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2005 MAZDA MAZDA3
2.0L I4•FWD•AUTOMATIC•gas
3 active safety recalls on this vehicle — view recalls
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Repairs0Labor494Torque3333Fluid7DTC1016Battery1Maintenance0Recalls3
P1351high severityPowertrain

Ignition Diagnostic Monitor Signal Lost

on 2005 Mazda Mazda3 2.0L I4 · FWD

What this code means

The PCM has lost the ignition diagnostic monitor signal. The ignition system is not providing a confirmation signal back to the PCM that the ignition events are occurring as commanded.

Symptoms

  • Check Engine Light
  • Engine may not start
  • Engine stalls
  • Rough running
  • Misfires on multiple cylinders

Common causes

  • Faulty ignition module
  • Damaged wiring between ignition system and PCM
  • Failed ignition coil pack
  • Corroded ignition system connector
  • PCM IGF input circuit fault

Diagnostic steps

  1. Test ignition module output signal
  2. Inspect wiring from ignition system to PCM
  3. Check ignition coil primary and secondary resistance
  4. Test for spark at each cylinder
  5. Verify PCM receives IGF signal

Repair notes

Replace the ignition module or coil pack if the diagnostic monitor signal is absent.

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