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Continuously Variable Transaxle (Cvt) (Diagnostics): Other Subaru Legacy BM/BR рестайлинг

Automatic Trans 9 illustrations ~611 words

PROCEDURE

StepCheckYesNo
1 CHECK PRE-INSPECTION. Ask the customer when and how the trouble occurred using the interview check list. Refer to CHECK LIST FOR INTERVIEW . Before performing diagnostics, check the following items which might affect CVT problems. General inspection Refer to INSPECTION . Disconnection of harness connector Visual check for harness damage Oil leakage Stall speed test Refer to STALL TEST . Secondary pressure test Refer to SECONDARY PRESSURE (LINE PRESSURE) TEST . Transfer clutch pressure test Refer to TRANSFER CLUTCH PRESSURE TEST . Time lag test Refer to TIME LAG TEST . Road test Refer to ROAD TEST . Inhibitor switch Refer to INHIBITOR SWITCH .Is the item that is thought to influence the CVT problem working properly?Go to step 2 .Repair the items which may be affecting the CVT trouble.
2 CHECK AT OIL TEMP LIGHT. Turn the ignition switch to ON and wait for at least 2 seconds.Does the AT OIL TEMP light illuminate?Go to step 3 .Check the AT OIL TEMP light.
3 CHECK AT OIL TEMP LIGHT. Start the engine and wait for 2 seconds or more.Does the AT OIL TEMP light blink?Go to step 4 .Go to step 6 .
4 CHECK FOR ANY OTHER DTC ON DISPLAY. Read the DTC. NOTE: If the communication function of Subaru Select Monitor cannot be executed normally, check the communication circuit. Refer to COMMUNICATION FOR INITIALIZING IMPOSSIBLE .Is DTC displayed on Subaru Select Monitor?Record all DTC. Go to step 5 .Go to step 6 .
5 CHECK FREEZE FRAME DATA. Using the Subaru Select Monitor, check the Freeze Frame Data.Are freeze frame data recorded?Record the freeze frame data. Go to step 7 .Go to step 7 .
6 PERFORM GENERAL DIAGNOSTICS. Inspect using "Diagnostic Procedure without Diagnostic Trouble Code (DTC)". Refer to DIAGNOSTIC PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC) . Inspect using "Diagnostics with Phenomenon". Refer to DIAGNOSTICS WITH PHENOMENON . Perform the Inspection Mode. Refer to INSPECTION MODE . Read the DTC.Is DTC displayed on Subaru Select Monitor?Go to step 7 .Finish the diagnosis.
7 PERFORM DIAGNOSIS. Inspect by referring to "Diagnostic Procedure with Diagnostic Trouble Code (DTC)". Refer to DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) . NOTE: For the DTC table, refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . Repair the trouble cause. Perform the Clear Memory Mode. Perform the Inspection Mode. Refer to INSPECTION MODE . Read the DTC.Is DTC displayed on Subaru Select Monitor?Inspect by referring to "Diagnostic Procedure with Diagnostic Trouble Code (DTC)". Refer to DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) .Finish the diagnosis.
NOTE
If the communication function of Subaru Select Monitor cannot be executed normally, check the communication circuit. Refer to COMMUNICATION FOR INITIALIZING IMPOSSIBLE .
NOTE
For the DTC table, refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .

CHECK

Check the following items when a problem has occurred.

Note. Use copies of this page for interviewing customers.

Scheme 626

Scheme 626: CHECK

SUPPLEMENTAL RESTRAINT SYSTEM "AIRBAG"

The airbag system wiring harness is routed near the TCM.

CAUTIONAll the airbag system wiring harnesses and connectors are colored yellow. Do not use an electric test equipment to check these circuits. Be careful not to damage the airbag system wiring harness when performing diagnostics or servicing the TCM.

MEASUREMENT

When measuring the voltage and resistance of the ECM, TCM or each sensor, use a tapered pin with a diameter of less than 0.64 mm (0.025 in) in order to avoid poor contact. Do not insert a pin of more than 0.65 mm (0.026 in) diameter.

