P1391 Isuzu Wheel Speed Sensor 1, G-Sensor Circuit Performance
Possible causes
– Timing belt or chain stretched or jumped
– Faulty Camshaft Position (CMP) Sensor
– Camshaft Position (CMP) Sensor harness is open or shorted
– Camshaft Position (CMP) Sensor circuit poor electrical connection.
– Faulty Camshaft Position (CMP) Sensor
– Camshaft Position (CMP) Sensor harness is open or shorted
– Camshaft Position (CMP) Sensor circuit poor electrical connection.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1391 Isuzu Description
The ECM detected the actual Camshaft Position Sensor (CMP) position disagreed with the expected CMP level.
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