P1635

Diagnostic Chart:

Wiring Chart:

CIRCUIT DESCRIPTION

The PCM provides a 5 volt supply for use in powering up the sensors. This test monitors the voltage present at terminals BRD13 (shared by Boost and Crankshaft Position sensors) and BRD14 (the Optical/Fuel temperature sensor (Cam/HI. Res)).

CONDITIONS FOR SETTING THE DTC

5 volt reference is less than 1 volt.

ACTION TAKEN WHEN THE DTC SETS

^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).

^ The PCM records the operating conditions at the time the diagnostic fails. This information stores in the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC

A History DTC will clear after forty consecutive warm-up cycles during which the diagnostic does not fail (the coolant temperature has risen 5°C (40°F) from the start up coolant temperature and the engine coolant temperature exceeds 71°C (160°F) during that same ignition cycle).

Use of a Scan tool will clear the DTC codes.

DIAGNOSTIC AIDS

During the time the failure is present, the setting of additional DTCs that share a 5 volt reference may also set.

TEST DESCRIPTION

The number(s) below refer to the step number(s) on the Diagnostic Table.

2. Checks to confirm that a DTC is still present.

3. Checks to determine if there is a 5 volt reference from the PCM.

4. Checks to determine if there is a short-to-ground in the reference circuit or a short-to-ground in the PCM.

7. This step determines if the short is being caused by one of the sensor or the short is in the wiring harness.