DIAGNOSIS
- AT OIL TEMP light circuit is open or shorted.
- Combination meter malfunction
- TCM is in special control mode.
- AT learning is not finished.
TROUBLE SYMPTOM
- When the ignition switch is turned to ON, the AT OIL TEMP light does not illuminate.
- AT OIL TEMP light remains lit after engine start.
| Step | Check | Yes | No |
|---|---|---|---|
| 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. Refer to SELF-DIAGNOSIS DISPLAY MODE . |
| 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. Refer 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. Refer to SELF-DIAGNOSIS DISPLAY MODE . |
| 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. |
- AWD light circuit is open or shorted.
- Combination meter malfunction
- TCM is in AWD special control mode.
- When the ignition switch is turned to ON, the AWD light does not illuminate.
- AWD light remains lit after engine start.
- AWD light is blinking immediately after engine start.
| Step | Check | Yes | No |
|---|---|---|---|
| 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. Refer to SELF-DIAGNOSIS DISPLAY MODE . |
| 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. Refer 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. Refer 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 the {Rear differential inspection mode} from «AT related learning & inspecting mode», and check. Refer 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. Refer to BASIC DIAGNOSTIC PROCEDURE . | Go to step 8 . |
| 8 CHECK COMBINATION METER. Perform the self-diagnosis of combination meter. Refer to SELF-DIAGNOSIS DISPLAY MODE . | Is there any trouble with the combination meter? | Repair the combination meter. | Check the TCM. |
Defective harness connector
Subaru Select Monitor communication failure
DTC DETECTING CONDITION
- Inhibitor switch is faulty.
- At least 2 range signal is input.
- Shift characteristics are erroneous.
- The range position of the select lever and the position of shift indicator display do not match.
- Inhibitor switch is faulty.
- No range signal is input.
- Shift characteristics are erroneous.
- 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.
- Excessive shift shock
- Shift characteristics malfunction
Input signal circuit of ATF temperature sensor is open or shorted.
- Excessive shift shock
- Shift characteristics malfunction
- Input signal circuit of TCM is open or shorted.
- Turbine speed sensor is faulty.
- Standing start problems
- Shock occurs when engaging the lockup clutch.
- 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.
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.
- Control valve hydraulic circuit malfunction
- Primary UP solenoid, primary Down solenoid characteristics malfunction
- CVT chain slippage
- Acceleration is poor during standing start.
- Shift control malfunction
- Engine speed increases abruptly.
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK TRANSMISSION FLUID. Check the condition of ATF. Refer to CONDITION CHECK . | Is the ATF OK? | Go to step 2 . | Check according to the "corrective action" of ATF (CVTF) "CONDITION CHECK". Refer to CONDITION CHECK . |
| 2 CHECK TRANSMISSION FLUID. Check the amount of ATF. Refer to ADJUSTMENT . | Is the ATF amount correct? | Go to step 3 . | Adjust the amount of ATF. Refer to ADJUSTMENT . |
| 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» 1.5 - 2.6? | Go 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» 0.5 - 0.9? | Go to step 6 . | Replace the transmission assembly. Refer 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". Refer to INSPECTION MODE . | Does the AT OIL TEMP light blink and is DTC P0730 displayed? | Replace the transmission assembly. Refer to AUTOMATIC TRANSMISSION ASSEMBLY . | If there is shift problems, abrupt increase of engine speed, standing start problems, replace the transmission assembly. Refer to AUTOMATIC TRANSMISSION ASSEMBLY . If it is normal, temporary poor contact occurs. |
DIAGNOSTIC PROCEDURE
- Control valve hydraulic circuit malfunction
- Secondary pressure sensor fault or characteristics malfunction
- Acceleration is poor during standing start.
- Shift control malfunction
- Engine speed increases abruptly.
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK TRANSMISSION FLUID. Check the condition of ATF. Refer to CONDITION CHECK . | Is the ATF OK? | Go to step 2 . | Check according to the "corrective action" of ATF (CVTF) "CONDITION CHECK". Refer to CONDITION CHECK . |
| 2 CHECK TRANSMISSION FLUID. Check the amount of ATF. Refer to ADJUSTMENT . | Is the ATF amount correct? | Go to step 3 . | Adjust the amount of ATF. Refer to ADJUSTMENT . |
| 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 3000 rpm. Read the data of «Actual secondary pressure» using Subaru Select Monitor. | Is the «Actual secondary pressure» higher than the value in Step 3? 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 the value in Step 4? 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. Refer 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". Refer to INSPECTION MODE . | Does the AT OIL TEMP light blink and is DTC P0841 displayed? | Perform the secondary pressure test. Refer to SECONDARY PRESSURE (LINE PRESSURE) TEST . | If there is shift problems, abrupt increase of engine speed, standing start problems, replace the transmission assembly. Refer 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
Input signal circuit of secondary pressure sensor is shorted.
