P1635

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) provides a 5 volt supply for use in powering up sensors. This test monitors the voltage present at terminals BRD13 (shared by Boost, EGR Control Pressure/Baro and Crankshaft Position sensors) and BRD14 (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 EGR.
- No turbo boost.

CONDITIONS FOR CLEARING THE MIL/DTC
- A History DTC will clear when forty consecutive warm-up cycles that the diagnostic does not fail (coolant temperature has risen 5°C (40°F) from start up coolant temperature and engine coolant temperature exceeds 71°C (160°F) that same ignition cycle.

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
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.