Circuit Description
The L-terminal circuit from the generator is a discrete into the PCM.
The PCM supplies the ignition voltage to the generator lamp feed. This ignition
voltage is pulled low by the generator once the ignition switch
supplies ignition 1 voltage. The voltage stays low until the generator
turns. When the generator is up and running, the PCM detects ignition
voltage. Therefore, with no failures with the vehicle's charging
system, the lamp terminal circuit will go low (0 volts) when
the ignition switch is powered up and then goes to the ignition
voltage after the engine is started.
When the charging system detects a fault (circuit shorted to ground),
the Instrument Panel Cluster (IPC) displays a message.
Conditions for Running the DTC
Engine operating.
Conditions for Setting the DTC
The PCM detects an improper voltage on the generator L terminal circuit.
Action Taken When the DTC Sets
| • | The PCM illuminates the malfunction indicator lamp (MIL) on the
second consecutive drive trip that the diagnostic runs and fails. |
| • | The PCM records the operating conditions at the time the diagnostic
fails. The first time the diagnostic fails, the Failure Records will store
this information. If the diagnostic reports a failure on the second consecutive
drive trip, the Freeze Frame records the operating conditions at the time
of failure and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn the MIL off after three consecutive trips without
a fault condition. |
| • | A History DTC clears after forty consecutive warm-up cycles,
if this or any other emission related diagnostic does not report any failures. |
Diagnostic Aids
Important: Remove any debris from the PCM connector surfaces before servicing the
PCM. Inspect the PCM connector gaskets when diagnosing/replacing the
PCM. Ensure that the gaskets are installed correctly. The gaskets prevent
water intrusion into the PCM.
| • | The following may cause an intermittent: |
| - | Poor connections: Check for adequate terminal tension. |
| - | Rubbed through wire insulation |
| - | Broken wire inside the insulation |
| • | A generator fault, such as a shorted output diode, malfunctioning
regulator, open or shorted rotor may cause a low battery charge. |
