Check-list 4. Flash code diagnosis check EDC control unit connected Corrective measures Engine running: Check procedure Short–circuit rpm sensor; connect pin 21 to pin 13 to do this Diagnosis lamp lights up Engine speed is measured by auxiliary rpm sensor Disconnect connection between pin 21 and pin 13 Press diagnosis button for at least 3 seconds but no more than 10 seconds Check flash code (4x short = rpm sensor) Deleting the fault memory; do this by turning off ignition pressing diagnosis button, turning on ignition, pressing and holding button for at least 3 seconds but not longer than 10 seconds 5. Safety relay check EDC control unit connected Corrective measures Engine running:
Check procedure Disconnect pin 14 Engine should shut down after no more than 10 seconds 6. . Capacitance reserve check The power capacitance of the line leading to the control rod position transducer must not exceed the speci- fied maximum capacitance. The capacitance increases if the line is dirty or moist. This check is designed to establish how much capacitance reserve is still available. EDC control unit connected Corrective measures Check procedure Connect capacitance decade between pin 11 and pin 13 Connect additional capacitance until the engine no longer starts Record value Setpoint: >400 pF without wiring harness adapter (capacitance of wiring harness adapter approx.
100 pF, wiring harness dry at approx. 25 _ C) Deleting the fault memory After the checks have been completed, the fault memory must be cleared with MAN-Cats. No fault must be stored when the ignition” is turned on again. If this is not the case, the fault must be located and eliminated in accordance with the troubleshooting procedure. 25