May 2007 Archives

In early 2005, General Motors released a newly developed automatic transmission fluid (ATF) for the factory fill of all GM Powertrain stepped-gear automatic transmissions. The new fluid provides significantly improved performance in terms of friction durability, viscosity stability, aeration and foam control and oxidation resistance. In addition, the fluid has the potential to enable improved fuel economy and extended drain intervals. Because the performance of the new fluid far exceeded that of the DEXRON-III service-fill fluids available at the time, it became necessary to upgrade the DEXRON service-fill specification in order to ensure that similar fluids were available in the market for service situations. This latest upgrade to the service- fill specification is designated DEXRON-VI (fig. 1).

Since General Motors introduced the first ATF service-fill specification in 1949, it has been necessary to upgrade the specification periodically.

The upgrading process ensures that available service-fill fluids are of an appropriate quality for use in transmissions that have been designed around the factory-fill fluid performance.

TIP: As with previous upgrades, DEXRON-VI fluids are designed to be backward compatible with earlier transmission hardware. More importantly, earlier type fluids are not forward compatible with transmission hardware that was designed to use DEXRON-VI fluid.

DEXRON-III is not compatible with the most recently designed transmissions, and the use of these earlier type fluids could result in transmission damage. All current calibrations and certification tests are now conducted with DEXRON-VI ATF. DEXRON-III fluids should not be used for those applications where the owner manual recommends the use of DEXRON-VI.

TIP: GM does not license or support obsolete ATF specifications or the use of fluids that are being marketed against cancelled specifications.

All DEXRON-III licenses expired at the end of 2006 and will not be renewed. Beyond that date, GM will support only DEXRON-VI fluids for use in Hydra-Matic transmissions. Avoid fluids sold in the market after that date bearing claims such as "suitable for use in
DEXRON-III applications" or similar wording. DEXRON-VI licensed fluids are fully backward compatible and can be used in all applications covered by earlier GM ATF specifications.

The use of unlicensed fluids and/or non-GM approved aftermarket additives may prove detrimental to transmission performance and void warranty coverage.

- Thanks to Angela Willis

In the past, you have received software updates for your essential tools on CD/DVD from SPX/Kent-Moore.The procedure has changed, and is very convenient. You can now download updates directly from the web for these essential tools:

- Vehicle Data Recorder (VDR)

- TIre Pressure Monitor (TPM)

- Active Fuel Injector Tester (AFIT)

TIP: You will receive notification of new software releases in Essential Tool flyers.

Available downloads can be found on the http://www.gmde.net website. Click the Support tab at the top of the home page. Then click on Downloads for the list of available software updates and installation instructions.

TIP: At present, the AFIT download is the only one available. Others will be added when required.

Follow the on-screen links to obtain reference materials, instructions and the download.

TIP: The download can be run only on a PC that has the application software installed on it.

(fig. 2)
Download link Support tab (A)

(fig. 3)
Click link for Update (B)
Click link for Reference Guide (C)
Click link for User Guide (D)

(fig. 4)

Click link for installation (E) instructions
Click link for download (F)  

(fig. 5)
Typical installation instructions

For additional information, contact Kent-Moore customer service at 1.800.GMTOOLS (1.800.468.6657).

- Thanks to Russ Dobson

This information applies to the dome lamps on the 2007 GMC Acadia and Saturn Outlook.

Does Not Come On -- The dome lamp may not come on when the doors are opened, but will work when manualy turned on. These vehicles are shipped with the dome lamp override activated. It is also possible to press the switch (fig. 7) when adjusting the dimmer switch, and not know it has been activated.

Before making any repairs, be sure the dome lamp override is not actived by pressing the switch and then rechecking the dome lamp operation.

- Thanks to Ron Erman

Owners of some 2007 Chevrolet Silverado and GMC Sierra 4WD models may comment about a groan noise at parking lot speeds on launch or with light to medium braking. This condition is exhibited at low mileage and goes away after approximately 200 miles.

Braking to a complete stop can force the propshaft slip yoke forward into the transfer case while the vehicle rebounds slightly backward after stopping its momentum, which creates the noise.

The slip yoke spline interface is initially dry, so part of the break-in involves a distribution of the ATF fluid.

To determine that the concern is the slip yoke and not a brake noise, attempt to duplicate while coasting with the transmission in neutral and braking to a stop. If the noise is gone while braking in neutral, the noise is NOT brake related noise.

Lube the slip yoke splines with TransGel (J36850) to help reduce the noise.

- Thanks to Chuck Krepp

This information applies to 2006-07 Chevrolet HHR and Pontiac Solstice, and 2007 Saturn SKY. A customer may experience an intermittent -- or extremely intermittent -- crank/no-start condition.

