SPIN TRAINER: Service & Maintenance Manual - rev. 2.0
Page 6.15
Follow the procedure step by step to correctly diagnose the problem. Take particular care with the
checks highlighted by the circled numbers, which are described in detail below:
WARNING: Carry out all these operations with the alternator in rotation.
(1) Place the tester probes between pins 1 (+12V) and 3 (ground) of connector K2 of the fan
control board: the measured voltage should be +12Vdc.
(2) Place the tester probes between pins 3 (signal) and 2 (ground) of connector K1 on the fan
control board: the measured voltage should be +5Vdc.
(3) Place the tester probes between pins 4 (signal) and 2 (ground) of connector K1 of the fan
control board: the measured voltage should be +12Vdc. Place the tester probes between pin 1
(signal) and 2 (ground) of connector K3 on the fan control board: the measured voltage should
be +12Vdc.
(4) Place the tester probes between pins 1 (signal) and 12 (ground) of connector CN1 on the CPU
board: the measured voltage should be +12Vdc.
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