Engine Controls - MIL ON/DTCs P2181/P0139/P0159
NUMBER 18-024-11GROUP: Vehicle Performance
DATE: May 14, 2011
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 11.03 OR HIGHER TO PERFORM THIS PROCEDURE.
SUBJECT:
Flash: MIL Illumination And Cruise Switch Inoperative And Idle Buffeting Condition
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software.
MODELS:
2008-2011 (JK) Wrangler
NOTE:
This bulletin applies to vehicles equipped with a 3.8L engine (sales code EGT) built before March 27, 2011 (MDH 0327XX).
SYMPTOM/CONDITION:
The customer may experience a MIL illumination when no problem exists. Upon further investigation the Technician may find any of the following Diagnostic Trouble Codes (DIG) active or stored:
a. P2181 - Cooling System Performance (2008 through 2011 models)
b. P0139 - 02 Sensor 1/2 Slow Response (2011 models)
c. P0159 - 02 Sensor 2/2 Slow Response (2011 models)
On 2011 models, the cruise control ON switch may appear inoperative when attempting to turn the cruise system on. The software could potentially mature DTC, P0591 - Speed Control Switch 2 Performance (which does not cause MIL illumination). The customer complaint will be that the cruise control did not turn on or that cruise control turned off inadvertently, but functioned as expected during the next key cycle.
On 2011 2 - door Wrangler's models, the customer may also experience a condition known as "Idle Buffeting while the vehicle is idling. This condition can be similar to driving a 4 door model down the road with one rear window down and all others rolled up, causing a thumping or buffeting sound.
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. If DTC's are present other then 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:
Install a battery charger to ensure battery voltage does not drop below 13.2 volts. Do not allow the charging voltage to climb above 13.5 volts during the flash process.
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.
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.