What does code P1358 mean?

Q: What does code P1358 mean?

Ignition Diagnostic Monitor Signal Out Of Self Test Range. P1358 on Mazda vehicles means the powertrain control module (PCM) has detected that the ignition diagnostic monitor (IDM) signal is outside its expected self-test range during the key-on engine-off self-check. The IDM circuit is how the PCM verifies that the ignition coil primary circuit is switching correctly, so this code points to a fault in that feedback path rather than a misfire or a dead coil.

DTC codes / Mazda codes / P1358

P1358 · MazdaIgnition Diagnostic Monitor Signal Out Of Self Test Range

P1358 on Mazda vehicles means the powertrain control module (PCM) has detected that the ignition diagnostic monitor (IDM) signal is outside its expected self-test range during the key-on engine-off self-check. The IDM circuit is how the PCM verifies that the ignition coil primary circuit is switching correctly, so this code points to a fault in that feedback path rather than a misfire or a dead coil.

SystemPowertrain

Code typeMazda specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Guidance is general and written for Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.