Contents Section: Engine Electrical All sections

DTC p2500 Opel GT II

Engine Electrical ~288 words

DTC p2500

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P2500:

Generator L-Terminal Circuit Low Voltage

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Generator Turn On SignalP2500P2500P2501--

Circuit/system 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.

Conditions for Running the DTC

No generator, crankshaft position (CKP) sensors, or camshaft position (CMP) sensor DTCs are set.
The engine is running.

Conditions for Setting the DTC

The ECM detects a low signal voltage on the generator turn on signal circuit for 15 seconds.

Action Taken When the DTC Sets

The instrument panel cluster (IPC) illuminates the charge indicator.

Conditions for Clearing the DTC

DTC P2500 is a C type DTC.

Reference Information

Schematic Reference

Starting and Charging Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Charging System Description and Operation

Electrical Information Reference (Except Opel Gt)

Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/system Testing

  1. Ignition OFF, disconnect the harness connector X1 at the generator.
  2. Engine running, test for greater than 3.5 volts between the generator turn on signal circuit terminal B X1 and ground.
  3. If the circuit tests normal, test or replace the generator.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Generator Replacement
Control Module References for ECM replacement, setup, and programming