Troubleshooting program The following troubleshooting program contains all faults which can be recognised by EDC diagnosis. The order corresponds to the numerical sequence of the flash code, irrespective of the significance of the fault. It is therefore not arranged on the basis of “fault is indicated by EDC indicator lamp” or “fault is not indicated by EDC indicator lamp”. The entire fault code memory should always be read out and all stored fault codes noted down before starting the engine test. This is important because lines or components need to be disconnected during troubleshooting in the system this can cause the corresponding fault codes to be set and stored.
For this reason, the fault code memory should always be deleted after intermedi- ate checks. The “check lines” test step must always be worked through as follows: Break or contact resistance Setpoint: approx. 0 Ω Short to negative Setpoint: Short to positive Setpoint: Short to adjacent lines Setpoint: Loose contacts After rectifying faults and checking, repeat test and delete fault code memory. All checks which refer to the control unit plug connector are conducted with the aid of the socket box. The pin designations at the control unit plug connector are identical to those of the test sockets on the socket box. Note:
The connection to the control unit must be disconnected at the socket box when conducting resistance measurements. 35