BATTERY

Measure the battery voltage and specific gravity of the electrolyte.

Standard voltage: 12 V or more

Specific gravity: 1.260 or more

TRANSMISSION GROUND

Make sure that the ground terminal bolt is tightened securely.

Tightening torque

14 N.m (1.4 kgf-m, 10.3 ft-lb)

Scheme 627

Scheme 627: TRANSMISSION GROUND

GENERAL TOOL

TOOL NAMEREMARKS
Circuit testerUsed for measuring resistance, voltage and current.
OscilloscopeUsed for measuring the sensor.

Scheme 628

Scheme 628: CONTROL MODULE

Scheme 629

Scheme 629

Scheme 630

Scheme 630: SENSOR

Scheme 631

Scheme 631: SOLENOID

Scheme 632

Scheme 632: ELECTRICAL SPECIFICATION

Note. Measure after warming up.

ItemConnector No.Terminal No.Measuring conditionMeasurement valueResistance between terminal and chassis groundRemarks
Backup power supplyB55110 - 13 V
Ignition power supplyB552110 - 13 V
Main power supplyB551110 - 13 V
Main power supplyB55210 - 13 V
Main power supplyB552210 - 13 V
Manual mode switchB554Manual mode switch ONLess than 1 V
Manual mode switch OFF8 V or more
Manual mode UP switchB555Manual mode UP switch ONLess than 1 V
Manual mode UP switch OFF8 V or more
Manual mode DOWN switchB5516Manual mode DOWN switch ONLess than 1 V
Manual mode DOWN switch OFF8 V or more
Stop light switchB5513Stop light switch ON8 V or more
Stop light switch OFFLess than 1 V
P range switchB545P rangeLess than 1 V
Except for P range8 V or more
R range switchB5418R rangeLess than 1 V
Except for R range8 V or more
N range switchB549N rangeLess than 1 V
Except for N range8 V or more
D range switchB5422D rangeLess than 1 V
Except for D range8 V or more
ATF temperature sensorB543ATF temperature at 20°C (68°F)Approx. 2.5 VApprox. 2.5 kohms
ATF temperature at 80°C (176°F)Approx. 0.7 VApprox. 330 ohms
ATF temperature sensor GNDB5416AlwaysApprox. 0 V
Secondary pressure sensor power supply outputB542Ignition switch ON5 V
Secondary pressure sensorB5417Ignition switch ON, engine OFFApprox. 0.5 V (0 MPa)Value increases with increase of engine load. (0.5 - 4.5 V)
Ignition switch ON, engine ONApprox. 1.0 V (1.0 MPa)
Secondary pressure sensor GNDB5415AlwaysApprox. 0 V
Primary speed sensorB546While driving0 or 5 V(Scheme 633)the waveform (sensor)
Secondary speed sensorB547While driving0 or 5 V(Scheme 633)the waveform (sensor)
Turbine speed sensorB5420Engine ON, "P" or "N" range0 or 5 V(Scheme 633)the waveform (sensor)
Self shut outputB5520For three seconds after ignition switch ON and OFFLess than 1 V
Ignition switch OFF8 V or more
F&R solenoidB5411Engine ON(Scheme 634)the waveform (solenoid (1))Approx. 4 - 6 ohmsResistance value at 20°C (68°F). Value is higher as the temperature increase.
Secondary solenoidB5412Engine ON(Scheme 634)the waveform (solenoid (2))Approx. 5 - 7 ohmsResistance value at 20°C (68°F). Value is higher as the temperature increase.
Primary UP solenoidB5424Engine ON, while UP shifting(Scheme 634)the waveform (solenoid (3))Approx. 10 - 13.5 ohmsResistance value at 20°C (68°F). Value is higher as the temperature increase.
Primary DOWN solenoidB5425Engine ON, while DOWN shifting(Scheme 634)the waveform (solenoid (4))Approx. 10 - 13.5 ohmsResistance value at 20°C (68°F). Value is higher as the temperature increase.
Lock-up duty solenoidB5426Lock-up ON(Scheme 634)the waveform (solenoid (5))Approx. 10 - 13.5 ohmsResistance value at 20°C (68°F). Value is higher as the temperature increase.
AWD solenoidB5413Engine ON, "P" or "N" range(Scheme 634)the waveform (solenoid (6))Approx. 2 - 4.5 ohmsResistance value at 20°C (68°F). Value is higher as the temperature increase.
Engine ON, "D" range, brake ON(Scheme 634)the waveform (solenoid (7))
CAN communication line (+)B5518
CAN communication line (-)B5517
GNDB541AlwaysApprox. 0 V
GNDB5414AlwaysApprox. 0 V

