87
12/04
B
F. 63
Reconnect the rpm/speed sensor connector.
Repeat the check by using the testing wiring
across PIN 7 - PIN 12.
PIN 7 - PIN 12 = 680
Ω
Ω
Ω
Ω
Ω
± 15 %
The value should approach the value measured
by the sensor.
Higher or infinitive resistance.
Check connectors with care. Disconnect the brown
cable and check it for interruption across the central
unit PIN 7, the sensor PIN 2 and for the white cable
interruption across the central unit PIN 12 and the
sensor PIN 1.
Restore the interrupted cable.
Resistance= 0
Ω
Ω
Ω
Ω
Ω
. Restore
or replace the connections
(short-circuit).
Check again for the insulation from the ground.
7-23 = infinitive (>1M
Ω
Ω
Ω
Ω
Ω
).
Check the sensor and central unit
connectors.
Repair or replace the connections.
Disconnect spark plug cap.
Measure the alternating current across the PIN 7
and the PIN 12 with the engine idling speed.
PIN 7 - PIN 12 = 0,8 ÷ 4,5 V~
Rpm = ~300 ÷ 400 G/1'
The sensor circuit operation is normal.
If the start-up anomaly persists, replace the
central unit.
NOTE - During the repair interventions, make sure to connect the sensor cable properly.
- Do not force the cable.
- A bad quality shielding of the cable may affect the engine operation at the higher speeds.
Check the air gap and the sensor magnetic
activity.
See chapter THERMAL UNIT AND TIMING
(Engine Manual).
In case the magnetic activity is zero,
replace the sensor.
SPIDER MAX 500
F. 64
680
Ω
Ω
Ω
Ω
Ω
± 15 %
0,8 ÷ 4,5 V ~
