Ignition Coil, Checking

The following procedure is used to diagnose all Ignition Coils with Power Output Stage --.

Special tools and workshop equipment required 

• Multimeter.
• Diode test lamp.
• Wiring diagram.

Test requirements 

• The fuses OK.
• The Engine Control Module (ECM) Power Supply Relay -J271- OK.
• The Engine Speed (RPM) Sensor -G28- OK.
• The Camshaft Position (CMP) Sensor -G40- 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 connections between engine/transmission/chassis OK.
• Ignition switched Off.

Test procedure 

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

Start diagnosis 

-- Remove the Ignition Coil with Power Output Stage -N152- electrical harness screws.

-- Disconnect the electrical harness connector from the Ignition Coil with Power Output Stage -N152-.

-- Switch the ignition ON.

-- Using a Multimeter, check the Ignition Coil -- electrical harness connector terminals 2 to 4 for voltage.

Specified value: battery voltage.

-- Switch the ignition OFF.

If the specified value was not obtained: 

-- Check the Ignition Coil -- electrical harness connector terminal 2 to Fuse, (Refer to applicable wiring diagram for fuse positions) for an open circuit or a short circuit to Ground (GND).

-- Check the wiring connection for an open circuit or short circuit.

-- Check the wiring connection for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection and replace any open fuses

-- Go to Final procedures

If the specified value was obtained: 

Checking activation 

-- Disable the power supply to the Fuel Injectors -N30, N31, N32, N33- by removing Fuel Pump Relay -J17-.

-- Using a diode test lamp, check the Ignition Coil with Power Output Stage -N152- electrical harness connector terminals 2 to 1 and then 2 to 3 for flashing lamp.

-- Switch the ignition On and Crank the engine.

Specified value: The diode test lamp should flash.

-- Switch the ignition Off.

If the diode test lamp flashes and the voltage was OK: 

-- Replace the faulty Ignition Coil with Power Output Stage -N152-.

If the specified value was Not obtained: 

Checking wiring 

-- Remove the Engine Control Module (ECM) -J623-.

-- Using a multimeter, Check the Ignition Coil electrical harness connector to the Engine Control Module (ECM) -J623- electrical harness connector T60 for an open circuit.

Ignition Coil with Power Output Stage -N152- electrical harness connector terminal:	Engine Control Module (ECM) -J623- electrical harness connector T60 terminal:
1	50
3	35

Specified value: 1.5 Ω Max.

If the specified value was Not obtained: 

-- Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground.

-- Check the wiring connection for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If the specified value was obtained: 

-- Replace the Engine Control Module (ECM) -J623-.

Final procedures 

-- Connect the electrical harness connector to the Ignition Coil with Power Output Stage -N152-.

-- Install the Ignition Coil with Power Output Stage -N152- electrical harness screws.

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 .