Fuel Injector Test
- With engine idling or cranking (no start), use stethoscope to listen for consistent, operational sounds (clicking) coming from each injector. If operational sounds are present, go to FUEL INJECTOR LEAKAGE TEST. If operational sounds are not present, go to next step.
- Disconnect fuel injector connector and install continuity checker into injector connector. Start or crank engine. Observe whether continuity checker blinks, indicating completed circuit for injector being tested. Repeat continuity check for each injector. If all injector circuits indicate continuity, go to next step. If any circuit does not indicate continuity, turn ignition on. Check for 12 volts at each injector connector. If 12 volts is present at each injector connector, go to next step. If 12 volts is not present at each connector, repair wiring as necessary.
- Using DVOM, check injector resistance. Replace injector if resistance is not about 12-16 ohms at 68°F (20°C). Repeat step 1). If results of step 1) are okay, go to FUEL INJECTOR LEAKAGE TEST. If injector resistance is within specification, go to FUEL INJECTOR LEAKAGE TEST.
Fuel Injector Leakage Test
- Install Fuel Injector Tester/Cleaner (113-00001A). Clean injectors according to tester/cleaner manufacturer's instructions. After injectors are cleaned, check for fuel system pressure loss.
- Fuel injectors are side inject type and cannot be bench tested. Disconnect fuel rail from intake manifold, leaving fuel hoses connected. Using jumper wire, connect fuel pump terminal to ground terminal to activate fuel pump. (Схема №4) Turn ignition on for 10 seconds. Maximum injector leakage rate is one drop per 2 minutes. Replace injector if maximum leakage rate is exceeded.