FI SYSTEM DIAGNOSIS 4-37 “C13” (P0105-H/L) IAP SENSOR CIRCUIT MALFUNCTION DETECTED CONDITION POSSIBLE CAUSE C13 IAP sensor voltage is not within the fol- • Clogged vacuum passage between throttle body lowing range. and IAP sensor. 0.5 V Sensor voltage < 4.85 V • Air being drawn from vacuum passage between NOTE: throttle body and IAP sensor. Note that atmospheric pressure varies • IAP sensor circuit open or shorted to ground. depending on weather conditions as • IAP sensor malfunction. well as altitude. • ECM malfunction. Take that into consideration when inspecting voltage. P0105 H Sensor voltage is higher than specified • IAP sensor circuit shorted to VCC or ground cir- value. cuit open. L Sensor voltage is lower than specified • IAP sensor circuit open or shorted to ground or value. VCC circuit open. ECM IAP sensor E R L VCC G/B P IAP B/Br E2 SAM INSPECTION 1 Step 1 (When indicating C13:) 1) Turn the ignition switch OFF. 2) Lift and support the fuel tank. (5-3) 3) Check the IAP sensor coupler for loose or poor contacts. If OK, then measure the IAP sensor input voltage.