Charging System Test

Diagnostic Instructions

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Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

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Review Strategy Based Diagnosis for an overview of the diagnostic approach.

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Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Reference Information

Description and Operation

Charging System Description and Operation

Electrical Information Reference

Testing for Intermittent Conditions and Poor Connections

Circuit/System Testing

Ignition ON, verify that no G13 generator or B18 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 .

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

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

Note
Ensure vehicle accessories are OFF for the next step.

Engine ON, increase engine speed to 2 500 rpm. Verify that the battery voltage is 12.6-15.0 V.

If not within specified range, replace the G13 generator.

Engine ON, increase engine speed to 2 500 rpm. Switch ON all accessories in the vehicle. Verify the battery voltage is between 12.6-15.0 V.

If not within specified range, replace the G13 generator.

Repair Instructions