Inventory Upgrade - PCM Calibration Update
| Subject: | PCM Calibration Update |
| Models: | Certain 2006 Chevrolet Tahoe, Suburban and GMC Yukon, Yukon XL equipped with 5.3L (RPO L59) V8 engine |
| Attention: | An involved VIN listing is contained in the Administrative Message. This upgrade should be performed on affected vehicles currently in your inventory prior to sale or delivery as soon as possible, but no later than October 31, 2005, at which time this bulletin will expire. |
Condition
The PCM Calibration has been revised to improve capability to learn the percentage of ethanol in the fuel.
Correction
Dealers are to reflash the PCM calibration and reset the Ethanol composition.
Service Procedure
Perform this service procedure on vehicles in dealer inventory that have not been refueled with E85 fuel. If you have added E85 fuel to the fuel tank of the vehicle, please refer to Preliminary Information (PI) # PIP3516 for additional information.
Notice: Before reprogramming, please check the battery condition to prevent a reprogram error of the PCM due to battery discharge. Battery voltage must be between 12 and 16 volts during reprogramming. If the vehicle battery is not fully charged, use jumper cables from an additional battery. Be sure to turn off or disable any system that may put a load on the battery such as automatic headlamps, daytime running lights, interior lights, heating, ventilation, and air conditioning (HVAC) system, radio, engine cooling fan, etc. A programming failure or control module damage may occur if battery voltage guidelines are not observed.
The ignition switch must be in the proper position. The TECH 2 prompts you to turn ON the ignition, with the engine OFF. DO NOT change the position of the ignition switch during the programming procedure, unless instructed to do so.
Make certain all tool connections are secure, including the following components and circuits:
| • | The control module Serial Data Link Tester |
| • | The RS-232 communication cable port |
| • | The connection at the data link connector (DLC) |
| • | The voltage supply circuit |
DO NOT disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or control module damage may occur.
DO NOT turn OFF the ignition if the programming procedure is interrupted or unsuccessful. Ensure that all control module and DLC connections are secure and the TIS terminal operating software is up to date. Attempt to reprogram the control module. If the control module cannot be programmed, replace the control module.
Important: Do not attempt to order the calibration number from GMSPO. The calibration numbers are programmed into the PCM via a Techline TECH 2 scan tool and the Techline Information System (TIS) 2000 terminal with the calibration update. Use data version 8.0 or later, broadcasted to dealers on August 7, 2005; and on TIS CD-ROM version 8.0 / 2005, mailed to dealers beginning August 11, 2005. To complete this service procedure, the TECH 2 must also be updated to release 25.007 or greater. If you cannot access TECH 2 release 25.007 call the Techline Customer Support Center at 1-800-828-6860 and it will be provided.
Reprogram PCM using TECH 2 Remote Programming Method.
- Use normal "request method" through "Service Programming System" to request information from vehicle.
- At Techline Terminal enter TIS SPS programming system.
- Select TECH 2 from the "Select Diagnostic Tool" window.
- Select Reprogram ECU from the "Select Programming Process" window.
- Select Vehicle from the "Select ECU Location" window
- Select Next to go to the "Preparing for Communication" instruction screen
- Select Next to view the "Validate Vehicle ID Number" screen.
- Select Next to view "Supported Controllers" screen.
- Select PCM/VCM Powertrain/Vehicle Control Module from "Supported Controllers" window.
- Select Next to view the "Select Programming Type" window.
- Select Normal from the "Select Programming Type" window.
- Select Next to view the "Service Programming System Calibration Selection" screen.
- Select Next to view "Summary" screen.
- Verify that the following information is displayed on the "Summary" screen (see table below).
- Select Next to download the calibration to the TECH 2.
- Enter "Service Programming Systems".
- Select Program ECU and follow on screen instructions.
- Make sure to turn OFF the ignition for 30 seconds after the "Programming is Complete" screen is displayed. Clear diagnostic trouble codes (DTCs), if required.
ID | Current # | Selected # |
|---|---|---|
2 | 12591374 or 12604550 | 12605121 |
2 | 12591376 or 12604551 | 12605122 |
2 | 12591377 or 12604552 | 12605123 |
2 | 12591394 or 12604563 | 12605124 |
2 | 12597932 or 12604567 | 12605125 |
2 | 12597933 or 12604568 | 12605126 |
Important: Determine if E85 fuel has been added to the fuel tank. If E85 fuel has not been added to the tank of the vehicle, continue to the TECH 2 Fuel Composition Reset procedure in this bulletin. If E85 fuel has been added to the fuel tank of the vehicle, please refer to PI# PIP3516 for additional information.
TECH 2 Fuel Composition Reset
- Select Special Functions from the Powertrain menu.
- Select Fuel System from the Special Functions menu.
- Perform the Fuel Composition Reset from the Fuel System menu.
Exit TECH 2. You have completed the service procedure. Provide sales staff with the owner’s manual supplement information. Refer to page 3 to review the supplement information.
Parts Information
Do not attempt to order the calibration number from GMSPO. The calibration numbers are programmed into the PCM via a Techline TECH 2 scan tool and the Techline Information System (TIS) 2000 terminal with the calibration update.
Warranty Information
Labor Operation | Description | Labor Time |
|---|---|---|
Y0046 | Reprogram PCM and perform Fuel Composition Reset | 0.5 hr |
Dealers
This upgrade should be performed on all vehicles currently in your inventory as listed in the GM DealerWorld VIN list prior to sale or delivery.
