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Continuously Variable Transmission (Diagnostics): Diagnosis Subaru Outback BR

Automatic Trans 20 illustrations ~942 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.

Scheme 585

Scheme 585: WIRING DIAGRAM
Scheme 585: WIRING DIAGRAM
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 self diagnosis of the combination meter. Ref. to INSPECTION , 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 self diagnosis of the combination meter. Ref. to INSPECTION , Combination Meter System.
5 CHECK TCM. Read the data of ATF temperature using Subaru Select Monitor.Is 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.

DIAGNOSTIC PROCEDURE

  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.

Scheme 586

Scheme 586: WIRING DIAGRAM
Scheme 586: WIRING DIAGRAM
StepCheckYesNo
1 CHECK AWD LIGHT. Turn the ignition switch to ON.Does the AWD light illuminate?Go to step 2 .Perform self diagnosis of the combination meter. Ref. to INSPECTION , 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} from «AT related learning & inspecting mode», and check the current mode. Ref. to AWD ON/OFF SWITCHING MODE .Is the message "Currently, vehicle is AWD. Do you change 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 the {Rear differential inspection mode} from «AT related learning & inspecting mode», 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 self diagnosis of the combination meter. Ref. to INSPECTION , Combination Meter System.Is there any trouble with the combination meter?Repair the combination meter.Check the TCM.

