P1635

Diagnostic Chart:

Wiring Diagram:

The five volt reference circuit provides a signal voltage to the linear EGR, MAP sensor, and TP sensor. The return line is grounded through the PCM. DTC P1635 detects a short to ground in any of the three, five volt reference circuits or inside the PCM.

CODE PARAMETERS
DTC P1635 will set if:

The five volt reference signal is below 3.5 volts or above 5.5 volts. This voltage is monitored internally by the PCM.

IMPORTANT: The five volt reference is monitored whenever the ignition is On.

DIAGNOSTIC AIDS
If DTCs P0563, P0108, P1106, P0452, P0453, P1122 or P0122 set a short to B+ on the five volt reference circuit is probable. If the short exists while attempting to diagnose, PDT communications will be lost and drive ability conditions will exist.