Circuit Description

PCM uses a common 5-volt reference No. 1 circuit as a sensor feed to A/C pressure, MAP, Engine Oil Pressure (EOP) and left tank fuel level sensors. PCM monitors voltage on 5-volt reference No. 1 circuit. If voltage is out of range, DTC will set.

DTC will set when PCM detects 5-volt reference No. 1 circuit is out of range and condition is met for greater than 2 seconds.