DTC P0105 (P_S) - Pressure Sensor Circuit Malfunction: Description

Pressure sensor is used only in A/T vehicles. It is located at front of right suspension in engine compartment. It has a solenoid which switches between the atmospheric pressure and suction pressure lines and a pressure sensor. This allows either pressure line to be monitored.

A pressure output signal is sent to the ECM to diagnose the EGR system and evaporative emission control system. The pressure sensor is not used in M/T vehicles.

1. Turn ignition to OFF. After Connecting SSM or OBD-II scan tool, turn ignition to ON. Turn SSM or OBD-II scan tool to ON. Start Engine. Set function mode on SSM to F24 to display voltage signal value from pressure sensor or F49 to display pressure signal value from pressure sensor. If values are less than 0.2 volt or 0 kPa, go to step 2). If values are more than 4.9 volts or 140 kPa, go to step 4). If values are less than 4.9 volts or 140 kPa, repair for open, short or poor contact between ECM connector and pressure sensor connector.
2. Measure voltage between ECM connector B84, terminal No. 22 and ground. If voltage is less than 4.5 volts, shake harness and ECM connector with SSM in function mode F23 to display voltage sent from pressure sensor. If voltage goes to more than 4.5 volts, repair poor contact at ECM connector. If voltage does not increase, replace ECM. If voltage is 4.5 volts or more, measure voltage between ECM connector B84, terminal No. 23 and ground. If voltage is 0.2 volt or less, go to step 3). If voltage is more than 0.2 volt while shaking harness and connector of ECM (monitoring voltage with SSM) with SSM in function mode F23, repair poor contact in ECM connector. If voltage remains 0.2 volt or less, go to next step.
3. Turn ignition to OFF. Disconnect pressure sensor connector. Turn ignition to ON. Measure voltage between pressure sensor connector B2, terminal No. 3 and ground. If there is less than 4.5 volts, repair open circuit in harness between ECM and pressure sensor. If there is 4.5 volts or more, turn ignition to OFF. Disconnect ECM connector. Measure resistance between ECM connector B84, terminal No. 23 and pressure sensor connector B2, terminal No. 2, and between ECM connector B84, terminal No. 25 and pressure sensor connector B2, terminal No. 1. If resistance is not 10 ohms or less, repair open circuit in harness between ECM and pressure sensor connector. If resistance is 10 ohms or less, measure resistance between pressure sensor connector B2 and ground. If resistance is not 500 k/ohm or more, repair short circuit in harness between ECM and pressure sensor connector. If resistance is 500 k/ohm or more, check for poor contact in pressure sensor connector. If there is a poor contact, repair pressure sensor connector as necessary. If contact is good, replace pressure sensor.
4. Turn ignition to OFF. Disconnect pressure sensor connector. Turn ignition to ON. Set SSM to function mode F24. If voltage is more than 4.9 volts, repair short circuit in harness between ECM and pressure sensor connector. If voltage is less than 4.9 volts, replace pressure sensor.