DIAGNOSTIC PROCEDURE

Defective harness connector

Subaru Select Monitor communication failure

Scheme 587

Scheme 587: WIRING DIAGRAM
Scheme 587: WIRING DIAGRAM
StepCheckYesNo
1 CHECK INSTALLATION OF TCM CONNECTOR. Turn the ignition switch to OFF.Is TCM connector connected to TCM?Go to step 2 .Connect the TCM connector to TCM.
2 CHECK SUBARU SELECT MONITOR POWER SUPPLY CIRCUIT.. Measure the voltage between data link connector and chassis ground. Connector & terminal (B40) No. 16 (+) - Chassis ground (-)Is the voltage 10 V or more?Go to step 3 .Repair harness connector between the battery and data link connector, and poor contact of the connector.
3 CHECK SUBARU SELECT MONITOR GROUND CIRCUIT. Disconnect the ECM connector. Measure the resistance of harness between data link connector and ECM. Connector & terminal (B40) No. 4 - (B136) No. 4: (B40) No. 5 - (B136) No. 4Is the resistance less than 1 ohms?Go to step 4 .Repair the open circuit of harness between data link connector and ECM.
4 CHECK SUBARU SELECT MONITOR GROUND CIRCUIT. Measure the resistance of harness between data link connector and chassis ground. Connector & terminal (B40) No. 16 - Chassis groundIs the resistance 1 Mohms or more?Go to step 5 .Repair the short circuit of harness between data link connector and ground terminals.
5 CHECK ENGINE GROUND CIRCUIT. Check the engine ground circuit.Is the engine ground circuit normal?Go to step 6 .Repair ground circuit of ECM.
6 CHECK COMMUNICATION OF SUBARU SELECT MONITOR. Turn the ignition switch to ON. Check the communication with the transmission.Is the name of system displayed on Subaru Select Monitor?Go to step 11 .Go to step 7 .
7 CHECK COMMUNICATION OF SUBARU SELECT MONITOR. Turn the ignition switch to OFF. Disconnect the TCM connector. Turn the ignition switch to ON. Check communication with the engine system.Is the name of system displayed on Subaru Select Monitor?Go to step 9 .Go to step 8 .
8 CHECK OUTPUT SIGNAL OF TCM. Turn the ignition switch to OFF. Connect the connector to the TCM. Disconnect the control modules connectors which connecting to the data link connector (B40) No. 7, other than the TCM and ECM. CAUTION: When disconnecting the connector from airbag control module, always follow the precautions on AB article. Ref. to CAUTION , General Description. Turn the ignition switch to ON. Check communication with the transmission system.Is the name of system displayed on Subaru Select Monitor?Check each control module.Go to step 9 .
9 CHECK HARNESS CONNECTOR BETWEEN EACH CONTROL MODULE AND DATA LINK CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors of all control modules connected to the data link connector (B40) No. 7. Measure the resistance between data link connector and chassis ground. Connector & terminal (B40) No. 7 - Chassis groundIs the resistance 1 Mohms or more?Go to step 10 .Check harness and connector between each control module and data link connector.
10 CHECK OUTPUT SIGNAL OF TCM. Turn the ignition switch to ON. Measure the voltage between data link connector and chassis ground. Connector & terminal (B40) No. 7 (+) - Chassis ground (-)Is the voltage 1 V or more?Check harness and connector between each control module and data link connector.Go to step 11 .
11 CHECK HARNESS CONNECTOR BETWEEN TCM AND DATA LINK CONNECTOR. Disconnect the TCM connector. Measure the resistance between TCM connector and data link connector. Connector & terminal (B40) No. 7 - (B55) No. 19Is the resistance less than 1 ohms?Go to step 12 .Check the harness and connector between TCM and data link connector.
12 CHECK INSTALLATION OF TRANSMISSION HARNESS CONNECTOR.Is the transmission harness connector connected to bulkhead harness connector?Go to step 13 .Connect the bulkhead harness connector to transmission harness connector.
13 CHECK POOR CONTACT OF CONNECTORS.Is there poor contact of control module power supply and data link connector?Repair the poor contact.Go to step 14 .
14 CHECK TCM POWER SUPPLY. Disconnect the TCM connector. Turn the ignition switch to ON. Measure the 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. 22 (+) - Chassis ground (-)Is the voltage 10 - 13 V?Go to step 16 .Go to step 15 .
15 CHECK M/B FUSE (NO. 1). Turn the ignition switch to OFF. Remove the fuse (No. 1).Is the fuse (No. 1) blown out?Replace the fuse. If the replaced fuse blows out easily, repair the short circuit in the harness between the fuse and the TCM.Repair the open circuit of harness between the fuse and the TCM, or the fuse and battery, and poor contacts of connectors.
16 CHECK IGNITION POWER SUPPLY CIRCUIT. Turn the ignition switch to ON. Measure the ignition power supply voltage between TCM connector and chassis ground. Connector & terminal (B55) No. 21 (+) - Chassis ground (-)Is the voltage 10 - 13 V?Go to step 18 .Go to step 17 .
17 CHECK F/B FUSE (NO. 12). Remove the fuse (No. 12).Is the fuse (No. 12) blown out?Replace the fuse. If the replaced fuse blows out easily, repair the short circuit in the harness between the fuse and the TCM.Repair the open circuit of harness between the fuse and the TCM, or the fuse and battery, and poor contacts of connectors.
18 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance of harness between TCM and transmission connector. Connector & terminal (B54) No. 1 - (B11) No. 13: (B54) No. 14 - (B11) No. 20Is the resistance less than 1 ohms?Go to step 19 .Repair the open circuit of harness between TCM and transmission harness connector, and poor contact of connector.
19 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND TRANSMISSION GROUND. Measure the resistance of the harness between transmission and transmission ground. Connector & terminal (T4) No. 13 - Transmission ground: (T4) No. 20 - Transmission groundIs the resistance less than 1 ohms?Go to step 20 .Repair the open circuit of the harness between transmission and transmission ground.
20 CHECK POOR CONTACT OF CONNECTORS.Is there poor contact of TCM power supply, ground and data link connector?Repair the connector.Check the TCM.
CAUTION
When disconnecting the connector from airbag control module, always follow the precautions on AB article. Ref. to CAUTION , General Description.

DIAGNOSTIC PROCEDURE

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 588

Scheme 588: WIRING DIAGRAM
Scheme 588: WIRING DIAGRAM
StepCheckYesNo
1 CHECK INPUT SIGNAL FOR TCM. Turn the ignition switch to ON. Move the select lever to each range, read the data of "P, R, N, D range" 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 harness.
3 CHECK HARNESS. Disconnect the inhibitor switch connector. Measure the resistance between transmission connector and inhibitor switch connector. Connector & terminal (T3) No. 3 - (T7) No. 2: (T3) No. 2 - (T7) No. 5: (T3) No. 1 - (T7) No. 3: (T3) No. 8 - (T7) No. 4Is each resistance 1 Mohms or more?Go to step 4 .Repair the short circuit of 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 .
5 CHECK FOR POOR CONTACT.Is there poor contact between TCM, inhibitor switch, transmission ground?Repair the poor contact.Check the TCM.

DIAGNOSTIC 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 589

Scheme 589: WIRING DIAGRAM
Scheme 589: WIRING DIAGRAM
StepCheckYesNo
1 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. 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 2 .Repair the short circuit of harness.
2 CHECK HARNESS. Measure the resistance between TCM connector and transmission body. Connector & terminal (T4) No. 16 - Transmission body: (T4) No. 19 - Transmission bodyIs the resistance 1 Mohms or more?Go to step 3 .Repair the short circuit of harness.
3 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the transmission oil pan. Check for the harness pinch, damage.Is there any malfunction in harness?Go to step 4 .Replace the transmission harness.
4 CHECK ATF TEMPERATURE SENSOR. Measure the resistance between transmission connector terminals. Connector & terminal (T4) No. 16 - No. 19Is resistance as follows? 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.Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DIAGNOSTIC PROCEDURE

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

  1. Excessive shift shock
  2. Shift characteristics malfunction

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

  1. Gear is not shifted down when climbing a hill or driving down a hill.
  2. Neutral control does not operate.

Scheme 590

Scheme 590: WIRING DIAGRAM
Scheme 590: WIRING DIAGRAM
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. 3Is 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. 2 - 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.
5 CHECK INPUT SIGNAL FOR TCM. With brake pedal depressed, read the data of "Stop lamp SW" using Subaru Select Monitor.Is "ON" displayed?Current condition is normal. Check for poor contact of the connector or harness, and repair the fault location.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.

DIAGNOSTIC PROCEDURE

  1. Input signal circuit of TCM is open or shorted.
  2. Front wheel speed sensor malfunction
  1. Excessive shift shock on N --> D or N --> R.
  2. Driving performance is poor.
  3. Neutral control does not operate.

Scheme 591

Scheme 591: WIRING DIAGRAM
Scheme 591: WIRING DIAGRAM
StepCheckYesNo
1 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse (No. 38).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 (B54) No. 1 - (B11) No. 13: (B54) No. 20 - (B11) No. 12: (M/B No. 38) No. 2 - (B11) No. 7Is 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 (B11) No. 7 - Chassis ground: (B11) No. 12 - 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 and chassis ground. Connector & terminal (B11) No. 12 (+) - Chassis ground (-): NOTE: Delete the TCM memory after completing the CVT control system diagnosis. Ref. to CLEAR MEMORY MODE .Is the voltage approx. 5 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. Slowly increase the speed to 30 km/h (18 MPH). Read the data of "Front Wheel Speed" using Subaru Select Monitor.Does the value of "Front Wheel Speed" change according to the engine speed?Current condition is normal. Repair the poor contacts of harnesses of front wheel speed sensor and transmission connector.Go to step 6 .
6 CHECK TRANSMISSION HARNESS. Turn the ignition switch to OFF. Disconnect the transmission connector. Lift up the vehicle. Disconnect the front wheel speed sensor connector. Measure the resistance between transmission connector and front wheel speed sensor connector. Connector & terminal (T4) No. 7 - (AT5) No. 1: (T4) No. 12 - (AT5) No. 2: (T4) No. 13 - (AT5) No. 3Is the resistance less than 1 ohms?Replace the front wheel speed sensor. Ref. to FRONT WHEEL SPEED SENSOR .Replace the transmission harness.
NOTE
Delete the TCM memory after completing the CVT control system diagnosis. Ref. to CLEAR MEMORY MODE .

