DTC P0867: Transmission Fluid Pressure: Notes

WARNING: This page is about a different car, the 2020 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

1. -

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Acceleration is poor during standing start.
Shift control malfunction
Engine speed increases abruptly.
CVT chain slippage

Wiring diagram:

CVT control system Ref. to WIRING SYSTEM (IMPREZA MODEL)>CVT CONTROL SYSTEM .

G10276498

Courtesy of SUBARU OF AMERICA, INC.

G10276512

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CAUTION:

Before performing diagnosis, record the freeze frame data.
Use CHECK BOARD when measuring the TCM terminal voltage and resistance.
After servicing or replacing faulty parts, perform the last step of the basic diagnostic procedure. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>BASIC DIAGNOSTIC PROCEDURE .

G13615758

Courtesy of SUBARU OF AMERICA, INC.

G13615759

Courtesy of SUBARU OF AMERICA, INC.

G13615760

Courtesy of SUBARU OF AMERICA, INC.

CHECK DTC .
Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC TROUBLE CODE (DTC) .

Is only DTC P0867 displayed?

Yes : Go to 4.

No : Go to 2.
CHECK DTC .
Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC TROUBLE CODE (DTC) .

Is DTC P0841 displayed?

Yes : Go to 3.

No : Perform the diagnosis according to DTCs other than P0867 and P0841. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC TROUBLE CODE (DTC)LIST . After the diagnosis, start the engine, and drive for 20 minutes in any driving pattern. (Include driving at a constant legal speed (for 20 seconds) at least once.) After driving, repeat the step 1.
CHECK DTC .
Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC TROUBLE CODE (DTC) .

Is DTC P0746 or P0747 displayed?

Yes : Go to 4.

No : Perform the diagnosis according to DTC P0841. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P0841 TRANSMISSION FLUID PRESSURE SENSOR/SWITCH "A" CIRCUIT RANGE/PERFORMANCE .
CHECK SECONDARY SOLENOID (ACTIVE TEST) .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, perform the active test for secondary solenoid. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>ACTIVE TEST .
Does the indication of 0 → 500 mA appear repeatedly during the active test, and does operating sound emit during indicating 500 mA?

Yes : Go to 7.

No : Go to 5.
CHECK SECONDARY SOLENOID .
1. Turn the ignition switch to OFF.
2. Disconnect the TCM connector.
3. Measure the resistance between TCM connector and transmission body.
  Connector & terminal
  
  (T10) No. 32 - Transmission body:
Is the resistance approximately 4.8 - 8.4 Ω? (When cold)

Yes : Go to 7.

No : Go to 6.
CHECK HARNESS .
Check the transmission harness. (Open circuit, short circuit to power supply, short circuit to ground, and poor contact)

Is the check result OK?

Yes : Go to 7.

No : Repair the harness.
CHECK INPUT SIGNAL FOR TCM .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, read data of [secondary pressure sensor voltage.] in the [Data Monitor] of [Transmission]. (While shaking the secondary pressure sensor harness) Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DATA MONITOR .
Is [secondary pressure sensor voltage.] 0.39 - 0.61 [V]?

Yes : Go to 15.

No : Go to 8.
CHECK HARNESS .
CAUTION: Start work after ATF cools down.
1. Turn the ignition switch to OFF.
2. Disconnect the TCM connector.
3. Disconnect the secondary pressure sensor connector.
4. Measure the resistance between TCM connector and secondary pressure sensor connector.
  Connector & terminal
  
  (T10) No. 33 - (AT6) No. 1:
  
  (T10) No. 5 - (AT6) No. 2:
  
  (T10) No. 2 - (AT6) No. 3:
Is the resistance less than 1 Ω?

Yes : Go to 9.

No : Repair the open circuit of harness.
CHECK HARNESS .
Measure the resistance between TCM connectors.

Connector & terminal

(T10) No. 33 - (T10) No. 2:

(T10) No. 5 - (T10) No. 33:

(T10) No. 2 - (T10) No. 5:

Is the resistance 1 MΩ or more?

Yes : Go to 10.

No : Repair the short circuit of harness.
CHECK HARNESS .
Measure the resistance between TCM connector and transmission body.

Connector & terminal

(T10) No. 33 - Transmission body:

(T10) No. 5 - Transmission body:

(T10) No. 2 - Transmission body:

Is the resistance 1 MΩ or more?

Yes : Go to 11.

No : Repair the short circuit of harness.
CHECK POWER SUPPLY FOR SECONDARY PRESSURE SENSOR .
1. Connect the TCM connector.
2. Turn the ignition switch to ON.
3. Measure the voltage between TCM connectors.
  Connector & terminal
  
  (T10) No. 33 (+) - (T10) No. 2 (-):
Is the voltage 4.6 - 5.4 V?

