Excessive Shock Or Vibration Occurs At Re-Acceleration From A Constant Speed

WARNING: This page is about a different variant/trim than selected.

Wiring diagram:

CVT control system Ref. to WIRING SYSTEM>CVT CONTROL SYSTEM>WIRING DIAGRAM

Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

CAUTION:

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)>BASIC DIAGNOSTIC PROCEDURE

CHECK DTC .
Using the Subaru Select Monitor, read DTC of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)

Are any DTCs displayed?

Yes : Perform the diagnosis according to the DTC. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST

And then, Go to 2.

No : Go to 2.
CHECK TRANSMISSION FLUID .
NOTE:
When ATF inspection is performed in the diagnosis for the displayed DTC, go to step 4 .

Check the amount of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CVTF>INSPECTION

Is the check result OK?

Yes : Go to 3.

No : Adjust the amount of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CVTF>INSPECTION
CHECK TRANSMISSION FLUID .
Check the condition of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CVTF>REPLACEMENT

Is the check result OK?

Yes : Go to 4.

No : Check according to the "Corrective action" of ATF (CVTF) "CONDITION CHECK". Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CVTF>REPLACEMENT
CHECK TCM INPUT SIGNAL (STALL TEST) .
1. Lift up the vehicle.
2. Start the engine.
3. Apply the parking brake.
4. Set the select lever to "D" range.
5. Depress the brake pedal firmly.
6. Slowly open the accelerator fully, and stabilize the engine speed.
7. Using the Subaru Select Monitor, read data of [Actual line press.] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR
Is the value of [Actual line press.] 5.0 MPa or more?

Yes : Go to 5.

No : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION ASSEMBLY
CHECK CONDITION AT STALL TEST .
Check the condition at stall test.

Does the shock or noise occur at stall test?

Yes : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION ASSEMBLY

No : Go to 6.
CHECK VEHICLE SPEED AT PROBLEM OCCURRENCE .
Check the vehicle speed at problem occurrence.

Is the vehicle speed 15 km/h or more at problem occurrence?

Yes : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION ASSEMBLY

No : Go to 7.

CHECK DATA DURING DRIVING (GEAR RATIO) .

Start the engine.
Reproduce the symptom occurrence conditions (vehicle speed, oil temperature).

Using the Subaru Select Monitor, read the following data in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR

Actual Gear Ratio
Primary Pulley Speed
Front Wheel Speed

NOTE:

Data at chain slippage

Courtesy of SUBARU OF AMERICA, INC.

Is the value change of [Actual Gear Ratio] 0.1 or more and 2 Hz or more?

Yes : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION ASSEMBLY

No : Go to 8.

CHECK DATA DURING DRIVING (SECONDARY SPEED) .

Start the engine.
Reproduce the symptom occurrence conditions (vehicle speed, oil temperature).

Using the Subaru Select Monitor, read the following data in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR

Engine Speed
Actual Gear Ratio
Primary Pulley Speed
Secondary Pulley Speed

NOTE:

Data at chain slippage

Courtesy of SUBARU OF AMERICA, INC.

Is the value change of [Secondary Rev Speed] 100 rpm or more and 10 Hz or more?

Yes : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION ASSEMBLY

No : Go to 9.

CHECK DATA DURING DRIVING (CLUTCH SLIP) .

Start the engine.
Reproduce the symptom occurrence conditions (vehicle speed, oil temperature).

Using the Subaru Select Monitor, read the following data in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR

Secondary Pulley Speed
Front Wheel Speed
Actual Gear Ratio

NOTE:

Data at chain slippage

Courtesy of SUBARU OF AMERICA, INC.

NOTE:

Due to the gear ratio (1.229), change the scale of the Subaru Select Monitor as follows before performing the check.

[Secondary Rev Speed]:0-5000 rpm
[Front Wheel Speed]:0-4068 rpm

Is the difference between [Secondary Rev Speed] and [Front Wheel Speed] (x1.229) 50 rpm or more?

Yes : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION ASSEMBLY

No : Go to 10.

CHECK DATA DURING DRIVING (PRIMARY UP DUTY) .

Start the engine.
Reproduce the symptom occurrence conditions (vehicle speed, oil temperature).

Using the Subaru Select Monitor, read the following data in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR

Actual Gear Ratio
Primary UP Duty

NOTE:

Data at chain slippage

Courtesy of SUBARU OF AMERICA, INC.

If the primary UP DUTY is a rectangle waveform (A in the reference shown above) and the TCM part number is 30919AH13A~D or 30919AH14A~D, go to A.

