12-31 FI SYSTEM DIAGNOSIS
“17” IAP SENSOR CIRCUIT MALFUNCTION
INSPECTION
Step 1
1) Stop the engine.
2) Remove the seat. ("5-2)
3) Check the IAP sensor coupler for loose or poor contacts.
If OK, then measure the IAP sensor input voltage.
4) Disconnect the IAP sensor coupler.
DETECTED CONDITION POSSIBLE CAUSE
IAP sensor voltage is not within the following range.
0.5 V Sensor voltage < 4.4 V
NOTE:
Note that atmospheric pressure varies depending on
weather conditions as well as altitude.
Take that into consideration when inspecting volt-
age.
• Clogged vacuum passage.
• Air being drawn from vacuum passage between
throttle body and IAP sensor.
• IAP sensor circuit open or shorted to ground.
• IAP sensor malfunction.
• ECM malfunction.
ECM
VCC
IAP
E2
IAP sensor
B/Br
R/Bl
G/B
CAUTION
When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with
a needle pointed tester probe to prevent the terminal damage or terminal bend.
To Next Page
Loading...
