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.
1991 Suzuki Samurai JSFACTORY OEM SERVICE PROCEDURE
Fuel Injector Circuit Test
- Ensure fuel pressure is within specification. See BASIC TESTING article in the ENGINE PERFORMANCE Section. If fuel pressure is not within specification, see appropriate FUEL PUMP CIRCUIT TEST under FUEL DELIVERY .
- Check fuel injector operation. See FUEL INJECTOR(S) under FUEL CONTROL . Turn ignition off. Disconnect injector connector and measure resistance between injector connector terminals. Resistance should be 0.8-1.8 ohms at 68°F (20°C). If resistance is not as specified, replace injector. If resistance is within specification, go to next step.
- Disconnect ECM connector "B" from ECM. Measure resistance between connector terminals B8 (Red Wire) and B17 (Yellow wire). Resistance should be 0.8-1.8 ohms at 68°F (20°C). If resistance is not as specified, check Red and Yellow wires for short, open or poor connections.
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.
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