P2500
DTC P2500
Circuit Description
The engine control module (ECM) uses the generator turn on signal circuit to control the load of the generator on the engine. A high side driver in the ECM applies a voltage to the voltage regulator. This signals the voltage regulator to turn the field circuit ON and OFF. When the ECM turns ON the high side driver, the voltage regulator turns ON the field circuit. When the ECM turns OFF the high side driver, the voltage regulator turns OFF the field circuit.
The ECM monitors the state of the generator turn on signal circuit. With the engine running, the ECM should detect a high generator turn on signal circuit.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P2500 Generator L-Terminal Circuit Low Voltage
Conditions for Running the DTC
* No generator, crankshaft position (CKP) sensors, or camshaft position (CMP) sensor DTCs are set.
* The engine is running.
* The generator has not been commanded OFF by the ECM or scan tool.
Conditions for Setting the DTC
The ECM detects a low signal voltage on the generator turn on signal circuit for at least 15 seconds.
Action Taken When the DTC Sets
* The ECM will not illuminate the malfunction indicator lamp (MIL).
* The ECM will store the conditions present when the DTC set as Fail Records data only.
* The ECM 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 P2500 are not present.
* The DTC can be cleared by using the scan tool Clear DTC Information function.
Test
