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.
2003 Isuzu Axiom Base, RWDFACTORY OEM SERVICE PROCEDURE
Testing Procedure
- Perform DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS in SELF-DIAGNOSTICS - 4.2L ASCENDER article. When the check is complete, go to next step.
- Turn ignition on, with engine off. Command the fuel pump relay ON with a scan tool. If the fuel pump operates, go to next step. If the fuel pump does not operate, see FUEL PUMP ELECTRICAL CIRCUIT DIAGNOSIS .
NOTE:
Inspect the fuel system for damage or external leaks before proceeding with this diagnostic.
NOTE:
Verify that adequate fuel is in the fuel tank before proceeding with this diagnostic.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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