DIAGNOSTIC PROCEDURE

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

  1. Gear is not shifted down when driving a down hill.
  2. Neutral control does not operate.
  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.Is the ATF OK?Go to step 2 .Check according to the "corrective action" of ATF (CVTF) "CONDITION CHECK". Ref. to CONDITION CHECK , CVTF.
2 CHECK TRANSMISSION FLUID. Check the amount of ATF. Ref. to ADJUSTMENT , CVTF.Is the ATF amount correct?Go to step 3 .Adjust the amount of ATF. 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 "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. Read the data of "Actual Gear Ratio" using Subaru Select Monitor.Is "Actual Gear Ratio" 2.0 - 2.4?Go to step 5 .Go to step 6 .
5 CHECK INPUT SIGNAL FOR TCM. Set the select lever to the "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 "Actual Gear Ratio" 0.5 - 0.8?Go to step 6 .Replace the 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 .If there is shift problems, abrupt increase of engine speed, standing start problems, replace the transmission assembly. Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . If it is normal, temporary poor contact occurs.

DIAGNOSTIC 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.Is the ATF OK?Go to step 2 .Check according to the "corrective action" of ATF (CVTF) "CONDITION CHECK". Ref. to CONDITION CHECK , CVTF.
2 CHECK TRANSMISSION FLUID. Check the amount of ATF. Ref. to ADJUSTMENT , CVTF.Is the ATF amount correct?Go to step 3 .Adjust the amount of ATF. 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 "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 3000 RPM. Read the data of "Actual secondary pressure" using Subaru Select Monitor.Is "Actual secondary pressure" higher than Step 3 value? Does the value change according to the engine speed, and is the value is 1.5 - 2.5 MPa?Go to step 5 .Go to step 6 .
5 CHECK TCM INPUT SIGNAL (STALL TEST). Apply the electronic parking brake. Set the select lever to the "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 "Actual secondary pressure" higher than Step 4 value? Does the value change according to the engine speed, and is the value is 5.0 - 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 .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 .If there is shift problems, abrupt increase of engine speed, standing start problems, replace the transmission assembly. Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . If it is normal, temporary poor contact occurs.

DIAGNOSTIC PROCEDURE

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

Shift characteristics malfunction

Scheme 592

Scheme 592: WIRING DIAGRAM
Scheme 592: WIRING DIAGRAM
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 "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 (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 (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 (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 .Check for poor contact of the connector, and repair the fault location.

DIAGNOSTIC 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.

Scheme 593

Scheme 593: WIRING DIAGRAM
Scheme 593: WIRING DIAGRAM
StepCheckYesNo
1 CHECK HARNESS. Disconnect the TCM and self shut relay connectors. Measure the resistance between TCM connector and self shut relay connector. Connector & terminal (B55) No. 20 - (B494) No. 1: (B55) No. 2 - (B494) No. 3: (B55) No. 11 - (B494) No. 3: (B55) No. 22 - (B494) No. 3Is the resistance less than 1 ohms?Go to step 2 .Repair the open circuit of harness.
2 CHECK HARNESS. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B55) No. 20 - Chassis ground: (B55) No. 2 - Chassis ground: (B55) No. 11 - Chassis ground: (B55) No. 22 - Chassis groundIs the resistance 1 Mohms or more?Go to step 3 .Repair the short circuit of harness.
3 CHECK RELAY POWER SUPPLY. Measure the voltage between self shut relay connector and chassis ground. Connector & terminal (B494) No. 2 (+) - Chassis ground (-): (B494) No. 4 (+) - Chassis ground (-)Is the voltage 10 V or more?Go to step 4 .Repair the open or short circuit of harness.
4 CHECK SELF SHUT RELAY. Measure the resistance between self shut relay terminals. Connector & terminal (B494) No. 1 - (B494) No. 2Is the resistance 110 - 140 ohms?Go to step 5 .Replace the self shut relay.
5 CHECK SELF SHUT RELAY. Measure the resistance between self shut relay terminals. Connector & terminal (B494) No. 3 - (B494) No. 4Is the resistance 1 Mohms or more?Go to step 6 .Replace the self shut relay.
6 CHECK INPUT SIGNAL FOR TCM. Connect the connectors of TCM and self shut relay. Read the data of "Battery voltage" using Subaru Select Monitor.Is the "Battery voltage" 10 V or more?Current condition is normal. Check for poor contact of the connector or harness, and repair the fault location.Go to step 7 .
7 CHECK FOR POOR CONTACT.Is there poor contact of the self shut relay circuit?Repair the poor contact.Check the TCM.

