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.
1990 Suzuki SamuraiFACTORY OEM SERVICE PROCEDURE
Fuel Pump Circuit Test (Sidekick)
- Turn ignition on, engine off. Fuel pump should operate for 2 seconds. If fuel pump does not operate, using jumper wire, connect Pink/Black and Black/White wires of fuel pump/control relay. See FUEL PUMP RELAY LOCATION table. If fuel pump operates, go to next step. If fuel pump does not operate, go to step 5).
- If fuel pump operates with jumper wire installed, check for power at Black/Yellow and Black/Green wire terminals of fuel pump/control relay while engine is cranking. If power is NOT present at Black/Green wire terminal, replace control relay. If power is NOT present at Black/Yellow wire terminal, check starter circuit wiring. See appropriate WIRING DIAGRAMS article.
- Check for power at Pink wire terminal of fuel pump control relay. If power is NOT present, replace relay. If power is present at Pink wire terminal of fuel pump control relay, check for power at Pink wire terminal B16 of ECM connector. If power is not present, repair Pink wiring circuit from ECM to fuel pump control relay. If power is present at Pink wire terminal B16 of ECM connector, ground Pink wire at ECM connector, fuel pump should operate. If fuel pump does not operate, check for power at fuel pump Pink/Black wire terminal. If fuel pump has power, check ground circuit. If ground circuit is okay, replace fuel pump.
- If grounding Pink wire terminal B16 at ECM connector, fuel pump does operate, check ignition system signal to ECM for problem. See TESTS W/CODES article.
- If fuel pump did not operate in step 1), check for power at Black/White wire terminal of fuel pump control relay. If power is NOT present, check for power at fuse No. 8 and in Black/White wiring circuit to fuel pump control relay, repair as required. See appropriate WIRING DIAGRAMS article.
Factory Service Tools
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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.