Shift characteristics malfunction
- Power supply circuit of TCM is open or shorted.
- Self shut relay malfunction
Gear is not changed.
| CAUTION | After diagnosis, perform Clear Memory Mode for ECM. Refer 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.
- Engine speed increases abruptly, and can not start.
- Engine speed increases abruptly during driving.
- Output signal circuit of secondary solenoid is open or shorted.
- Secondary solenoid has open circuit inside.
- Engine speed increases abruptly, and can not start.
- Engine speed increases abruptly during driving.
- Control valve hydraulic circuit malfunction
- F&R solenoid characteristics malfunction
- Clutch slippage caused by forward clutch facing deterioration
- Clutch slippage caused by hydraulic pressure leaks
- Engine speed increases abruptly, and can not accelerate.
- Excessive slippage is felt.
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK TRANSMISSION FLUID. Check the condition of ATF. Refer to CONDITION CHECK .. | Is the ATF OK? | Go to step 2 . | Check according to the "corrective action" of ATF (CVTF) "CONDITION CHECK". Refer to CONDITION CHECK . |
| 2 CHECK TRANSMISSION FLUID. Check the amount of ATF. Refer to ADJUSTMENT . | Is the ATF amount correct? | Go to step 3 . | Adjust the amount of ATF. Refer to ADJUSTMENT . |
| 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. Refer to STALL TEST . | Is the stall test normal? | Go to step 5 . | If the engine speed increases abruptly, replace the transmission assembly. Refer 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". Refer to INSPECTION MODE . | Does the AT OIL TEMP light blink and is DTC P0965 displayed? | Replace the transmission assembly. Refer to AUTOMATIC TRANSMISSION ASSEMBLY . | If there is abrupt increase of engine speed, standing start problems, replace the transmission assembly. Refer 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
- Output signal circuit of F&R solenoid is open or shorted.
- 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.
- Output signal circuit of AWD solenoid is open or shorted.
- AWD solenoid has open circuit inside.
- Tight corner braking phenomenon occurs.
- Drivability getting worse.
Output signal circuit of primary UP solenoid is shorted.
Gear is not changed. (No up-shift)
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)
Output signal circuit of primary DOWN solenoid is open or shorted.
Gear is not changed. (No down-shift)
- TCM EEPROM malfunction
- EEPROM writing error during self shut control
- AT learning is not finished.
- Shock occurs when selecting N --> D, N --> R.
| Step | Check | Yes | No |
|---|---|---|---|
| 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. Clear the AT learning value. Perform the AT learning. Refer 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 FOR ANY OTHER DTC ON DISPLAY. Perform «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
- Output signal circuit of primary speed sensor is open or shorted.
- Primary speed sensor malfunction
- Standing start problems
- Shock occurs when engaging the lockup clutch.
- Shock occurs when selecting shift position.
- Output signal circuit of secondary speed sensor is open or shorted.
- Secondary speed sensor malfunction
- Shifting shock is felt.
- Acceleration is poor during standing start.
- Shift control malfunction
- Lock up clutch malfunction
- Hydraulic leaks or hydraulic valve stick of lock up system
- No lock-up occurs.
- Engine speed increases abruptly during driving.
| Step | Check | Yes | No |
|---|---|---|---|
| 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. Refer to CONDITION CHECK . | Is the ATF OK? | Go to step 4 . | Check according to the "corrective action" of ATF (CVTF) "CONDITION CHECK". Refer to CONDITION CHECK . |
| 4 CHECK TRANSMISSION FLUID. Check the amount of ATF. Refer to ADJUSTMENT . | Is the ATF amount correct? | Go to step 5 . | Adjust the amount of ATF. Refer to ADJUSTMENT . |
| 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". Refer 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. Refer 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.
Engine stalls.
Output signal circuit of lock up duty solenoid is shorted.
No lock-up occurs.
- Output signal circuit of shift indicator is open or shorted.
- Combination meter malfunction
- Shift indicator does not display or remains displayed.
- Shift indicator display does not change.
| Step | Check | Yes | No |
|---|---|---|---|
| 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 data of «Shift Step in Manual Mode» 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 select lever. Read the data of «Shift Step in Manual Mode» using the Subaru Select Monitor. | Is "2" displayed? | Currently, shift indicator is normal. | Check the TCM. |
DIAGNOSTIC PROCEDURE
INSPECTION
| Symptoms | Faulty 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 set | Select lever TCM |