Honda BF40D Mode D'emploi page 418

• CKP SENSOR 1 TROUBLESHOOTING
DTC 4-1: No CKP sensor 1 pulse
1) Symptom reproduction test
a. Turn the combination switch OFF. Disconnect the
CKP sensor 1 3P connector
it again.
b. Clear the DTC (P. 5-12).
• Continue the procedure when the DTC does not
clear.
c. Start the engine and check the DTC using the HDS
(Dr. H or pocket tester).
Does the DTC 4-1 appear?
YES - Go to "2) CKP sensor 1 power line open-
circuit inspection."
NO - Temporary failure (Disappears.)
2) CKP sensor 1 power line open-circuit inspection
a. Turn the combination switch OFF and disconnect
the CKP sensor 1 3P connector
b. Turn the combination switch ON. Measure the
voltage between the CKP sensor 1 3P connector
main wire harness side No.3 (Yellow/Black)
13
terminal and the engine ground
CKP SENSOR 1 3P CONNECTOR
MAIN WIRE HARNESS SIDE
IGP2
(Yellow/Black)
VIEWED FROM THE TERMINAL SIDE
5-23
once and connect
13
.
13
13
418
Is there the battery voltage?
YES - Go to "3) CKP sensor 1 signal line open-
circuit inspection."
NO - Check the No.6 fuse and the main relay
(P. 18-17, 18). If there is no problem, replace
the main wire harness.
3) CKP sensor 1 signal line open-circuit inspection
• Measure the voltage between the CKP sensor 1 3P
connector main wire harness side No.1 (Blue)
13
terminal and the engine ground.
CKP SENSOR 1 3P CONNECTOR
MAIN WIRE HARNESS SIDE
13
VIEWED FROM THE TERMINAL SIDE
Is the measurement within 4.75 - 5.25V?
YES - Go to "4) CKP sensor 1 signal line short-
circuit inspection."
NO - Repair open in the main wire harness
between the ECM and the CKP sensor 1.
CRK1 (Blue)