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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 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.