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 MANUALSSUZUKI1990SWIFT GA, 4D SEDANREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSIDLE CONTROL SYSTEMIDLE SPEED CONTROL (ISC) SYSTEM (SIDEKICK)
1990 Suzuki Swift GA, 4D Sedan
Idle Speed Control (ISC) System (Sidekick)
1990 Suzuki Swift GA, 4D SedanSECTION Idle Speed Control (ISC) System (Sidekick)
- Warm engine to normal operating temperature. With engine idling, turn on headlights. Note if idle speed increases when headlights are turned on. If idle speed did not increase, proceed to step 2). If idle speed increased, ISC solenoid and wiring circuit are okay.
- Turn engine off. Disconnect ECM connector. The ECM is located at upper left corner of instrument panel. Turn ignition on. Note if battery voltage is present at terminal A3 (Brown/Yellow wire) of ECM connector with headlights on. No voltage should be present with headlights off.
- If no voltage is present with headlights on, check for open in Brown/Yellow wire. See WIRING DIAGRAMS article. If battery voltage was present, using ohmmeter, check resistance between ECM terminals B6 (Light Green/Black wire) and B15 (Blue wire) of ECM connector.
- If resistance is 6.6 ohms, go to step 6). If resistance is not 6.6 ohms, disconnect ISC solenoid electrical connector. Measure resistance between ISC solenoid terminals. Resistance should be 5.4-6.6 ohms.
- Replace ISC solenoid if resistance is not correct. If resistance was correct, check wiring between ECM and ISC solenoid for opens, shorted Blue wire to Light Green/Black wire, or poor connection at ISC solenoid.
- Check ISC solenoid operation. See IDLE SPEED CONTROL (ISC) SOLENOID under IDLE CONTROL SYSTEM in this article. Replace ISC solenoid if defective. If ISC solenoid was okay, check for defective connections at ECM. If connections are okay, substitute ECM and recheck operation.
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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.