DTC P2311-00: Ion Sensor No. 4 Circuit Problem: Notes

DTC P2311:00	Ion sensor No. 4 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. 4 is in error. Diagnostic support note This is a continuous monitor (other). The check engine light does not illuminate. FREEZE FRAME DATA (Mode 2) is not available. Snapshot data is available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Not applicable
POSSIBLE CAUSE	Cylinder No. 4 misfire Ignition coil/ion sensor No. 4 connector or terminals malfunction Short to ground or open circuit in ion sensor No. 4 power supply circuit Short to ground in wiring harness between ENGINE2 15 A fuse and ignition coil/ion sensor No. 4 terminal A ENGINE2 15 A fuse malfunction Open circuit in wiring harness between main relay terminal D and ignition coil/ion sensor No. 4 terminal A Open circuit in wiring harness between ignition coil/ion sensor No. 4 terminal D and body ground Short to ground in wiring harness between ignition coil/ion sensor No. 4 terminal C and PCM terminal 1AV PCM connector or terminals malfunction Short to power supply in wiring harness between ignition coil/ion sensor No. 4 terminal C and PCM terminal 1AV Open circuit in wiring harness between ignition coil/ion sensor No. 4 terminal C and PCM terminal 1AV Ion sensor No. 4 malfunction PCM malfunction