Scheme 633

Scheme 633: SENSOR

Scheme 634

Scheme 634: SOLENOID

HOW TO USE SUBARU SELECT MONITOR

For detailed operation procedures, refer to "PC application help for Subaru Select Monitor".

READ CURRENT DATA

For detailed operation procedures, refer to "PC application help for Subaru Select Monitor".

ItemDisplayUnit of measure
Engine speed signalEngine SpeedRpm
Battery voltageECU ACCV
Accelerator position sensorAccel. Opening Angle%
Vehicle speed converted from secondary speed sensor signalFront Wheel SpeedKm/h or MPH
Lock-up duty solenoid set duty ratioLock Up Duty Ratio%
AWD solenoid set duty ratioTransfer Duty Ratio%
Turbine speed sensor signalTurbine Revolution SpeedRpm
ATF temperature sensor signalATF Temp.°C or °F
Secondary speed sensor signalSecondary Rev SpeedRpm
Secondary fluid pressure sensor signalActual Secondary PressureMPa
Secondary solenoid indicator currentSecondary Set CurrentMA
Secondary solenoid actual currentSecondary Actual CurrentMA
Gear ratioActual Gear Ratio
Shift step in manual modeShift Step in Manual Mode
Primary UP solenoid set duty ratioPrimary UP Duty%
Primary DOWN solenoid set duty ratioPrimary DOWN Duty%
F&R solenoid indicator currentF&R Linear Solenoid Set CurrentMA
F&R solenoid actual currentF&R Linear Solenoid Actual CurrentMA
Primary speed sensor signalPrimary Rev SpeedRpm
Manual mode switch signalTiptronic Mode SwitchON or OFF
Manual mode down switch signalDown SwitchON or OFF
Stop light switch signalStop Light SwitchON or OFF
Manual mode up switch signalUp SwitchON or OFF
Drive range signalD Range SignalON or OFF
Reverse range signalR Range SignalON or OFF
AT OIL TEMP light 2 Hz blink conditionDiagnosis LampON or OFF
AT OIL TEMP light ON conditionATF Temperature LampON or OFF
Parking range signalP RangeON or OFF
Neutral range signalN RangeON or OFF
Secondary fluid pressure A/D converted valueSecondary pressure sensor voltage.V
ATF temperature sensor voltageATF Temp sensor voltage.V
AT learning mode conditionAT learningCompleted or Not Completed

READ FREEZE FRAME DATA

For detailed operation procedures, refer to "PC application help for Subaru Select Monitor".