DIAGNOSTIC PROCEDURE

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

Manual mode can not be set.

Scheme 594

Scheme 594: WIRING DIAGRAM
Scheme 594: WIRING DIAGRAM
StepCheckYesNo
1 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the manual mode switch connector. Measure the resistance between manual mode switch connector and chassis ground. Connector & terminal (B116) No. 8 - Chassis groundIs the resistance less than 1 ohms?Go to step 2 .Repair the open circuit of harness.
2 CHECK MANUAL MODE SWITCH. Measure the resistance between manual mode switch terminals. Connector & terminal (B116) No. 7 - No. 8Is the resistance 1 Mohms or more?Go to step 3 .Replace the select lever assembly. Ref. to SELECT LEVER .
3 CHECK MANUAL MODE SWITCH. Shift the select lever to manual mode. Measure the resistance between manual mode switch terminals. Connector & terminal (B116) No. 7 - No. 8Is the resistance less than 1 ohms?Go to step 4 .Replace the select lever assembly. Ref. to SELECT LEVER .
4 CHECK HARNESS. Disconnect the TCM connector. Measure the resistance between TCM connector and manual mode switch connector. Connector & terminal (B116) No. 7 - (B55) No. 4Is the resistance less than 1 ohms?Go to step 5 .Repair the open circuit of harness or poor contact of connector.
5 CHECK HARNESS. Measure the resistance between manual mode switch connector and chassis ground. Connector & terminal (B116) No. 7 - Chassis groundIs the resistance 1 Mohms or more?Go to step 6 .Repair the short circuit of harness.
6 CHECK INPUT SIGNAL FOR TCM. Connect the TCM and manual mode switch connector. Turn the ignition switch to ON. Set the select lever to the "D" range. Read the "Manual Mode Switch" data using the Subaru Select Monitor.Does "Manual Mode Switch" display "ON" with select lever in manual mode, and "OFF" with select lever in other than manual mode?Current condition is normal.Go to step 7 .
7 CHECK FOR POOR CONTACT.Is there poor contact of the manual mode switch circuit?Repair the poor contact.Check the TCM.

DIAGNOSTIC PROCEDURE

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 595

Scheme 595: WIRING DIAGRAM
Scheme 595: WIRING DIAGRAM
StepCheckYesNo
1 CHECK INPUT SIGNAL FOR TCM. After driving with warm up condition, park the vehicle while depressing the brake 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 (T4) No. 5 - Transmission bodyIs the resistance approx. 7 ohms? (when engine cold)Check for poor contact of the connector, and repair the fault location.Go to step 4 .
4 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the transmission oil pan. Check for the harness pinch, damage.Is there any malfunction in harness?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 (T4) No. 5 - Transmission bodyIs the resistance 1 Mohms or more?Replace the control valve body. Ref. to CONTROL VALVE BODY .Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DIAGNOSTIC 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.Is the ATF OK?Go to step 2 .Check according to the "corrective action" of ATF (CVTF) "CONDITION CHECK". Ref. to CONDITION CHECK , CVTF.
2 CHECK TRANSMISSION FLUID. Check the amount of ATF. Ref. to ADJUSTMENT , CVTF.Is the ATF amount correct?Go to step 3 .Adjust the amount of ATF. 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 "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 .Is the stall test normal?Go to step 5 .If the engine speed increases abruptly, replace the 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 .If there is abrupt increase of engine speed, standing start problems, replace the transmission assembly. Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . If it is normal, temporary poor contact occurs.

DIAGNOSTIC PROCEDURE

Output signal circuit of F&R solenoid is shorted.

