P2501
DTC P2501
CIRCUIT DESCRIPTION
The engine control module (ECM) or powertrain control module (PCM) uses the generator turn on signal circuit to control the load of the generator on the engine. A high side driver in the ECM/PCM applies a voltage to the voltage regulator. This signals the voltage regulator to turn the field circuit ON and OFF. When the ECM/PCM turns ON the high side driver, the voltage regulator turns ON the field circuit. When the ECM/PCM turns OFF the high side driver, the voltage regulator turns OFF the field circuit.
The ECM/PCM monitors the state of the generator turn on signal circuit. The ECM/PCM should detect a low generator turn on signal circuit voltage when the key is ON and the engine is OFF, or when the charging system malfunctions. If the ECM/PCM detects a high generator turn on signal circuit voltage, DTC P2501 will set.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P2501 Generator L-Terminal Circuit High Voltage
CONDITIONS FOR RUNNING THE DTC
- No generator, crankshaft position (CKP) sensors, or camshaft position (CMP) sensor DTCs are set.
- The ignition is in the ON position.
- The engine is not running.
CONDITIONS FOR SETTING THE DTC
The ECM or PCM detects a high signal voltage on the generator turn on signal circuit for at least 5 seconds.
ACTION TAKEN WHEN THE DTC SETS
- The ECM/PCM will not illuminate the malfunction indicator lamp (MIL).
- The ECM/PCM will store the conditions present when the DTC set as Fail Records data only.
- The ECM/PCM will send a class 2 serial data message to the instrument panel cluster (IPC) and driver information center (DIC) to illuminate the charge indicator or display a charging message.
CONDITIONS FOR CLEARING THE MIL/DTC
- The conditions for setting DTC P2501 are not present.
- The DTC can be cleared by using the scan tool Clear DTC Information function.
TEST