If the primary UP DUTY is a rectangle waveform (A in the reference shown above) and the TCM part number is other than 30919AH13A~D or 30919AH14A~D, go to B.

For cases other than above, go to C.

Replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM)
Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION ASSEMBLY
Go to 11.

CHECK INPUT SIGNAL FOR TCM .
1. Start the engine.
2. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F).
3. Depress the brake pedal and move the select lever to each range at an interval of 5 seconds.
  NOTE:
  Move the select lever in the following order: "P" → "R" → "N" → "D" → "N" → "R" → "P".
4. Set the select lever to "D" range.
5. Drive at 2 km/h or more.
6. Stop the vehicle.
7. Shift the select lever to "P" range.
8. Stabilize the engine speed at idle.
9. Using the Subaru Select Monitor, read data of [Actual line press.], [Actual Secondary Pressure] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR
Are [Actual line press.] and [Actual Secondary Pressure] 0.5 - 1.5 MPa?

Yes : Go to 12.

No : When the value of [Actual line press.] is out of range Go to 13.

When the value of [Actual Secondary Pressure] is out of range Go to 25.
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 line press.], [Actual Secondary Pressure] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR
Is [Actual line press.] 1.5 - 2.5 MPa?

Yes : Currently, it is normal. Clear the memory to finish the diagnosis.

No : When the value of [Actual line press.] is out of range Go to 13.

When the value of [Actual Secondary Pressure] is out of range Go to 25.
CHECK LINE PRESSURE SOLENOID (ACTIVE TEST) .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, perform the active test for line pressure solenoid. Ref. to TRANSMISSION (DIAGNOSTICS)>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 16.

No : Go to 14.
CHECK LINE PRESSURE SOLENOID .
1. Turn the ignition switch to OFF.
2. Disconnect the TCM connector.
3. Measure the resistance between TCM connector and transmission body. (While wiggling the harness)
  Connector & terminal
  
  (B67) No. 32 - Transmission body:
Is the resistance approximately 3.3 - 7.3 Ω? (When cold)

Yes : Go to 16.

No : Go to 15.
CHECK HARNESS .
Check the transmission harness. (Open circuit, short circuit to power supply, short circuit to ground, and poor contact)

Connector & terminal

(B67) No. 17 - (T35) No. 1:

(B67) No. 4 - (T35) No. 2:

(B67) No. 3 - (T35) No. 3:

(B67) No. 32 - (T11) No. 1:

Is the check result OK?

Yes : Go to 16.

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 [Line Pressure Sensor Voltage.] in the [Data Monitor] of [Transmission]. (While shaking the line pressure sensor harness) Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR
Is [Line Pressure Sensor Voltage.] 0.39 - 0.61 V?

Yes : Go to 24.

No : Go to 17.
CHECK HARNESS .
1. Turn the ignition switch to OFF.
2. Disconnect the TCM connector.
3. Disconnect the line pressure sensor connector.
4. Measure the resistance between TCM connector and line pressure sensor connector. (While wiggling the harness)
  Connector & terminal
  
  (B67) No. 3 - (T35) No. 3:
  
  (B67) No. 4 - (T35) No. 2:
  
  (B67) No. 17 - (T35) No. 1:
Is the resistance less than 1 Ω?

Yes : Go to 18.

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

Connector & terminal

(B67) No. 3 - (B67) No. 17:

(B67) No. 4 - (B67) No. 3:

(B67) No. 17 - (B67) No. 4:

Is the resistance 1 MΩ or more?

Yes : Go to 19.

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

Connector & terminal

(B67) No. 3 - Transmission body:

(B67) No. 4 - Transmission body:

(B67) No. 17 - Transmission body:

Is the resistance 1 MΩ or more?

Yes : Go to 20.

No : Repair the short circuit of harness.
CHECK LINE PRESSURE SENSOR POWER SUPPLY .
1. Turn the ignition switch to ON.
2. Measure the voltage between TCM connectors.
  Connector & terminal
  
  (B67) No. 17 (+) - (B67) No. 3 (-):
Is the voltage 4.6 - 5.4 V?

Yes : Go to 21.

No : Check for poor contact of connector, and if no fault is found, replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM)
CHECK LINE PRESSURE SENSOR POWER SUPPLY .
1. Turn the ignition switch to OFF.
2. Connect the line pressure sensor connector.
3. Turn the ignition switch to ON.
4. Measure the voltage between TCM connectors.
  Connector & terminal
  
  (B67) No. 17 (+) - (B67) No. 3 (-):
Is the voltage 4.6 - 5.4 V?

Yes : Go to 22.

