FI SYSTEM DIAGNOSIS 12-59
4) If OK, then check the continuity between each terminal and
ground.
Crankshaft rotation signal sensor resistance:
∞
Ω
(Infinity)
(B/R – Ground)
(R/W – Ground)
09900-25008: Multi circuit tester set
Tester knob indication: Resistance (
Ω
)
Are the resistance and continuity OK?
.
Step 2
1) Measure the crankshaft rotation signal sensor peak voltage
by depressing the kick starter several times forcefully.
2) Repeat the above test procedure a few times and measure
the highest peak voltage.
Crankshaft rotation signal sensor peak voltage:
3.5 V and more (
+
B/R –
-
R/W)
1
Peak volt adaptor
09900-25008: Multi circuit tester set
Tester knob indication: Voltage (
)
.
Is the voltage OK?
YES
Go to step 2.
NO
Replace the crankshaft rotation signal sensor with
a new one.
YES
• B/R or R/W wire open or short.
• Loose or poor contacts on the crankshaft rota-
tion signal sensor coupler or ECM coupler (ter-
minal
T
).
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
NO
• Inspect that metal particles or foreign material
stuck on the crankshaft rotation signal sensor
and rotor tip.
• If there are no metal particles and foreign mate-
rial, then replace the crankshaft rotation signal
sensor with a new one.
1
2
V
ECM coupler (Harness side)
2
