STEPRACE: Service & Maintenance Manual - rev. 1.2
Page 6.10
Follow the procedure step by step to correctly diagnose the problem. Take particular care with the
checks highlighted by circled numbers, which are described in detail below:
(1) Check whether the black and violet wires, which connect the alternator to pins 1 and 5 of CN2
on the alternator interface board, are correctly connected.
(2) Place the probes of an oscilloscope between the violet wire and the alternator ground. When
the speed is varied, the waveform frequency should vary as shown in the table below:
SPM FREQUENCY
(Hz)
60 187
70 218
80 249
(3) As for step (2) but with the oscilloscope probes between pins 1 (probe) and 5 (ground) of
connector CN2 on the alternator interface board.
(4) As for step (2) but with the oscilloscope probes between pins 5 (probe) and 3 (ground) of
connector CN1 on the alternator interface board.
(5) As for step (2) but with the oscilloscope probes between pins 5 (probe) and 3 (ground) of
connector CN1 on the display CPU board.
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