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, 4WDFACTORY OEM SERVICE PROCEDURE
Testing Procedure
- Perform DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS in SELF-DIAGNOSTICS - ASCENDER 5.3L article. When system check is complete, go to next step.
- Turn ignition on, with engine off. Command the fuel pump relay ON with a scan tool. Does the fuel pump trun ON when commanded with a scan tool? If yes, go to next step. If no, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
NOTE:
Before you proceed with this diagnostic, inspect the fuel system for damage and for external leaks.
CAUTION:
Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gauge. Place the towel in an approved container when the connection of the fuel pressure gauge is complete.
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.