C13" Iap Sensor Circuit Malfunction - Suzuki AN400 Service Manual

"C13" IAP SENSOR CIRCUIT MALFUNCTION

DETECTED CONDITION
IAP sensor voltage low or high.
(0.30 V Sensor voltage < 4.45 V)
(without the above range.)
NOTE:
Note that atmospheric pressure varies depending on
weather conditions as well as altitude.
Take that into consideration when inspecting volt-
age.
INSPECTION
Step 1
1) Remove the front trunk box cover. (#7-18)
2) Turn the ignition switch OFF.
3) Check the IAP sensor coupler 1 for loose or poor contacts.
If OK, then measure the IAP sensor input voltage.
4) Disconnect the IAP sensor coupler 1.
5) Turn the ignition switch ON.
6) Measure the voltage at the Red wire and ground.
If OK, then measure the voltage at the Red wire and B/Br
wire.
$ IAP sensor input voltage: 4.5 – 5.5 V
! 09900-25008: Multi circuit tester set
& Tester knob indication: Voltage (')
Is the voltage OK?
YES Go to Step 2
• Loose or poor contacts on the ECM coupler.
NO • Open or short circuit in the Red wire or B/Br
wire.
• Clogged vacuum passage between throttle body
• Air being drawn from vacuum passage between
• IAP sensor circuit open or shorted to ground.
• IAP sensor malfunction.
• ECM malfunction.
( + Red – - Ground)
( + Red – - B/Br)
POSSIBLE CAUSE
and IAP sensor.
throttle body and IAP sensor.
1
1
FI SYSTEM 4-25
R
B/Br
R