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4. CHECK IAT SENSOR GROUND CIRCUIT FOR AN OPEN OR SHORT • Turn ignition switch off. • Disconnect ECM harness connector. • Check harness continuity between following terminals. A/T SENSOR TERMINAL ECM TERMINAL CONTINUITY 5 76 Yes • Continuity should exist. • Check harness for short to power and short to ground. Is the check result normal? Yes >> Go to the next step. No >> Repair circuit for an open or short to power or short to ground in harness or connectors. 5. CHECK IAT SENSOR • Check resistance between MAF sensor terminal 5 and 6 under the following conditions: IAT°C RESISTANCE K ⍀ 20°C 2.3 - 3.0 80°C 0.30 - 0.42 • Connect IAT sensor connector. • Connect ECM connector. • Turn ignition switch on. • Check sensor signal output. TERMINAL NO. ITEM CONDITION DATA (DC VOLTAGE) 56 IAT sensor Ignition switch: ON IAT: 0°C 3.2 - 3.8 V IAT: 20°C 2.3 - 2.9 V IAT: 40°C 1.5 - 2.1 V IAT: 80°C 0.4 - 1.0 V 76 Sensor (GND) Ignition switch: ON 0 V Is the check result normal? Yes >> Go to the next step. No >> Replace IAT sensor. DIAGNOSIS & TESTING 03
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