Engine Controls - MIL ON/DTC P0128 Stored In Memory
NUMBER: 18-006-11 REV. AGROUP: Vehicle Performance
DATE: February 26, 2011
THIS BULLETIN SUPERSEDES SERVICE BULLETIN 18-006-11, DATED FEBRUARY 8, 2011, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE ADDITIONAL VEHICLE MODELS.
HELP USING THE wiTECH DIAGNOSTIC APPLICATION FOR FLASHING AN ECU IS AVAILABLE BY SELECTING "HELP" THEN "HELP CONTENTS" AT THE TOP OF THE wiTECH DIAGNOSTIC APPLICATION WINDOW.
THE wiTECH SOFTWARE LEVEL MUST BE AT RELEASE 11.02 OR HIGHER TO PERFORM THIS PROCEDURE.
SUBJECT:
Flash: MIL Illumination for P0128 - Thermostat Rationality Or Long Crank Times
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software.
MODELS:
2011 (JC) Journey
**2011 (JS) 200/Avenger**
**2011 (RT) Caravan/Town & Country**
NOTE:
This bulletin applies to RT vehicles equipped with a 3.6L engine with (sales code ERB) and a 62TE Automatic Transmission (sales code DG2) built before January 27, 2011 (MDH 0127XX).
NOTE:
**This bulletin applies to JC vehicles equipped with a 3.6L engine with (sales code ERB) and a 62TE Automatic Transmission (sales code DG2) built before February 2, 2011 (MDH 0202XX).**
NOTE:
**This bulletin applies to JS vehicles equipped with a 3.6L engine with (sales code ERB) and a 62TE Automatic Transmission (sales code DG2) built before February 1, 2011 (MDH 0201XX).**
SYMPTOM/CONDITION:
The customer may experience any of the following:
MIL Illumination
The Technician may discover that P0128 - Thermostat Rationality DTC is present
This DTC is a two trip code and is matured if a significant difference exists between the PCM predicted and actual engine coolant temperature during engine warm-ups.
The PCM calibration may improperly mature a P0128 DTC because the airflow across the coolant temperature sensor during colder ambient temperatures, 50° F (10° C) or below causes the predicted coolant temperature to deviate from the actual coolant temperature.
Long Crank Times
Long crank times could be experienced when the coolant temperature is less than 131° F (55° C) and the engine has been shut off for 7 minutes or less.
Updating the PCM software will correct the conditions listed above.
DIAGNOSIS:
Using a Scan Tool (wiTECH(TM)) with the appropriate Diagnostic Procedures available in TechCONNECT, verify all engine and transmission systems are functioning as designed. Low coolant levels, stuck open thermostats or blockage can mature this DTC also. Verify that these conditions are not present. If DTC's are present other than the one listed above record them on the repair order and repair as necessary before proceeding further with this bulletin.
If the above condition is present, perform the Repair Procedure.
PARTS REQUIRED:
REPAIR PROCEDURE:
NOTE:
If this flash process is interrupted/aborted, the flash should be restarted.
1. Reprogram the PCM with the latest software. Follow the detailed service procedures available in DealerCONNECT/TechCONNECT, Refer To Group 8 - Electrical > Electronic Control Modules - Service Information > Module - Powertrain Control > Standard Procedures > PCM/ECM Programming - Gas. After PCM reprogramming, the following must be performed:
a. Clear any DTC's that may have been set in other modules due to reprogramming. The wiTECH application will automatically present all DTCs after the flash and allow the tech to clear them.
b. On 621E equipped vehicles clear the Variable Line Pressure (VLP) Counters, found in the Misc Function menu for the PCM ECU.
c. Perform the Quick Learn function, found in the Misc Function menu for the TCM ECU.
2. Type the necessary information on the "Authorized Modification Label" and attach it near the VECI label.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
FAILURE CODE:
Disclaimer:
This bulletin is supplied as technical information only and is not an authorization for repair.