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DTC P0105 - Barometric Pressure Circuit Malfunction

NOTE: For terminal identification, see TERMINAL IDENTIFICATION in SELF-DIAGNOSTICS section. For circuit and wire color identification, see WIRING DIAGRAMS article.
  1. Barometric pressure sensor is located in Volume Airflow (VAF) sensor. Install Test Harness MB991348 between VAF sensor harness connector and VAF. Check voltage between ground and VAF sensor connector terminal No. 2. Voltage should be 3.7-4.3 volts at 0 ft. (0 m) to 3.2-3.8 volts at 3937 ft. (1200 m). If voltage is as specified, go to next step. If voltage is not as specified, go to step 3).
  2. Turn ignition on. With PCM connector connected, check voltage between ground and PCM terminal No. 65. Voltage should be 3.7-4.3 volts at 0 ft. (0 m) to 3.2-3.8 volts at 3937 ft. (1200 m). If voltage is as specified, check PCM connector. If PCM connector is okay, replace PCM. If voltage is not as specified, check wiring harness between PCM and VAF sensor.
  3. Disconnect VAF sensor connector. Turn ignition on. Check voltage between ground and VAF sensor connector terminal No. 1. Voltage should be 4.8-5.2 volts. Turn ignition off. Check continuity between ground and VAF sensor connector terminal No. 1. If voltage is as specified and continuity exists, go to next step. If voltage is not as specified or continuity does not exist, go to step 5).
  4. Check VAF sensor connector and wiring harness between PCM and VAF sensor. If connector and wiring are okay, replace VAF sensor.
  5. Check PCM connector and wiring harness between PCM and VAF sensor connector. If connector and wiring are okay, replace PCM.
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