Initial Inspection and Diagnostic Overview

Charging System Test

Diagnostic Instructions

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

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

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The starter/generator control module supplies the energy that flows between the high voltage (110 volt) direct current (DC) and low voltage (14 volt) DC to charge the 12 volt battery and power accessories. For more information about the starter/generator control module functions, refer to Drive Motor Battery System Description Drive Motor Battery System Description.

Reference Information

Schematic Reference

Starting and Charging Schematics (HP6) Starting and Charging Schematics (HP6)

Connector End View Reference

Component Connector End Views Sunshade - Left

Description and Operation

Charging System Description and Operation Charging System Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Circuit/System Testing

1. Ignition ON.

2. 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 Diagnostic Trouble Code (DTC) List - Vehicle.

• If no DTCs are set

3. Ignition OFF, measure the voltage across the battery terminals.

4. Verify battery voltage is 12.0 V or greater at room temperature.

• If less than 12.0 V
Refer to Battery Inspection/Test Battery Inspection/Test.

5. Engine ON, all electrical accessories OFF, increase engine speed to 2,500 RPM.

6. Verify the battery voltage is between 12.6-15.0 V.

• If less than 12.6 V or greater than 15.0 V
Replace the K59 starter/generator control module.

• If between 12.6-15.0 V

7. Engine ON, all electrical accessories ON, increase engine speed to 2,500 RPM.

8. Verify the battery voltage is between 12.6-15.0 V.

• If less than 12.6 V or greater than 15.0 V
Replace the K59 starter/generator control module.

• If between 12.6-15.0 V

9. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Starter Generator Replacement Starter Generator Replacement