Engine Controls - MIL ON/DTC's P0756/PP1701 Set
05-004/031997 B4000
AUTOMATIC - MIL ILLUMINATION WITH DTC P0756 & P1701 NO DRIVEABILITY CONCERNS
Note:
This bulletin supersedes the following TSB(s): F008/98. Please update your records accordingly.
NOTE
This bulletin supersedes F008/98. The REPAIR PROCEDURE and WARRANTY INFORMATION has been revised as of 10-6-2003.
APPLICABLE MODEL(S)/VINS
1997 B4000 with automatic transmissions
DESCRIPTION
The Malfunction Indicator Lamp (MIL) may illuminate with Diagnostic Trouble Code (DTC) P0756 and/or P1701 stored in memory.
^ P0756 may be caused by the characteristics of the 1-3 shift on the 5R55E automatic transmission combined with the sensitivity of the PCM diagnostics calibration, even though the shift solenoid # 2 is functioning properly and third gear is obtained.
^ P1701 may be caused by the shift lever not reaching the proper position.
A modified PCM calibration is available which reduces the possibility of these concerns. Customers complaining of this concern should have their vehicle inspected and if necessary have the PCM reprogrammed to the latest calibration.
REPAIR PROCEDURE
1. Verify customer complaint.
2. Retrieve and record all DTC's:
^ If DTC's P1701 or P0756 are present, proceed to STEP 3.
^ If any other DTC's are present, perform normal Workshop Manual Diagnosis.
3. Determine repair based on DTC's:
^ If P1701 and P0756 DTCs are retrieved, check and adjust the TRS and shift cable as necessary and proceed to STEP 4.
^ If P0756 is the only DTC retrieved, proceed to STEP 4.
^ If P1701 is the only DTC retrieved, cheek the Transmission Range Sensor (TRS) alignment and shift cable adjustment for proper shift indicator function.
^ If adjustment is necessary, adjust the TRS or shift cable and proceed to STEP 5.
^ If adjustment is not necessary, proceed to STEP 4.
4. Use WDS to verify whether a later calibration is available.
^ If the vehicle already has the latest calibration, refer to the workshop manual troubleshooting and repair information.
^ If a later calibration is available (refer to "Calibration Information" table), reprogram the PCM using WDS B12M or later software by following the "Module Reprogramming" procedure.
NOTE:
^ Always update the WDS PTU first, then install the needed calibration file that WDS shows during PCM reprogramming. Go to "WDS Calibration" on ESI and download the "update" file. If the PTU is not updated to the latest WDS calibration level, the calibration file will not install into the PTU.
^ WDS shows the calibration part numbers after programming the PCM.
^ Please be aware that PCM calibration part numbers and file names listed in any Service Bulletin may change due to future releases of WDS software, and additional revisions made to those calibrations for service related concerns.
^ When reprogramming a PCM, WDS will always display the "latest" calibration P/N available for that vehicle. If any calibration has been revised/updated to contain new information for a new service concern/issue, it will also contain all previously released calibrations.
^ When performing this procedure, if the WDS PTU is not docked and connected to 115V-120V, we recommend that a battery charger be installed on the vehicle battery and turned ON to a maximum charge of no more than 20 AMPS to keep the vehicle battery up to capacity. If you exceed 20 AMPS, it will damage the WDS PTU.
^ Install an "Authorized Modification" label (P/N 9999-95-AMDC-97) with the new calibration information next to the Emission Control sticker on the radiator support. The "Authorized Modification" label will inform technicians of the PCM calibration change if future repairs are necessary.
5. Verify repair.
NOTE:
After reprogramming a PCM, it is necessary to road test the vehicle to relearn KAM (Keep Alive Memory) strategy and verify no MIL illumination or DTC's are present.
WARRANTY INFORMATION
NOTE:
This information applies to verified customer complaints on vehicles covered under normal warranty. Refer to the SRT microfiche for warranty term information.
^ Claim the applicable labor operation(s) based on the repair procedure performed.
^ YY156XRX and YY157XRX are not to be used in conjunction with YY155XRX.