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DTC P0105 (P_S): Pressure Sensor Circuit Malfunction

  1. Turn ignition off. Connect SSM. Start engine. Set SSM to function mode F21 to display pressure signal value from pressure sensor. If value is less than zero kPa, go to next step. If value is more than zero kPa and less than 140 kPa, repair wiring or connector. If value is more than 140 kPa, go to step 9).
  2. Turn ignition on, with engine off. Using DVOM connected to chassis ground, backprobe ECM connector terminal No. 21. See appropriate wiring diagram in WIRING DIAGRAMS article. If voltage reading is 4.5 volts or more, go to next step. If voltage reading is less than 4.5 volts, wiggle ECM connector. If voltage reading changes to more than 4.5 volts, check for poor or faulty ECM connector terminals or circuit. If terminals and circuit are okay, replace ECM.
  3. Backprobe ECM connector terminal No. 26. If voltage reading is less than .2 volt, go to step 5). If voltage reading is .2 volt or more, go to next step.
  4. Set SSM to function mode F20, to check pressure signal value sent from pressure sensor. If value changes to more than zero kPa when wiggling wiring and connector to ECM, check and repair poor terminal contact to ECM. If value does not change when wiggling connector to ECM, go to next step.
  5. Turn ignition off. Disconnect pressure sensor connector. Turn ignition on. Check voltage between pressure sensor connector terminal No. 3 and chassis ground. If voltage reading is 4.5 volts or more, go to next step. If voltage reading is less than 4.5 volts, check for open in circuit between ECM and pressure sensor connector.
  6. Turn ignition off. Disconnect ECM connector. Check resistance between ECM connector terminal No. 26 and pressure sensor connector terminal No. 2. If resistance is one ohm or less, go to next step. If resistance is more than one ohm, repair poor terminal contact or open in circuit between ECM and pressure sensor connector.
  7. Check resistance between ECM connector terminal No. 20 and pressure sensor connector terminal No. 1. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair poor terminal contact or open in circuit between ECM and pressure sensor connector.
  8. Check resistance between pressure sensor connector terminal No. 2 and chassis ground. If resistance is 500,000 ohms or more, check for poor terminal contact in connector. If terminal contact is okay, replace pressure sensor. If resistance is less than 500,000 ohms, check for short in circuit between ECM and pressure sensor connector.
  9. Turn ignition off. Disconnect pressure sensor connector. Turn ignition on. Set SSM to function mode F21. If scan tool reads more than 140 kPa, check for short in circuit between ECM and pressure sensor connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If scan tool reads a value of 140 kPa or less, replace pressure sensor.
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