P1635

Diagnostic Chart:

Wiring Diagram:

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)). This is a type D DTC.

CONDITIONS FOR SETTING THE DTC
5 volt reference is less than 1 volt.

ACTION TAKEN WHEN THE DTC SETS
^ Backup fuel.
^ No turbo boost.

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 54734 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-round in the reference circuit or a short-to-ground in the PCM.