Fuel Injectors, Checking

Observe all safety precautions: SAFETY PRECAUTIONS .

View clean working conditions: CLEAN WORKING CONDITIONS .

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the appropriate System Wiring Diagram.

Special tools and workshop equipment required 

• Multimeter.
• Diode test lamp (12V).
• Wiring diagram.

Test requirements

• The Engine Speed (RPM) Sensor -G28- OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window defroster, switched OFF.
• Vehicles with automatic transmission, shift selector lever into position "P" or "N".
• A/C switched OFF.
• Ground (GND) connections between engine/transmission/chassis OK.
• Ignition switched OFF.

-- Observe safety precautions.

-- Observe rules for cleanliness.

Test procedure 

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .

Start diagnosis 

-- Remove the engine covers. Refer to the appropriate Service Information.

-- Disconnect the 14 pin connector. the 14 pin connectors are located at the rear center of the engine, below the throttle motor assembly. There is one 14 pin connector for each bank. (Refer to the appropriate System Wiring Diagram for circuit details).

-- Using a Multimeter connected on the (stationary side of 14 pin connector) to the desired Fuel Injector terminals, measure the resistance of the injector.

Specified value: 1.7Ω (+/-.5Ω)

If the specified values were Not obtained:

-- The supercharger assembly will have to be removed for access to the injectors and engine (jumper) harness.

-- Check for an open or high resistance in the engine harness to the injector. If wiring resistance from 14 pin connector to injector is above 1.5 ohms, repair or replace the harness. If the wiring was within the resistance value, replace the injector. Refer to the appropriate Service Information for supercharger removal and injector replacement.

-- Replace the malfunctioning Fuel injector(s). Refer to appropriate Service Information.

-- Go to Final procedures.

If the specified values were obtained:

-- Reconnect the 14 pin connectors. The 14 pin connectors are located at the rear center of the engine, below the throttle motor assembly. There is one 14 pin connector for each bank. (Refer to the appropriate System Wiring Diagram for circuit details)

-- Remove the Engine Control Module -J623-. Refer to appropriate Service Information.

-- Using a Multimeter, check the Fuel Injectors -- electrical harness connector terminals to the Engine Control Module -J623- electrical harness connector T60 terminals for an open or short to ground circuit.

Component	Fuel Injector -- electrical harness connector terminals:	Engine Control Module -J623- electrical connector T60 terminals:
Cylinder 1 Fuel Injector -N30-	1	3
	2	31
Cylinder 2 Fuel Injector -N31-	1	19
	2	33
Cylinder 3 Fuel Injector -N32-	1	1
	2	46
Cylinder 4 Fuel Injector -N33-	1	4
	2	34
Cylinder 5 Fuel Injector -N83-	1	16
	2	47
Cylinder 6 Fuel Injector -N84-	1	18
	2	32

Specified values: 1.5 Ω max. for wire continuity, and for circuit to ground check; Infinite or "OL" is displayed

If the specified value was Not obtained:

-- Check the wiring for an open, high resistance or short to ground.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection.

-- Go to Final procedures.

If the specified value was obtained:

-- Replace the Engine Control Module - J623-. Refer to appropriate Service Information.

Final procedures 

-- Reinstall the engine cover with air filter, if necessary. Refer to the appropriate Service Information.

-- After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .