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Continuously Variable Transmission (Diagnostics): Diagnosis Subaru Forester SJ

Automatic Trans 26 illustrations ~1426 words

DIAGNOSIS

  1. AT OIL TEMP light circuit is open or shorted.
  2. Combination meter malfunction
  3. TCM is in special control mode.
  4. AT learning is not finished.

TROUBLE SYMPTOM

  1. When the ignition switch is turned to ON, the AT OIL TEMP light does not illuminate.
  2. AT OIL TEMP light remains lit after engine start.
StepCheckYesNo
1 CHECK AT OIL TEMP LIGHT. Turn the ignition switch to ON.Does the AT OIL TEMP light illuminate?Go to step 2 .Perform the self-diagnosis of combination meter. < Ref. to SELF-DIAGNOSIS DISPLAY MODE , OPERATION, Combination Meter System. >
2 CHECK AT OIL TEMP LIGHT. Start the engine.Does AT OIL TEMP light go off after two seconds from engine start?Current condition is normal. Go back to Basic Diagnostic Procedure. < Ref. to BASIC DIAGNOSTIC PROCEDURE . >Go to step 3 .
3 CHECK DTC. Read the DTC relating the TCM using the Subaru Select Monitor.Is DTC displayed?Perform the diagnosis according to DTC.Go to step 4 .
4 CHECK TCM. Read the data of «ATF Temperature Lamp» using the Subaru Select Monitor.Is "ON" displayed?Go to step 5 .Perform the self-diagnosis of combination meter. < Ref. to SELF-DIAGNOSIS DISPLAY MODE , OPERATION, Combination Meter System. >
5 CHECK TCM. Read the data of «ATF Temp.» using the Subaru Select Monitor.Is the display 125°C or more?Go to step 6 .Check the TCM.
6 CHECK ATF TEMPERATURE. Check the real fluid temperature from the transmission case surface temperature.Does it clearly differ from the «ATF Temp.» displayed on Subaru Select Monitor?Perform the diagnosis according to DTC P0712 procedure. If there is no problems, perform the diagnosis according to DTC P0713 procedure.When ATF temperature can be judged as actually high, perform the diagnosis again after the ATF temperature lowers.
  1. AWD light circuit is open or shorted.
  2. Combination meter malfunction
  3. TCM is in AWD special control mode.
  1. When the ignition switch is turned to ON, the AWD light does not illuminate.
  2. AWD light remains lit after engine start.
  3. AWD light is blinking immediately after engine start.
StepCheckYesNo
1 CHECK AWD LIGHT. Turn the ignition switch to ON.Does the AWD light illuminate?Go to step 2 .Perform the self-diagnosis of combination meter. < Ref. to SELF-DIAGNOSIS DISPLAY MODE , OPERATION, Combination Meter System. >
2 CHECK AWD LIGHT. Start the engine.Does AWD light go off after two seconds from engine start?Current condition is normal. Go back to Basic Diagnostic Procedure. < Ref. to BASIC DIAGNOSTIC PROCEDURE . >Go to step 3 .
3 CHECK DTC. Read the DTC relating the TCM using the Subaru Select Monitor.Is DTC displayed?Perform the diagnosis according to DTC.Go to step 4 .
4 CHECK AWD LIGHT. Check the display of AWD light after engine start.Is AWD light illuminating?Go to step 6 .Go to step 5 .
5 CHECK AWD LIGHT. Check the display of AWD light after engine start.Is AWD light blinking at 2 Hz?Go to step 7 .Go to step 8 .
6 CHECK AWD ON/OFF SWITCHING FUNCTION. Using the Subaru Select Monitor, select the {AWD ON/OFF switching mode} in {Maintenance mode} from «Work Support», and check the current mode. < Ref. to AWD ON/OFF SWITCHING MODE . > < Ref. to AWD ON/OFF SWITCHING MODE . >Is the message «At present, the vehicle is in AWD. Switch to FF?» displayed?Go to step 8 .If the message «At present, the vehicle is in FF. Switch to AWD?» is displayed, select "OK", and switch to AWD mode.
7 CHECK REAR DIFFERENTIAL. Using the Subaru Select Monitor, select {Rear differential inspection mode} in {Maintenance mode} from «Work Support», and check. < Ref. to REAR DIFFERENTIAL INSPECTION MODE . >Does AWD light go off after inspection is finished normally?Current condition is normal. Go back to Basic Diagnostic Procedure. < Ref. to BASIC DIAGNOSTIC PROCEDURE . >Go to step 8 .
8 CHECK COMBINATION METER. Perform the self-diagnosis of combination meter. < Ref. to SELF-DIAGNOSIS DISPLAY MODE , OPERATION, Combination Meter System. >Is there any trouble with the combination meter?Repair the combination meter.Check the TCM.

Defective harness connector

Subaru Select Monitor communication failure

Scheme 909

Scheme 909: WIRING DIAGRAM
Scheme 909: WIRING DIAGRAM

Scheme 910

Scheme 910
Scheme 910
  1. Non-turbo model CVT control system < Ref. to «NON-TURBO MODEL»(ref-662145-S35292137642014101300000) , WIRING DIAGRAM, CVT Control System. >
  2. Turbo model CVT control system < Ref. to «TURBO MODEL»(ref-662145-S23151071822014101300000) , WIRING DIAGRAM, CVT Control System. >
StepCheckYesNo
1 CHECK IGNITION SWITCH.Is the ignition switch ON?Go to step 2 .Turn the ignition switch to ON, and select the transmission mode using the Subaru Select Monitor.
2 CHECK BATTERY. Turn the ignition switch to OFF. Measure the battery voltage.Is the voltage 11 V or more?Go to step 3 .Charge or replace the battery.
3 CHECK BATTERY TERMINAL.Is there poor contact at battery terminal?Repair or tighten the battery terminal.Go to step 4 .
4 CHECK INSTALLATION OF TCM CONNECTOR. Turn the ignition switch to OFF.Is the TCM connector inserted into the TCM until the clamp locks?Go to step 5 .Insert the TCM connector to TCM.
5 CHECK LAN SYSTEM. Perform the diagnosis for LAN system. < Ref. to BASIC DIAGNOSTIC PROCEDURE . >Is there any fault in LAN system?Perform the diagnosis according to DTC for LAN system. < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 6 .
6 CHECK SUBARU SELECT MONITOR COMMUNICATION. Turn the ignition switch to ON. Check whether communication to transmission system can be executed normally.Is the system name displayed on Subaru Select Monitor?Check DTC of TCM. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 7 .
7 CHECK POWER SUPPLY CIRCUIT. Turn the ignition switch to ON. (engine OFF) Measure the ignition power supply voltage between TCM connector and chassis ground. Connector & terminal (B55) No. 1 (+) - Chassis ground (-): (B55) No. 2 (+) - Chassis ground (-): (B55) No. 11 (+) - Chassis ground (-): (B55) No. 21 (+) - Chassis ground (-): (B55) No. 22 (+) - Chassis ground (-)Is the voltage 10 - 13 V?Go to step 8 .Repair the open circuit of harness between TCM and battery.
8 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Turn the ignition switch to OFF. Disconnect the connector from TCM. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B54) No. 1 - Chassis groundIs the resistance less than 10 ohms?Go to step 9 .Repair the open circuit of the TCM ground circuit and poor contact of connector.
9 CHECK POOR CONTACT OF CONNECTOR.Is there poor contact of control module power supply, ground circuit and data link connector?Repair the connector.Check the TCM.

DTC DETECTING CONDITION

  1. Inhibitor switch is faulty.
  2. At least 2 range signal is input.
  1. Shift characteristics are erroneous.
  2. The range position of the select lever and the position of shift indicator display do not match.

Scheme 911

Scheme 911: WIRING DIAGRAM
Scheme 911: WIRING DIAGRAM

Scheme 912

Scheme 912
Scheme 912
  1. Non-turbo model CVT control system < Ref. to «NON-TURBO MODEL»(ref-662145-S35292137642014101300000) , WIRING DIAGRAM, CVT Control System. >
  2. Turbo model CVT control system < Ref. to «TURBO MODEL»(ref-662145-S23151071822014101300000) , WIRING DIAGRAM, CVT Control System. >
StepCheckYesNo
1 CHECK INPUT SIGNAL FOR TCM. Turn the ignition switch to ON. Move the select lever to each range, and read the data of «P range», «R Range Signal», «N range» and «D Range Signal» using the Subaru Select Monitor.Is display "OFF" for the range other than corresponding range?Go to step 5 .Go to step 2 .
2 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B54) No. 5 - Chassis ground: (B54) No. 18 - Chassis ground: (B54) No. 9 - Chassis ground: (B54) No. 22 - Chassis groundIs each resistance 1 Mohms or more?Go to step 3 .Repair the short circuit of body harness.
3 CHECK HARNESS. Disconnect the inhibitor switch connector. Measure the resistance between transmission connector and chassis ground. Connector & terminal Non-turbo model (T3) No. 1 - Chassis ground: (T3) No. 2 - Chassis ground: (T3) No. 3 - Chassis ground: (T3) No. 4 - Chassis ground: Turbo model (T3) No. 3 - Chassis ground: (T3) No. 2 - Chassis ground: (T3) No. 1 - Chassis ground: (T3) No. 8 - Chassis groundIs each resistance 1 Mohms or more?Go to step 4 .Repair the short circuit of transmission harness.
4 CHECK INHIBITOR SWITCH. Move the select lever to each range, and measure the resistance between inhibitor switch connector terminals. Connector & terminal (T7) No. 2 - (T7) No. 1: (T7) No. 5 - (T7) No. 1: (T7) No. 3 - (T7) No. 1: (T7) No. 4 - (T7) No. 1Is the resistance other than corresponding range 1 Mohms or more?Go to step 5 .Replace the inhibitor switch. < Ref. to INHIBITOR SWITCH . > < Ref. to INHIBITOR SWITCH . >
5 CHECK FOR POOR CONTACT.Is there poor contact between TCM, inhibitor switch, transmission ground?Repair the poor contact.Check the TCM.

DTC PROCEDURE

  1. Inhibitor switch is faulty.
  2. No range signal is input.
  1. Shift characteristics are erroneous.
  2. The range position of the select lever and the position of shift indicator display do not match.

Input signal circuit of ATF temperature sensor is shorted.

  1. Excessive shift shock
  2. Shift characteristics malfunction

Scheme 913

Scheme 913: WIRING DIAGRAM
Scheme 913: WIRING DIAGRAM

Scheme 914

Scheme 914
Scheme 914
  1. Non-turbo model CVT control system < Ref. to «NON-TURBO MODEL»(ref-662145-S35292137642014101300000) , WIRING DIAGRAM, CVT Control System. >
  2. Turbo model CVT control system < Ref. to «TURBO MODEL»(ref-662145-S23151071822014101300000) , WIRING DIAGRAM, CVT Control System. >
StepCheckYesNo
1 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM connector. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B54) No. 3 - Chassis ground: (B54) No. 16 - Chassis groundIs the resistance 1 Mohms or more?Go to step 5 .Go to step 2 .
2 CHECK HARNESS. Disconnect the transmission connector. Measure the resistance between transmission connector and transmission body. Connector & terminal Non-turbo model (T4) No. 5 - Transmission body: (T4) No. 9 - Transmission body: Turbo model (T4) No. 16 - Transmission body: (T4) No. 19 - Transmission bodyIs the resistance 1 Mohms or more?Repair the short circuit of body harness.Go to step 3 .
3 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the following parts. Transmission valve cover (non-turbo model) Transmission oil pan (turbo model) Check for the harness pinch, damage.Is the harness normal?Non-turbo model Go to step 4 . Turbo model Go to step 5 .Replace the transmission harness.
4 CHECK HARNESS. Disconnect the control valve body connector. Measure the resistance between control valve body connector and transmission body. Connector & terminal (T11) No. 1 - Transmission body: (T11) No. 6 - Transmission bodyIs the resistance 1 Mohms or more?Replace the transmission harness.Go to step 5 .
5 CHECK ATF TEMPERATURE SENSOR. Measure the resistance between transmission connector terminals. Connector & terminal Non-turbo model (T4) No. 5 - No. 9: Turbo model (T4) No. 16 - No. 19Is resistance as follows? Non-turbo model Fluid temperature 0°C --> Approx. 6.0 kohms Fluid temperature 20°C --> Approx. 2.5 kohms Fluid temperature 80°C --> Approx. 330 ohms Turbo model Fluid temperature 0°C --> Approx. 6.2 kohms Fluid temperature 20°C --> Approx. 2.6 kohms Fluid temperature 80°C --> Approx. 370 ohmsCheck the TCM.Non-turbo model Replace the control valve body. < Ref. to CONTROL VALVE BODY . > Turbo model Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DTC PROCEDURE

Input signal circuit of ATF temperature sensor is open or shorted.

  1. Excessive shift shock
  2. Shift characteristics malfunction
  1. Input signal circuit of TCM is open or shorted.
  2. Turbine speed sensor is faulty.
  1. Standing start problems
  2. Shock occurs when engaging the lockup clutch.
  3. Shock occurs when selecting shift position.

Brake switch malfunction or input signal circuit of brake switch is open or shorted.

Gear is not shifted down when climbing a hill or driving down a hill.

Scheme 915

Scheme 915: WIRING DIAGRAM
Scheme 915: WIRING DIAGRAM

Scheme 916

Scheme 916
Scheme 916
  1. Non-turbo model (without EyeSight and X mode) Stop light system < Ref. to «EXTERIOR LIGHTS»(ref-607950-S40606767522014040300000) NON-TURBO MODEL (WITHOUT EyeSight AND X MODE), WIRING DIAGRAM, Stop Light System. >
  2. Except for non-turbo model (without EyeSight and X mode) Stop light system < Ref. to «EXTERIOR LIGHTS»(ref-607950-S40606767522014040300000) EXCEPT FOR NON-TURBO MODEL (WITHOUT EyeSight AND X MODE), WIRING DIAGRAM, Stop Light System. >
StepCheckYesNo
1 CHECK FUSE (NO. 8). Turn the ignition switch to OFF. Remove the fuse (No. 8).Is the fuse (No. 8) blown out?Replace the fuse (No. 8). If the new fuse (No. 8) has blown out easily, repair the short circuit of harness between fuse (No. 8) and stop light switch.Go to step 2 .
2 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and stop light switch connector. Measure the resistance between TCM connector and stop light switch connector. Connector & terminal (B55) No. 13 - (B65) No. 4Is the resistance less than 1 ohms?Go to step 3 .Repair the open circuit of harness.
3 CHECK HARNESS. Measure the resistance between TCM connector and fuse (No. 8). Connector & terminal (B65) No. 3 - fuse (No. 8)Is the resistance less than 1 ohms?Go to step 4 .Repair the open circuit of harness.
4 CHECK INPUT SIGNAL FOR TCM. Install the fuse (No. 8). Connect the TCM and stop light switch connector. Depress the brake pedal. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B55) No. 13 (+) - Chassis ground (-)Is the voltage 10 V or more?Go to step 5 .Replace the stop light switch. < Ref. to STOP LIGHT SWITCH . >
5 CHECK INPUT SIGNAL FOR TCM. With brake pedal depressed, read the data of «Stop Light Switch» using Subaru Select Monitor.Is "ON" displayed?Current condition is normal. Check for poor contact in connectors or harnesses, and repair the defective part.Go to step 6 .
6 CHECK FOR POOR CONTACT.Is there poor contact of input signal of stop light switch?Repair the poor contact.Check the TCM.

DTC PROCEDURE

  1. Input signal circuit of TCM is open or shorted.
  2. Front wheel speed sensor malfunction
  1. Shock occurs when selecting shift position.
  2. Shift control malfunction

Brake switch malfunction or input signal circuit of brake switch is shorted.

Gear is not shifted down when climbing a hill or driving down a hill.

  1. Control valve hydraulic circuit malfunction
  2. Primary UP solenoid, primary Down solenoid characteristics malfunction
  3. CVT chain slippage
  1. Acceleration is poor during standing start.
  2. Shift control malfunction
  3. Engine speed increases abruptly.
StepCheckYesNo
1 CHECK TRANSMISSION FLUID. Check the condition of ATF. < Ref. to CONDITION CHECK , CVTF. > < Ref. to CONDITION CHECK , CVTF. >Is the ATF OK?Go to step 2 .Check according to the "corrective action" of ATF (CVTF) "CONDITION CHECK". < Ref. to CONDITION CHECK , CVTF. > < Ref. to CONDITION CHECK , CVTF. >
2 CHECK TRANSMISSION FLUID. Check the amount of ATF. < Ref. to ADJUSTMENT , CVTF. > < Ref. to ADJUSTMENT , CVTF. >Is the ATF amount correct?Go to step 3 .Adjust the amount of ATF. < Ref. to ADJUSTMENT , CVTF. > < Ref. to ADJUSTMENT , CVTF. >
3 CHECK INPUT SIGNAL FOR TCM. Lift up the vehicle. Start the engine. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F). Shift the select lever to "P" range. Stabilize the engine speed at idle. Read the data of «Actual secondary pressure » using Subaru Select Monitor.Is the «Actual secondary pressure » 0.5 - 1.5 MPa?Go to step 4 .Perform the diagnosis according to DTC P0841 procedure.
4 CHECK INPUT SIGNAL FOR TCM. Set the select lever to "D" range. Release the brake pedal to stabilize the engine speed and front wheel speed. Read the data of «Actual Gear Ratio» using Subaru Select Monitor.Is the «Actual Gear Ratio» as follows? Non-turbo model 1.5 - 2.6 Turbo model 2.0 - 2.4Go to step 5 .Go to step 6 .
5 CHECK INPUT SIGNAL FOR TCM. Set the select lever to "D" range. Slowly increase the speed to 40 km/h (24 MPH) and keep the constant speed. Read the data of «Actual Gear Ratio» using Subaru Select Monitor.Is the «Actual Gear Ratio» as follows? Non-turbo model 0.5 - 0.9 Turbo model 0.5 - 0.8Go to step 6 .Replace the transmission assembly. < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . > < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . >
6 DRIVING CHECK BY INSPECTION MODE. Turn the ignition switch to OFF. Perform a drive check based on the "Inspection Mode". < Ref. to INSPECTION MODE . >Does the AT OIL TEMP light blink and is DTC P0730 displayed?Replace the transmission assembly. < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . > < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . >If there is shift problems, abrupt increase of engine speed, standing start problems, replace the transmission assembly. < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . > < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . > If it is normal, temporary poor contact occurs.

DTC PROCEDURE

  1. Control valve hydraulic circuit malfunction
  2. Secondary pressure sensor fault or characteristics malfunction
  1. Acceleration is poor during standing start.
  2. Shift control malfunction
  3. Engine speed increases abruptly.
StepCheckYesNo
1 CHECK TRANSMISSION FLUID. Check the condition of ATF. < Ref. to CONDITION CHECK , CVTF. > < Ref. to CONDITION CHECK , CVTF. >Is the ATF OK?Go to step 2 .Check according to the "corrective action" of ATF (CVTF) "CONDITION CHECK". < Ref. to CONDITION CHECK , CVTF. > < Ref. to CONDITION CHECK , CVTF. >
2 CHECK TRANSMISSION FLUID. Check the amount of ATF. < Ref. to ADJUSTMENT , CVTF. > < Ref. to ADJUSTMENT , CVTF. >Is the ATF amount correct?Go to step 3 .Adjust the amount of ATF. < Ref. to ADJUSTMENT , CVTF. > < Ref. to ADJUSTMENT , CVTF. >
3 CHECK INPUT SIGNAL FOR TCM. Lift up the vehicle. Start the engine. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F). Shift the select lever to "P" range. Stabilize the engine speed at idle. Read the data of «Actual secondary pressure » using Subaru Select Monitor.Is the «Actual secondary pressure » 0.5 - 1.5 MPa?Go to step 4 .Go to step 6 .
4 CHECK INPUT SIGNAL FOR TCM. Keep the engine speed at 3, 000 rpm. Read the data of «Actual secondary pressure » using Subaru Select Monitor.Is the «Actual secondary pressure » higher than step 3 value? Does the value change according to the engine speed, within the range of 1.5 - 2.5 MPa?Go to step 5 .Go to step 6 .
5 CHECK TCM INPUT SIGNAL (STALL TEST). Apply the parking brake. Set the select lever to "D" range. Depress the brake pedal firmly. Slowly open the accelerator fully, and stabilize the engine speed. Read the data of «Actual secondary pressure » using Subaru Select Monitor.Is the «Actual secondary pressure » higher than step 4 value? Does the value change according to the engine speed, within the range of 4.5 - 6.0 MPa?Go to step 7 .Go to step 6 .
6 CHECK SECONDARY PRESSURE SENSOR.Is the secondary pressure sensor damaged from the standpoint of appearance?Replace the secondary pressure sensor. < Ref. to SECONDARY PRESSURE SENSOR . > < Ref. to SECONDARY PRESSURE SENSOR . >Perform the diagnosis according to DTC P0842, P0843 procedure.
7 DRIVING CHECK BY INSPECTION MODE. Turn the ignition switch to OFF. Perform a drive check based on the "Inspection Mode". < Ref. to INSPECTION MODE . >Does the AT OIL TEMP light blink and is DTC P0841 displayed?Perform the secondary pressure test. < Ref. to SECONDARY PRESSURE (LINE PRESSURE) TEST . > < Ref. to SECONDARY PRESSURE (LINE PRESSURE) TEST . >If there is shift problems, abrupt increase of engine speed, standing start problems, replace the transmission assembly. < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . > < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . > If it is normal, temporary poor contact occurs.

DTC PROCEDURE

Input signal circuit of secondary pressure sensor is open or shorted.

Shift characteristics malfunction

Scheme 917

Scheme 917: WIRING DIAGRAM
Scheme 917: WIRING DIAGRAM

Scheme 918

Scheme 918
Scheme 918
  1. Non-turbo model CVT control system < Ref. to «NON-TURBO MODEL»(ref-662145-S35292137642014101300000) , WIRING DIAGRAM, CVT Control System. >
  2. Turbo model CVT control system < Ref. to «TURBO MODEL»(ref-662145-S23151071822014101300000) , WIRING DIAGRAM, CVT Control System. >
StepCheckYesNo
1 CHECK INPUT SIGNAL FOR TCM. Start the engine. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F). Shift the select lever to "P" range. Stabilize the engine speed at idle. Read the data of «Actual secondary pressure » using Subaru Select Monitor.Is the «Actual secondary pressure » 0.5 - 1.5 MPa?Check for poor contact of connector.Go to step 2 .
2 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance between TCM connector and transmission connectors. Connector & terminal Non-turbo model (B54) No. 2 - (B12) No. 12: (B54) No. 15 - (B12) No. 10: (B54) No. 17 - (B12) No. 11: Turbo model (B54) No. 2 - (B11) No. 17: (B54) No. 15 - (B11) No. 18: (B54) No. 17 - (B11) No. 14Is the resistance less than 1 ohms?Go to step 3 .Repair the open circuit of harness.
3 CHECK HARNESS. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B54) No. 2 - Chassis ground: (B54) No. 17 - Chassis groundIs the resistance 1 Mohms or more?Go to step 4 .Repair the short circuit of harness.
4 CHECK TRANSMISSION HARNESS. Disconnect the secondary pressure sensor connector. Measure the resistance between transmission connector and secondary pressure sensor connector. Connector & terminal Non-turbo model (T3) No. 10 - (AT6) No. 3: (T3) No. 11 - (AT6) No. 2: (T3) No. 12 - (AT6) No. 1: Turbo model (T4) No. 14 - (AT6) No. 2: (T4) No. 17 - (AT6) No. 1: (T4) No. 18 - (AT6) No. 3Is the resistance less than 1 ohms?Go to step 5 .Repair the open circuit of harness.
5 CHECK TRANSMISSION HARNESS. Measure the resistance between transmission connector and chassis ground. Connector & terminal Non-turbo model (T3) No. 11 - Chassis ground: (T3) No. 12 - Chassis ground: Turbo model (T4) No. 14 - Chassis ground: (T4) No. 17 - Chassis groundIs the resistance 1 Mohms or more?Go to step 6 .Repair the short circuit of harness.
6 CHECK SENSOR POWER SUPPLY. Connect the connectors of TCM and transmission. Turn the ignition switch to ON. Measure the voltage between secondary pressure sensor connector terminals. Connector & terminal (AT6) No. 1 (+) - (AT6) No. 3 (-)Is the voltage 4.5 V or more?Replace the secondary pressure sensor. < Ref. to SECONDARY PRESSURE SENSOR . > < Ref. to SECONDARY PRESSURE SENSOR . >Check for poor contact of the connector, and repair the defective part.

DTC PROCEDURE

Input signal circuit of secondary pressure sensor is shorted.

Shift characteristics malfunction

  1. Power supply circuit of TCM is open or shorted.
  2. Self shut relay malfunction

Gear is not changed.

CAUTIONAfter diagnosis, perform Clear Memory Mode for ECM. < Ref. to CLEAR MEMORY MODE . > < Ref. to CLEAR MEMORY MODE . >

Input signal circuit of manual mode switch is open or shorted.

Manual mode can not be set.

Output signal circuit of secondary solenoid is shorted.

  1. Engine speed increases abruptly, and can not start.
  2. Engine speed increases abruptly during driving.

Scheme 919

Scheme 919: WIRING DIAGRAM
Scheme 919: WIRING DIAGRAM

Scheme 920

Scheme 920
Scheme 920
  1. Non-turbo model CVT control system < Ref. to «NON-TURBO MODEL»(ref-662145-S35292137642014101300000) , WIRING DIAGRAM, CVT Control System. >
  2. Turbo model CVT control system < Ref. to «TURBO MODEL»(ref-662145-S23151071822014101300000) , WIRING DIAGRAM, CVT Control System. >
StepCheckYesNo
1 CHECK INPUT SIGNAL FOR TCM. After driving with warm up condition, park the vehicle while depressing the brake pedal at "N" range. Read the data of «Sec. Sol. Set Current» and «Sec. Sol. Actual Current» using Subaru Select Monitor.Does the value of «Sec. Sol. Set Current» and «Sec. Sol. Actual Current» almost correspond?Check for poor contact of connector.Go to step 2 .
2 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B54) No. 12 - Chassis groundIs the resistance 1 Mohms or more?Go to step 3 .Repair the short circuit of harness.
3 CHECK SECONDARY SOLENOID. Measure the resistance between transmission connector and transmission body. Connector & terminal Non-turbo model (T4) No. 6 - Transmission body: Turbo model (T4) No. 5 - Transmission bodyIs the resistance approx. 7 ohms? (when engine cold)Check for poor contact of the connector, and repair the defective part.Go to step 4 .
4 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the following parts. Transmission valve cover (non-turbo model) Transmission oil pan (turbo model) Check for the harness pinch, damage.Is the harness normal?Go to step 5 .Replace the transmission harness.
5 CHECK HARNESS INSIDE TRANSMISSION. Disconnect the control valve body connector. Measure the resistance between transmission connector and transmission body. Connector & terminal Non-turbo model (T4) No. 6 - Transmission body: Turbo model (T4) No. 5 - Transmission bodyIs the resistance 1 Mohms or more?Replace the control valve body. < Ref. to CONTROL VALVE BODY . > < Ref. to CONTROL VALVE BODY . >Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DTC PROCEDURE

  1. Output signal circuit of secondary solenoid is open or shorted.
  2. Secondary solenoid has open circuit inside.
  1. Engine speed increases abruptly, and can not start.
  2. Engine speed increases abruptly during driving.
  1. Control valve hydraulic circuit malfunction
  2. F&R solenoid characteristics malfunction
  3. Clutch slippage caused by forward clutch facing deterioration
  4. Clutch slippage caused by hydraulic pressure leaks
  1. Engine speed increases abruptly, and can not accelerate.
  2. Excessive slippage is felt.
StepCheckYesNo
1 CHECK TRANSMISSION FLUID. Check the condition of ATF. < Ref. to CONDITION CHECK , CVTF. > < Ref. to CONDITION CHECK , CVTF. >Is the ATF OK?Go to step 2 .Check according to the "corrective action" of ATF (CVTF) "CONDITION CHECK". < Ref. to CONDITION CHECK , CVTF. > < Ref. to CONDITION CHECK , CVTF. >
2 CHECK TRANSMISSION FLUID. Check the amount of ATF. < Ref. to ADJUSTMENT , CVTF. > < Ref. to ADJUSTMENT , CVTF. >Is the ATF amount correct?Go to step 3 .Adjust the amount of ATF. < Ref. to ADJUSTMENT , CVTF. > < Ref. to ADJUSTMENT , CVTF. >
3 CHECK INPUT SIGNAL FOR TCM. Start the engine. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F). Shift the select lever to "P" range. Stabilize the engine speed at idle. Read the data of «Actual secondary pressure » using Subaru Select Monitor.Is the «Actual secondary pressure » 0.5 - 1.5 MPa?Go to step 4 .Perform the diagnosis according to DTC P0841 procedure.
4 STALL TEST. Perform the stall test. < Ref. to STALL TEST . > < Ref. to STALL TEST . >Is the stall test normal?Go to step 5 .If the engine speed increases abruptly, replace the transmission assembly. < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . > < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . >
5 DRIVING CHECK BY INSPECTION MODE. Turn the ignition switch to OFF. Perform a drive check based on the "Inspection Mode". < Ref. to INSPECTION MODE . >Does the AT OIL TEMP light blink and is DTC P0965 displayed?Replace the transmission assembly. < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . > < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . >If there is abrupt increase of engine speed, standing start problems, replace the transmission assembly. < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . > < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . > If it is normal, temporary poor contact occurs.

DTC PROCEDURE

Output signal circuit of F&R solenoid is shorted.

Excessive shift shock

Scheme 921

Scheme 921: WIRING DIAGRAM
Scheme 921: WIRING DIAGRAM

Scheme 922

Scheme 922
Scheme 922
  1. Non-turbo model CVT control system < Ref. to «NON-TURBO MODEL»(ref-662145-S35292137642014101300000) , WIRING DIAGRAM, CVT Control System. >
  2. Turbo model CVT control system < Ref. to «TURBO MODEL»(ref-662145-S23151071822014101300000) , WIRING DIAGRAM, CVT Control System. >
StepCheckYesNo
1 CHECK INPUT SIGNAL FOR TCM. After driving with warm up condition, park the vehicle while depressing the brake pedal at "D" range. Read the data of «F&R Linear Solenoid Set Current» and «F&R Linear Solenoid Actual Current » using Subaru Select Monitor.Does the value of «F&R Linear Solenoid Set Current» and «F&R Linear Solenoid Actual Current» almost correspond?Check for poor contact of connector.Go to step 2 .
2 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B54) No. 11 - Chassis groundIs the resistance 1 Mohms or more?Go to step 3 .Repair the short circuit of harness.
3 CHECK F&R SOLENOID. Measure the resistance between transmission connector and transmission body. Connector & terminal Non-turbo model (T4) No. 7 - Transmission body: Turbo model (T4) No. 9 - Transmission bodyIs the resistance approx. 6 ohms? (when engine cold)Check for poor contact of the connector, and repair the defective part.Go to step 4 .
4 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the following parts. Transmission valve cover (non-turbo model) Transmission oil pan (turbo model) Check for the harness pinch, damage.Is the harness normal?Go to step 5 .Replace the transmission harness.
5 CHECK HARNESS INSIDE TRANSMISSION. Disconnect the control valve body connector. Measure the resistance between transmission connector and transmission body. Connector & terminal Non-turbo model (T4) No. 7 - Transmission body: Turbo model (T4) No. 9 - Transmission bodyIs the resistance 1 Mohms or more?Replace the control valve body. < Ref. to CONTROL VALVE BODY . > < Ref. to CONTROL VALVE BODY . >Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DTC PROCEDURE

  1. Output signal circuit of F&R solenoid is open or shorted.
  2. F&R solenoid has open circuit inside.

Engine speed increases abruptly, and can not start.

Output signal circuit of AWD solenoid is shorted.

Drivability getting worse.

Scheme 923

Scheme 923: WIRING DIAGRAM
Scheme 923: WIRING DIAGRAM

Scheme 924

Scheme 924
Scheme 924
  1. Non-turbo model CVT control system < Ref. to «NON-TURBO MODEL»(ref-662145-S35292137642014101300000) , WIRING DIAGRAM, CVT Control System. >
  2. Turbo model CVT control system < Ref. to «TURBO MODEL»(ref-662145-S23151071822014101300000) , WIRING DIAGRAM, CVT Control System. >
StepCheckYesNo
1 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B54) No. 13 - Chassis groundIs the resistance 1 Mohms or more?Go to step 2 .Repair the short circuit of harness.
2 CHECK AWD SOLENOID. Measure the resistance between transmission connector and transmission body. Connector & terminal Non-turbo model (T4) No. 8 - Transmission body: Turbo model (T4) No. 4 - Transmission bodyIs the resistance approx. 4 ohms? (when engine cold)Check for poor contact of the connector, and repair the defective part.Go to step 3 .
3 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the following parts. Transmission valve cover (non-turbo model) Transmission oil pan (turbo model) Check for the harness pinch, damage.Is the harness normal?Go to step 4 .Replace the transmission harness.
4 CHECK HARNESS INSIDE TRANSMISSION. Disconnect the control valve body connector. Measure the resistance between transmission connector and transmission body. Connector & terminal Non-turbo model (T4) No. 8 - Transmission body: Turbo model (T4) No. 4 - Transmission bodyIs the resistance 1 Mohms or more?Replace the control valve body. < Ref. to CONTROL VALVE BODY . > < Ref. to CONTROL VALVE BODY . >Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DTC PROCEDURE

  1. Output signal circuit of AWD solenoid is open or shorted.
  2. AWD solenoid has open circuit inside.
  1. Tight corner braking phenomenon occurs.
  2. Drivability getting worse.

Output signal circuit of primary UP solenoid is shorted.

Gear is not changed. (No up-shift)

Scheme 925

Scheme 925: WIRING DIAGRAM
Scheme 925: WIRING DIAGRAM

Scheme 926

Scheme 926
Scheme 926
  1. Non-turbo model CVT control system < Ref. to «NON-TURBO MODEL»(ref-662145-S35292137642014101300000) , WIRING DIAGRAM, CVT Control System. >
  2. Turbo model CVT control system < Ref. to «TURBO MODEL»(ref-662145-S23151071822014101300000) , WIRING DIAGRAM, CVT Control System. >
StepCheckYesNo
1 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B54) No. 24 - Chassis groundIs the resistance 1 Mohms or more?Go to step 2 .Repair the short circuit of harness.
2 CHECK PRIMARY UP SOLENOID. Measure the resistance between transmission connector and transmission body. Connector & terminal Non-turbo model (T4) No. 2 - Transmission body: Turbo model (T4) No. 6 - Transmission bodyIs the resistance approx. 13 ohms? (when engine cold)Check for poor contact of the connector, and repair the defective part.Go to step 3 .
3 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the following parts. Transmission valve cover (non-turbo model) Transmission oil pan (turbo model) Check for the harness pinch, damage.Is the harness normal?Go to step 4 .Replace the transmission harness.
4 CHECK HARNESS INSIDE TRANSMISSION. Disconnect the control valve body connector. Measure the resistance between transmission connector and transmission body. Connector & terminal Non-turbo model (T4) No. 2 - Transmission body: Turbo model (T4) No. 6 - Transmission bodyIs the resistance 1 Mohms or more?Replace the control valve body. < Ref. to CONTROL VALVE BODY . > < Ref. to CONTROL VALVE BODY . >Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DTC PROCEDURE

Output signal circuit of primary UP solenoid is open or shorted.

Gear is not changed. (No up-shift)

Output signal circuit of primary DOWN solenoid is shorted.

Gear is not changed. (No down-shift)

Scheme 927

Scheme 927: WIRING DIAGRAM
Scheme 927: WIRING DIAGRAM

Scheme 928

Scheme 928
Scheme 928
  1. Non-turbo model CVT control system < Ref. to «NON-TURBO MODEL»(ref-662145-S35292137642014101300000) , WIRING DIAGRAM, CVT Control System. >
  2. Turbo model CVT control system < Ref. to «TURBO MODEL»(ref-662145-S23151071822014101300000) , WIRING DIAGRAM, CVT Control System. >
StepCheckYesNo
1 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B54) No. 25 - Chassis groundIs the resistance 1 Mohms or more?Go to step 2 .Repair the short circuit of harness.
2 CHECK PRIMARY DOWN SOLENOID. Measure the resistance between transmission connector and transmission body. Connector & terminal Non-turbo model (T4) No. 3 - Transmission body: Turbo model (T4) No. 1 - Transmission bodyIs the resistance approx. 13 ohms? (when engine cold)Check for poor contact of the connector, and repair the defective part.Go to step 3 .
3 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the following parts. Transmission valve cover (non-turbo model) Transmission oil pan (turbo model) Check for the harness pinch, damage.Is the harness normal?Go to step 4 .Replace the transmission harness.
4 CHECK HARNESS INSIDE TRANSMISSION. Disconnect the control valve body connector. Measure the resistance between transmission connector and transmission body. Connector & terminal Non-turbo model (T4) No. 3 - Transmission body: Turbo model (T4) No. 1 - Transmission bodyIs the resistance 1 Mohms or more?Replace the control valve body. < Ref. to CONTROL VALVE BODY . > < Ref. to CONTROL VALVE BODY . >Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DTC PROCEDURE

Output signal circuit of primary DOWN solenoid is open or shorted.

Gear is not changed. (No down-shift)

DTC P170A: L-RANGE SW SYSTEM

Note. Refer to "DTC P0951 MANUAL SWITCH" for diagnostic procedure. < Ref. to DTC P0951 MANUAL SWITCH , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >

  1. TCM EEPROM malfunction
  2. EEPROM writing error during self shut control
  1. AT learning is not finished.
  2. Shock occurs when selecting N --> D, N --> R.
StepCheckYesNo
1 CHECK TCM CONNECTOR.Is the connection of TCM connector correct?Go to step 2 .Connect the TCM connector.
2 CHECK SELF SHUT RELAY. Turn the ignition switch to ON.Does the relay operates simultaneously?Go to step 3 .Perform the diagnosis according to DTC P0890.
3 CHECK SELF SHUT RELAY. Turn the ignition switch to OFF.Does the relay operate after two or three seconds delay?Go to step 4 .Perform the diagnosis according to DTC P0890.
4 PERFORM AT LEARNING. Perform {Clear AT learning value}. Perform the AT learning. < Ref. to LEARNING CONTROL . > Start the engine.Does the AT OIL TEMP light blink after AT learning is finished correctly?Check the TCM.Go to step 5 .
5 CHECK DTC DISPLAY. Perform the {Clear Memory}. Turn the ignition switch to OFF. Start the engine after 10 seconds. Repeat steps 2 ) and 3 ).Does the AT OIL TEMP light blink and is DTC P1724 displayed?Check the TCM.Current condition is normal. Check for poor contact of TCM connector or harness.

DTC PROCEDURE

  1. Output signal circuit of primary speed sensor is open or shorted.
  2. Primary speed sensor malfunction
  1. Standing start problems
  2. Shock occurs when engaging the lockup clutch.
  3. Shock occurs when selecting shift position.

Scheme 929

Scheme 929: WIRING DIAGRAM
Scheme 929: WIRING DIAGRAM

Scheme 930

Scheme 930
Scheme 930
  1. Non-turbo model CVT control system < Ref. to «NON-TURBO MODEL»(ref-662145-S35292137642014101300000) , WIRING DIAGRAM, CVT Control System. >
  2. Turbo model CVT control system < Ref. to «TURBO MODEL»(ref-662145-S23151071822014101300000) , WIRING DIAGRAM, CVT Control System. >
StepCheckYesNo
1 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse (7.5 A) from the fuse holder.Is the fuse OK?Go to step 2 .Replace the fuse. If the fuse blows out easily, repair the short circuit of harness.
2 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance between TCM connector and transmission connectors. Connector & terminal Non-turbo model (B54) No. 1 - (B12) No. 7: (B54) No. 6 - (B12) No. 8: (B550) No. 20 - (B12) No. 6: Turbo model (B54) No. 1 - (B12) No. 7: (B54) No. 6 - (B12) No. 6: (B550) No. 20 - (B12) No. 5Is the resistance less than 1 ohms?Go to step 3 .Repair the open circuit of harness.
3 CHECK HARNESS. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B54) No. 6 - Chassis groundIs the resistance 1 Mohms or more?Go to step 4 .Repair the short circuit of harness.
4 CHECK TRANSMISSION HARNESS. Connect the TCM connector. Turn the ignition switch to ON. Measure the voltage between transmission connector terminals. Connector & terminal Non-turbo model (B12) No. 6 (+) - (B12) No. 7 (-): Turbo model (B12) No. 5 (+) - (B12) No. 7 (-)Is the voltage 10 - 13 V?Go to step 5 .Repair the open circuit of harness or poor contact of connector.
5 CHECK INPUT SIGNAL FOR TCM. Turn the ignition switch to OFF. Connect the transmission connector. Lift up the vehicle. Start the engine. Set the select lever to "D" range. Read the data of «Primary Pulley Speed» using Subaru Select Monitor.Does the value of «Primary Pulley Speed» change according to those of «Turbine Revolution Speed»?Current condition is normal. Repair the poor contacts of harnesses of primary speed sensor and transmission connector.Go to step 6 .
6 CHECK TRANSMISSION HARNESS. Turn the ignition switch to OFF. Disconnect the transmission connector. Disconnect the primary speed sensor connector. Measure the resistance between transmission connector and primary speed sensor connector. Connector & terminal Non-turbo model (T3) No. 6 - (AT1) No. 3: (T3) No. 7 - (AT1) No. 1: (T3) No. 8 - (AT1) No. 2: Turbo model (T3) No. 5 - (AT1) No. 1: (T3) No. 6 - (AT1) No. 2: (T3) No. 7 - (AT1) No. 3Is the resistance less than 1 ohms?Replace the primary speed sensor. < Ref. to PRIMARY SPEED SENSOR . > < Ref. to PRIMARY SPEED SENSOR . >Replace the transmission harness.

DTC PROCEDURE

  1. Output signal circuit of secondary speed sensor is open or shorted.
  2. Secondary speed sensor malfunction
  1. Shifting shock is felt.
  2. Acceleration is poor during standing start.
  3. Shift control malfunction

Scheme 931

Scheme 931: WIRING DIAGRAM
Scheme 931: WIRING DIAGRAM

Scheme 932

Scheme 932
Scheme 932
  1. Non-turbo model CVT control system < Ref. to «NON-TURBO MODEL»(ref-662145-S35292137642014101300000) , WIRING DIAGRAM, CVT Control System. >
  2. Turbo model CVT control system < Ref. to «TURBO MODEL»(ref-662145-S23151071822014101300000) , WIRING DIAGRAM, CVT Control System. >
StepCheckYesNo
1 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse (7.5 A) from the fuse holder.Is the fuse OK?Go to step 2 .Replace the fuse. If the fuse blows out easily, repair the short circuit of harness.
2 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance between TCM connector and transmission connectors. Connector & terminal Non-turbo model (B54) No. 1 - (B12) No. 7: (B54) No. 7 - (B12) No. 5: (B550) No. 20 - (B12) No. 6: Turbo model (B54) No. 7 - (B11) No. 10: (B54) No. 14 - (B11) No. 20: (B550) No. 20 - (B11) No. 11Is the resistance less than 1 ohms?Go to step 3 .Repair the open circuit of harness.
3 CHECK HARNESS. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B54) No. 7 - Chassis groundIs the resistance 1 Mohms or more?Go to step 4 .Repair the short circuit of harness.
4 CHECK TRANSMISSION HARNESS. Connect the TCM connector. Turn the ignition switch to ON. Measure the voltage between transmission connector terminals. Connector & terminal Non-turbo model (B12) No. 6 (+) - (B12) No. 7 (-): Turbo model (B11) No. 11 (+) - (B11) No. 20 (-)Is the voltage 10 - 13 V?Go to step 5 .Repair the open circuit of harness or poor contact of connector.
5 CHECK INPUT SIGNAL FOR TCM. Turn the ignition switch to OFF. Connect the transmission connector. Lift up the vehicle. Start the engine. Set the select lever to "D" range. Read the data of «Secondary Pulley Speed» using Subaru Select Monitor.Does the value of «Secondary Pulley Speed» change according to those of «Front Wheel Speed»?Current condition is normal. Repair the poor contacts of harnesses of secondary speed sensor and transmission connector.Go to step 6 .
6 CHECK TRANSMISSION HARNESS. Turn the ignition switch to OFF. Disconnect the transmission connector. Disconnect the secondary speed sensor connector. Measure the resistance between transmission connector and secondary speed sensor connector. Connector & terminal Non-turbo model (T3) No. 5 - (AT4) No. 2: (T3) No. 6 - (AT4) No. 3: (T3) No. 7 - (AT4) No. 1: Turbo model (T4) No. 10 - (AT4) No. 2: (T4) No. 11 - (AT4) No. 3: (T4) No. 20 - (AT4) No. 1Is the resistance less than 1 ohms?Replace the secondary speed sensor. < Ref. to SECONDARY SPEED SENSOR . > < Ref. to SECONDARY SPEED SENSOR . >Replace the transmission harness.

DTC PROCEDURE

  1. Lock up clutch malfunction
  2. Hydraulic leaks or hydraulic valve stick of lock up system
  1. No lock-up occurs.
  2. Engine speed increases abruptly during driving.
StepCheckYesNo
1 CHECK DTC. Read the DTC relating the ECM using the Subaru Select Monitor.Is DTC displayed?Perform the diagnosis according to DTC.Go to step 2 .
2 CHECK DTC. Read the DTC relating the TCM using the Subaru Select Monitor.Are DTC P0841, P0842, P0843 displayed?Perform the diagnosis according to DTC.Go to step 3 .
3 CHECK TRANSMISSION FLUID. Check the condition of ATF. < Ref. to CONDITION CHECK , CVTF. > < Ref. to CONDITION CHECK , CVTF. >Is the ATF OK?Go to step 4 .Check according to the "corrective action" of ATF (CVTF) "CONDITION CHECK". < Ref. to CONDITION CHECK , CVTF. > < Ref. to CONDITION CHECK , CVTF. >
4 CHECK TRANSMISSION FLUID. Check the amount of ATF. < Ref. to ADJUSTMENT , CVTF. >Is the ATF amount correct?Go to step 5 .Adjust the amount of ATF. < Ref. to ADJUSTMENT , CVTF. > < Ref. to ADJUSTMENT , CVTF. >
5 CHECK INPUT SIGNAL FOR TCM. Lift up the vehicle. Start the engine. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F). Shift the select lever to "P" range. Stabilize the engine speed at idle. Read the data of «Actual secondary pressure » using Subaru Select Monitor.Is the «Actual secondary pressure » 0.5 - 1.5 MPa?Go to step 6 .Perform the diagnosis according to DTC P0841 procedure.
6 DRIVING CHECK FOR LOCK-UP CONDITION. Perform the " CLEAR MEMORY MODE ". < Ref. to CLEAR MEMORY MODE . > Turn the ignition switch to OFF. Start the engine. Warm up until the ATF temperature exceeds 50°C. Drive the vehicle for one minute or more while keeping the constant speed so that the display shown in the Subaru Select Monitor is as follows: «Lock Up Duty Ratio» is 70 % or more, and «Front Wheel Speed» is 40 km/h or more. Turn the ignition switch to OFF. Start the engine. Perform the procedure in step 5 ) again. Read the DTC using Subaru Select Monitor.Does the AT OIL TEMP light blink and is DTC P2762 displayed?Perform the secondary pressure test. < Ref. to SECONDARY PRESSURE (LINE PRESSURE) TEST . > < Ref. to SECONDARY PRESSURE (LINE PRESSURE) TEST . > When DTC other than P2762 is displayed, perform the diagnosis corresponding to the DTC.Current condition is normal. Temporary oil pressure malfunction.

