Ignition Coil N152, Checking

The following procedure is used to diagnose Ignition Coil -- N152.

Special tools and workshop equipment required 

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

Test requirements 

• The Ignition Coil - N152- fuse OK.
• The Fuel Pump (FP) Relay -J17- OK.VOLTAGE SUPPLY, CHECKING
• The Engine Speed (RPM) Sensor -G28- OK, ENGINE SPEED SENSOR G28, CHECKING .
• The Camshaft Position (CMP) Sensor -G40- OK, CAMSHAFT POSITION SENSOR G40, CHECKING .
• 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.

Test procedure 

-- Perform a Preliminary Check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis 

-- Remove the engine cover with air filter.

-- Remove the Ignition Coil -N152- electrical connector.

Checking voltage supply 

-- 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 Ignition Coil -- electrical harness connector terminal 2 to the Fuse (on fuse panel) -29- for an open circuit.

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 (GND).

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

-- If necessary, repair the faulty wiring connection.

If the specified values were obtained:

Checking activation 

-- Disable the power supply to the Fuel Injectors -N30, N31, N32, N33,- by removing Fuse 29 (on fuse panel B) from the fuse holder SB29, in the E-box, plenum chamber.

-- Using a diode test lamp, check the Ignition Coil -- electrical harness connector terminals 1 to 4 and 3 to 4 for voltage.

-- Operate the starter.

The LED should flicker.

-- Switch the ignition off.

If the LED flickers and the voltage was OK:

-- Replace the faulty Ignition Coil -N152-. Refer to Ignition/Glow Plug System .

If the LED does not flicker:

Checking wiring 

If the manufacturers test box is being used. Perform the following step.

-- Install the Adapter F/VAG 1598 (68 Pin) VAG 1598/22. Refer to Engine Mechanical, Fuel Injection & Ignition, Repair Group 24.

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

-- Remove the Motronic Engine Control Module (ECM) -J220-. Refer to MOTRONIC ENGINE CONTROL MODULE J220, REPLACING .

-- Using a Multimeter, Check the Ignition Coil -- electrical harness connector to the Motronic Engine Control Module (ECM)J220 electrical harness connector T80 for an open circuit.

Ignition Coil -N152- electrical harness connector terminal	Motronic Engine Control Module (ECM) J220 electrical harness connector T80 terminal or test box socket
3	78
1	71

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 (GND).

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

-- If necessary, repair the faulty wiring connection.

-- Re-enable the power supply to theFuel Injectors -N30, N31, N32, N33,- by reinstalling Fuse 29 (on fuse panel B) from the fuse holder SB29, in the E-box, plenum chamber.

-- Re-connect the Ignition Coil -N152- electrical harness connector to the Ignition Coil -N152-.

-- Install the engine cover with air filter.

-- 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:

Repair complete, Generate readiness code. Refer to READINESS CODE .

-- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:

-- Replace the Motronic Engine Control Module (ECM) -J220-. Refer to MOTRONIC ENGINE CONTROL MODULE J220, REPLACING .

-- Assembly is performed in the reverse of the removal.

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 .

End of diagnosis.