The no-start condition may be caused by a damaged terminal in the fuel pump relay circuit in the Underhood Bused Electrical Center (UBEC).

TIP: Be aware that fuel pressure bleeding down could also cause these symptoms. Follow SI diagnostics to eliminate this condition.

The UBEC consists of several parts. The top portion, where relays plug in is called the upper housing (fig. 8). The various electrical harness connectors plug into the bottom of UBEC into the lower housing.

The condition occurs if the male terminal on the bottom of the UBEC does not squarely enter the female terminal of the wiring harness connector. In some cases, the female terminal is pushed out of the connector and the locking finger is sheared off. In other cases, the female terminal becomes deformed and damaged. Regardless, the connection is not secure, and can easily become intermittent.

Figure 9 shows a damaged terminal in Connector 2 (viewed from top, with electrical center board removed)

Figure 10 shows a terminal pushed out of Connector 2 (viewed from below)

This condition is most likely to affect the fuel pump relay circuit 120, which passes through terminal E2 of Connector 2. When continuity in this circuit becomes intermittent, the fuel pump does not run.

Once the condition is located, replace the damaged components. Terminals for the harness connector are available in your Terminal Repair Kit J-38125-G. The connector with spacer and components for the UBEC are available from Service Parts Operations. If the UBEC terminals are damaged (top or bottom), a new UBEC must be installed.

IMPORTANT: Do not replace the fuel pump relay or fuel pump and sender assembly for this condition. Replacing these components will not resolve the intermittent condition in the UBEC.

- Thanks to Wayne Zigler and Jack Pantaleo

Some owners of a full-size 2007 pickup or utility may have one or all of these concerns:

- Intermittent no crank

- Starter clicks

- Vehicle starts to crank, then stops cranking.

Check the positive and negative battery cables and make sure both cables are installed correctly.

The battery post should extend 3 mm above the cable clamp before the nut is torqued
(fig. 11). The cable clamp should not be flush with the battery post (fig. 12).

If the battery clamp is flush, the clamp load will not be high enough to maintain a solid connection and could cause one of the concerns above.

If the cable clamp is not installed correctly, install the cable correctly and charge the battery if needed.

- Thanks to Paul Radzwilowicz

A number of SDMs have been returned and TAC has received calls for problems that occurred in reprogramming the SDM. Here are some tips regarding SDM reprogramming.

- Battery voltage needs to be in the normal operating range during the entire programming process. If the battery is weak, put a charger on it before programming. (Refer to July 2005 TechLink for information on chargers that are approved for use during programming. Refer to June 2006 TechLink for information on using a jumper pack during programming.)

- Do not try to reprogram the SDM if it has current codes (history DTCs are OK). Address the codes using the appropriate SI document. If an SDM is reprogrammed with current faults, other DTCs in addition to the original DTC will be set. 

- If the airbag light is blinking and there are current DTCs, address the codes using the appropriate SI document. The SDM setup cannot be completed until all current SDM DTCs are cleared. 

- If the airbag light is blinking continuously with no codes, the SDM is ready to be set up. Complete the setup procedure in the Tech 2. If the airbag lamp is still blinking after successfully completing the SDM setup procedure, complete the Rollover Sensor setup procedure on the Tech 2.

- Thanks to Gary McAdam and John Dolan

This information applies to 2007 (not Classic) extended cab pickup trucks with fixed glass in the rear side access doors (fig. 13).

A Sash screws

B Locking screw

C Crank shaft for assembly plant use

In the assembly plant, a manual window regulator and crank handle are temporarily used to raise the glass into position after the glass is installed into the run channel. Two sash screws and a locking screw secure the glass in the closed/up position. The locking screw attaches the regulator slide to the door sheet metal to prevent it from moving down after installation. A trim panel without crank hole completes the assembly.

TIP: Loosen the locking screw before lowering the glass for removal or repair.

TIP: Neither a crank handle nor a trim panel with a hole is available.

- Thanks to Steve Love

This information explains how to time the sunroof on the VUE, Equinox and Torrent.

1. Using the vehicle switches, move the sunroof glass panel as near to the closed position as possible.

2. Without removing any wiring connections, unbolt the motor from the sunroof beam. Once the motor is removed, the sunroof mechanism will be free to move.

3. Remove the glass and manually push the right and left drive cable plate until the closed position is reached.

TIP: In the closed position there should be 46mm between the rear of the locator and front of drive cable plate (fig. 14).

A 46mm

4. With the sunroof electronics still connected to the sunroof wire harness, but disconnected from the sunroof beam, press and hold the close button until the motor stops.

5. Release and again press the close button and verify that the motor and electronics think that the sunroof is in the closed position.

