With Generic Scan Tool

Ignition Coils With Power Output Stage, Checking

Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1527 voltage test lamp
- VAG1594 connector test kit
- Wiring diagram

Test requirements
- The respective fuses of ignition coils must be OK.
- Fuel Pump (FP) Relay -J17- must be OK.
- 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. Engine Speed (RPM) Sensor -G28-, Checking
- Camshaft Position (CMP) sensor must be OK.
- Ignition switched off.

Test sequence







- Disconnect the 4-pin harness connector -1- at the ignition coil -2-.
- Measure supply voltage between terminals 1 + 2 and 1 + 4 of disconnected connector using the multimeter and adapter cables from the VAG1594 connector test kit.
- Switch on ignition.
Specified value: at least 11.5 V
- Switch ignition off.

If there is no voltage:
- Check wire between 4-pin connector terminal 1 and relay carrier for open circuits according to wiring diagram.
Wire resistance: max: 1.5 Ohm
- Check wires between 4-pin connector and Ground (GND) for open circuit according to wiring diagram.
Terminal 2 and Ground (GND)
Terminal 4 and Ground (GND)
Wire resistance: max: 1.5 Ohm

If there is no malfunction in voltage supply:

Checking activation
- Remove fuses for voltage supply of fuel injectors.







- Using adapter cables from the VAG1594 connector test kit, connect VAG1527 voltage tester to terminals 2 + 3 of disconnected connector.
- Operate starter and test ignition signal from Engine Control Module (ECM).
LED should flicker.
- Switch ignition off.

If LED flickers and voltage supply is OK:
- Replace ignition coils with power output stage

If LED does not flicker:
- Check wires

Checking wiring
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test







- Check wires between test box and 4-pin connector for open circuit according to wiring diagram.
Cylinder 1 terminal 3 + socket 102
Cylinder 2 terminal 3 + socket 95
Cylinder 3 terminal 3 + socket 103
Cylinder 4 terminal 3 + socket 94
Wire resistance: max: 1.5 Ohm
- Check wires for short circuit to each other.

If there is no malfunction in wire connections:
- Replace Engine Control Module (ECM).