P1635

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematic:

CIRCUIT DESCRIPTION
The Powertrain Control Module (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 (CKP) sensors, and BRD14, the Optical/Fuel temperature sensor (Cam/HI. Res).

CONDITIONS FOR RUNNING THE DTC
The ignition is in the ON position.

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 is stored in the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
^ A history DTC clears after 40 consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
^ The scan tool Clear Info function was used.

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 numbers below refer to the step numbers on the diagnostic table:
2. Confirms whether a DTC is still present.
3. Determines if there is a 5 volt reference from the PCM.
4. Determines if there is a short-to-ground in the reference circuit or a short-to-ground in the PCM.
7. Determines if the short is being caused by one of the sensors or the short is in the wiring harness.