Engine General Information and Diagnosis: 1A-68
3 1) Turn the ignition switch OFF.
2) Disconnect the IAT sensor coupler.
3) Measure the IAT sensor resistance.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Resistance (Ω)
IAT sensor resistance
Approx. 2.56 kΩ at 20 °C (68 °F)
(Terminal – Terminal)
Is the resistance OK?
• Dg or B/Br wire open
or shorted to the
ground, or poor 27 or
29 connection.
• If wire and
connection are OK,
intermittent trouble or
faulty ECM.
• Recheck each
terminal and wire
harness for open
circuit and poor
connection.
• Replace the ECM
with a known good
one, and inspect it
again. Refer to “ECM
Removal and
Installation in Section
1C (Page 1C-1)”.
Replace the IAT sensor
with a new one. Refer to
“IAP / TP / IAT Sensor
Removal and
Installation in Section
1C (Page 1C-2)”.
Step Action Yes No
(A)
I718H1110186-02
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