FI SYSTEM DIAGNOSIS 4-47
Step 1
IAT sensor input voltage check
1) Turn the ignition switch OFF.
2) Disconnect the IAT sensor coupler
1
.
3) Check for proper terminal connection to the IAT sensor cou-
pler.
4) If connections are OK, turn the ignition switch ON.
5) Measure the input voltage between the Y/R wire and ground.
6) If OK, measure the input voltage between the Y/R wire and
B/Br wire.
09900-25008: Multi circuit tester set
Tester knob indication: Voltage (
)
IAT sensor input voltage:
4.5 – 5.5 V
(
+
terminal: Y/R –
-
terminal: Ground)
(
+
terminal: Y/R –
-
terminal: B/Br)
Is check result OK?
1
YES
Go to Step 3.
NO
Go to Step 2.
V
1
