Engine General Information and Diagnosis: 1A-32
1 6) Disconnect the ECM coupler. Refer to “ECM Removal
and Installation in Section 1C (Page 1C-1)”.
7) Insert the needle pointed probes to the lead wire coupler.
8) Check the continuity between the R wire “A” and
terminal “6”. Also, check the continuity between the G/B
wire “B” and terminal “13”.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Continuity ( )
ECM coupler (Harness side)
Is the continuity OK?
Go to Step 2. R and G/B wire open, G/
B wire shorted to the
ground.
2 1) Turn the ignition switch OFF.
2) Connect the IAP sensor coupler.
3) Insert the needle pointed probes to the lead wire coupler.
4) Start the engine at idle speed and measure the IAP
sensor output voltage at the wire side coupler between
G/B wire and B/Br wire.
IAP sensor output voltage
Approx. 2.63 V at idle speed
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Voltage ( )
Is the voltage OK?
Go to Step 3. • Check the vacuum
hose for crack or
damage.
• Open or short circuit
in the G/B wire.
• If vacuum hose and
wire is OK, replace
the IAP sensor with a
new one. Refer to
“IAP Sensor Removal
and Installation in
Section 1C
(Page 1C-2)”.
Step Action Yes No
“13”
“6”
(A)
(B)
“B”
“A”
I831G1110030-03
(B)
(A)
I831G1110031-02
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