The starter/generator control module (SGCM) phase U/V/W current sensor is used for motor control and power inverter module (PIM) current sensor rationality check. The current sensor is soldered on the control board near the phase U/V/W bus bar. The SGCM monitors the current sensor for the following:

P1AAE

To detect the electrical failure (short condition) of the phase current sensor

P1AAF

To detect a phase wire open condition

If one of the above conditions is detected, the SGCM will set the appropriate DTC.

P1AAE

Current is less than or greater than 200A for 20 ms.

P1AAF

Current output is greater than 200A for 200 ms.

P1AAE

P1AAF

Stop PWM (MGU shutdown)

P1AAE

Sum of 3 phase current returns to normal.

P1AAF

Current amp output returns to normal.

P1AAE

P1AAF

Schematic Reference

Hybrid Controls Schematics

Connector End View Reference

Hybrid Controls Connector End Views

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

Caution: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.

1. If DTC is history, refer to Testing for Intermittent Conditions and Poor Connections .
2. Ignition OFF, disable the hybrid system. Refer to Hybrid Battery Service Disconnect/Connect .

Notice: Refer to Fastener Tightening Specifications in the Preface section.

Important: It is important that the 3-phase cable connections are clean and the fasteners are torqued to specifications.

3. Inspect for poor connections and any evidence of arching at the 3-phase cable connectors of the SGCM and the MGU.
4. Disconnect the 3-phase cables from the SGCM. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
5. Test each of the 3-phase cables for an open as follows:

•	Cable U to V

•	Cable U to W

•	Cable V to W

6. Test each of the 3-phase cables for a short to ground.

⇒	If all circuits test normal, replace the SGCM.

7. Disconnect the 3-phase cables from the MGU. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
8. Test each of the 3-phase cables individually for an open.

⇒	If all circuits test normal, replace the MGU.

⇒	If any circuit does not test normal, replace the 3-phase cable assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.