Excessive shift shock

Scheme 596

Scheme 596: WIRING DIAGRAM
Scheme 596: WIRING DIAGRAM
StepCheckYesNo
1 CHECK INPUT SIGNAL FOR TCM. After driving with warm up condition, park the vehicle while depressing the brake at "D" range. Read the data of "Commanded Forward & Reverse Linear Solenoid Current" and "Actual Forward & Reverse Linear Solenoid Current" using Subaru Select Monitor.Does the value of "Commanded Forward & Reverse Linear Solenoid Current" and "Actual Forward & Reverse Linear Solenoid 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 (T4) No. 9 - Transmission bodyIs the resistance approx. 6 ohms? (when engine cold)Check for poor contact of the connector, and repair the fault location.Go to step 4 .
4 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the transmission oil pan. Check for the harness pinch, damage.Is there any malfunction in harness?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 (T4) No. 9 - Transmission bodyIs the resistance 1 Mohms or more?Replace the control valve body. Ref. to CONTROL VALVE BODY .Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DIAGNOSTIC 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 597

Scheme 597: WIRING DIAGRAM
Scheme 597: WIRING DIAGRAM
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 (T4) No. 4 - Transmission bodyIs the resistance approx. 4 ohms? (when engine cold)Check for poor contact of the connector, and repair the fault location.Go to step 3 .
3 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the transmission oil pan. Check for the harness pinch, damage.Is there any malfunction in harness?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 (T4) No. 4 - Transmission bodyIs the resistance 1 Mohms or more?Replace the control valve body. Ref. to CONTROL VALVE BODY .Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DIAGNOSTIC 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 598

Scheme 598: WIRING DIAGRAM
Scheme 598: WIRING DIAGRAM
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 (T4) No. 6 - Transmission bodyIs the resistance approx. 13 ohms? (when engine cold)Check for poor contact of the connector, and repair the fault location.Go to step 3 .
3 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the transmission oil pan. Check for the harness pinch, damage.Is there any malfunction in harness?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 (T4) No. 6 - Transmission bodyIs the resistance 1 Mohms or more?Replace the control valve body. Ref. to CONTROL VALVE BODY .Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DIAGNOSTIC 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 599

Scheme 599: WIRING DIAGRAM
Scheme 599: WIRING DIAGRAM
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 (T4) No. 1 - Transmission bodyIs the resistance approx. 13 ohms? (when engine cold)Check for poor contact of the connector, and repair the fault location.Go to step 3 .
3 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the transmission oil pan. Check for the harness pinch, damage.Is there any malfunction in harness?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 (T4) No. 1 - Transmission bodyIs the resistance 1 Mohms or more?Replace the control valve body. Ref. to CONTROL VALVE BODY .Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DIAGNOSTIC PROCEDURE

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

Gear is not changed. (No down-shift)

  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 procedure.
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 procedure.
4 PERFORM AT LEARNING. Perform the {Clear Memories 2}. 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 INDICATION OF DTC. 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.

DIAGNOSTIC 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. Neutral control does not operate.

Scheme 600

Scheme 600: WIRING DIAGRAM
Scheme 600: WIRING DIAGRAM
StepCheckYesNo
1 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse (No. 38).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 (B54) No. 1 - (B12) No. 7: (B54) No. 6 - (B12) No. 6: (M/B No. 38) No. 2 - (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 (B12) No. 5 - Chassis ground: (B12) 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 and chassis ground. Connector & terminal (B12) No. 6 (+) - Chassis ground (-): NOTE: Delete the TCM memory after completing the CVT control system diagnosis. Ref. to CLEAR MEMORY MODE .Is the voltage approx. 5 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. Slowly increase the speed to 30 km/h (18 MPH). Read the data of "Primary Pulley Speed" using Subaru Select Monitor.Does the value of "Primary Pulley Speed" change according to the engine 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 (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 .Replace the transmission harness.
NOTE
Delete the TCM memory after completing the CVT control system diagnosis. Ref. to CLEAR MEMORY MODE .

DIAGNOSTIC PROCEDURE

  1. Output signal circuit of secondary speed sensor is open or shorted.
  2. Secondary speed sensor malfunction
  1. Shock occurs when selecting N --> D, N --> R.
  2. Neutral control does not operate.

Scheme 601

Scheme 601: WIRING DIAGRAM
Scheme 601: WIRING DIAGRAM
StepCheckYesNo
1 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse (No. 38).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 (B54) No. 7 - (B11) No. 10: (B54) No. 14 - (B11) No. 20: (M/B No. 38) No. 2 - (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 (B11) No. 10 - Chassis ground: (B11) No. 11 - 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 and chassis ground. Connector & terminal (B11) No. 10 (+) - Chassis ground (-): NOTE: Delete the TCM memory after completing the CVT control system diagnosis. Ref. to CLEAR MEMORY MODE .Is the voltage approx. 5 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. Slowly increase the speed to 30 km/h (18 MPH). Read the data of "Secondary Pulley Speed" using Subaru Select Monitor.Does the value of "Secondary Pulley Speed" change according to the vehicle 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 (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 .Replace the transmission harness.
NOTE
Delete the TCM memory after completing the CVT control system diagnosis. Ref. to CLEAR MEMORY MODE .

DIAGNOSTIC PROCEDURE

  1. Lock up clutch malfunction
  2. Hydraulic leaks or hydraulic valve stick of lock up system
  3. Hydraulic leaks or hydraulic valve stick of lock up ON/OFF valve system
  4. Lock up duty solenoid or lock up ON/OFF solenoid characteristics malfunction
  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.Is the ATF OK?Go to step 4 .Check according to the "corrective action" of ATF (CVTF) "CONDITION CHECK". 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.
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 "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 . Start the engine after turning the ignition switch OFF. Warm up until the ATF temperature exceeds 50°C. Drive the vehicle for one minutes or more 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, "Lock-Up ON/OFF Solenoid" is ON, "Front Wheel Speed" is 40 km/h or more. Turn the ignition switch to OFF. Start the engine. Perform the procedure in step 4) 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 . When DTC other than P2762 is displayed, perform the diagnosis corresponding to the DTC.Current condition is normal. Temporary oil pressure malfunction.

DIAGNOSTIC PROCEDURE

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

No lock-up occurs.

Scheme 602

Scheme 602: WIRING DIAGRAM
Scheme 602: WIRING DIAGRAM
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 (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 (T4) No. 2 - Transmission bodyIs the resistance approx. 13 ohms? (when engine cold)Check for poor contact of the connector, and repair the fault location.Go to step 4 .
4 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the transmission oil pan. Check for the harness pinch, damage.Is there any malfunction in harness?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 (T4) No. 2 (+) - Transmission body (-)Is the voltage approx. 0 V?Replace the control valve body. Ref. to CONTROL VALVE BODY .Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DIAGNOSTIC 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.

Scheme 603

Scheme 603: WIRING DIAGRAM
Scheme 603: WIRING DIAGRAM
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. 23 - Chassis groundIs the resistance 1 Mohms or more?Go to step 2 .Repair the short circuit of harness.
2 CHECK LOCK UP ON/OFF SOLENOID. Measure the resistance between transmission connector and transmission body. Connector & terminal (T4) No. 3 - Transmission bodyIs the resistance approx. 17 ohms? (when engine cold)Check for poor contact of the connector, and repair the fault location.Go to step 3 .
3 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the transmission oil pan. Check for the harness pinch, damage.Is there any malfunction in harness?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 (T4) No. 3 - Transmission bodyIs the resistance 1 Mohms or more?Replace the control valve body. Ref. to CONTROL VALVE BODY .Replace the transmission harness.
CAUTION
Start work after ATF cools down.

DIAGNOSTIC PROCEDURE

Output signal circuit of lock-up duty 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.

Scheme 604

Scheme 604: WIRING DIAGRAM
Scheme 604: WIRING DIAGRAM
StepCheckYesNo
1 CHECK TCM. Check the DTC relating the TCM using the Subaru Select Monitor.Is only DTC P1725 displayed?Perform self diagnosis of the combination meter.Go to step 2 .
2 CHECK TCM. Check the DTC relating the TCM using the Subaru Select Monitor.Are DTCs other than P1725 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. 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 5 .Perform the diagnosis according to DTC P0951.
5 CHECK TCM. Shift up the select lever. Read the "Shift step in Manu. mode" data using the Subaru Select Monitor.Is "2" displayed?Currently, shift indicator is normal.Check the TCM.

DIAGNOSTIC PROCEDURE

INSPECTION

SymptomsProblem 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 Electronic parking brake 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.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

SYMPTOMS CHART

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