Honda BF40D Mode D'emploi page 434

• ECT SENSOR TROUBLESHOOTING
DTC 140-1: ECT sensor voltage is too low
1) Symptom reproduction test
a. Turn the combination switch OFF. Disconnect the
ECT sensor 2P connector
again.
b. Clear the DTC (P. 5-12).
• Continue the procedure when the DTC does not
clear.
c. Turn the combination switch ON. Measure the ECT
sensor voltage using the HDS (Dr. H or pocket
tester).
Is the measurement within 0.078 - 4.92V?
YES - Temporary failure (Disappears.)
NO - Go to "2) ECT sensor signal line short-circuit
inspection."
2) ECT sensor signal line short-circuit inspection
a. Turn the combination switch OFF. Disconnect the
ECM connector A
9
connector .
11
b. Check for continuity between the ECT sensor 2P
connector main wire harness side No.1
11
(Red/Black) terminal and the engine ground.
ECT SENSOR 2P CONNECTOR
MAIN WIRE HARNESS SIDE
11
VIEWED FROM THE
TERMINAL SIDE
5-39
once and connect it
11
and the ECT sensor 2P
TOH
(Red/Black)
434
Is there continuity?
YES - Repair short in the main wire harness
between the ECM and the ECT sensor.
NO - Go to "3) ECT sensor inspection."
3) ECT sensor inspection
a. Connect the ECM connector A
ECT sensor and connect the ECT sensor 2P
connector .
11
b. Turn the combination switch ON and measure the
ECT sensor temperature using the HDS (Dr. H or
pocket tester).
Does the measurement correspond to the ambient
temperature?
YES - Replace the ECM with a new one and
recheck.
NO - Replace the ECT sensor with a new one and
recheck.
. Remove the
9