DTC P0641 CIRCUIT DESCRIPTION The powertrain control module (PCM) provides 5 volts to the following sensors: - The manifold absolute pressure (MAP) sensor
- The exhaust gas recirculation (EGR) valve
- The fuel tank pressure (FTP) sensor
- The throttle position (TP) sensor
A circuit condition on one sensor 5-volt reference circuit may affect the other sensor 5-volt reference circuits. The PCM monitors the voltage on the 5-volt reference circuit. If the PCM detects that the voltage is out of tolerance, DTC P0641 sets
Either one of the sensors mentioned above or pcm is faulty, or a short in the 5v reference wire going to one of the components.
You will need a full function scan tool, voltmeter and a good working knowledge of reading wiring schematics and automotive electrical systems to diagnose yourself and then repair.
I will need to know the engine size - 3.4, 3.8 or 3.8 supercharged engine in order to get you the proper wiring schematics and testing procedure