FI SYSTEM DIAGNOSIS 4-49
• Voltage
09900-25008: Multi circuit tester set
Tester knob indication: Voltage (
)
– Between Y/R wire or B/Br wire and ground: approx. 0 V
(When ignition switch is ON)
Is check result OK?
Step 3
IAT sensor check
1) Turn the ignition switch OFF.
2) Measure the IAT sensor resistance.
NOTE:
IAT sensor resistance measurement method is the same way as
that of the ECT sensor. Refer to page 7-10 for details.
09900-25008: Multi circuit tester set
Tester knob indication: Resistance (
)
IAT sensor resistance:
Approx. 2.45 k
at 20 °C (68 °F)
(Terminal – Terminal)
Is check result OK?
YES
Replace the ECM with a known good one, and
inspect it again.
NO
Repair or replace the defective wire harness.
V
2
YES
Replace the ECM with a known good one, and
inspect it again.
NO
Replace the IAT sensor with a new one.
3
