For 1990-2009 cars only
Circuit Description
The PCM provides a 5 volt supply for use in powering up sensors. This test monitors the voltage present at the 5 volt reference terminal 55.
Conditions for Running the DTC
The 5 volt reference is less than 1 volt.
Conditions for Setting the DTC
The ignition switch is in the on position
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 stores in the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures. |
| • | Use of a scan tool |
Diagnostic Aids
Important: Remove any debris from the PCM module connector surfaces before servicing the PCM module. Inspect the PCM module connector gaskets when diagnosing/replacing the module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM module.
During the time the failure is present, the setting of additional DTCs that share a 5 volt reference may also set.
