B1911
SCHEMATICSRefer to Generator Controls.
CIRCUIT DESCRIPTION
The PCM uses the generator turn on signal circuit to control the load of the generator on the engine. A high side driver in the PCM applies a voltage to the voltage regulator. This signals the voltage regulator to turn the field circuit ON and OFF. When the PCM turns ON the high side driver, the voltage regulator turns ON the field circuit. When the PCM turns OFF the high side driver, the voltage regulator turns OFF the field circuit.
The PCM monitors the state of the generator turn on signal circuit. The PCM should detect a high generator turn on signal circuit voltage when the engine in running, or when the charging system malfunctions. When this occurs, the PCM will send a class 2 serial data message to the IPC to illuminate the BATTERY NOT CHARGING display in the DTC and set DTC B1911.
CONDITIONS FOR RUNNING THE DTC
^ No generator, CKP sensors, or CMP sensor DTCs are set.
^ The engine is running.
CONDITIONS FOR SETTING THE DTC
^ During the key ON test, the PCM detects a high signal voltage on the generator turn on signal circuit for at least 1 seconds.
^ DTC B1982 is not set.
ACTION TAKEN WHEN THE DTC SETS
^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL)
^ The PCM will store the conditions present when the DTC set as Fail Records data only.
CONDITIONS FOR CLEARING THE DTC
^ 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.
Test Description
