2010 Cadillac Truck SRX AWD V6-3.0L Page 2054
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions)provides an overview of each diagnostic category.
DTC Descriptors
DTC P2500
- Generator L-Terminal Circuit Low Voltage
DTC P2501
- Generator L-Terminal Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The engine control module (ECM) uses the generator turn on control circuit, or L-terminal 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 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
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