Notes Regarding On-Board Diagnosis

Up to 12/85 (production date 552)
No fault detection integrated in CIS-E control unit.

It is not possible to enter the test routine through measuring the on/off ratio.

In this case, perform the same test procedure, without % readout, as models with On/Off ratio under "Diagnostic Trouble Code Test Procedures". On/Off Ratio Tester

From 12/85
Faulty input signals are detected by the CIS-E control unit (N3) and passed to the lambda test output. The faults detected can be output with the lambda control tester (012) at diagnostic socket (X11).

The fault detection facility enables various components of the CIS-E injection system to be tested by measuring the on/off ratio.

Detection of control units:
- Connect lambda control tester.
- Switch on ignition.

On/off ratio readout Control unit
70% with fault detection
100% without fault detection
85% California