Engine General Information and Diagnosis: 1A-40
Step Action Yes No
1 1) Turn the ignition switch OFF.
2) Remove the front frame cover. (Refer to “Front Frame
Cover Removal and Installation in Section 9D (Page9D-
17)”.)
3) Check the IAT sensor coupler for loose or poor contacts.
If OK, then measure the IAT sensor voltage at the wire
side coupler.
4) Disconnect the coupler (1) and turn the ignition switch
ON.
5) Measure the voltage between B/Bl wire terminal and
ground.
6) If OK, then measure the voltage between B/Bl wire
terminal and B/Br wire terminal.
IAT sensor voltage
4.5 – 5.5 V
(Positive terminal: B/Bl – Negative terminal: Ground,
Positive terminal: B/Bl – Negative terminal: B/Br)
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Voltage ( )
Is the voltage OK?
Go to Step 2. • Loose or poor
contacts on the ECM
coupler (terminal (25)
and (4)). Refer to
“Terminal Alignment
of ECM Coupler
(Harness Side)
(Page1A-5)”.
• Open or short circuit
in the B/Bl wire or B/
Br wire.
1
I705H1110025-02
V
B/Bl
B/Br
(A)
I705H1110026-03
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