Ignition System: Description and Operation
Ignition System
--> [ Engine Speed Sensor, Checking ] Engine Speed Sensor, Checking
--> [ Camshaft Position Sensor, Checking ] Camshaft Position Sensor, Checking
--> [ Camshaft Position Sensor 2, Checking ] Camshaft Position Sensor 2, Checking
--> [ Camshaft Adjustment Valve 1, Checking ] Camshaft Adjustment Valve 1, Checking
--> [ Camshaft Adjustment Valve 1 (exhaust) , Checking ] Camshaft Adjustment Valve 1 (Exhaust) , Checking
--> [ Knock Sensor 1, Checking ] Knock Sensor 1, Checking
--> [ Knock Sensor 2, Checking ] Knock Sensor 2, Checking
--> [ Ignition Coils with Power Output Stage, Checking ] Ignition Coils with Power Output Stage, Checking
Observe Safety Precautions:
View Spark Plug Test Data:
Check the Technical Bulletins for information that may supersede any information included in this service information.
• All manufacturers special tools as well as common tools may contain a manufacturer specific part number. These tools may be substituted with an equivalent aftermarket tool or are available for purchase.
• Manufacturers special tools as well as common tools that contain a manufacturer specific part number may be referenced in the test procedure illustrations showing the tool use or installation. If the manufacturer specific tool is not being used, an equivalent aftermarket tool may be installed in the same manner as the manufacturers special tool.
• The manufacturers test box is available for purchase or rental.
Safety Precautions
CAUTION!
Observe the following for all installations, especially in the engine compartment due to lack of room:
• Route lines of all types (e.g. for fuel, hydraulic, EVAP canister system, coolant and refrigerant, brake fluid, vacuum) and electrical wiring so that the original path is followed.
• Watch for sufficient clearance to all moving or hot components.
• Fuel system is under pressure! Before opening system, place rags around the connection point. Then release pressure by carefully loosening connection.
• Test equipment must always be secured to the rear seat and operated by a second person.
• Test and measuring equipment that is operated from the passenger seat, the person seated could be injured in the event of an accident involving deployment of the passenger-side airbag.
• Do not touch or disconnect ignition wires when engine is running or turning at starting RPM.
• Only disconnect and reconnect wires for injection and ignition system, including test leads, if the ignition is turned off.
CAUTION!
The use of nails, paper clips, or another unauthorized materials to back-probe electrical harness connectors is strictly prohibited and may cause damage to the electrical harness connectors, terminal ends or damage to a component. Use only the manufacturers test lead kit or an equivalent aftermarket test lead kit for back-probing all electrical harness connectors.
If engine is to be cranked at starting RPM without starting, e.g. for a compression test:
- Remove Fuse 6 (on fuse panel B) SB6 and Fuse 29 (on fuse panel B) SB29 from the fuse holder, E-box, plenum chamber.
By removing Fuse 6 (on fuse panel B) SB6, voltage supply of Ignition Coils with Power Output Stage (N70, N127, N291, N292, N323, N324) is interrupted, that of Fuel Injectors (N30, N31, N32, N33, N83, N84) by removing Fuse 29 (on fuse panel B) SB29.
Spark Plug Test Data
