Test 12: Fuel Injector Inspection

TEST 12: FUEL INJECTOR INSPECTION

TEST 12	FUEL INJECTOR INSPECTION
STEP	INSPECTION		ACTION
1	LISTEN FOR INJECTOR OPERATION Warm up engine and run at idle (or cranking if engine will not start). Listen for "clicking" sound from the injectors (use stethoscope if necessary). Are all injectors "clicking"?	Yes	Go to step 3.
1		No	Go to step 2.
2	CHECK INJECTOR RESISTANCE Disconnect suspect injector connectors. Measure resistance of injectors. Is resistance between 11-18 ohms (20°C {68°F})?	Yes	Check injector driver circuits from PCM.
2		No	Replace injector(s). See FUEL SYSTEM in REMOVAL, OVERHAUL, & INSTALLATION article in Engine Performance . Go to step 3.
3	CHECK INJECTORS FOR FUEL LEAKAGE WARNING: Before performing the following operation, release the fuel pressure from the fuel system to reduce the possibility of injury or fire. See FUEL SYSTEM PRESSURE RELEASE in REMOVAL, OVERHAUL, & INSTALLATION article in Engine Performance . Remove fuel rail assembly from intake manifold. Connect fuel lines. Install jumper wire between DLC terminal FP and ground. Key ON, Engine OFF (KOEO). Check for fuel leaks from injectors. Is fuel leakage less than 1 drop per 2 minutes?	Yes	Fuel injectors are not leaking.
3		No	Remove leaking injector. See FUEL SYSTEM in REMOVAL, OVERHAUL, & INSTALLATION article in Engine Performance . Check for leaking O-rings and fuel rail damage. Repair or replace as necessary.