P1633
DTC P1633
CIRCUIT DESCRIPTION
The powertrain control module (PCM) receives the following ignition inputs from the ignition switch:
- The ignition 0 signal
- The ignition 1 signal
- The crank signal
The PCM uses a class 2 Ignition mode message and the voltage input from 2 separate systems to test the ignition 0 circuit. If the PCM detects an improper ignition 0 signal, DTC P1633 will set.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P1633 Ignition 0 Switch Circuit
CONDITIONS FOR RUNNING THE DTC
There is no class 2 serial data circuit condition.
CONDITIONS FOR SETTING THE DTC
The ignition 1 signal is present, but the ignition 0 signal is not.
ACTION TAKEN WHEN THE DTC SETS
- The control module stores the DTC information into memory when the diagnostic runs and fails.
- The malfunction indicator lamp (MIL) will not illuminate.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
- The driver information center, if equipped, may display a message.
CONDITIONS FOR CLEARING THE DTC
- A current DTC Last Test Failed clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
- Clear the DTC with a scan tool.
TEST
