Fuel Injector: Testing and Inspection

CIRCUIT DIAGRAM




INSPECTION
1. Measure the resistance of the injectors between the terminals using an ohmmeter.

Resistance 13-16 W [at 20 °C (68 °F)]

2. If the resistance is not within specifications, replace the injector.







HARNESS INSPECTION

TROUBLESHOOTING HINTS
1. If the engine is hard to start when hot, check for fuel pressure and injector leaks.
2. If the injector does not operate when the engine is cranked, then check the following;
- Faulty power supply circuit to the ECM, faulty ground circuit
- Faulty control relay
- Faulty crankshaft position (CKP) sensor, camshaft position (CMP) sensor
3. If there is any cylinder whose idle state remains unchanged when the fuel injection of injectors is cut one after another during idling, check for the following items about such cylinder.
- Injector and harness
- Ignition plug and high tension cable
- Compression pressure
4. If the injection system is OK but the injector drive time is out of specification, check for the following items.
- Poor combustion in the cylinder (faulty ignition plug, ignition coil, compression pressure, etc.)
- Loose EGR valve seating