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.
Circuit/System Testing
2006 Isuzu Ascender S, 5.3 M, 4WDSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the air suspension inflator switch harness connector X2 at the air suspension compressor assembly.
- If the compressor continues to run, test or replace the air suspension compressor assembly.
- Test for less than 2.0 ohms between the ground circuit connector X2, terminal B and ground.
- If greater than the specified value, test the air suspension compressor assembly ground circuit for an open/high resistance. If the circuit tests normal, replace the air suspension compressor assembly.
- Perform the air suspension inflator switch component test.
- If the air suspension inflator switch fails the component test, replace the switch.
- Ignition ON, connect a fused jumper between terminal A at the air suspension compressor assembly and ground. Verify that the compressor operates.
- If the compressor does not operate, test the IGN 3 and B+ circuits for an open/high resistance or short to ground. If all circuits test normal, test or replace the air suspension compressor assembly.
- Ignition ON and the fused jumper still connected, verify that a test lamp illuminates between the switch indicator control circuit terminal C and ground.
- If the test lamp does not illuminate, test or replace the air suspension compressor assembly.
- If the test lamp illuminates, test the indicator control circuit for an open/high resistance, short to ground, or a short to voltage. If the circuit tests normal, replace the air suspension inflator switch.
RENDER: 1.0x
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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.