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 applicable wiring diagram.

Special tools and workshop equipment required 

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

Test Requirements 

• The Engine Speed 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 cover and air intake duct. Refer to appropriate service information.

-- Disconnect the Fuel Injector -- electrical harness connectors from Fuel Injectors -N30, N31, N32, N33, N83, N84-.

Checking internal resistance

-- Using a multimeter, check the Fuel Injector -- terminals 1 to 2 for resistance.

Specified value: 178 KΩ to 184 KΩ (at approx. 20° C)

If the specified value was Not obtained:

-- Replace the malfunctioning Fuel Injector --.

If the specified value was obtained:

Checking wiring

-- Remove the Engine Control Module -J623-. Refer to the Repair Manual.

-- Using a multimeter, check the Fuel Injector -- electrical harness connector terminals to the Engine Control Module -J623- electrical harness connector T105 terminals for a short to ground or voltage, high resistance or an open circuit.

Component	Fuel Injector -- electrical harness connector terminals	Engine Control Module -J623- electrical connector T105 terminals
Cylinder 1 Fuel Injector -N30-	1	85
	2	64
Cylinder 2 Fuel Injector -N31-	1	86
	2	65
Cylinder 3 Fuel Injector -N32-	1	87
	2	66
Cylinder 4 Fuel Injector -N33-	1	1
	2	22
Cylinder 5 Fuel Injector -N83-	1	2
	2	23
Cylinder 6 Fuel Injector -N84-	1	3
	2	24

Specified value: 1.5 Ω Max.

If the specified value was Not obtained:

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

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

-- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring:

-- Replace the Engine Control Module -J623-. Refer to the Repair Manual.

-- Install the engine cover with air filter.

Final Procedures 

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 .