Description of On-Board Diagnostics

With fault diagnosis by measuring on/off ratio




Effective 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