Honda Motor BF40D Manual Del Usuario página 426

• IAT SENSOR TROUBLESHOOTING
DTC 10-1: IAT sensor voltage is too low
1) Symptom reproduction test
a. Turn the combination switch OFF. Disconnect the
IAT 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 IAT
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) IAT sensor signal line short-circuit
inspection."
2) IAT sensor signal line short-circuit inspection
a. Turn the combination switch OFF. Disconnect the
ECM connector B
10
connector .
1
b. Check for continuity between the IAT sensor 2P
connector main wire harness side No.1
1
(Red/Yellow) terminal and the engine ground.
IAT SENSOR 2P CONNECTOR
MAIN WIRE HARNESS SIDE
1
VIEWED FROM THE
TERMINAL SIDE
5-31
once and connect it
1
and the IAT sensor 2P
TA (Red/Yellow)
426
Is there continuity?
YES - Repair short in the main wire harness
between the ECM and the IAT sensor.
NO - Go to "3) IAT sensor inspection."
3) IAT sensor inspection
a. Connect the ECM connector B
sensor 2P connector
1
b. Turn the combination switch ON and measure the
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 IAT sensor with a new one and
recheck.
and the IAT
10
.