PCM - Idle Shake/Hesitation/MIL ON/DTC $77 Set: Overview

NO: 18-31-96

GROUP: Performance

DATE: Nov. 8, 1996

SUBJECT:
Idle Shake, Sag, Hesitation, Diagnostic Trouble Code (DTC) $77 - Fuel System Lean

NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH 2.5L ENGINES.

MODELS:

1996 (AN) Dakota
1996 (XJ) Cherokee
1997 (TJ) Wrangler

SYMPTOM/CONDITION:

MIL light may illuminate setting Diagnostic Trouble Code (DTC) $77 (fuel system lean) when diagnostics are performed. The vehicle may exhibit a cold engine idle shake, sag or hesitation with or without the trouble code.

DIAGNOSIS:

Using the Mopar Diagnostic System (MDS) or the Diagnostic Scan Tool (DRB III) with the appropriate Diagnostic Procedures Manual, verify all engine/transmission/speed control systems are functioning as designed. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order and repair as necessary before proceeding further with this bulletin. If no DTC's or those listed above are present and any of the above symptoms have been experienced, perform the Repair Procedure.

PARTS/EQUIPMENT REQUIRED:

1 CH6OOO Scan Tool (DRB III)
1 CH7O35 General Purpose Interface Bus Cable (GPIB)
1 CH7OOO J1962 Cable
1 04669020 Label - Authorized Software Update
1 04275086 Label - Authorized Modification
1 04883378 Fuel Rail Kit

NOTE:
THE MDS AND DRB III ARE REQUIRED TO PERFORM THIS REPAIR AND THE SYSTEM MUST BE OPERATING WITH RELEASE 20 OR HIGHER AND TIL CD RELEASE 1119 OR HIGHER MUST BE INSTALLED.

POLICY: Reimbursable within the provisions of the warranty.

TIME ALLOWANCE:

Labor Operation No: 14-70-14-94 0.5 Hrs.
Replace fuel rail & install vacuum fitting.

08-19-46-96 0.5 Hrs.
Reprogram Power Train Control Module.

FAILURE CODE: FM - Flash Module