Ignition Coils, Checking

Ignition Coils, Checking

Special Tools and Equipment







- VAG1526A
- VAG1527B
- VAG1594A
- VAG1598/31


NOTE:
- Ignition coils and power output stage are a common part.
- Primary resistance of ignition coils cannot be measured.
- Secondary resistance must first be measured with the ignition wires connected to the ignition coils via the spark plug connectors of the corresponding cylinder (This measurement will include measurement of the shielded resistances of the ignition wires).


- Disconnect 5-pin connector from ignition coils.

Check ignition coils (-N-, -N128- and -N158-)
- Pull the ignition wires from the spark plugs.







- In order to perform a resistance measurement, connect multimeter between both spark plug connectors of the respective ignition circuit to be checked.
- Specification: each 16 to 27 kOhms
- If the specified values are not reached, disconnect ignition wires from ignition coils and perform a separate resistance measurement at the ignition wires and at the ignition coils.







- In order to perform a resistance measurement, connect multimeter between both ignition wire connectors connectors of the ignition coil to be checked.
- Specification: 8 to 14 kOhms
- In order to perform a resistance measurement, connect multimeter between both ignition wire connectors connectors of the ignition wire to be checked.
- Specification: 3 to 7 kOhms
- Replace faulty components if the specified values are not reached again.

Checking Ground (GND) supply of power output stage







- Connect VAG1527B voltage tester as follows:

Harness connector Terminal Measure to
2 B+

- LED must light up.

If LED does not light up:
- Check the wire connection for open circuit.
- Repair open circuit if necessary.

Checking voltage supply to ignition coils


NOTE: Voltage is supplied to ignition coils via Fuel Pump (FP) relay.


Test requirement:
- Fuse for ignition coils OK







- Connect VAG1527B voltage tester as follows:

Harness connector Terminal Measure to
1 Engine Ground (GND)

- Operate starter.
- LED must light up.

If LED does not light up:
- Check the wire connection for open circuit.
- Repair open circuit if necessary.

Checking activation
- Disconnect connectors from all six fuel injectors. (afterward check DTC memory)







- Connect VAG1527B voltage tester as follows:

Harness connector Terminal Measure to
3 Engine Ground (GND)
4 Engine Ground (GND)
5 Engine Ground (GND)

- Operate starter for a few seconds.
- LED must blink (brief blink signal).

If specified values are not obtained:
- Switch ignition off.
- Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. Refer to "Scan Tool Testing/Wire And Component Test Using VAG1598/31 Test Box", Testing and Inspection







- Check the following wire connections for open circuit and short circuit to Ground (GND) and B+:

Harness connector Terminal VAG1598/31 test box Socket
3 102
4 103
5 94

- Repair open circuit or short circuit if necessary.

If no malfunctions are found in wires:
- Replace Engine Control Module (ECM).