PCM - Rough Engine Idle After Cold Start
NO: 18-08-94GROUP: Vehicle Performance
DATE: Jun. 24, 1994
1994 MODEL EFFECTIVE DATE: Jul. 15, 1994
SUBJECT:
Idle Roughness After Cold Start
THIS BULLETIN SUPERSEDES, IN PART, TECHNICAL SERVICE BULLETIN NO. 09-06-93 DATED MAY 14, 1993. THE DRIVEABILITY INFORMATION FROM 09-06-93 IS INCLUDED WITH THIS BULLETIN TO PROVIDE A SINGLE SOURCE FOR 2.2L & 2.5L ENGINE COLD PERFORMANCE INFORMATION.
MODELS:
1992 - 1993 (AA) Acclaim/Spirit/LeBaron Sedan
1992 - 1993 (AC) Dynasty
1992 - 1993 (AG) Daytona
1992 - 1993 (AJ) LeBaron Coupe/LeBaron Convertible
1992 - 1994 (AP) Sundance/Shadow/Shadow Convertible
1992 - 1993 (AS) Caravan/Voyager
NOTE:
THIS BULLETIN APPLIES TO 1992 & 1993 VEHICLES EQUIPPED WITH THE 2.5L ENGINE, ALSO 1992, 1993 AND 1994 VEHICLES EQUIPPED WITH THE 2.2L ENGINE.
SYMPTOM/CONDITION:
Cold idle roughness (condition worse if engine speed is increased in neutral) and poor driveability, after a cold start, in 0 to 30 degree fahrenheit temperatures. Condition lasts until the engine coolant temperature reaches approximately 50 to 60 degrees fahrenheit.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRBII or III) with the appropriate Diagnostic Procedure Manual, verify that all engine/transmission systems are functioning as designed. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order for future reference and repair as necessary. If no codes are present and all systems are functioning correctly, proceed with the repair.
PARTS REQUIRED:
REPAIR PROCEDURE FOR 1992 AND 1993 MODEL YEAR VEHICLES:
This repair involves replacing the Powertrain Control Module with a revised part on the 1992 and 1993 model year vehicles.
1992 MODEL YEAR VEHICLES ONLY
1. Inspect the intake manifold for a raised "X" cast into the number 1 runner. The "X" is located under the letter "F" in the words "FIRING ORDER" on the top of the number 1 intake runner. Intake manifolds that DO NOT have an "X" should be replaced using the procedure outlined in the appropriate Service Manual.
1992 AND 1993 MODEL YEAR VEHICLES
2. Using the procedure outlined in the appropriate Service Manual, replace the Powertrain Control Module.
IMPORTANT:
THE NEXT STEP IS REQUIRED BY LAW.
3. Type the required information on the Authorized Modification Label as shown and attach near the VECI Label.
REPAIR PROCEDURE FOR 1994 MODEL YEAR VEHICLES
PCM (Powertrain Control Module) RE-PROGRAMMING
This repair involves selectively erasing and reprogramming the PCM with new software (calibrations) for the 1994 model year vehicles.
EQUIPMENT/PARTS REQUIRED:
1 CH1000 Scan Tool (DRBII)
1 CH3502 Flash Programming Cartridge
1 CC2000 Standard Engine Diagnostic Cable
1 CH1500 Flash Programming Adapter
1 4669020 Authorized Software Update Label
1 4275086 Authorized Modification Label
MULTI-PART NUMBER FLASH RE-PROGRAMMING INSTRUCTIONS
1. Insert the Flash Programming Cartridge into the DRBII.
2. Connect the DRBII to the Flash Programming Adapter.
3. Connect the Flash Programming Adapter to the engine 6-Way Cable.
4. Connect the engine 6-Way Cable to the engine Diagnostic Connector.
5. Connect the engine 6-Way Cable Red Battery Clip to the positive terminal of the vehicle battery.
6. Turn the vehicle ignition on.
7. The DRBII will power up and prompt through the sequence of windows shown:
8. When the update is complete, turn the vehicle ignition off.
If an error happens, write down the error message (off the Scan Tool Screen). Then press MODE and ATM keys together on the Scan Tool to retry (reboot). The under hood temperature during programming must be between (minus) -40 degrees F (-40 degrees C) and +185 degrees F (+85 degrees C).
IMPORTANT:
THE NEXT STEPS ARE REQUIRED BY LAW.
9. Type the necessary information on the "Authorized Software Update Label" and attach to the PCM.
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:
09-50-01-92 Intake Manifold Replace 1992 AA, AC, AG, AJ, AP, AS 2.2 Hrs.
09-50-01-66 Powersteering equipped 0.4 Hrs.
Failure Code: P8 - New Part
08-19-01-92 Powertrain Control Module Replace
1992 -1993 AA, AC, AG, AJ, AP 0.5 Hrs.
Failure Code: AM - Authorized Modification
08-19-40-98 Powertrain Control Module Reprogramming
1994 AP
0.3 Hrs.
Failure Code: FM - Flash Module