PCM - Exhaust Backfire/Popping Sound
NO: 18-17-94GROUP: Vehicle Performance
DATE: Sep. 2, 1994
SUBJECT:
Exhaust Backfire
MODELS:
1994 - 1995 (AN) Dakota/Dakota Cab & Chassis
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 3.9L ENGINE AND MANUAL TRANSMISSION.
SYMPTOM/CONDITION:
Exhaust backfire or popping sound in the exhaust system during a closed throttle deceleration before the engine has reached normal operating temperature.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRB II or III), verify that all engine/transmission systems are functioning as designed. If Diagnostic Troubles Codes (DTC's) are present, record them on the repair order for future reference, and repair as necessary.
1. Allow the vehicle engine to cool down for at least six to eight hours.
2. Start the engine and accelerate in first gear until the engine speed reaches approximately 3,000 RPM'S.
3. Remove foot from the accelerator pedal. Decelerate the vehicle and allow the vehicle to come to a stop.
4. If a backfire or popping sound is heard from the exhaust system, perform the repair procedure below.
PARTS REQUIRED:
1 56028729 Power Control Module, 3.9L Manual Transmission (RFI)
REPAIR PROCEDURE:
This bulletin involves the replacement of the Powertrain Control Module (PCM).
1. Disconnect the negative cable from the battery.
2. Replace the PCM.
3. Connect the negative battery cable.
NOTE:
THE FOLLOWING STEP IS REQUIRED BY LAW.
4. Type the necessary information on the Authorization Modification Label, and attach the label near the VECI Label.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 08-19-01-91 0.6 Hrs.
FAILURE CODE: AM - Authorized Modification