Engine General Information and Diagnosis: 1A-54
C21 (Use of mode select switch)
Step Action Yes No
1 1) Turn the ignition switch OFF.
2) Lift and support the fuel tank. Refer to “Fuel Tank
Removal and Installation in Section 1G (Page 1G-7)”.
3) Check the IAT sensor coupler (1) for loose or poor
contacts.
If OK, then measure the IAT sensor input voltage.
4) Disconnect the IAT sensor coupler and turn the ignition
switch ON.
5) Measure the input voltage between the Dg wire “A” and
ground.
If OK, then measure the input voltage between the Dg
wire “A” and B/Br wire “B”.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Voltage ( )
IAT sensor input voltage
4.5 – 5.5 V
((+) terminal: Dg – (–) terminal: Ground, (+) terminal:
Dg – (–) terminal: B/Br)
6) If OK, then check there is IAT sensor lead wire no
continuity.
7) Turn the ignition switch OFF.
Go to Step 2. Short circuit in the Dg
wire or B/Br wire.
1
I944H1110039-01
(A)
“A”
“B”
I944H1110173-01
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