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

NOTE: The 5 volt reference is monitored whenever the ignition is On.

DIAGNOSTIC AIDS

When attempting to diagnose an intermittent problem, use the Scan tool to review malfunction history diagnostic information. The supplemental data can be used to duplicate a problem.

Intermittents or opens suspected to be at the connector can be detected by using diagnostic service probe. Voltage can be read on both wires without disconnecting any connectors.

Check the tightness of the female terminal grip with a spare male terminal.