Possible causes – EGR volume control solenoid valve– EGR volume control solenoid valve harness is open or shorted– EGR volume control solenoid valve circuit poor electrical connection– EGR temperature sensor and circuit When is the code detected? An improper voltage

Possible causes – EGR volume control valve stuck open– Faulty EGR volume control valve– EGR solenoid valve harness is open or shorted– EGR solenoid valve circuit poor electrical connection– Faulty EGR temperature sensor and circuit When is the code detected?

Possible causes – Engine Control Module (ECM) Harness power supply circuit is open or shorted– Engine Control Module (ECM) Programming– Faulty Engine Control Module (ECM) Tech notes Check the ECM fuse, if fuse is OK try erasing the code first

Possible causes – Engine Control Module (ECM) may be faulty– ECM harness power supply circuit is open or shorted– ECM harness ground circuit is open or shorted Tech notes Check the ECM fuse, if fuse is OK try erasing the

Possible causes – Engine Control Module (ECM) not programed– ECM program– Faulty ECM– Wrong ECM Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0602 ISUZU Description This diagnostic trouble code (DTC) indicates a programming error within the

Possible causes – Excessive resistance in the circuit– Low or no fuel– Wiring harness connector of the fuel pressure sensor– Fuel Rail Pressure Sensor– Fuel Pump Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Engine will not

Possible causes – Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection When is the code detected? The DTC P0412 is detected the the AIR vacuum control solenoid circuit not

Possible causes – Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection When is the code detected? The DTC P0418 is detected the the AIR vacuum control solenoid circuit not

Possible causes – Faulty Brake Switch– Brake Switch harness is open or shorted– Brake Switch circuit poor electrical connection When is the code detected? Vehicle speed over 35 MPH and down to 0 MPH 5 times-No change in brake switch

Possible causes – Faulty Brake Switch– Brake Switch harness is open or shorted– Brake Switch circuit poor electrical connection– Misadjusted Brake Switch When is the code detected? The stop light switch does not turn off even once vehicle is driven.

Possible causes – Faulty Brake Switch– Misadjusted brake switch– Brake Switch harness is open or shorted– Brake Switch circuit poor electrical connection When is the code detected? The P0571 codes is set when the stop light switch does not turn

Possible causes – Faulty Camshaft Position Sensor– Camshaft Position Sensor harness is open or shorted– Camshaft Position Sensor circuit poor electrical connection– Faulty starter motor– Starting system circuit– Dead (Weak) battery Tech notes Sometimes and in some models, low battery

Possible causes – Faulty Camshaft Position Sensor– Camshaft Position Sensor harness is open or shorted– Camshaft Position Sensor circuit poor electrical connection– Faulty starter motor– Starting system circuit– Dead (Weak) battery Tech notes Sometimes and in some models, low battery

Possible causes – Faulty Camshaft Position Sensor– Camshaft Position Sensor harness is open or shorted– Camshaft Position Sensor circuit poor electrical connection– Faulty starter motor– Starting system circuit– Dead (Weak) battery Tech notes Sometimes and in some models, low battery

Possible causes – Faulty Camshaft Position Sensor– Camshaft Position Sensor harness is open or shorted– Camshaft Position Sensor circuit poor electrical connection– Faulty starter motor– Starting system circuit– Dead (Weak) battery When is the code detected? The camshaft position sensor

Possible causes – Faulty Camshaft Position Sensor– Camshaft Position Sensor harness is open or shorted– Camshaft Position Sensor circuit poor electrical connection– Faulty starter motor– Starting system circuit– Dead (Weak) battery When is the code detected? The camshaft position sensor

Possible causes – Faulty Clutch Position Sensor– Clutch Position Sensor harness is open or shorted– Clutch Position Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0807 ISUZU Description Clutch Pedal Position (CPP)

Possible causes – Faulty Clutch Position Sensor– Clutch Position Sensor harness is open or shorted– Clutch Position Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty Clutch Position Sensor– Clutch Position Sensor harness is open or shorted– Clutch Position Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty cooling fan clutch– Faulty control unit Symptoms – Engine Light ON (or Service Engine Soon Warning Light)