PCM/ECM sets DTC P0643 if the PCM/ECM detects reference voltage higher than threshold value.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Electrical Check | 1. Short to battery in power circuit 2. Poor connection or damaged harness 3. Faulty APS2 |
Enable Conditions |
•
Short to battery
•
APS2 >5.5V | |
Threshold Value |
•
Open or Short circuit | |
Diagnostic Time |
•
0.1sec. | |
Mil On Condition |
•
1 driving cycle | |
Limp-Home |
•
Forced limited power mode : The PCM/ECM limits opening angle of the throttle valve to max. 50% and engine torque to a certain pre-determined value.
•
After idle recognition, the PCM/ECM uses APS1 signal to calculate the current opening angle of the throttle valve. |
