2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1919
A high side driver in the ECM applies a voltage to the voltage regulator. This controls the voltage regulator to turn the field circuit ON and OFF.
The ECM monitors the state of the generator turn ON control circuit. The ECM should detect low voltage on generator turn on control circuit when
the ignition is ON and the engine is OFF, or when the charging system malfunctions. With the engine running, the ECM should detect high voltage
on the generator turn on control circuit. The ECM performs tests to determine the status of the generator turn on control circuit.
Conditions for Running the DTC
P2500
The engine is running.
P2501
* The ignition is ON.
* The engine is OFF.
Conditions for Setting the DTC
P2500
The ECM detects low voltage on the generator turn on control circuit for 2 seconds.
P2501
The ECM detects high voltage on the generator turn on control circuit for 2 seconds.
Action Taken When the DTC Sets
The charge indicator turns ON 15 seconds after the DTC sets.
Conditions for Clearing the DTC
* The DTC will pass when the conditions for setting the DTC are no longer met for 2 seconds.
* A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
* The charge indicator turns OFF 15 seconds after the DTC passes.
Reference Information
Schematic Reference
Starting and Charging Schematics (See: Starting and Charging/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Charging System Description and Operation (See: Starting and Charging/Charging System/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Testing
1. Verify that a test lamp illuminates between the G13 generator B+ terminal A X2 and ground.
瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