ItemDisplayUnit of measure
Relative time since detectionRelative time since detectionMs
Engine speed signalEngine SpeedRpm
Battery voltageECU ACCV
Accelerator position sensorAccel. Opening Angle%
Vehicle speed converted from secondary speed sensor signalFront Wheel SpeedKm/h or MPH
Lock-up duty solenoid set duty ratioLock Up Duty Ratio%
AWD solenoid set duty ratioTransfer Duty Ratio%
Turbine speed sensor signalTurbine Revolution SpeedRpm
ATF temperature sensor signalATF Temp.°C or °F
Secondary speed sensor signalSecondary Rev SpeedRpm
Secondary fluid pressure sensor signalActual Secondary PressureMPa
Secondary solenoid indicator currentSecondary Set CurrentMA
Secondary solenoid actual currentSecondary Actual CurrentMA
Gear ratioActual Gear Ratio
Shift step in manual modeShift Step in Manual Mode
Primary UP solenoid set duty ratioPrimary UP Duty%
Primary DOWN solenoid set duty ratioPrimary DOWN Duty%
F&R solenoid indicator currentF&R Linear Solenoid Set CurrentMA
F&R solenoid actual currentF&R Linear Solenoid Actual CurrentMA
Primary speed sensor signalPrimary Rev SpeedRpm
Manual mode switch signalTiptronic Mode SwitchON or OFF
Manual mode down switch signalDown SwitchON or OFF
Stop light switch signalStop Light SwitchON or OFF
Manual mode up switch signalUp SwitchON or OFF
Drive range signalD Range SignalON or OFF
Reverse range signalR Range SignalON or OFF
AT OIL TEMP light 2 Hz blink conditionDiagnosis LampON or OFF
AT OIL TEMP light ON conditionATF Temperature LampON or OFF
Parking range signalP RangeON or OFF
Neutral range signalN RangeON or OFF
Secondary fluid pressure A/D converted valueSecondary pressure sensor voltage.V
ATF temperature sensor voltageATF Temp sensor voltage.V

Refer to ROAD TEST .

PREPARATION FOR LEARNING

  1. Warm up or cool down until the ATF temperature displayed on the Subaru Select Monitor is 40 - 65°C (104 - 149°F).
  2. After stopping the vehicle, shift the select lever to "P" range.
  3. Apply the electronic parking brake.
  4. Lift up the vehicle. CAUTION: While working, be sure to keep the lower edge of the tires 30 cm or more above the ground as vehicle will vibrate.
  5. Connect the Subaru Select Monitor to data link connector.
  6. Turn the ignition switch to ON.
  7. Turn off all switches causing an electrical load, such as headlights, A/C, seat heater and rear defogger, etc.

SIMPLE LEARNING

Note. Simple learning is performed with the vehicle lifted, without actually running the vehicle.

CAUTIONDo not turn the power of the Subaru Select Monitor OFF during work, and do not disconnect the data link connector.
  1. Select {Work Support} in the «Transmission Diagnosis» display screen of the Subaru Select Monitor.
  2. Select {Compulsory learning mode} in the «Work Support» display screen of the Subaru Select Monitor.
  3. Follow the messages displayed on the Subaru Select Monitor screen when working. NOTE: During AT learning in progress, AT OIL TEMP light in the combination meter starts flashing at 2 Hz and the learning operation starts. The following message is displayed on the screen when the AT OIL TEMP light which was flashing at 2 Hz turns off.
  4. When «AT learning normally ended.» is displayed, simple AT learning is completed. NOTE: If communication error occurs during learning, retry the "AT learning mode" from the beginning. If the message «Execute AT learning again after fixing troubles of the vehicle» appears during learning, select [OK] and display the DTC list. After repairing the locations indicated by the DTC, start the "AT learning mode" over from the beginning. When communication error occurs during learning, select lever does not shift occasionally. If select lever does not shift, turn the ignition switch to OFF before operating the select lever. If the message «AT learning ended abnormally.» is displayed, start the "AT learning mode" over from the beginning. Message Main causes for abnormal termination «AT learning ended abnormally.» Fault is detected during AT learning. The accelerator pedal is depressed during AT learning. An unspecified operation was performed during AT learning ATF temperature becomes out of specification during AT learning. Battery voltage is low. Malfunction indicator light illuminates. Electric parking brake not applied strongly enough Brake pedal is not fully depressed. Abnormal idle speed increase, etc. For detailed operation procedures, refer to "PC application help for Subaru Select Monitor".

