PCM - DTC 31 EVAP Purge Flow Monitor Failure
NO: 18-02-95GROUP: Vehicle Performance
EFFECTIVE DATE: Feb. 3, 1995
SUBJECT:
Check Engine Light On "Evap Purge Flow Monitor Failure" - Flash Code 31
MODELS:
1995 (FJ) Avenger/Sebring/Talon
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 2.0L DOHC NON-TURBO ENGINE AND MANUAL TRANSAXLE BUILT ON OR AFTER SEP. 10, 1994 (MDH 09-10-XX) WITH POWERTRAIN CONTROL MODULE PIN 5269653 OR 5269656, OR ON VEHICLES BUILT FROM JUN. 16, 1994 TO SEP. 10, 1994 AND HAD THE PCM REPLACED USING BULLETIN 18-21-94.
SYMPTOM/CONDITION:
Check Engine Light is on, Diagnostic Trouble Code "Evap Purge Flow Monitor Failure" and/or Flash Code 31 is set in the absence of a short or open in the solenoid circuit.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRBIII) and the appropriate Diagnostic Procedure Manual, verify that all engine systems are functioning correctly. If Diagnostic Trouble Codes (DTC's) other than 31 are present, record them on the repair order for future reference and repair as necessary.
Verify that the Purge System is functioning properly. Disconnect the purge solenoid hose at the vapor canister. The line should be free of carbon pellets (a light amount of dust is normal). Start the engine. After about 90 seconds, the Duty Cycle Purge Valve should start to cycle. At the open end of the hose, one should feel a steady stream of brief vacuum pulses in response to the pulsing of the valve. This is normal and the purge system is functioning properly. If only code 31 is present, proceed with the following repair.
EQUIPMENT/PARTS REQUIRED:
1 CH6000 Scan Tool (DRB III)
1 CH7035 General Purpose Interface Bus Cable (GPIB)
1 CH7010 J1962/MMC 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 with new software (calibration change).
NOTE:
MDS AND DRBIII ARE REQUIRED TO PERFORM THE FOLLOWING REPAIR. MDS MUST BE OPERATING WITH RELEASE 16 OR HIGHER INSTALLED.
1. Connect the MDS (Mopar Diagnostic System) and DRB III (Scan Tool) to the vehicle 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 CONTROLLER PROGRAMMING on the MDS, then press NEXT MENU.
5. Use the arrow keys and select PROGRAM CONTROLLER PART on the MDS, then press NEXT MENU.
6. Follow the steps presented on the MDS and DRBIII which will allow the DR8lll to obtain the current part number of the controller.
7. The MDS will display the part number of the controller on the vehicle and the appropriate replacement part number, then press NEXT MENU to begin programming.
If the controller on the vehicle has already been updated or programmed, a NO UPDATES AVAILABLE message will be displayed. Check the part number of the controller on the vehicle and compare it to the part number displayed. If the controller has already been updated, proceed to step 9.
8. The MDS and DRB III will prompt the operator for any 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 the clear plastic overlay.
10. Type the necessary information on the Authorized Modification Label and attach the label near the VECI Label.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 08-19-41-94 0.5 Hrs.
FAILURE CODE: FM - Flash Module