Chapter A: General Diagnosis
3
Most manufacturers also provide some type of Diag-
nostic Manual for the vehicle or vehicle family. Typically
these manuals are for specific automotive systems such
as electrical, fuel injection, and emissions/performance.
Technical
Service
Bulletin
SUBJECT:
Sags/Hesitation/Stumble/Start & Stall
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control
Module (PCM) with new software (calibration changes).
MODELS:
2003 Minivan and Truck
NOTE: THIS INFORMATION APPLIES TO VEHICLES EQUIPPED WITH A 3.34L ENGINE.
SYMPTOM/CONDITION:
Sags/Hesitation/Stumble or Start & Stall after a cold start in ambient temperatures of -7° -
30° C (20° - 86° F). The sag/hesitation or stumble may persist for up to a minute into a
drive cycle
and is attributed to high driveability index (Dl) fuel.
DIAGNOSIS:
Using the Diagnostic System and or a Diagnostic Scan Tool with the appropriate Diagnostic
Procedures Manual, verify all engine/transmission
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 are present and the customer
has described the above symptoms,
perform the Repair Procedure.
NOTE: WHENEVER A POWERTRAIN CONTROL MODULE (PCM) IS REPLACED
DUE TO FAILURE, THE SOFTWARE OF THE REPLACEMENT CONTROLLER
MUST BE VERIFIED FOR THE LATEST REVISION LEVEL. USE THE FLASH
PROCEDURE TO UPDATE REPLACED CONTROLLERS AS NECESSARY.
PARTS REQUIRED:
1 14465020 Label, Authorized Software Update
1 54266086 Label, Authorized Modification
Fig. 1-1.
Typical TSB.
Every vehicle has a specific Service Manual. These-
manuals contain general service information, and often
specific diagnostic and troubleshooting procedures for
each system within the vehicle, such as the emission or
fuel system.
Summary of Contents for ASE-A8
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