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TSB 25-003-01

Erroneous DTC P1398 (or $BA) - No Crank Sensor Learn

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Date: Feb. 23, 2001

Models: 1996-1997 BR/BE Ram Truck with gas engine

1996-1997 (AB) Ram Van
1996-1997 (AN) Dakota
1996-1997 (BR/BE) Ram Truck
1997 (TJ) Wrangler
1996-1997 (XJ) Cherokee
1996-1997 (ZJ) Grand Cherokee

NOTE: THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A GASOLINE ENGINE.

Discussion:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (calibration level 96Call8 or 97Call8).

Symptoms:
A customer may experience a MIL (Check Engine Lamp) illumination due to an erroneous DTC Pl398 - No Crank Sensor Learn. This DTC may also be displayed as a $BA - Adaptive Numerator at Limit. This condition may be caused by a momentary drop in the supply voltage to the powertrain control module.

This condition may occur when a normal, or higher, electrical load is applied to the battery. A momentary drop in the supply voltage to the PCM may be caused by a marginal battery or poor electrical connections from the battery to the PCM. The condition may be further aggravated by cold ambient temperatures or when the vehicle has been left unused for an extended period of time.

Diagnosis: 

1. Verify the calibration level of the PCM software. If the PCM software is at 96Call 8 or 97Call8, or higher, then this TSB does not apply. Further diagnosis is required.

2. If PCM software is earlier (lower or less) than either 96Call8 or 97Cail8, then perform the Repair Procedure.

Parts Required:
1 04669020 Label,   Authorized Software Update
1 04275086 Authorized Modification

Equipment Required:
CH6000 Scan Tool   (DRB III)
CH7035 General Purpose Interface Bus Cable (GPIB)
CH7000/7001 J1962 Cable
  MDS2 (Mopar Diagnostic System)

NOTE. THE MDS2 SYSTEM MUST BE OPERATING AT THE RESPECTIVE CIS CD 2077 OR HIGHER.

Repair: 

1.    Reprogram the PCM using the MDS2 (Mopar Diagnostic System) and DRB III (Scan Tool).

NOTE: DUE TO THE PCM REPROGRAMMING PROCEDURE, A DTC MAY BE SET IN OTHER MODULES (TCM, 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 THE MODULE THAT IS BEING REPROGRAMMED. CHECK ALL MODULES, RECORD THE FAULTS, AND ERASE THESE FAULTS PRIOR TO RETURNING THE VEHICLE TO THE CUSTOMER. ERASE ANY FAULTS IN THE PCM ONLY 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 (Figure 1). Attach the label to the JTEC PCM and cover the label with the clear plastic overlay.

3.  Type or print the following information on the Authorized Modification Label and attach the label near the VECI label (Fig 2).

Notes: 

Policy:    Reimbursable within the provisions of the warranty.

Time Allowance:
Labor Operation No:  08-19-46-93 (Reprogram PCM) ...................................0.5 Hrs.

Failure Code:  FM - Flash Module


Thanks to Bob Bergevin for supplying this TSB information

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This page was edited on: May 3, 2004