On the FENDT 900 COM III series, as on all other COM III tractors, the starter is controlled by means of the A051 – ECU,engine control unit (EDC 7)..
When all input signals are present, the K065 – Starter relay is energised by the A051 – ECU, engine control unit (EDC 7)..
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Start signals include:
– Supply voltage at terminals 30, 15, 31
S012 – Switch, starter lockout +UB at pin 66
S002 – Switch, ignition terminal 50a +UB at pin 74
During the start process, the A051 – ECU, engine control unit (EDC 7). also requires the following signals:
– Start quantities released by the immobiliser control unit via the G bus
– A speed signal from the B085 – Camshaft speed sensor or the B088 – Crankshaft speed sensor
NOTE: If the A051 – ECU, engine control unit (EDC 7). does not detect a speed signal after about 5 seconds, the start process is aborted.
The start process is aborted for the following reasons:
– Without a speed signal, the A051 – ECU, engine control unit (EDC 7). cannot classify the rotational speed of the engine, speed control
– Without a speed signal, the A051 – ECU, engine control unit (EDC 7). cannot assign the injection time
B085 – Camshaft speed sensor TDC cylinder 1 ignition, or
B088 – Crankshaft speed sensor TDC cylinder 1/6
