With Manufacturer's Scan Tool

Ignition Coils With Output Stage, Checking


NOTE:
- Ignition coils and final output stages are one component and cannot be replaced individually.
- The ignition coil primary resistance cannot be measured.


Special tools and equipment
- Test box V.A.G 1598/31
- Hand multimeter V.A.G 1526 or multimeter VAG 1715
- Adapter set V.A.G 1594
- Diode test lamp V.A.G 1527 B
- Wiring diagram

Check conditions
- Battery voltage at least 11.5 V
- Engine speed sender OK Testing and Inspection
- Camshaft Position (CMP) sensor must be OK Testing and Inspection







- All fuses must be OK.

Checking voltage supply







- Disconnect 6-pin connector from ignition coils with power output stage (N70, N127, N291, N292) -arrow-.







- Using multimeter and adapter cables from V.A.G 1594, measure supply voltage between terminals 1 + 6 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 6-pin connector terminal 6 and Motronic current supply relay (J271) using wiring diagram.
Wire resistance: max. 1.5 Ohms
- Check wire between 6 pin connector terminal 1 and Ground (GND) for open circuit according to wiring diagram.
Wire resistance: max. 1.5 Ohms

If there is no fault 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.


- Disconnect 6-pin connector from ignition coils with power output stage (N70, N127, N291, N292) -arrow-.







- Connect diode test lamp V.A.G 1527 with adapter cables from V.A.G 1594 to:
- Terminals 1 + 2 (ignition output 1)
- Terminals 1 + 3 (ignition output 2)
- Terminals 1 + 4 (ignition output 3)
- Terminals 1 + 5 (ignition output 4)
of disconnected connector.

- Get a 2nd person to operate starter and check ignition signal from engine control module. LED must flicker
- Switch ignition off.

If the LED flickers and there is voltage between terminals 2 + 6:
- Replace ignition coils with power output stage.

LED does not flicker:
- Remove inner plenum chamber cover, left:







- Connect test box V.A.G 1598/31 to control module wiring harness. Engine control module is not connected by this action.







- Check wiring between test box and 6-pin connector for open circuit using wiring diagram.
- Cylinder 1 terminal 2 + socket 102
- Cylinder 2 terminal 3 + socket 95
- Cylinder 3 terminal 4 + socket 103
- Cylinder 4 terminal 5 + socket 94
Wire resistance: Max. 1.5 Ohms
- Additionally check wires for short to one another and to positive and Ground (GND).
Specification: Infinity Ohms

If no wiring fault is detected and voltage was present between terminals 1 + 6:
- Replace engine control module.