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general information - Martin Nez

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4-54 FI SYSTEM DIAGNOSISStep 21) Turn the ignition switch to OFF.2) Measure the IAT sensor resistance.2 IAT sensor resistance: Approx. 2.45 kΩ at 20 °C(Terminal – Terminal) 09900-25008: Multi-circuit tester set Tester knob indication: Resistance (Ω)Is the resistance OK?2YESNO• Dg or B/Br wire open or shorted to ground, orpoor Q or S connection• If wire and connection are OK, intermittent troubleor faulty ECM.• Recheck each terminal and wire harness foropen circuit and poor connection.• Replace the ECM with a known good one, andinspect it again.Replace the IAT sensor with a new one.ECM couplers (Harness side) IAT sensor specificationIntake Air TempResistance20 °C Approx. 2.45 kΩ50 °C Approx. 0.808 kΩ80 °C Approx. 0.322 kΩ110 °C Approx. 0.148 kΩNOTE:IAT sensor resistance measurement method is the same way asthat of the ECT sensor. Refer to page 7-7 for details.

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