Engine Controls/Steering - Idle Fluctuation on Turns
NUMBER: 18-015-04GROUP: Vehicle Performance
DATE: April 6, 2004
SUBJECT:
Idle Fluctuation While Turning
OVERVIEW:
This bulletin involves reprogramming the Powertrain Control Module (PCM), replacing the P/S pressure hose, and installing a wiring harness.
MODELS:
2002 - 2003 (AN) Dakota
NOTE:
This bulletin applies to vehicles equipped with a 3.9L engine and an automatic transmission (sales codes EHC and DGK).
SYMPTOM/CONDITION:
The vehicle operator may describe that the idle fluctuates while turning at slow speeds with their foot off the accelerator pedal i.e. parking lot maneuvers).
DIAGNOSIS:
If the vehicle operator describes or the technician experiences the Symptom/Condition and there is no P/S pressure switch in the P/S pressure hose, perform the Repair Procedure.
PARTS REQUIRED:
SPECIAL TOOLS/EQUIPMENT REQUIRED:
NOTE:
An updated J1962 cable has been released. This cable has a red colored connector at the DRBIII(R) connection. Use this cable whenever a flash is being performed.
REPAIR PROCEDURE:
CAUTION:
The technician must replace the pis hose, install the pressure switch wiring harness, and flash the PCM before returning the vehicle to the customer.
REPLACE P/S HOSE AND INSTALL PRESSURE SWITCH WIRING HARNESS
1. Replace the Power Steering (P/S) pressure hose, p/n 05139026AA (4WD) or 05139025AA (2WD). Refer to the service information available in TechCONNECT or the appropriate service manual, Section 19, Pump, Hoses, Removal.
2. Disconnect the battery.
3. Install the wiring harness, p/n 05135710AA. The wiring harness should be routed along the bulkhead and tie wrapped to an existing wiring harness, to hold it in place (Fig. 1), (Fig. 2) and (Fig. 3).
4. When the wiring harness routing is completed, remove the excess tie strap material from all the tie straps.
5. Plug the wiring harness connector into the p/s switch mounted on the new p/s hose.
6. Attach the ground circuit (black wire with the eyelet) to the upper rear PCM mounting bracket bolt near the PCM C1 (Black) connector (Fig. 4).
7. Unplug the PCM C1 (Black) connector (Fig. 4).
8. Remove the PCM C1 connector back cover.
9. Remove the white plug from cavity 12.
10. Insert the green wire terminal into cavity 12 of the connector. Refer to the service information available in TechCONNECT or the appropriate service manual, Section 8W-01, Connector, Installation.
11. Install PCM C1 connector back cover
12. Plug the C1 connector into the PCM.
13. Attach the negative battery cable.
REPROGRAM THE PCM WITH UPDATED SOFTWARE
NOTE:
Whenever a controller is programmed, the software in the DRBIII(R), must be programmed with the latest revision level available.
NOTE:
If this flash process is interrupted/aborted, the flash should be restarted and then follow the directions on the DRBIII(R).
14. Before beginning the reprogramming procedure, remove any old flash reprogramming files from the DRBIII(R) memory. To clear the memory from the MAIN MENU power up the DRBIII(R) and then:
a. Simultaneously press the "MORE" and "YES" keys.
b. A screen will appear requesting a "COLD BOOT".
c. Follow the on screen instructions by selecting the "F4" key.
d. When the DRBIII(R) reboots to the MAIN MENU, proceed to (STEP # 15)
15. With the ignition switch in the "RUN" position, determine the original part number of the PCM currently in the vehicle. Using the DRBIII(R) select:
a. "DRBIII(R) Standalone"
b. "1998 - 2005 Diagnostics"
c. "All (Except Below)"
d. "Engine"
e. "Module Display"
f. Record the "PCM part # " on the repair order for later reference.
16. Connect the DRBIII(R) to TechCONNECT. Open TechTOOLS and verify that the "DRBIII(R)
Status: Connected" message is in the upper right corner of the TechTOOLS screen.
17. Enter the "PCM part # " recorded in (STEP # 15) in the "Parts Criteria" area and select "Show Updates". TechTOOLS will populate the appropriate calibration.
18. Select the calibration.
19. Select the "DRBIII(R)" radio button which is next to the "Download/Update" button.
20. Select the "Download/Update" button.
21. Monitor the "Flash Download/Update Progress" window on the TechCONNECT and follow the instructions on TechCONNECT. When the flash process is complete, proceed to (STEP # 22).
22. Disconnect the DRBIII(R) from TechCONNECT.
23. Open the hood, install a battery charger and verify battery state is above 12.5 volts.
24. Connect the DRBIII(R) to the vehicle.
25. Download the flash from the DRBIII(R) to the vehicle. Using the DRBIII(R) select:
a. "Vehicle Flash"
b. Follow the directions on the DRBIII(R) screen. When the flash process is complete, proceed to (STEP # 26).
NOTE:
Due to the PCM programming procedure, a DTC may be set in other modules (TCM, BCM, MIC, SKIM, etc.) within the vehicle, if so equipped. Some DTC's may cause the MIL to illuminate. Check all modules using "Module Scan", record the DTC's, and erase these DTC's prior to returning the vehicle to the customer. Erase any DTC's in the PCM only after all other modules have had their DTC's erased.
NOTE:
The following step is required by law.
26. Type the necessary information on the "Authorized Modification Label" p/n 04275086AB and attach near the VECI label (Fig. 5).
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
FAILURE CODE:
Disclaimer:
This bulletin is supplied as technical information only and is not an authorization for repair.