general information - Martin Nez

FI SYSTEM DIAGNOSIS 4-55“C22” (P1450-H/L) AP SENSOR CIRCUIT MALFUNCTIONC22DETECTED CONDITIONPOSSIBLE CAUSEAP sensor voltage is not within the following• Clogged air passage with dustrange.• AP sensor circuit open or shorted to ground0.5 V Sensor voltage < 4.85 V • AP sensor malfunctionNOTE:• ECM malfunctionNote that atmospheric pressure variesdepending on weather conditions aswell as altitude.Take that into consideration wheninspecting voltage.P1450 Sensor voltage is higher than specifiedHvalue.Sensor voltage is lower than specifiedLvalue.• AP sensor circuit shorted to VCC or ground circuitopen• AP sensor circuit open or shorted to ground orVCC circuit openAP sensorECMG/YAPB/BrE2RVCCINSPECTIONStep 1 (When indicating C22:)1) Turn the ignition switch to OFF.2) Lift and support the fuel tank. (5-3)3) Check the AP sensor coupler for loose or poor contacts.If OK, then measure the AP sensor input voltage.1