P1635

CIRCUIT DESCRIPTION

Schematic:

The PCM uses the 5 Volt Reference A circuit to feed the following sensors:
^ Throttle position (TP) sensor
^ Manifold Absolute Pressure (MAP) sensor
^ Exhaust Gas Recirculation (EGR) pintle position sensor

The PCM monitors the voltage on the 5 Volt Reference A circuit. If the voltage is outside an acceptable range, DTC P1635 will set.

CONDITIONS FOR RUNNING THE DTC
The ignition is ON.

CONDITIONS FOR SETTING THE DTC
^ The PCM detects a voltage out of range condition on the 5 Volt Reference A circuit.
^ The condition exists for less than 1 second.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the diagnostic test runs and fails.
^ The PCM stores the conditions present when the DTC set as Freeze Frame and Fail Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM will turn the MIL OFF after the third consecutive trip in which the diagnostic runs and passes.
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using the scan tool Clear DTC Information function.

DIAGNOSTIC AIDS
If the condition is intermittent, refer to Intermittent Conditions in Symptoms. Intermittent Conditions

TEST DESCRIPTION

Steps 1 - 13:

Steps 14 - 20: