Suzuki RM-Z250 Service Manual page 288

15-16 ELECTRICAL SYSTEM
CKP SENSOR AND CRANKSHAFT ROTATION
SIGNAL SENSOR RESISTANCE
• Disconnect the magneto lead wire coupler.
• Measure the resistance between the lead wires using the
multi circuit tester. If the resistance is not within the specified
value, replace the stator with a new one.
 CKP sensor resistance: 80 – 120 Ω (Red – Green)
Crankshaft rotation signal sensor resistance:
 09900-25008: Multi circuit tester set
 Tester knob indication: Resistance (Ω)
ENGINE STOP SWITCH
• Remove the seat, radiator covers and fuel tank.
(5-2, 13-2, -3)
• Disconnect the engine stop switch lead wire coupler 1.
• Measure the engine stop switch resistance between B/Y lead
wire and B/W lead wire.
 Engine stop switch resistance:
 09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
 Tester knob indication: Resistance (Ω)
If the measurement is out of the specification, the cause may lie
in the engine stop switch.
If the measurement is within the specification, check the continu-
ity between the engine stop switch coupler and ECM coupler.

Normally, use the needle-point probe to the backside
of the lead wire coupler to prevent the terminal bend
and terminal alignment.
0.1 – 0.8 Ω (B/R – R/W)
ON: Under 1 Ω (B/Y – B/W)
OFF: ∞ Ω (Infinity) (B/Y – B/W)
R/W
G
B/Y B/W
B/W
B/Y
ECM coupler (Harness side)
B/R
R