SAFETY PRECAUTIONS
To reduce the risk of personal injury and/or damage to the fuel injection and ignition system, always observe the following
- Do not touch or disconnect ignition coils with power output stages when the engine is running or turning at starting speed.
- The ignition must be turned off before connecting or disconnecting injection and ignition system wiring or tester cables.
- If engine is to be cranked at starting speed without starting
Using the assembly tool -T10118-, disconnect the connectors from the ignition coils 1 through 6.
Scheme 10
If special testing equipment is required during a road test, note the following
- Test and measuring instruments must be secured to the rear seat and operated by a second person from this location.
If the vehicle is involved in a collision while testing and measuring equipment is operated from the front passenger seat, the person sitting in that seat could be seriously injured when the airbag deploys.
IGNITION SYSTEM
- Only the components which specifically relate to the ignition system are dealt with here.
- For trouble free operation of the electrical components a voltage of at least 11.5 volts is necessary.
- It is possible that the control module will recognize a malfunction and store a Diagnostic Trouble Code (DTC) during some tests. After completing all tests and repairs, check the DTC memory and erase it if necessary. Refer to "Guided Function" in the vehicle diagnostic tester.
- If the engine only starts briefly and then turns off again after troubleshooting, repairs or checking of the components, it may be that the immobilizer is blocking the Engine Control Module (ECM). The ECM may have to be adapted then, refer to "Guided Functions" in the vehicle diagnostic tester.
IGNITION COILS WITH POWER OUTPUT STAGES
Special tools and workshop equipment required
- Assembly Tool -T10118
- Puller for Ignition Coil -T10095 A
- Special Lubricant -G 052 141 A2
Removing
Unclip the connector strip cover.
Place the assembly tool -T10118- against the release button -arrow-, and carefully remove the connector from the respective ignition coil with power output stage.
Scheme 11
From the straight side of the connector, push the puller for ignition coil -T10095 A- on in the -direction of the arrow-, and pull out the ignition coil with power output stage.
Scheme 12
Installing
Note. The ignition coils with power output stages must be greased with special lubricant -G 052 141 A2- to install the new spark plugs. This prevents the sealing hose on the ignition coil from sticking on the spark plug. The special lubricant must spread onto the spark pug when installing the ignition coil. New ignition coils with power output stages are already lubricated when delivered.
Apply a thin bead of special lubricant -G 052 141 A2- around the ignition sealing hose -arrow-. The bead must be 1 to 2 mm thick.
Scheme 13
To install, insert the ignition coil with power output stage into the corresponding spark plug shaft so that the straight connector sides fit with each other -arrows-.
Scheme 14
Slide on the puller for ignition coil -T10095 A- from the straight connector side in the -direction of the arrow- and press the ignition coil with power output stage onto the spark plugs.
