FI SYSTEM DIAGNOSIS 4-35
Step 1
IAP sensor power supply circuit check
1) Turn the ignition switch OFF.
2) Remove the fuel tank. (
5-2)
3) Disconnect the IAP sensor coupler related DTC. (#1 cylinder
1
or #2 cylinder
2
)
4) Check for proper terminal connection to the IAP sensor cou-
pler.
5) If connections are OK, turn the ignition switch ON.
6) Measure the voltage between the R wire and B/Br wire.
09900-25008: Multi circuit tester set
Tester knob indication: Voltage (
)
IAP sensor power supply voltage:
4.5 – 5.5 V (
+
terminal: R –
-
terminal: B/Br)
Is check result OK?
Step 2
IAP sensor ground circuit check
1) Measure the voltage between the R wire and ground.
09900-25008: Multi circuit tester set
Tester knob indication: Voltage (
)
IAP sensor power supply voltage:
4.5 – 5.5 V (
+
terminal: R –
-
terminal: Ground)
Is check result OK?
Step 3
IAP sensor signal circuit check
1) Turn the ignition switch OFF.
2) Disconnect the ECM couplers
1
.
1
YES
Go to Step 3.
NO
Go to Step 2.
V
1
YES
Repair or replace the B/Br wire.
NO
Repair or replace the R wire.
V
2
3