6. Bolt the retimed motor and electronics into the mechanically retimed sunroof.

7. Verify correct sunroof operation.

- Thanks to Angelo Girolamo

This information applies to the 2007 fullsize utilities and pickups (not Classic). Two remote start options are available for these vehicles:

AP3 -- factory installed

AP8 -- remote start prep

Here is a description of how the HVAC system operates during a remote start.

MANUAL HVAC

In a truck with manual HVAC (C42/C67/CJ3), the system uses the existing knob and thumbwheel settings in any ambient temperature.

AUTOMATIC HVAC

In a truck with automatic HVAC (CJ2), the system operates in one of three zones, depending on ambient temperature (see table).

TIP: Upon exiting remote start operation, the HVAC system returns to the settings that were in place at the end of the previous ignition cycle. Heated seats, rear defrost and heated mirrors are turned off.

TIP: There is no difference in operation whether one or two remote starts is run.

- Thanks to Steve Love

Bulletin 00-00-90-002E is being revised to correct the tire pressure for Pontiac Torrent.

The correct tire pressure is 30/30 psi (210/210 kPa) and is shown on the vehicle placard.

- Thanks to Angelo Girolamo

This information applies to the 2007 Pontiac Solstice and Saturn SKY with both the base engine and the 2.0L LNF turbo engine.

Do NOT remove the cover from the BEC (underhood fuse block) (fig. 15) when jump starting or charging the battery.

Correct Positive Cable Connection -- Use the remote positive (+) terminal located under the red plastic cover on the engine compartment fuse block (fig. 16). The cover hinges open for access to the terminal. It is not necessary to remove the large black cover from the fuse block.

Correct Negative Cable Connection -- Use the remote negative (-) ground bracket located at the rear of the engine, on the passenger side. The flange of the bracket is marked GND -.Figure 17 shows the negative connection for the turbo engine. Figure 18 shows the negative connection for the base engine.

Consequences of Incorrect Connection -- Removing the black BEC cover exposes a stud opposite the B+ terminal. THIS STUD IS NOT A GROUND. It is the positive voltage feed for the engine coolant fans. If a jumper cable or charger cable is connected to this fan feed stud, the 60 amp cooling fan fuse will blow.

- Thanks to Brad Thacher

This explains how to install the black plastic center caps to the 2007 Chevrolet Silverado with RPO N56 aluminum wheels.

Hold the center cap firmly in place on the wheel. Align the black plastic lug nut caps with the wheel lug nuts. Use a hand-held deep socket with an extension or torque stick. Apply inward pressure while hand snugging each lug cap until fully seated against the center cap. After all caps have been seated, check tightness of each cap, using the hand-held deep socket, and tighten any cap that may have loosened.

TIP: For easier installation of the caps, apply inward pressure while hand snugging each lug cap.

- Thanks to Jim Will

Some owners of a 2007 Cadillac Escalade, ESV, EXT, Chevrolet Avalanche, Silverado, Suburban, Tahoe, GMC Sierra, Yukon, Yukon XL, Denali, Denali XL may state that the passenger's front window will operate from the passenger's switch when the window lock-out feature is activated on the driver's switch. The rear windows lock-out correctly.

This feature prevents the rear passenger windows from operating from the door switches in the rear only. The driver and passenger front windows are not disabled when the lock-out switch is activated. Do not replace a door module or the BCM to try to repair this concern. This is the normal design intent of the vehicle.

- Thanks to Jim Will

This information applies to 2007 full-size pickups and utilities.

Some customers may be installing and using certain aftermarket products in conjunction with the factory Navigation Radio systems.

Normally, the DVD player output is available on the Navigation display only when the transmission is placed in Park. The aftermarket products allow an aftermarket camera or second backup camera and enables Navigation functions and video output of the DVD player on the Navigation screen at times when the transmission is not in Park.

These products can cause unusual problems that are difficult to diagnose and difficult to identify, because they are installed behind the Navigation unit and are not visible unless the Navigation unit is removed. 

These problems have been experienced when these products are installed.

- No start

- No crank

- No low speed GM LAN communications

- Various GM LAN communication DTCs

- Vehicle stability lights and messages

- TPM warning lights and messages

- PRNDL gear indicator position errors

If you suspect that your customer has installed aftermarket products of this nature, and you suspect that the product may be the cause of a concern, ask the customer if any vehicle modifications have been made.

If the customer's information is not available, test the Navigation and DVD system to see if normally blocked functions are available with the transmission in Drive. Removal of the Navigation screen will allow you to verify whether one of these products has been installed.

Warranty coverage does not extend to problems created by aftermarket devices. Damage to normally covered systems caused by aftermarket products is the responsibility of the customer or the aftermarket installer.

- Thanks to Dave Roland