LIST

DTCItemContent of diagnosisReference
P0705Transmission Range Sensor Circuit (PRNDL Input)Inhibitor switch malfunction or short circuitRefer to DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT (PRNDL INPUT) .
P0708AT Range Switch Not InputtedInhibitor switch malfunction or open circuitRefer to DTC P0708 AT RANGE SWITCH NOT INPUTTED .
P0712Transmission Fluid Temperature Sensor Circuit Low InputATF temperature sensor is faulty or input signal circuit is shorted.Refer to DTC P0712 TRANSMISSION FLUID TEMPERATURE SENSOR CIRCUIT LOW INPUT .
P0713Transmission Fluid Temperature Sensor Circuit High InputATF temperature sensor is faulty or input signal circuit is open or shorted.Refer to DTC P0713 TRANSMISSION FLUID TEMPERATURE SENSOR CIRCUIT HIGH INPUT .
P0716Torque Converter Turbine SpeedTurbine speed sensor is faulty or input signal circuit is open or shorted.Refer to DTC P0716 TORQUE CONVERTER TURBINE SPEED .
P0719Brake Switch Circuit LowBrake switch is faulty or input signal circuit is open or shorted.Refer to DTC P0719 BRAKE SWITCH CIRCUIT LOW .
P0724Brake Switch Circuit HighBrake switch is faulty or input signal circuit is shorted.Refer to DTC P0724 BRAKE SWITCH CIRCUIT HIGH .
P0730Gearshift Control Performance AbnormalPrimary speed sensor, secondary speed sensor, control valve, or chain is faulty.Refer to DTC P0730 GEARSHIFT CONTROL PERFORMANCE ABNORMAL .
P0801Reverse Inhibit Control CircuitShift lock solenoid is faulty or output signal circuit is open or shorted.Refer to DTC P0801 REVERSE INHIBIT CONTROL CIRCUIT .
P0841Secondary Oil Pressure Sensor PerformanceSecondary pressure sensor or control valve is faultyRefer to DTC P0841 SECONDARY OIL PRESSURE SENSOR PERFORMANCE .
P0842Secondary Oil Pressure Sensor Circuit (Low)Secondary pressure sensor is faulty or input signal circuit is open or shorted.Refer to DTC P0842 SECONDARY OIL PRESSURE SENSOR CIRCUIT (LOW) .
P0843Secondary Oil Pressure Sensor Circuit (High)Secondary pressure sensor is faulty or input signal circuit is shorted.Refer to DTC P0843 SECONDARY OIL PRESSURE SENSOR CIRCUIT (HIGH) .
P0890AT Self-Shut Relay Diagnosis (Low)Self-shut relay is faulty or input signal circuit is open or shorted.Refer to DTC P0890 AT SELF-SHUT RELAY DIAGNOSIS (LOW) .
P0951Manual SwitchManual mode switch is faulty or input signal circuit is open or shorted.Refer to DTC P0951 MANUAL SWITCH .
P0962Secondary Solenoid Circuit (Low)Secondary solenoid is faulty or output signal circuit is shorted.Refer to DTC P0962 SECONDARY SOLENOID CIRCUIT (LOW) .
P0963Secondary Solenoid Circuit (High)Secondary solenoid is faulty or output signal circuit is open or shorted.Refer to DTC P0963 SECONDARY SOLENOID CIRCUIT (HIGH) .
P0965Forward & Reverse Solenoid FunctionF&R solenoid, forward clutch or control valve is faulty.Refer to DTC P0965 FORWARD & REVERSE SOLENOID FUNCTION .
P0966Forward & Reverse Solenoid Circuit (Low)F&R solenoid is faulty or output signal circuit is shorted.Refer to DTC P0966 FORWARD & REVERSE SOLENOID CIRCUIT (LOW) .
P0967Forward & Reverse Linear Solenoid Circuit (High)F&R solenoid is faulty or output signal circuit is open or shorted.Refer to DTC P0967 FORWARD & REVERSE LINEAR SOLENOID CIRCUIT (HIGH) .
P0970Transfer Solenoid Circuit (Low)AWD solenoid is faulty or output signal circuit is shorted.Refer to DTC P0970 TRANSFER SOLENOID CIRCUIT (LOW) .
