DTC P2308-00; Ion Sensor No. 3 Circuit Problem: Notes

DTC DETECTION DESCRIPTION

DTC P2308:00	Ion sensor No. 3 circuit problem
DETECTION CONDITION	After the engine is started, when the engine speed is 2, 000 rpm or less, the signal input to the PCM from ion sensor No. 3 is in error. Diagnostic support note This is a continuous monitor (other). The check engine light does not illuminate. FREEZE FRAME DATA is not available. Snapshot data is available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Not applicable
POSSIBLE CAUSE	Cylinder No. 3 misfire Ignition coil/ion sensor No. 3 connector or terminals malfunction Short to ground or open circuit in ion sensor No. 3 power supply circuit Short to ground in wiring harness between ENGINE2 15 A fuse and ignition coil/ion sensor No. 3 terminal A ENGINE2 15 A fuse malfunction Open circuit in wiring harness between main relay terminal C and ignition coil/ion sensor No. 3 terminal A Open circuit in wiring harness between ignition coil/ion sensor No. 3 terminal D and body ground Short to ground in wiring harness between ignition coil/ion sensor No. 3 terminal C and PCM terminal 1BA PCM connector or terminals malfunction Short to power supply in wiring harness between ignition coil/ion sensor No. 3 terminal C and PCM terminal 1BA Open circuit in wiring harness between ignition coil/ion sensor No. 3 terminal C and PCM terminal 1BA Ion sensor No. 3 malfunction PCM malfunction

Fig 1: ION Sensor No 3 Circuit Diagram

Courtesy of MAZDA MOTORS CORP.