Preconditions for the test:
Engine idling.
No faults stored.
No leaks in the exhaust system.
Engine temperature above 80 °C.
All electrical loads switched off.
Automatic gearbox set to ”P/N”.
Note:
Used to check idling.
Idling, ignition advance/retard and CO value are not adjustable.
The idling speed is set by the control unit.
The position of the distributor has no effect on ignition advance/retard.
The CO value is controlled by the lambda regulation.
In the basic setting mode, the carbon canister valve is closed.
Procedure:
Choose the idling check function.
Rev up the engine and let it idle for two minutes.
Read off the engine speed signal. Prescribed value 800-880 rpm.
Read off the lambda correction factor. Prescribed value 1.00 ± 0.3 (oscillates).
Read off the ignition advance setting. Prescribed value 1-15 < ° before TDC.