Component Tests and General Diagnostics

Charging System Test

Diagnostic Instructions

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

Reference Information
Schematic Reference

Starting and Charging Schematics Electrical Diagrams
Connector End View Reference

Component Connector End Views Connector Views
Description and Operation

Charging System Description and Operation Description and Operation
Electrical Information Reference

* Circuit Testing Component Tests and General Diagnostics
* Connector Repairs Component Tests and General Diagnostics
* Testing for Intermittent Conditions and Poor Connections Component Tests and General Diagnostics
* Wiring Repairs Component Tests and General Diagnostics

Circuit/System Verification

Engine running, observe the charge indicator on the instrument panel cluster (IPC) or message in the driver information center (DIC). The charge indicator on the IPC should be turned OFF and the DIC should not display any charging system message.

Circuit/System Testing

1. Ignition ON, verify that no generator or battery current sensor DTCs are set that would cause a charging system concern.

• If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

2. Ignition OFF, measure the voltage across the battery terminals. The voltage should read 12.0 volts or greater at room temperature.

• If not within the specified value, refer to Battery Inspection/Test Battery Inspection/Test.

3. Connect a carbon pile tester to the battery.
4. Start the engine and increase the engine speed to 2,500 RPM. Observe the voltage reading on the tester. The voltage should read between 12.6-15.0 volts.

• If not within specified range, replace the generator.

5. Adjust the carbon pile tester to the specified load test output value, refer to Generator Usage Specifications.

• If not within specified value, replace the generator.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Generator Replacement (LY7) Generator Replacement (LY7)Generator Replacement (LE5/LE9) Service and RepairGenerator Replacement (LZ4)