TOHATSU BFT115A Service Manual page 144

FUEL SYSTEM
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
Turn the combination switch OFF.
Disconnect the CKP sensor 3P connector
ECM connector A
29
Clear the DTC (page 5-6).
• Continue the procedure if the DTC does not
clear.
Start the engine and check the DTC using the HDS.
Does the DTC 4-2 appear?
YES
NO
2. CKP sensor installation inspection
Turn the combination switch OFF.
Check the installation of the CKP sensor (page 5-
118).
Is the CKP sensor installation correct?
YES
NO
5-26
main wire harness side No.1 (Blue)
9
– 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
12
, and then reconnect them.
– GO TO STEP 2.
– Temporary failure (disappears)
– Replace the CKP sensor with a new one
and recheck. If the CMP sensor is
replaced, but DTC 4-2 still appears,
replace the ECM with a new one and
recheck.
– Install the CKP sensor properly, and
recheck.
CKP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
LG1
(Green/Black)
,
9
9
CRK
(Blue)