Honda BF40D Mode D'emploi page 461

3) ECT sensor signal line short-circuit inspection
• Turn the combination switch OFF. Disconnect the
ECM connector A . Check for continuity between
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the ECT sensor 2P connector
side No.1 (Red/Black) terminal and the engine
ground.
ECT SENSOR 2P CONNECTOR
MAIN WIRE HARNESS SIDE
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VIEWED FROM THE TERMINAL SIDE
Is there continuity?
YES - Repair short in the main wire harness
between the ECM and the ECT sensor.
NO - Go to "4) ECT sensor GND line open-circuit
inspection."
4) ECT sensor GND line open-circuit inspection
• Connect the ECM connector A
continuity between the ECT sensor 2P connector
main wire harness side No.2 (Green/Red)
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terminal and the engine ground.
ECT SENSOR 2P CONNECTOR
MAIN WIRE HARNESS SIDE
SG2
(Green/Red)
VIEWED FROM THE TERMINAL SIDE
Is there continuity?
YES - Go to "5) ECT sensor inspection."
NO - Repair open in the main wire harness
between the ECM and the ECT sensor.
5) ECT sensor inspection
main wire harness
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ECT SENSOR 2P CONNECTOR
ECT SENSOR SIDE
TOH (Red/Black)
. Check for
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461
• Disconnect the ECT sensor. Measure the resistance
between the ECT sensor side No.1 terminal and No.2
terminal of the ECT sensor 2P connector
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TOH SG2
AMBIENT TEMPERATURE
VIEWED FROM THE
TERMINAL SIDE
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.
.
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