The PCM provides a 5volt reference voltage to the Acceleration Position Sensor 2(APS2) , Throttle Position Sensor 2(TPS2), A/C pressure sensor and power steering sensor. The PCM monitors reference voltage deviation from the power supply circuit of the sensors.
Checking the voltage from sensor power supply every 1.87 sec. under detecting condition, if the value within detecting condition lasts for more than 0.2 sec., PCM sets P0651. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Sensor reference voltage check
? Short in sensor power supply line
? Faulty PCM
Enable Condition
? Key "ON"
Threshold Value
? Sensor supply power < 4.5V or > 5.5V
Diagnosis Time
? Continuous (More than 0.2 seconds failure for every 1.87 seconds test )
MIL ON Condition
? 2 driving cycles