Circuit Description

The 5-volt reference circuit provides a signal voltage to the linear EGR, MAP sensor and TP sensor. The return line is grounded through the PCM. This DTC detects a short to ground in any of the three 5-volt reference circuits or inside the PCM.

DTC will set if the 5-volt reference signal is less than 3.5 volts or greater than 5.5 volts. This voltage is monitored internally by the PCM. The 5-volt reference is monitored whenever the ignition is on.