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
Output Signals
NOTE:
Vehicles are equipped with different combinations of computer-controlled components. Not all components listed below are used on every vehicle. For theory and operation on each output component, refer to the system indicated in brackets after component.
- Lock-Up Solenoid Relay (Miscellaneous Controls)
- CHECK ENGINE Light (Self-Diagnostic System)
- Control Relay (Fuel Delivery)
- EGR Vacuum Switching Valve (Emissions)
- Fuel-Cut System (Fuel Control)
- Fuel Pump Relay (Fuel Delivery)
- Idle Speed Control (ISC) Solenoid (Idle Speed)
- Fuel Injector(s) (Fuel Control)
- Mixture Heater Relay (Emissions)
- Canister Purge Vacuum Switching Valve (Emissions)
- Throttle Opener Vacuum Switching Valve (Idle Speed)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.