Ignition Coil, Checking
Ignition coil, checking
NOTE:
- Ignition coils and power output stage are one component and are installed in ignition coil.
- Primary resistance of ignition coils cannot be measured.
- Secondary resistance should be tested only with ignition wires connected to ignition coils. To do this, measurements must be made between spark plug connectors of appropriate ignition coil. This measurement also measures the interference-suppression resistors of all ignition wires.
Recommended special tools and equipment
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1527 Voltage tester
- V.A.G 1594 Connector test set
- Wiring diagram
Test requirements
- The respective fuses of Ignition Coil -N152- must be OK:
- Fuel Pump (FP) Relay -J17- must be OK, check:
- Battery voltage must be at least 11.5 volts.
- All electrical consumers like, for example, lights and rear window heating must be switched off.
- Parking brake must be engaged or else daylight driving lights will be switched on.
- If vehicle is equipped with an A/C system, it must be switched off.
- Ground (GND) connections between engine and chassis must be OK.
- Engine speed (RPM) sensor must be OK, checking
- Camshaft Position (CMP) sensors must be OK, checking Testing and Inspection
- Ignition switched off.
Test sequence
- Disconnect 5-pin connector -1- from Ignition Coil -N152- -2-.
Checking ignition coils with ignition wires
- Disconnect spark plug connectors.
Vehicles with engine code AHA
- Measure resistance between the two spark plug connectors of an ignition coil.
Specified value: 18 to 25 k
Vehicles with engine code ATQ
- Measure resistance between the two spark plug connectors of an ignition coil.
Specified value: 16 to 27 k
Continuation for all vehicles
- Repeat test on other two ignition coils.
If specified values are not obtained:
- Pull ignition wires off ignition coils.
Vehicles with engine code AHA
- Test resistance of ignition wires.
Specified value: 4 to 6 k
Vehicles with engine code ATQ
- Test resistance of ignition wires.
Specified value: 3 to 7 k
Continuation for all vehicles
If specified values are not obtained:
- Replace the respective spark plug connectors with the ignition wires.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
If specified values are obtained:
- Check secondary resistance of ignition coils.
Specified value: 8 to 14 k
If specified values are not obtained:
- Replace Ignition Coil -N152-, item 6 .
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
If specified values are obtained:
Checking voltage supply
- Pull connectors -1- off connection -2- of all fuel injectors.
- Connect multimeter to terminals 1 + 2 of the disconnected connector for voltage measurement.
- Operate starter
Specified value: at least 11.5 V
- Switch ignition off.
If there is no voltage:
- Check wire between 5-pin connector terminal 1 and relay carrier for open circuits according to wiring diagram.
Wire resistance: max: 1.5 Ohms
- Check for open circuit in wire between 5-pin connector terminal 2 and Ground (GND) according to wiring diagram.
Wire resistance: max: 1.5 Ohms
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
If specified values are obtained:
Checking activation
- Pull connectors -1- off connection -2- of all fuel injectors.
- Connect V.A.G 1527 voltage tester to terminals 2 + 3 of connector.
- Operate starter and test ignition signal from Engine Control Module (ECM).
LED should flicker.
- Repeat test between terminals 2 + 4 and 2 + 5.
If LED does not flicker:
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test
Vehicles with engine code AHA
- Check wires between test box and 5-pin connector for open circuit according to wiring diagram.
Terminal 3 + socket 71
Terminal 4 + socket 78
Terminal 5 + socket 70
Wire resistance: max: 1.5 Ohms
Vehicles with engine code ATQ
- Check wires between test box and 5-pin connector for open circuit according to wiring diagram.
Terminal 3 + socket 102
Terminal 4 + socket 103
Terminal 5 + socket 94
Wire resistance: max: 1.5
Continuation for all vehicles
- Also check wires for short circuit to each other.
Specified value: Infinity Ohms
If no malfunctions are found in wires and there was voltage between terminals 1 + 2:
- Replace Engine Control Module (ECM).
If voltage supply and activation are OK:
- Replace Ignition Coil -N152-, item 6 .
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes