The PCM provides a 5volt reference voltage to the Acceleration Position Sensor1(APS2). The PCM monitors reference voltage deviation from the power supply circuit of the APS2.
PCM sets DTC P0642 if the PCM detects reference voltage lower than threshold value.
Item | Detecting Condition | Possible Cause | |
Case 1 | DTC Strategy |
•
Electrical check | 1. Short to ground in power circuit 2. Poor connection or damaged harness 3. Faulty APS2 |
Enable Conditions |
•
IG "ON" | ||
Threshold Value |
•
Short to ground
•
APS power supply voltage_2 < 0.7 V | ||
Case 2 | DTC Strategy |
•
Electrical check | |
Enable Conditions |
•
IG ON | ||
Threshold Value |
•
Sensor or wiring harness problem
•
0.7 V ≤ APS power supply voltage_2 < 4.5 V | ||
Diagnostic Time |
•
0.1 sec | ||
Mil On Condition |
•
1 driving cycle | ||
Limp-Home |
•
Forced limited power mode : The PCM limits opening angle of the throttle valve to max. 50% and engine torque to a certain pre-determined value.
•
After idle recognition, the PCM uses APS1 signal to calculate the current opening angle of the throttle valve. | ||
