Fuel Injector Circuit Test (DOHC)
- Crank engine and check operating sound of each fuel injector. If operating sound can be heard from all 4 fuel injectors, fuel injector circuit is okay. If no operating sound at all is heard from any of the fuel injectors, go to next step. If one or more fuel injector(s) makes no operating sound, go to step 6).
- If no operating sound is heard at all from any of the fuel injectors, turn ignition off. Disconnect ECM 10-pin connector.
- Using an ohmmeter, check for continuity between ECM 10-pin connector terminals C3 and C8. See Fig 1. If continuity does not exist, check for open between terminals C3 and C8 or poor connections at fuel injector. Check for continuity between terminal C5 and ground. If continuity does not exist, check C5 wire for open or poor ground.
- Disconnect ohmmeter. Turn ignition on. Using a voltmeter, check for battery voltage between ECM terminal C2 and ground. If battery voltage is not present, check for open circuit. Check EFI main relay. See EFI MAIN RELAY under RELAYS. If ohmmeter and voltmeter readings are okay, go to next step.
- If ohmmeter and voltmeter readings are okay, check connections at ECM 10-pin connector terminal C3 to C4, C8 to C9, C5 to C10 and C2 to C7. See Fig 2. If connections are okay, substitute a known good ECM and retest.
- If one or more fuel injector(s) makes no operating sound, check each fuel injector connector for poor connection. If okay, check fuel injectors. See FUEL INJECTOR(S) under FUEL CONTROL.
Courtesy of SUZUKI OF AMERICA CORP.
Courtesy of SUZUKI OF AMERICA CORP.