Honda BF135A Manual page 226

Is the measured voltage 4.75 – 5.25V?
YES – Perform "4. CKP sensor signal line short cir-
cuit check".
NO – Repair open in the wire between the CKP
sensor and the ECM.
4. CKP sensor signal line short circuit check
-1. Turn the ignition switch OFF. Check for the continuity
between the No. 3 (Blue) terminal of the CKP sensor
harness side 3P connector and the engine ground.
CKP SENSOR HARNESS
SIDE 3P CONNECTOR
VIEWED FROM THE TERMINAL SIDE
Is there the continuity?
YES – Perform "5. CKP sensor ground line open cir-
cuit check".
NO – Repair open in the wire between the CKP
sensor and the ECM.
5. CKP sensor ground line open circuit check
-1. Check for the continuity between the No. 2 (Green/
Black) terminal of the CKP sensor harness side 3P
connector and the engine ground.
CKP SENSOR HARNESS
SIDE 3P CONNECTOR
VIEWED FROM THE TERMINAL SIDE
Is there the continuity?
YES – Perform "6. CKP sensor check".
NO – Repair open in the wire between the CKP
sensor and the ECM.
5-73
CRK (BLUE)
LG1
(GREEN/BLACK)
6. CKP sensor check
-1. Reset the ECM.
-2. Start the engine and let it run at idling under no load.
Check the MIL.
Does the MIL come ON?
YES – Replace the CKP sensor and recheck. If the
MIL comes ON again, substitute a known-
good ECM and recheck.
NO – End of the check.
BF135A•BF150A