P0105

DTC P0105
PRESSURE SENSOR CIRCUIT MALFUNCTION (P - S)





1. Sensor Unit
2. O-ring.
3. Case.
4. Pipe.
5. Through Capacitor.
6. Terminal.
7. Inner Lead.
8. Resin.
9. Metal Lid.

Description
- The Pressure Sensor is used in A/T vehicles. It is located in the Engine compartment at the front of the right-hand suspension. It consists of a solenoid which switches between the atmospheric pressure and suction pressure lines and a Pressure Sensor. This arrangement allows either pressure line to be monitored.
- A sensor output signal is sent to the Engine Control Module (ECM) to diagnose the Exhaust Gas Recirculation (EGR) system and Evaporative Emission Control System.
- The Pressure Sensor is not used in M/T vehicles.

DTC Detecting Condition
Immediately at fault recognition.











1. Check Transmission type.





2. Connect Subaru Select Monitor or the OBD-II General Scan Tool, and read data.
a. Turn Ignition switch to "OFF".
b. Connect Subaru Select Monitor or the OBD-II General Scan Tool to Data Link Connector.
c. Turn Ignition switch to "ON" and Subaru Select Monitor or the OBD-II General Scan Tool switch to "ON".
d. Start Engine.
e. Read the data on Subaru Select Monitor or the OBD-II General Scan Tool.

Subaru Select Monitor
- Designate mode using function key.
- Function mode: F24 or F49

[CHECK]: Less than 0.2 Volts or 0 kPa.
[YES]: Go to step 3.
[NO]: Go to next [CHECK].

[CHECK]: More than 4.9 Volts or 140 kPa.
[YES]: Go to step 5.
[NO]: Repair the harness and connector between pressure sensor and ECM.

HINT: Open or short circuit of harness between Pressure Sensor and ECM.
Poor contact of Pressure Sensor connector and ECM connector.

OBD-II General Scan Tool
- For detailed operation procedures refer to the OBD-II General Scan Tool Instruction Manual.

3. Check input signal for ECM. (Using voltage meter and Subaru Select Monitor.)





a. Measure voltage between ECM and body.
[CHECK]: Connector & terminal:
(B84) No. 22 - Body/4.5 Volts, or more.
[YES]: Go to next step.
[NO]: Go to next [CHECK].

[CHECK]: Is the voltage more than 4.5 Volts while shaking harness and connector of ECM?

Subaru Select Monitor
- Designate mode using function key.
- Function mode: F23.

[YES]: Repair poor contact in ECM connector.
[NO]: Replace ECM with a new one.





b. Measure voltage between ECM and body.
[CHECK]: Connector & terminal:
(B 84) No. 23 - Body/O.2 Volts, or less.
[NO]: Go to next [CHECK].
[YES]: Go to step 4.

[CHECK]: Is the voltage more than 0.2 Volts while shaking harness and connector of ECM and monitoring the value with Subaru Select Monitor?

Subaru Select Monitor
- Designate mode using function key.
- Function mode: F23.

[YES]: Repair poor contact in ECM connector.
[NO]: Go to step 4.

4. Check harness connector between ECM and Pressure Sensor.





a. Turn Ignition switch to "OFF".
b. Disconnect connector Pressure Sensor.
c. Turn Ignition switch to "ON".
d. Measure voltage of harness connector between Pressure Sensor and body.
[CHECK]: Connector & terminal:
(B2) No. 3 - Body/4.5 Volts, or more.
[NO]: Repair open circuit of harness between ECM and Pressure Sensor.
[YES]: Go to the next step.






e. Turn Ignition switch to "OFF".
f. Disconnect connector from ECM.
g. Measure resistance of harness connector between ECM and Pressure Sensor.
[CHECK]: Connector & terminal:
(B84) No. 23 - (B2) No. 2/10 Ohms or less.
(B84) No. 25 - (B2) No. 1/10 Ohms or less.
[NO]: Repair open circuit of harness between ECM and Pressure Sensor connector.
[YES]: Go to the next step.






h. Measure resistance of the connector between Pressure Sensor and body.
[CHECK]: Connector & terminal:
(B2) No. 2 - Body/500 K-Ohms or more.
[NO]: Repair short circuit of the harness between ECM and Pressure Sensor connector.
[YES]: Go to the next [CHECK].

[CHECK]: Is there poor contact in Pressure Sensor connector?
[YES]: Repair poor contact in Pressure Sensor connector.
[NO]: Replace Pressure Sensor with a new one.


5. Check harness connector between ECM and Pressure Sensor.
a. Turn Ignition switch to "OFF".
b. Disconnect connector from Pressure Sensor.
c. Turn Ignition switch to "ON".
d. Read data on Subaru Select Monitor or the OBD-II General Scan Tool.

Subaru Select Monitor
- Designate mode using function key.
- Function mode: F24.

[CHECK]: Is the value more than 4.9 Volts?
[YES]: Repair short circuit of harness between ECM and Pressure Sensor connector.
[NO]: Replace Pressure Sensor with a new one.

OBD-II General Scan Tool
- For detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.