TOHATSU BFT75A Service Manual page 165

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FUEL SYSTEM
2. CKP sensor power line open circuit inspection
Turn the combination switch OFF and disconnect
the CKP sensor 3P connector
Turn the combination switch ON.
Measure the voltage between the CKP sensor 3P
connector
(Yellow/Black) terminal and engine ground.
Does battery voltage exist?
YES
NO
3. CKP sensor signal line open or short circuit/
GND line open circuit inspection
Measure the voltage between the CKP sensor 3P
connector
terminal and No.2 (Green/Black) terminal.
Is the measurement within 4.75 – 5.25 V?
YES
NO
DTC 4-2 (ABNORMAL CKP SENSOR PULSE)
1. Symptom reproduction test
Disconnect the CKP sensor 3P connector
ECM connector A
Clear the DTC (page 5-5).
• Continue the procedure if the DTC does not
clear.
Start the engine and check the DTC using the Dr.H.
Does the DTC 4-2 appear?
YES
NO
2. Crank pulser plate inspection
Turn the combination switch OFF.
Check the crank pulser plate.
(page 7-13).
Is the crank pulser plate correct?
YES
NO
5-24
main wire harness side No.3
– GO TO STEP 3.
– Repair open in the Yellow/Black wire. If
main wire harness is normal, inspect the
No.5 fuse circuit in the fuse box.
main wire harness side No.1 (Blue)
– Replace the CKP sensor with a new one
and recheck.
– • Repair open or short in the Blue wire.
• Repair open in the Green/Black wire.
• If the main wire harness is normal,
replace the ECM with a new one, and
recheck.
, and joint connector 1
, and then reconnect them.
– GO TO STEP 2.
– Temporary failure (disappears)
– Replace the CKP sensor with a new one
and recheck. If the CKP sensor is
replaced, but DTC 4-2 still appears,
replace the ECM with a new one and
recheck.
– Replace the alternator rotor and recheck.
.
CKP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
IGP2
(Yellow/Black)
CKP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
LG1
(Green/Black)
,
CRK
(Blue)