Ignition Diagnostic Monitor Signal Lost
2003-2003 Mazda B2300 2.3L I4
The 2003 Mazda B2300 is equipped with a 2.3L inline-4 engine. Below you'll find detailed p1351 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
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
- Test ignition module output signal
- Inspect wiring from ignition system to PCM
- Check ignition coil primary and secondary resistance
- Test for spark at each cylinder
- Verify PCM receives IGF signal
Repair Notes
Replace the ignition module or coil pack if the diagnostic monitor signal is absent.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1351 on Other Vehicles
Common Questions
What does code P1351 mean on a 2003-2003 Mazda B2300?
P1351 stands for "Ignition Diagnostic Monitor Signal Lost". 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.
What are the symptoms of P1351 on a Mazda B2300?
Common symptoms of P1351 include: Check Engine Light, Engine may not start, Engine stalls, Rough running, Misfires on multiple cylinders.
What causes P1351 on a 2003-2003 Mazda B2300?
Common causes of P1351 include: Faulty ignition module, Damaged wiring between ignition system and PCM, Failed ignition coil pack, Corroded ignition system connector, PCM IGF input circuit fault.
Last updated: March 2026