Engine Controls - Engine Spark Knock on Acceleration
NUMBER: 18-026-02 REV. AGROUP: Vehicle Performance
DATE: Oct. 28, 2002
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-026-02, DATED SEPTEMBER 2, 2002, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE AN ADDITIONAL MODEL YEAR, ADDITIONAL PART NUMBERS, AND REVISED PROCEDURES.
SUBJECT:
Engine Spark Knock
OVERVIEW:
This bulletin involves replacing the Powertrain Control Module (PCM).
MODELS:
2001 **2002** (RS) Town & Country/Caravan/Voyager
NOTE:
THIS INFORMATION APPLIES TO VEHICLES EQUIPPED WITH A 3.3L ENGINE (SALES CODE EGA OR EGM)
SYMPTOM/CONDITION:
Severe audible spark knock under heavy acceleration, most prevalent in ambient temperatures above 27°C (80°F).
DIAGNOSIS:
Using the Diagnostic Scan Tool (DRB III(R)) with the appropriate Diagnostic Procedures Manual, verify all engine systems are functioning as designed. If DTC's are present, record them on the repair order and repair as necessary before proceeding further with this bulletin. Thorough and complete diagnosis must be performed on the vehicle and all other sources of mechanical noise must be ruled out and/or corrected before considering a PCM replacement.
NOTE:
INSTALLATION OF THESE PCM'S ON VEHICLES THAT DO NOT EXHIBIT AUDIBLE SPARK KNOCK MAY AFFECT ENGINE PERFORMANCE AND/OR FUEL ECONOMY.
PARTS REQUIRED
EQUIPMENT REQUIRED
REPAIR PROCEDURE:
1. **Replace PCM with the appropriate part number from parts chart shown above, using the procedures outlined in the appropriate RS Service Manual in section 8E or the service information available in the MDS2.**
NOTE:
THE FOLLOWING STEPS ARE REQUIRED BY LAW.
2. Type the necessary information on the "Authorized Modification Label" p/n 04275086AB and attach the label near the VECI label (Fig. 1)
3. **Perform the Powertrain Verification Test VER-2 as outlined in the appropriate Powertrain Diagnostic Procedures or the service information available in the MDS2.**
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE
FAILURE CODE