TM 10-3930-675-20-10021 00-1ENGINE AMBIENT AIR PRESSURE SENSOR AND CIRCUITS TROUBLESHOOTING0021 00THIS WORK PACKAGE COVERSError Code 1221 - High Voltage Detected at AmbientAir Pressure Sensor CircuitError Code 1222 - Low Voltage Detected at AmbientAir Pressure Sensor CircuitError Code 1295 - Ambient Air Pressure Sensor CircuitFailureINITIAL SETUPReferencesTM 10-3930-675-10Tools and Special ToolsCable, breakout (Item 43, WP 0204 00)Test lead, female (Item 48, WP 0204 00)Test lead, male (Item 51, WP 0204 00)NOTE•Refer to WP 0004 00 for additional troubleshooting guidance, information, and illustrationsthat locate critical components.•Refer also to illustration at end of work package for component location.•Ambient air pressure sensor is mounted to bracket on left side of engine, to right-rear of engineECU.Table 1. Error Code 1221 - High Voltage Detected at Ambient Air Pressure Sensor CircuitTroubleshooting Procedures.MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONError Code 1221 - High Voltage Detected atAmbient Air Pressure Sensor Circuit1. Ensure that ignition switch isin OFF position anddisconnect engine harnessfrom ambient air pressuresensor.2. Inspect ambient air pressuresensor and sensor harnessconnectors for dirty,corroded, bent, broken,pushed back, and extendedpins.Clean and repair connector(s) asrequired (WP 0111 00).3. Check ambient air pressuresensor and sensor harness fordirt or moisture in or onconnector and for missing ordamaged connector seals.Remove dirt and moisture fromconnector. Replace missing ordamaged connector seals (WP0111 00).
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