PCM - DTC P1631 Set

Bulletin No.: 021/97
Issued: 10/23/97
Revised:

Category
F

Applicable Model/s
1997 Protege (MTX)

Subject:
DTC P1631 WITH NO MIL ILLUMINATION

APPLICABLE MODELS
1997 Protege with Z5 (1.5L) engine, manual transaxle and a VIN of JM1BC14**V0111118 and lower.
1997 Protege with BP (1.8L) engine, manual transaxle and a VIN of JM1BC14**0131460 and lower.

DESCRIPTION
During routine diagnosis, Diagnostic Trouble Code (DTC) P1631 may be retrieved. PCM logic is designed to NOT illuminate the MIL when P1631 is stored in Powertrain Control Module (PCM). P1631 is stored in the PCM when alternator output is low or when the engine RPM drops due to improper clutch operation.
To prevent the PCM from storing the DTC mistakenly, the PCM logic has changed.

REPAIR PROCEDURE

1. Verify concern.
^ DTC 1631 and other DTC(s) are retrieved, refer to the workshop manual, repair, then proceed to step 2.
^ Only DTC 1631 is retrieved, proceed to step 2.

2. Allow the engine to Idle.

3. Check the "Charging System" warning light
^ If the warning light is illuminated, inspect the Charging System according to the instructions in the workshop manual and repair.
^ If the warning light is not illuminated, erase the DTC from memory. No repair, parts replacement or adjustment is necessary.





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