Engine Controls - ECM Reprogramming Recommendations
Information IB03-14-S002Reprogramming of Powertrain Control Modules ([1][2]PCM)
ISSUE DATE: FEBRUARY 2003
Affected Vehicles
All Isuzu Vehicles.
Service Information
American Isuzu Motors Inc. continually strives to provide the most technically advanced vehicles possible to meet the ever-increasing demands of the SUV market place. One such area of constant change is the calibrations used within the vehicles Powertrain Control Module (PCM). These changes are made as a part of on going product improvements and may take place at anytime including during mid-year production.
WHEN SHOULD A [1][2]PCM CALIBRATION BE UPDATED?
Emission Related - Anytime Isuzu determines that a vehicle's calibration may cause emissions non-conformity, Isuzu will release a campaign bulletin. Vehicle owners and dealership personnel will be notified of the campaign. If re-programming is required, all vehicles listed as affected in the campaign bulletin should have the [1][2]PCM programmed with the updated calibration.
Symptom Related - Some vehicles operated under certain conditions may exhibit symptoms that lead to a customer concern. Information relating to symptoms that may be affected by an updated calibration can be found in the comment section of the calibration selection tables. Vehicles should be diagnosed using the symptom description diagnostic tables first, repaired and verified. If (after repairs are completed and verified) the customer's symptom closely match a symptom listed in the comment section of a calibration table for the vehicle, the [1][2]PCM should be programmed with the updated calibration. All diagnostics, symptoms, Diagnostic Trouble Codes, and broadcast codes must be documented on the dealership repair order.
(Reference Section 14 Service Policy and Procedure manual)
Diagnostic Trouble Code (DTC) Related - Some vehicles operated under certain conditions may illuminate the Malfunction Indicator Light (MIL). Information relating to DTC's that may be affected by an updated calibration can be found in the comment section of the calibration selection tables. Vehicles should be diagnosed using the DTC diagnostic tables first, repaired and verified. If (after repairs are completed and verified) the customers DTC match a DTC listed in the comment section of a calibration table for the vehicle, the [1][2]PCM should be programmed with the updated calibration. All diagnostics, symptoms, Diagnostic Trouble Codes and broadcast codes must be documented on the dealership repair order. (Reference Section 14 Service Policy and Procedure manual)
Technical Service Bulletin (TSB) - Anytime when performing the operations listed in a TSB and you are directed to program with an updated calibration.
WHEN SHOULD A [1][2]PCM CALIBRATION NOT BE UPDATED?
No Problem Found (NPF) - Unless specifically directed by an Isuzu Service Bulletin, a [1][2]PCM should not be programmed with an updated calibration before repairs have been diagnosed, repaired and verified.
Vehicle is found not to have the latest calibration available - Do not reprogram a [1][2]PCM with an updated calibration under warranty solely because a later version is available. Do not assume all vehicle operators will benefit from changes made in later calibration releases. Beginning with the 2000 model year lsuzu PCM's have an adaptive learning function. During the "learning" cycle, engine performance and transmission shift characteristics will be altered that could lead to customer complaints. Programming a PCM with an updated calibration is warrantable only as a result of a failure as listed above. Isuzu does not warrant that vehicles will be provided product improvements made after manufacture.
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