PCM - Engine Spark Knock Under Load
NUMBER: 18-006-01 REV AGROUP: Vehicle Performance
DATE: Mar. 02, 2001
THIS BULLETIN SUPERCEDES TECHNICAL SERVICE BULLETIN 18-006-01, DATED FEB. 23, 2001, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS**. THIS LATEST REVISION INCLUDES ADDITIONAL EMISSIONS PACKAGES.
SUBJECT:
2001 M.Y. Engine Spark Knock
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (calibration level 01Cal1ED, 01Cal13, or 01Cal14)
MODELS:
2001 (AB) Ram Van
2001 (BR/BE) Ram Truck
2001 (DN) Durango
NOTE:
THIS BULLETIN APPLIES TO VEHICLES WITH PCM SOFTWARE THAT IS EARLIER (LESS OR LOWER) THAN THE CALIBRATIONS LISTED IN THE TABLE SHOWN. REFER TO THE TWO TABLES FOR SPECIFIC APPLICATIONS AND EXCLUSIONS.
NOTE:
THE FOLLOWING EMISSION PACKAGES ARE NOT APPROVED AND ARE EXCLUDED FROM THIS BULLETIN. THE PCM CALIBRATION OF ANY EXCLUDED VEHICLE IS NOT TO BE REPROGRAMMED FOR A SPARK KNOCK COMPLAINT. BEFORE ATTEMPTING A REPROGRAMMING SESSION INSPECT THE TYPE VEHICLE AND ENGINE FOR POSSIBLE EXCLUSION. SEE TABLE AS SHOWN.
SYMPTOM/CONDITION:
Some vehicle engines may exhibit a light-to-moderate spark knock condition during acceleration (under load).
DIAGNOSIS:
1. Verify that the above tables and the following NOTE(S) have been reviewed and understood.
2. Verify the calibration level of the PCM.
3. Verify that the engine coolant contains a quality antifreeze. The coolant mixture should consist of 44% to 68% antifreeze.
4. If the only condition seen is the light-to-moderate engine spark knock and the PCM calibration is earlier (less or lower) than the calibrations listed in the table above, then perform the Repair Procedure.
NOTE:
WHEN PULLING A HEAVY LOAD OR DRIVING A FULLY LOADED VEHICLE USE A PREMIUM UNLEADED FUEL TO HELP MINIMIZE SPARK KNOCK.
PARTS REQUIRED:
EQUIPMENT REQUIRED:
NOTE:
THE MDS2 SYSTEM MUST BE OPERATING AT THE RESPECTIVE CIS CD LEVEL AS LISTED ABOVE IN THE FIRST TABLE.
REPAIR PROCEDURE:
1. Reprogram the PCM using the MDS2 (Mopar Diagnostic System) - and the DRB III(R) (Scan Tool).
NOTE:
DUE TO THE PCM REPROGRAMMING PROCEDURE, A DTC MAY BE SET IN OTHER MODULES (EATX, BCM, MIC, SKIM, ETC.) WITHIN THE VEHICLE, IF SO EQUIPPED. SOME DTC'S MAY CAUSE THE MIL TO ILLUMINATE. ALL DTC'S RELATE TO A LOSS OF COMMUNICATIONS WITH A MODULE. CHECK ALL MODULES, RECORD THE FAULTS, AND ERASE THESE FAULTS PRIOR TO RETURNING THE VEHICLE TO THE CUSTOMER. ERASE ANY FAULTS IN THE PCM LAST, AFTER ALL OTHER MODULES HAVE HAD THEIR FAULTS ERASED.
NOTE:
THE FOLLOWING STEPS ARE REQUIRED BY LAW.
2. Type the necessary information on the "Authorized Software Update Label" p/n 04669020 (Fig. 1). Attach the label to the PCM and cover the label with the clear plastic overlay.
3. Type the necessary information on the "Authorized Modification Label" p/n 04275086 and attach the label near the VECI label (Fig. 2).
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
FAILURE CODE: