Fuel Injectors, Bank 1, Checking

The following test procedure is used to diagnose fuel injectors Fuel Injectors -N30, N31, N32- controlled by the Engine Control Module (ECM) -J623-.

Special tools and workshop equipment required 

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

Test requirements 

• The Engine Control Module (ECM) -J623- fuses OK.
• 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 Clean Working Conditions.

Test procedure 

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

Start diagnosis 

-- Disconnect the 6 pin electrical harness connector -1- for Fuel Injectors -N30, N31, N32- from the right rear of the engine.

Checking internal resistance 

-- Using a multimeter, check harness terminals of connector -1- for resistance.

Injector	6- pin electrical harness connector terminals
Injector N30	1 to 2
Injector N31	3 to 4
Injector N32	5 to 6

Specified value: 12.0 to 20.0 Ω (at approx. 20° C)

If the specified value was not obtained:

-- Replace the faulty Fuel Injector --. Refer to the appropriate service information.

If the specified value was obtained:

Checking activation 

-- Connect a diode test lamp (12V) to the Fuel Injector -- electrical harness connector terminals 1 and 2 of the Fuel Injector -- to be tested.

-- Operate the starter and test the activation of the Fuel Injector --.

LED should flicker.

-- Switch the ignition off.

If LED flickers:

-- Replace the faulty fuel Injector. Refer to the appropriate service information.

If LED does not flicker:

Checking wiring 

If the manufacturers test box is being used, perform the following step.

-- Install the test box.

If the manufacturers test box is not being used, perform the following step.

-- Remove the Engine Control Module (ECM) -J623-. Refer to the appropriate service information.

-- Using a multimeter, check the electrical harness connector terminals of the fuel Injector to be tested to the Engine Control Module (ECM) -J623- electrical harness connector T60 terminals for resistance.

Component	Fuel Injector -- electrical harness connector terminals	Engine Control Module (ECM) -J623- electrical connector T60 terminals or test box sockets
Cylinder 1 Fuel Injector -N30-	2	31
Cylinder 2 Fuel Injector -N31-	2	33
Cylinder 3 Fuel Injector -N32-	2	46

Specified value: 1.5 Ω Max.

If the specification is not obtained:

-- Check the wiring for an open circuit, a short circuit to each other, Battery (+), or Ground (GND).

-- 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:

-- Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .

-- Perform a road test to verify repair.

If the DTC does not return:

Generate readiness code. Refer to READINESS CODE .

If the DTC returns and no malfunction is found in the wiring and voltage supply was OK:

-- Replace the Engine Control Module (ECM) -J623-. Refer to the appropriate service information.

Assembly is performed in the reverse order of the removal, note the following:

Final procedures 

After 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 .