17" Iap Sensor Circuit Malfunction - Suzuki RM-z450 Owner's Service Manual

12-31 FI SYSTEM DIAGNOSIS

"17" IAP SENSOR CIRCUIT MALFUNCTION

DETECTED CONDITION
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.
IAP sensor
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.
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.
POSSIBLE CAUSE
• 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.
R/Bl
G/B
B/Br
CAUTION
1
ECM
VCC
IAP
E2