Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN C1500, 5.3 ZREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 844 (HYBRID CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P1A62CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban C1500, 5.3 Z
Circuit/System Testing
2006 Chevrolet Suburban C1500, 5.3 ZSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
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.
- Disconnect harness connector C2 from the SGCM. Refer to Generator Control Module Replacement .
- Using the appropriate test adapters, test for 5 - 100 ohms resistance between terminals 9 and 12.
- If within the specified range, replace the SGCM.
- Disconnect the 7 pin connector at the MGU. Refer to Generator with Starter Replacement .
- Test for less than 1 ohm between SGCM connector harness terminal 12 and the MGU connector harness terminal A.
- If less than the specified range, repair the open circuit.
- Test for less than 1 ohm between SGCM connector harness terminal 9 and the MGU connector harness terminal C.
- If less than the specified range, repair the open circuit.
- If both circuits test normal, replace the MGU.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.