Test 10: Fuel Injector Inspection

WARNING: This page is about a different car, the 2005 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.

FUEL INJECTOR INSPECTION CHART

TEST 10		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 "eliciting"?	Yes	Go to step 3.
1		No	Go to next step.
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	REPACE injector(s). See FUEL INJECTORS . Go to next step.
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 . Remove fuel rail assembly from intake manifold. Connect fuel lines. Remove the fuel pump relay. 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 INJECTORS . CHECK for leaking O-rings and fuel rail damage. REPAIR or REPLACE as necessary.