With Manufacturer's Scan Tool
Ignition Coil With Power Output Stage, Checking
NOTE: The ignition coils and power output stage are combined into a single component and cannot be replaced separately.
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
- VAG 1526 Hand multimeter or VAG 1715 multimeter
- VAG 1527 LED test light
- VAG 1594 adapter set
- VAG 1598/31 test box
- Electrical Wiring Diagrams
Test prerequisites
- The fuses must be OK.
- The battery voltage must be at least 11.5 V.
- All electrical accessories, e.g. lights and rear window heating must be switched off.
- If the vehicle is equipped with air conditioning, this must be switched off.
- Motronic Engine Control Module (ECM) Power Supply Relay -J271- must be OK., checking:
- Engine speed sensor must be OK, checking.
Testing and Inspection
- Camshaft Position (CMP) Sensor must be OK, checking.
Testing and Inspection
Test sequence
- Remove fuse 29 from fuse holder.
NOTE: Removing fuse 29 interrupts the voltage supply to the fuel injectors.
- Remove engine cover.
- Pull connectors off ignition coils 1 to 6.
NOTE: Mark connector and component before pulling connector off.
Checking voltage supply
- Measure supply voltage between terminals 1 and 3, and 2 and 3 of disconnected connector using multimeter and adapter cables from V.A.G 1594.
- Switch on ignition.
Specification: at least 11.5 V
- Switch off ignition.
If no voltage is present:
- Check wire for open circuit between 4-pin connector terminal 3 and Motronic Engine Control Module (ECM) Power Supply Relay -J271- referring to Electrical Wiring Diagrams.
Wire resistance: max. 1.5 ohms
- Check wiring for open circuit between 4-pin connector and ground referring to Electrical Wiring Diagrams.
terminal 1 and ground
terminal 2 and ground
Wire resistance: max. 1.5 ohms
If there is no malfunction in the supply voltage:
- Check activation.
Checking activation
- Connect VAG 1527 LED test light using adapter cables from V.A.G 1594 to terminals 4 and engine ground of disconnected connector for cylinder 1.
- Operate starter and check ignition signal from Engine Control Module (ECM).
- The LED must flicker
- Repeat check at the fuel injector connectors for Cyls. 2 to 6.
- Switch off ignition.
When the LED flickers and the supply voltage is OK.:
- Replace relevant ignition coil with power output stage, item 2.
- Check DTC memory, repair malfunctions if necessary and then erase DTC memory. Refer to "Displaying and Reading Trouble Codes/With Manufacturer Scan Tool/DTC Memory Checking and Erasing".
Testing and Inspection
- Read readiness code. If the DTC memory has been erased or the Engine Control Module (ECM) was disconnected from battery positive, the readiness code must be generated again. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Reading Readiness Code".
Testing and Inspection.
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code".
Testing and Inspection
The LED does not flicker:
- Check wiring.
Checking wiring
- Remove wiper arms and cowl panel:
- Connect VAG 1598/31 test box to control module wiring harness. The Engine Control Module (ECM) remains disconnected.
- Check wiring for open circuit between test box and 4-pin connector referring to Electrical Wiring Diagrams. For:
Cylinder 1 terminal 4 and socket 102
Cylinder 2 terminal 4 and socket 110
Cylinder 3 terminal 4 and socket 94
Cylinder 4 terminal 4 and socket 111
Cylinder 5 terminal 4 and socket 103
Cylinder 6 terminal 4 and socket 95
- Wire resistance: max. 1.5 ohms
- Additionally check wires for short to one another.
Specification: infinity ohms
If no malfunction can be found in the wiring:
- Replace Engine Control Module (ECM). Refer to "Computers and Control Systems/Engine Control Module".
- Check DTC memory, repair malfunctions if necessary and then erase DTC memory. Refer to "Displaying and Reading Trouble Codes/With Manufacturer Scan Tool/DTC Memory Checking and Erasing".
Testing and Inspection
- Erase learned values and adapt Engine Control Module (ECM) again. Refer to "Computers and Control Systems/Engine Control Module".
- Read readiness code. If the DTC memory has been erased or the Engine Control Module (ECM) was disconnected from battery positive, the readiness code must be generated again. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Reading Readiness Code".
Testing and Inspection
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code".
Testing and Inspection