Fuel Gauge - Intermittently Inoperative
NO: 08-28-96GROUP: Electrical
DATE: Sept. 6, 1996
SUBJECT:
Intermittent Inoperative Fuel Gauge
MODELS:
1996 (ZJ) Grand Cherokee
SYMPTOM/CONDITION:
The fuel gauge may operate intermittently. The gauge may work fine for several vehicle starts and then not operate for one start, returning to normal operation after the next start.
DIAGNOSIS:
If customer complaints are received stating that the fuel gauge will intermittently, perform the Repair Procedure.
EQUIPMENT/PARTS REQUIRED:
1 CH6000 Scan Tool (DRB III)
1 CH7035 General Purpose Interface Bus Cable (GPIB)
1 CH7000 J1962 Cable
1 4669020 Label - Authorized Software Update
1 4275086 Label - Authorized Modification
REPAIR PROCEDURE:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (calibration change).
NOTE:
MDS AND DRB III ARE REQUIRED TO PERFORM THE FOLLOWING REPAIR. MDS MUST BE OPERATING WITH RELEASE 20 OR HIGHER AND TIL 1115 OR HIGHER INSTALLED.
1. Connect the MDS to the DRB III and connect the DRB III to the vehicle 16-way Data Link Connector (DLC) and power them up.
2. Use the arrow keys and select # 2 MDS DIAGNOSTICS on the DRB III MAIN MENU Screen.
3. Use the arrow keys and select DIAGNOSTIC MENU on the MDS, then press NEXT MENU.
4. Use the arrow keys and select VEHICLE CONTROLLER PROGRAMMING on the MDS, then press NEXT MENU.
5. Use the arrow keys and select PROGRAMMING OF ALL OTHER CONTROLLERS WITH MDS AND DRB III on the MDS, then press NEXT MENU.
6. Follow the steps presented on the MDS and DRB III which will allow the DRB III to obtain the current part number of the PCM.
7. The MDS will display the part number of the PCM on the vehicle and the appropriate replacement part number, then press NEXT MENU to begin programming.
If the PCM on the vehicle has already been updated or programmed, a NO UPDATES AVAILABLE message will be displayed. Check the part number of the PCM on the vehicle and compare it to the part number displayed. If the PCM has already been updated, then a system problem exists and should be corrected.
8. The MDS and DRB III will prompt for any operator action needed during the remainder of the programming process.
NOTE:
THE FOLLOWING STEPS ARE REQUIRED BY LAW.
9. Type the necessary information on the "Authorized Software Update Label" P/N 4669020. Attach the label to the PCM and cover the label with a clear plastic overlay.
10. Type the necessary information on the Authorized Modification Label and attach the label near the under hood Vehicle Emission Control Information (VECI) Label.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 08-19A5-99 0.5 Hrs.
FAILURE CODE: FM - Flash Module