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Home >> Mercedes Benz >> 1987 >> 190E 2.3 (201.028) L4-2.3L (102.985) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Component Tests >> Lambda Control Test

Lambda Control Test


Test Data
On-off ratio at idle speed 50% ± 10 and needle oscillation


Special Tools




On-board diagnostic readout via on-off ratio tester
- Various components of the CIS-E injection system are checked via the microprocessor in the CIS-E control unit.

- The failure codes are transmitted via the lambda measuring circuit of the diagnostic socket and are shown on the on-off ratio tester.

- The fixed on-off ratio indicates possible malfunctions.





N3 CIS-E control unit
P On-off ratio tester
x11 Diagnostic socket

Test Procedure:






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