The ECM provides a 5 volt reference voltage to Throttle Position Sensor 2(TPS2). The ECM 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., ECM 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 ECM
Enable Conditions
IG "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 cycle