P0971Transfer Solenoid Circuit (High)AWD solenoid is faulty or output signal circuit is open or shorted.Refer to DTC P0971 TRANSFER SOLENOID CIRCUIT (HIGH) .
P0973Primary Solenoid System A Circuit (Low)Primary UP solenoid is faulty or output signal circuit is shorted.Refer to DTC P0973 PRIMARY SOLENOID SYSTEM A CIRCUIT (LOW) .
P0974Primary Solenoid System A Circuit (High)Primary UP solenoid is faulty or output signal circuit is open or shorted.Refer to DTC P0974 PRIMARY SOLENOID SYSTEM A CIRCUIT (HIGH) .
P0976Primary Solenoid System B Circuit (Low)Primary DOWN solenoid is faulty or output signal circuit is shorted.Refer to DTC P0976 PRIMARY SOLENOID SYSTEM B CIRCUIT (LOW) .
P0977Primary Solenoid System B Circuit (High)Primary DOWN solenoid is faulty or output signal circuit is open or shorted.Refer to DTC P0977 PRIMARY SOLENOID SYSTEM B CIRCUIT (HIGH) .
P1724AT EEPROM ErrorTCM EEPROM malfunctionRefer to DTC P1724 AT EEPROM ERROR .
P2746Primary Pulley Revolution Speed Sensor CircuitPrimary speed sensor is faulty or input signal circuit is open or shorted.Refer to DTC P2746 PRIMARY PULLEY REVOLUTION SPEED SENSOR CIRCUIT .
P2750Sec. Pulley Revolution Speed Sensor CircuitSecondary speed sensor is faulty or input signal circuit is open or shorted.Refer to DTC P2750 SEC. PULLEY REVOLUTION SPEED SENSOR CIRCUIT .
P2762Lock-Up Duty Solenoid MalfunctionLock-up duty solenoid, lock-up clutch or control valve is faultyRefer to DTC P2762 LOCK-UP DUTY SOLENOID MALFUNCTION .
P2763Lock-Up Duty Solenoid Circuit (High)Lock-up duty solenoid is faulty or output signal circuit is open or shorted.Refer to DTC P2763 LOCK-UP DUTY SOLENOID CIRCUIT (HIGH) .
P2764Lock-Up Duty Solenoid Circuit (Low)Lock-up duty solenoid is faulty or output signal circuit is shorted.Refer to DTC P2764 LOCK-UP DUTY SOLENOID CIRCUIT (LOW) .
U0073Control Module Communication Bus "A" OffCAN bus is shorted or communication error.Refer to DTC U0073 CONTROL MODULE COMMUNICATION BUS "A" OFF .
U0100Lost Communication With ECM/PCM "A"Detected that the engine data has not yet arrived.Refer to DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A" .
U0122Lost Communication With Vehicle Dynamics Control ModuleDetected that the VDC data has not yet arrived.Refer to DTC U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE .
U0140Lost Communication With Body Control ModuleDetected that the body integrated unit data has not yet arrived.Refer to DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE .
U0155Lost Communication With Instrument Panel Cluster (IPC) Control ModuleDetected that the meter data has not yet arrived.Refer to DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE .
U0401Invalid Data Received From ECM/PCM "A"Detected abnormality of the engine data.Refer to DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" .
U0416Invalid Data Received From Vehicle Dynamics Control ModuleDetected abnormality of the VDC data.Refer to DTC U0416 INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE .
U0422Invalid Data Received From Body Control ModuleDetected abnormality of the body integrated unit data.Refer to DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE .
U0423Invalid Data Received From Instrument Panel Cluster Control ModuleDetected abnormality of the meter data.Refer to DTC U0423 INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE . DTC Item Content of diagnosis Reference