LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 1995 >> Swift Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Control >> Fuel Injector Circuit Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Fuel Injector Circuit Test

  1. Turn ignition on. If fuel is not injected from injector when ignition is turned on (without cranking engine), go to step 3). If fuel is injected from injector when ignition is turned on (without cranking engine), go to next step.
  2. Check for short to ground in Yellow/Black wire between injector and ECM. If wire is okay, check fuel injector and fuel injector resistor. See FUEL INJECTOR(S) and FUEL INJECTOR RESISTOR. If fuel injector and fuel injector resistor are okay, replace ECM.
  3. Crank engine. If fuel is NOT injected during cranking, go to next step. If fuel is injected during cranking, turn ignition off and check fuel injector for leaks. See FUEL INJECTOR(S). If fuel injector leaks, replace fuel injector. If fuel injector does not leak, fuel injector circuit is okay.
  4. Using a stethoscope, listen for operating sound of fuel injector while cranking engine. If operating sound is not heard, go to next step. If operating sound is heard, check fuel pump. See appropriate FUEL PUMP CIRCUIT TEST under FUEL DELIVERY  .
  5. Turn ignition off. Disconnect fuel injector connector. Check resistance between fuel injector connector terminals. If resistance is 0.5-1.5 ohms at 68°F (20°C), go to step 7). If resistance is not within specification, check for open sub-wires (short section of wires between fuel injector and connector).
  6. If sub-wires are okay, check for poor connection at sub-wire connector. If connection is okay, replace fuel injector.
  7. Check fuel injector resistor. See FUEL INJECTOR RESISTOR. Replace fuel injector resistor if not within specification. If fuel injector resistor is okay, turn ignition off. Connect fuel injector and fuel injector resistor connectors.
  8. Disconnect 12-pin ECM connector. Turn ignition on. If battery voltage is present on ECM terminal A2, go to next step. If battery voltage is not present, repair open in circuit between MFI main relay and ECM.
  9. Check for poor connection at ECM connector terminal A2. If connection is good, replace ECM.
scientia non olet · About LEMON Manuals