No : Replace the control valve body. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CONTROL VALVE BODY
CHECK LINE PRESSURE SENSOR OUTPUT .
Measure the voltage between TCM connectors.

Connector & terminal

(B67) No. 4 (+) - (B67) No. 3 (-):

Is the voltage 0.39 - 0.61 V?

Yes : Check for poor contact of connector, and if no fault is found, replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM)

No : Go to 23.
CHECK CONNECTOR .
1. Turn the ignition switch to OFF.
2. Disconnect the TCM connector.
3. Disconnect the line pressure sensor connector.
4. Check the TCM connector (B67) and the line pressure sensor connector (T35).
Is the check result OK?

Yes : Go to 24.

No : Repair the connector, or replace harness.
CHECK TCM INPUT SIGNAL (STALL TEST) .
1. Lift up the vehicle.
2. Start the engine.
3. Apply the parking brake.
4. Set the select lever to "D" range.
5. Depress the brake pedal firmly.
6. Slowly open the accelerator fully, and stabilize the engine speed.
7. Using the Subaru Select Monitor, read data of [Actual line press.] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR
Is the [Actual line press.] 6.0 MPa or more?

Yes : Replace the control valve body. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CONTROL VALVE BODY

No : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION ASSEMBLY
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)>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 28.

No : Go to 26.
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. (While wiggling the harness)
  Connector & terminal
  
  (B67) No. 46 - Transmission body:
Is the resistance approximately 3.3 - 7.3 Ω? (When cold)

Yes : Go to 28.

No : Go to 27.
CHECK HARNESS .
Check the transmission harness. (Open circuit, short circuit to power supply, short circuit to ground, and poor contact)

Connector & terminal

(B67) No. 33 - (T34) No. 1:

(B67) No. 5 - (T34) No. 2:

(B67) No. 2 - (T34) No. 3:

(B67) No. 46 - (T11) No. 4:

Is the check result OK?

Yes : Go to 28.

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)>DATA MONITOR
Is [secondary pressure sensor voltage.] 0.39 - 0.61 V?

Yes : Go to 36.

No : Go to 29.
CHECK HARNESS .
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. (While wiggling the harness)
  Connector & terminal
  
  (B67) No. 2 - (T34) No. 3:
  
  (B67) No. 5 - (T34) No. 2:
  
  (B67) No. 33 - (T34) No. 1:
Is the resistance less than 1 Ω?

Yes : Go to 30.

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

Connector & terminal

(B67) No. 2 - (B67) No. 33:

(B67) No. 5 - (B67) No. 2:

(B67) No. 33 - (B67) No. 5:

Is the resistance 1 MΩ or more?

Yes : Go to 31.

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

Connector & terminal

(B67) No. 2 - Transmission body:

(B67) No. 5 - Transmission body:

(B67) No. 33 - Transmission body:

Is the resistance 1 MΩ or more?

Yes : Go to 32.

No : Repair the short circuit of harness.
CHECK POWER SUPPLY FOR SECONDARY PRESSURE SENSOR .
1. Turn the ignition switch to ON.
2. Measure the voltage between TCM connectors.
  Connector & terminal
  
  (B67) No. 33 (+) - (B67) No. 2 (-):
Is the voltage 4.6 - 5.4 V?

Yes : Go to 33.

No : Check for poor contact of connector, and if no fault is found, replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>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
  
  (B67) No. 33 (+) - (B67) No. 2 (-):
Is the voltage 4.6 - 5.4 V?

Yes : Go to 34.

No : Replace the secondary pressure sensor. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>SECONDARY PRESSURE SENSOR
CHECK SECONDARY PRESSURE SENSOR OUTPUT .
Measure the voltage between TCM connectors.

Connector & terminal

(B67) No. 5 (+) - (B67) No. 2 (-):

Is the voltage 0.39 - 0.61 V?

Yes : Check for poor contact of connector, and if no fault is found, replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM)

No : Go to 35.
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 (B67) and the secondary pressure sensor connector (T34).
Is the check result OK?

Yes : Go to 36.

No : Repair the connector, or replace harness.
CHECK TCM INPUT SIGNAL (STALL TEST) .
1. Lift up the vehicle.
2. Start the engine.
3. Apply the parking brake.
4. Set the select lever to "D" range.
5. Depress the brake pedal firmly.
6. Slowly open the accelerator fully, and stabilize the engine speed.
7. Using the Subaru Select Monitor, read data of [Actual Secondary Pressure] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR
Is the [Actual Secondary Pressure] 6.0 MPa or more?

Yes : Replace the control valve body. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CONTROL VALVE BODY

No : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION ASSEMBLY