190E 2.3 (201.024) L4-2.3L (102.961) (1984)
6 Run engine to warm up oil to 80°C.
7 Test idle speed (see table).
Note: If idle speed varies, test electronic idle speed control. See: Idle Speed/Testing and Inspection
8 Test lambda control (see table).
Note: The readout must fluctuate during the measurement. If a constant readout is indicated, there is a fault in the lambda control, e.g. oxygen
sensor faulty. See "Testing electrical components of CFI system" for trouble diagnosis table. See: Powertrain Management/Fuel Delivery and Air
Induction/Testing and Inspection/Testing Electrical Components of CFI System
Voltage measurement with multimeter or lambda control tester (12 volt position) at contact 3 of diagnostic connector to ground.
Test value: 2.1-4.8 volts
Switch off all ancillary components. Detach heated oxygen sensor signal plug connection (G3/2x2). Take reading of control value (e.g. 3.3
volts). Readout must not fluctuate.
Plug together heated oxygen sensor signal plug connection (G3/2x2) - readout fluctuates. Test value must vary not more than ±0.8 volts from
control value. Variation >0.8 volts, set control value.