TSB: F021/97

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**V0131460 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.
2. Allow the engine to Idle.
3. Check the Charging System warning light.

Copyright © Mazda North American Operations