Page 290 - 2006 HARLEY FLSTCI SERVICE MANUAL

5.20 5-71

DIAGNOSTICS Diagnostic Tips Check the following conditions: Poor connection: Inspect ECM and harness connector ● [78] for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor ter- minal-to-wire connection and damaged harness. Perform 5.8 WIGGLE TEST to locate intermittents: If ● connections and harness check out OK, use a DVOM to check the intake air temperature sensor voltage reading while moving related connectors and wiring harness. If the failure is induced, the intake air temperature sensor voltage reading will change. Shifted sensor: Refer to Table 5

TEMP °F VOLTAGE -4 4.9 14 4.8 32 4.6 50 4.3 68 4.0 77 3.8 86 3.6 104 3.1 122 2.6 140 2.2 158 1.7 176 1.4 194 1.1 212 0.9

DESCRIPTION

DTC P0112, P0113 The ECM supplies and monitors a voltage signal (terminal 7) to one side of the intake air temperature sensor (IAT sensor). The other side of the IAT sensor is connected to a common sensor ground, which is also connected to the ECM (terminal The IAT sensor is a thermistor device, meaning that at a spe- cific temperature, it will have a specific resistance across its terminals. As this resistance varies, so does the voltage on At high temperatures, the resistance of the sensor is very low, which effectively lowers the signal voltage on termi- At low temperatures, the resistance is very high, allow

HOME GENERAL IAT Sensor 26). (terminal 7). ● nal 7. ● operating conditions. DTC P0112 P0113 TEMP °C -20 -10 0 10 20 25 30 40 50 60 70 80 90 100