead roof console to access the two wires that are taped to the harness. The roof beacon relay also is located directly above the overhead roof console.

 

F08 3794424

Fig 8

 

– Thanks to Jim Will

Service Know-How

10214.05D – Emerging Issues

May 8, 2014

 

To view Emerging Issues seminars:

• Log in to www.centerlearning.com

–   Select Resources, and then Video on Demand; or

–   Select Catalog to search for the course number, and then select View > Take or Continue Course

 

Car Issues – Fix It Right the First Time

 

Screen Shot 2014-05-09 at 11.13.47 AMScreen Shot 2014-05-09 at 11.14.16 AM

Truck Issues – Fix It Right the First Time

 

Screen Shot 2014-05-09 at 10.59.52 AM

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