Ignition Coil N152 , checking
The following procedure is used to diagnose l Ignition Coil.
Special tools, testers and auxiliary items 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 (RPM) Sensor G28 , checking .
- The Camshaft Position (CMP) Sensor G40 OK, → Camshaft Position (CMP) 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 → Motronic Engine Control Module (ECM) J220 , replacing
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 28 - 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/VAG1598 (68 Pin) VAG1598/22. Refer to 24 MULTIPORT FUEL INJECTION (MFI) .
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 (ECM) 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 the Fuel 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: Reset/delete diagnostic data
- 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 (ECM) 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:
- Check the DTC memory. Refer to.
- If necessary, erase the DTC memory. Refer to.
- If the DTC memory was erased, generate readiness code. Refer to.
End of diagnosis