DTC PROCEDURE

Output signal circuit of lock-up duty solenoid is open or shorted.

Engine stalls.

Scheme 933

Scheme 933: WIRING DIAGRAM
Scheme 933: WIRING DIAGRAM

Scheme 934

Scheme 934
Scheme 934
  1. Non-turbo model CVT control system < Ref. to «NON-TURBO MODEL»(ref-662145-S35292137642014101300000) , WIRING DIAGRAM, CVT Control System. >
  2. Turbo model CVT control system < Ref. to «TURBO MODEL»(ref-662145-S23151071822014101300000) , WIRING DIAGRAM, CVT Control System. >
StepCheckYesNo
1 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance between TCM connector and transmission connectors. Connector & terminal Non-turbo model (B54) No. 26 - (B11) No. 11: Turbo model (B54) No. 26 - (B11) No. 2Is the resistance less than 1 ohms?Go to step 2 .Repair the open circuit of harness.
2 CHECK HARNESS. Turn the ignition switch to ON. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 26 (+) - Chassis ground (-)Is the voltage approx. 0 V?Go to step 3 .Repair the short circuit of harness.
3 CHECK LOCK-UP DUTY SOLENOID. Measure the resistance between transmission connector and transmission body. Connector & terminal Non-turbo model (T4) No. 11 - Transmission body: Turbo model (T4) No. 2 - Transmission bodyIs the resistance approx. 13 ohms? (when engine cold)Check for poor contact of the connector, and repair the defective part.Go to step 4 .
4 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the following parts. Transmission valve cover (non-turbo model) Transmission oil pan (turbo model) Check for the harness pinch, damage.Is the harness normal?Go to step 5 .Replace the transmission harness.
5 CHECK HARNESS INSIDE TRANSMISSION. Disconnect the control valve body connector. Turn the ignition switch to ON. Measure the voltage between transmission connector and transmission body. Connector & terminal Non-turbo model (T4) No. 11 (+) - Transmission body (-): Turbo model (T4) No. 2 (+) - Transmission body (-)Is the voltage approx. 0 V?Replace the control valve body. < Ref. to CONTROL VALVE BODY . > < Ref. to CONTROL VALVE BODY . >Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DTC PROCEDURE

Output signal circuit of lock up duty solenoid is shorted.

No lock-up occurs.

Output signal circuit of lock up ON/OFF solenoid is shorted.

No lock-up occurs.

Output signal circuit of lock up ON/OFF solenoid is open or shorted.

No lock-up occurs.

  1. Output signal circuit of shift indicator is open or shorted.
  2. Combination meter malfunction
  1. Shift indicator does not display or remains displayed.
  2. Shift indicator display does not change.
StepCheckYesNo
1 CHECK TCM. Check the DTC relating the TCM using the Subaru Select Monitor.Is DTC U0155 or U0423 displayed?Perform the self-diagnosis of combination meter.Go to step 2 .
2 CHECK TCM. Check the DTC relating the TCM using the Subaru Select Monitor.Are DTCs other than U0155 and U0423 displayed?Perform the diagnosis according to DTC.Go to step 3 .
3 CHECK COMBINATION METER. Check the DTC of combination meter.Is DTC displayed?Perform the diagnosis according to DTC.Go to step 4 .
4 CHECK TCM. Operate the + side of the paddle shift switch. Read the data of «Up Switch» using the Subaru Select Monitor.Does it change between ON and OFF according to the operation?Go to step 5 .Check for poor contact between TCM and paddle shift UP switch, and repair the defective part.
5 CHECK TCM. Operate the - side of the paddle shift switch. Read the data of «Down Switch» using the Subaru Select Monitor.Does it change between ON and OFF according to the operation?Go to step 6 .Check for poor contact between TCM and paddle shift down switch, and repair the defective part.
6 CHECK TCM. Turn the ignition switch OFF, then turn it ON again. Shift the select lever to manual mode. Read the "Shift step in Manu. mode" data using the Subaru Select Monitor.Is "1" displayed?Go to step 7 .Perform the diagnosis according to DTC P0951.
7 CHECK TCM. Shift up the paddle shift switch. Read the "Shift step in Manu. mode" data using the Subaru Select Monitor.Is "2" displayed?Currently, shift indicator is normal.Check the TCM.

DTC PROCEDURE

INSPECTION

SymptomsFaulty parts
Engine stalls when driving in "D" or "R" range, or selecting "N" --> "D", "N" --> "R".Control valve Engine control system
While driving in "D" range, vibration occurs immediately before the stop or engine stalls.Control valve Torque converter
Vehicle cannot shift while driving in "D" range.Control valve TCM Shift mechanism Power supply system
Excessive shock when selecting "N" --> "D", and "N" --> "R".Control valve TCM F&R clutch pack ATF deterioration or lack
Excessive shock at standing start in "D" range.Control valve TCM F&R clutch pack ATF deterioration or lack
Engine speed increases abruptly during driving in "D" or "R" range.Control valve Secondary pressure sensor F&R clutch pack ATF deterioration or lack
Vehicle can not start when depressing the accelerator pedal in "D" or "R" range, or acceleration is very poor. (without abrupt engine increase)Control valve F&R clutch pack Shift mechanism Parking mechanism Engine control system Power supply system
Shift indicator in combination meter displays the position which differs from select lever position.Inhibitor switch Select cable related Combination meter
Manual mode enters even though the select lever and paddle shift switch is not operated.Manual mode switch Paddle shift switch Select lever TCM
Engine speed increases abruptly in "D" or "R" range, vehicle can not start.F&R clutch pack Select cable related
Manual mode can not be setSelect lever TCM

More articles — Continuously Variable Transmission (Diagnostics)