Auto Repairing 2000 Honda Accord MIL Comes On With DTC P0128 or DTC P1486
SYMPTOM The MIL is on with DTC P0128 (thermostat range/ performance problem) or DTC P1486 (cooling systemmalfunction). PROBABLE CAUSE The ECM/PCM calculates an anticipated engine coolant temperature (ECT) during cold start. If the anticipated temperature is significantly higher than the actual ECT reading, DTC P0128 or P1486 will be set. However, some very specific driving/ambient temperature conditions can cause the ECM/PCM to set DTC P0128 or P1486 when there isn’t a problem with the vehicle. CORRECTIVE ACTION Replace the ECM/PCM. The replacement ECM/PCMs have revised software. DIAGNOSIS Connect the Honda Diagnostic System (HDS) to the DLC (data link connector), and check for DTCs.
• If DTC P0128 or DTC P1486 is stored, go to REPAIR PROCEDURE. • If another DTC is stored, go to the appropriate troubleshooting procedure in the service manual. REPAIR PROCEDURE 1. Write down the part number of the current ECM/ PCM. The part number is on the label at the front of the ECM/PCM. 2. Match the part number you wrote down with the current ECM/PCM part number listed under PARTS INFORMATION, then get the correct replacement ECM/PCM. 3. Download the immobilizer key transponder codes from the PCM to the HDS. Refer to REPLACING THE ECM/PCM in service bulletin 00-049, Immobilizer System (Type 2). 4. Remove the ECM/PCM. 37820-PAA-L75
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