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Home >> Subaru >> 2001 >> Outback Base, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - 2.2L & 2.5L >> Diagnostic Tests >> DTC P0107: Intake Air Temperature & Pressure Sensor Circuit Low Input - Forester, IMPREZA 2.5L & Legacy & Outback 2.5L A/T

DTC P0107: Intake Air Temperature & Pressure Sensor Circuit Low Input - Forester, IMPREZA 2.5L & Legacy & Outback 2.5L A/T

  1. Perform basic diagnostic procedure. See BASIC DIAGNOSTIC PROCEDURE . Start engine. Using scan tool, observe intake manifold absolute pressure reading. If pressure is less than 3.94 in. Hg, go to step  3. If pressure is not less than 3.94 in. Hg, go to next step.
  2. Check for poor terminal contact at ECM and intake air temperature and pressure sensor connectors. Repair as required. If terminal contact is okay, system has returned to normal.
  3. Using a DVOM connected to ground, backprobe ECM connector B136 (30-pin connector) terminal No. 15. See Figure. If voltage is more than 4.5 volts, go to step  5. If voltage is not more than 4.5 volts, go to next step.
  4. Measure voltage between ground and ECM connector B136 (30-pin connector) terminal No. 15 while wiggling harness and ECM connector. If voltage changes more than 4.5 volts, repair poor terminal contact in ECM connector. If voltage does not change more than 4.5 volts, contact authorized Subaru dealership because probable cause is deterioration of multiple parts.
  5. Measure voltage between ground and ECM connector B136 (30-pin connector) terminal No. 5. If voltage is less than 0.2 volt, go to step  7. If voltage is not less than 0.2 volt, go to next step.
  6. Using scan tool, observe absolute pressure signal while wiggling ECM connector. If pressure changes more than 3.94 in. Hg, repair poor terminal contact at ECM connector. If pressure does not change more than 3.94 in. Hg, go to next step.
  7. Turn ignition off. Disconnect intake air temperature and pressure sensor connector. Turn ignition on. Using a DVOM connected to ground, measure voltage at intake air temperature and pressure sensor connector terminal No. 3. See Fig 1. If voltage is more than 4.5 volts, go to next step. If voltage is not more than 4.5 volts, locate and repair open circuit in wiring between ECM and intake air temperature and pressure sensor. See WIRING DIAGRAMS article.
  8. Turn ignition off. Disconnect ECM connector B136 (30-pin connector). Measure resistance between ECM connector B136 (30-pin connector) terminal No. 16 and intake air temperature and pressure sensor connector terminal No. 1. If resistance is less than one ohm, go to next step. If resistance is not less than one ohm, locate and repair open circuit in wiring between ECM and intake air temperature and pressure sensor.
  9. Measure resistance between ground and intake air temperature and pressure sensor connector terminal No. 4. If resistance is more than 500 k/ohms, go to next step. If resistance is not more than 500 k/ohms, locate and repair short to ground in wiring between ECM and intake air temperature and pressure sensor.
  10. Check intake air temperature and pressure sensor connector for poor terminal contact. Repair as necessary. If connector is okay, replace intake air temperature and pressure sensor. Clear memory and perform verification procedure. See CLEARING DIAGNOSTIC TROUBLE CODES  and VERIFICATION PROCEDURE  .
Fig 1: 4-Pin Connector Terminal Identification
G00013006Courtesy of SUBARU OF AMERICA, INC.
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