With Manufacturer's Scan Tool

Ignition Coils With Output Stage, Checking

Special tools, test equipment and auxiliary items







- V.A.G 1598/31 test box
- V.A.G 1526 A or Fluke 83 multimeter
- V.A.G 1594 C adapter set
- V.A.G 1527 B diode test lamp
- Removal tool T40039
- Wiring diagram

Check conditions







- All fuses must be OK.
- Battery voltage must be at least 11.5 V.
- Camshaft Position (CMP) sensor 2 -G163- must be OK. Testing and Inspection
- Engine speed sensor must be OK, checking. Testing and Inspection

NOTE: Ignition coils and final output stages are one component and cannot be replaced individually.

Test sequence

Checking voltage supply






- Disconnect 4-pin connector -2- from ignition coil to be checked -1-.
- Using multimeter and adapter cables from V.A.G 1594 C measure supply voltage between contacts 1 + 2 and 1 + 4 of disconnected connector.
- Switch ignition on.
- Specification: Min. 11.5 V
- Switch ignition off.

If no voltage is present:







- Check wiring for open circuit between 4-pin connector contact 1 and current supply relay for Motronic (main relay) using wiring diagram.
Wire resistance: max. 1.5 Ohms
- Check wiring between 4-pin connector and Ground for open circuit using wiring diagram.

Contact 2 and Ground
Contact 4 and Ground

Wire resistance: Max. 1.5 Ohms

If there is no malfunction in the supply voltage:
- Check activation.

Checking activation

WARNING: During the following test do not touch the connecting parts of the ignition coils or test cables.







- Remove fuse 32.

NOTE: Removing fuse 32 interrupts the voltage supply to the injectors.







- Connect V.A.G 1527 B diode test lamp with adapter cables from V.A.G 1594 C to Contacts 2 + 3 of disconnected connector.
- Operate starter and check ignition signal from engine control module.

LED must flicker

- Switch ignition off.
- When the LED flickers and the supply voltage is OK.
- Using removal tool T40039, replace ignition coils with output stage.
- Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory. DTC Memory, Checking and Erasing (Functions 02 and 05)
- Read readiness code. If DTC memory has been erased or engine control module was disconnected from permanent positive, readiness code must be generated again.
Monitors, Trips, Drive Cycles and Readiness Codes
Monitors, Trips, Drive Cycles and Readiness Codes

If LED does not flicker:
Check wiring.

Checking wiring







- Connect V.A.G 1598/31 test box to control module wiring harness. Engine control module remains disconnected.







- Check wiring between test box and 4-pin connector for open circuit using wiring diagram.

Cylinder 1 contact 3 + socket 102
Cylinder 2 contact 3 + socket 95
Cylinder 3 contact 3 + socket 103
Cylinder 4 contact 3 + socket 94

Wire resistance: Max. 1.5 Ohms

- Check wires for short to one another.

If no malfunction can be found in the wiring:
- Replace engine control module.