The ECM provides a 5 volt reference voltage to Throttle Position Sensor 1(TPS1). 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 P0641. 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 | 1. Short in sensor power supply line 2. 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 |
