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 MANUALSISUZU1996TROOPER S, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGFUEL SYSTEMFUEL PUMP RELAY TEST
1996 Isuzu Trooper S, Automatic
Fuel Pump Relay Test
1996 Isuzu Trooper S, AutomaticSECTION Fuel Pump Relay Test
- PCM supplies power to relay as long as PCM receives ignition reference signals or starter crank signal. To run fuel pump without starting engine, remove relay and jumper terminals No. 2 and 4.
- To test relay, use jumper wires to ground terminal No. 3 of relay and apply battery voltage to terminal No. 1 of relay. Using ohmmeter, check for continuity between relay terminals No. 2 and 4. If continuity does not exist, replace relay.
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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.