63" (P01771) Crankshaft Rotation Signal Circuit Malfunction - Suzuki RM-Z250 Service Manual

12-58 FI SYSTEM DIAGNOSIS

"63" (P01771) CRANKSHAFT ROTATION SIGNAL CIRCUIT MALFUNCTION

DETECTED CONDITION
CKP sensor (pick-up coil) signal is produces, but sig-
nal from crankshaft rotation signal sensor is not
input for 3 seconds or more.
Crankshaft rotation signal sensor

When using the multi circuit tester, do not strongly touch the terminal of the ECM coupler with
a needle-pointed tester probe to prevent the terminal damage or terminal bend.
NOTE:
After repairing the trouble, clear the DTC using SDS tool. (12-21)
INSPECTION
Step 1
1) Stop the engine.
2) Check the crankshaft rotation signal sensor coupler 1 for
loose or poor contacts.
If OK, then measure the crankshaft rotation signal sensor
resistance.
3) Disconnect the crankshaft rotation signal sensor coupler and
measure the resistance.
 Crankshaft rotation signal sensor resistance:
R/W
B/W
B/R
0.1 – 0.8 Ω (B/R – R/W)
POSSIBLE CAUSE
• Metal particles or foreign material being stuck on
the crankshaft rotation signal sensor and rotor tip.
• Crankshaft rotation signal sensor circuit open or
short.
• Crankshaft rotation signal sensor malfunction.
• ECM malfunction.
B
1
1
ECM
SIG