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1A-31 Engine General Information and Diagnosis:
Step
2
1) Connect the IAP sensor coupler and ECM coupler.
2) Connect the fuel feed hose and fuel pump read wire
coupler, and lift and support the fuel tank. Refer to "Fuel
Tank Removal and Installation in Section 1G (Page 1G-
9)".
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.
(#2: Between P/B and B/Br wires)
(#1: Between G/B and B/Br wires)
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Voltage (
)
IAP sensor output voltage
Approx. 2.6 V at idle speed
(#2: (+) terminal: P/B – (–) terminal: B/Br)
(#1: (+) terminal: G/B – (–) terminal: B/Br)
Is the voltage OK?
Action
IAP sensor #2
(A)
(B)
IAP sensor #1
(A)
(B)
Yes
Go to Step 3.
I940H1110022-01
I940H1110019-01
No
• Check the vacuum
hose for crack or
damage.
• Open or short circuit
in the P/B wire (#2).
• Open or short circuit
in the G/B wire (#1).
• If the vacuum hose
and wire are OK,
replace the IAP
sensor with a new
one.
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