FixVault
Home › Mazda › 2002 › B4000 Base, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P1309: Misfire Detection Monitor › Diagnostic Procedures

Diagnostic Procedures

  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed, go to next step.

  2. Check CMP Sensor Output

    Disconnect PCM connector. Install breakout box, leaving PCM connector. Start engine and vary engine RPM. Measure AC voltage between breakout box terminals No. 85 (CMP circuit) and 103 (PWR GND circuit). If AC voltage varies more than 0.1 volt, verify correct sensor installation. If CMP sensor is properly installed, replace faulty PCM. Go to next step.

  3. Verify Trouble Shooting Of DTCs Completed

    Reconnect all electrical connectors. Using scan tool, clear DTC memory. Perform FUEL OR MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE  in MONITOR REPAIR VERIFICATION DRIVE CYCLES under DRIVE CYCLE PROCEDURES. Using scan tool, retrieve DTCs. If same DTC is present, replace faulty PCM and repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTCs are set, trouble shooting is complete.
About FixVault