Yes : Go to 12.

No : Check for poor contact of connector, and if no fault is found, replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>TRANSMISSION CONTROL MODULE (TCM) .
CHECK POWER SUPPLY FOR SECONDARY PRESSURE SENSOR .
1. Turn the ignition switch to OFF.
2. Connect the secondary pressure sensor connector.
3. Turn the ignition switch to ON.
4. Measure the voltage between TCM connectors.
  Connector & terminal
  
  (T10) No. 33 (+) - (T10) No. 2 (-):
Is the voltage 4.6 - 5.4 V?

Yes : Go to 13.

No : Replace the secondary pressure sensor. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>SECONDARY PRESSURE SENSOR .
CHECK SECONDARY PRESSURE SENSOR OUTPUT .
Measure the voltage between TCM connectors.

Connector & terminal

(T10) No. 5 (+) - (T10) No. 2 (-):

Is the voltage 0.39 - 0.61 V?

Yes : Go to 14.

No : Check for poor contact of connector, and if no fault is found, replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>TRANSMISSION CONTROL MODULE (TCM) .
CHECK CONNECTOR .
1. Turn the ignition switch to OFF.
2. Disconnect the TCM connector.
3. Disconnect the secondary pressure sensor connector.
4. Check the TCM connector (T10) and the secondary pressure sensor connector (AT6).
Is the check result OK?

Yes : Go to 15.

No : Repair the connector, or replace harness.
CHECK TRANSMISSION FLUID .
Check the condition of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CVTF>CONDITION CHECK .

Is the check result OK?

Yes : Return ATF. Go to 16.

No : Replace the ATF. Go to 16.
CHECK TRANSMISSION FLUID .
1. Connect all connectors.
2. Check the amount of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CVTF>ADJUSTMENT .
Is the check result OK?

Yes : Go to 17.

Adjust the amount of ATF. Go to 17.
CHECK INPUT SIGNAL FOR TCM .
1. Lift up the vehicle.
2. Start the engine.
3. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F).
4. Depress the brake pedal and move the select lever to each range at an interval of five seconds.
  NOTE: Move the select lever in the following order: "P" → "R" → "N" → "D" → "N" → "R" →
5. Stabilize the engine speed at idle.
6. Using the Subaru Select Monitor, read data of [Actual Secondary Pressure] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DATA MONITOR .
Is [Actual Secondary Pressure] 0.5 - 1.5 [MPa]?

Yes : Go to 18.

No : Replace the control valve body. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CONTROL VALVE BODY .
CHECK INPUT SIGNAL FOR TCM .
1. Shift the select lever to "P" range.
2. Keep the engine speed at 3, 000 rpm.
3. Using the Subaru Select Monitor, read data of [Actual Secondary Pressure] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DATA MONITOR .
Is [Actual Secondary Pressure] 1.5 - 2.5 [MPa]? Is the difference between the actual oil pressure and the value measured in Step 17 0.2 [MPa] or more?

Yes : Go to 19.

No : Replace the control valve body. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CONTROL VALVE BODY .

CHECK FREEZE FRAME DATA .

Turn the ignition switch to OFF.
Check the recorded freeze frame data for DTC P0867. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>FREEZE FRAME DATA .

Apply the values of [Actual Secondary Pressure] and [Secondary Actual Current] recorded in the freeze frame data onto the graph shown in the following figure, and judge if either low-voltage malfunction or high-voltage malfunction occurs.

G13615761

Courtesy of SUBARU OF AMERICA, INC.

NOTE: Symptom that the DTC P0867 illuminates can be classified into 2 patterns.

Low-voltage malfunction: detected due to insufficient oil pressure
High-voltage malfunction: detected due to excessive oil pressure

Was the detected symptom low-voltage malfunction?

Yes : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>AUTOMATIC TRANSMISSION ASSEMBLY .

No : Go to 20.

CHECK TCM INPUT SIGNAL (STALL TEST) .
1. Apply the parking brake.
2. Set the select lever to "D" range.
3. Depress the brake pedal firmly.
4. Slowly open the accelerator fully, and stabilize the engine speed.
5. Using the Subaru Select Monitor, read data of [Actual Secondary Pressure] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DATA MONITOR .
  CAUTION: Do not perform a stall test for over 5 seconds at a time.
Is the [Actual Secondary Pressure] 6.0 [MPa] or more?

Yes : Replace the control valve body. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CONTROL VALVE BODY .

No : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>AUTOMATIC TRANSMISSION ASSEMBLY .