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Automatic Transmission 4AT (Diagnostics): Overview Subaru Forester SH

Automatic Trans 1 illustration ~499 words

OPERATION OF SELECT LEVER

Make sure there is no noise, dragging or contact pattern in each select lever range.

WARNINGStop the engine while checking the operation of the select lever.

OPERATION

  1. Using the Subaru Select Monitor, select {Each System Check} in the «Main Menu».
  2. On the «System Selection Menu», select {Transmission Control System}.
  3. After transmission type information pops up, select [OK].
  4. On the «Transmission Diagnosis», select {Current Data Display & Save}.
  5. On the «Current Data Display & Save», select {Normal Sampling}.
  6. Move the screen up or down with the scroll keys, and display the data you wish to view.
  1. The support data list is as follows.
ContentsDisplayUnit of measure
Battery voltageBattery VoltageV
Rear vehicle speed sensor signalRear Wheel SpeedKm/h or MPH
Front vehicle speed sensor signalFront Wheel SpeedKm/h or MPH
Engine speed signalEngine SpeedRPM
Automatic transmission fluid temperature signalATF Temp.°C or °F
Gear positionGear Position
Line pressure control duty ratioLine Pressure Duty Ratio%
Lock up clutch control duty ratioLock Up Duty Ratio%
Transfer clutch control duty ratioTransfer Duty Ratio%
Torque converter turbine speed signalTurbine Revolution SpeedRPM
2 - 4 brake timing pressure control duty ratioBrake Clutch Duty Ratio%
Low clutch duty ratioLow Clutch Duty%
High clutch duty ratioHigh Clutch Duty%
Low & reverse brake duty ratioL&R B Duty%
Accelerator positionAccel. Opening Angle%
FWD switch signalFWD SwitchON or OFF
Stop light switch signalStop Light SwitchON or OFF
Anti lock brake system signalABS SignalON or OFF
Parking range signalP RangeON or OFF
Neutral range signalN RangeON or OFF
Reverse range signalR Range SignalON or OFF
Drive range signalD Range SignalON or OFF
AT diagnosis light output signalDiagnosis LampON or OFF
ATF Temperature LightATF Temperature LampON or OFF
Up shift signalUp SwitchON or OFF
Down shift signalDown SwitchON or OFF
Sport shift signalTiptronic Mode SwitchON or OFF
Cruise control signalCruise Control SignalON or OFF

SUPPORT DATA

Note. For details concerning the operation procedure, refer to the PC application help for Subaru Select Monitor.

  1. Using the Subaru Select Monitor, select {Each System Check} in the «Main Menu».
  2. On the «Each System Check Menu» screen, select {Transmission Control System}.
  3. After transmission type information is displayed, select [OK].
  4. On the «Transmission Diagnosis», select {Diagnostic Code(s) Display}.
  5. On the «DTC Display» screen, select {Temporary Diagnostic Code(s)} or {Memorized Diagnostic Code(s)}.

Note. For details concerning the work procedure, refer to the PC application help for Subaru Select Monitor. For details concerning DTC, refer to List of Diagnostic Trouble Code (DTC). Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .

  1. Move the select lever to "P" range.
  2. Using the Subaru Select Monitor, select {Each System Check} in the «Main Menu».
  3. On the «Each System Check Menu» screen, select {Transmission Control System}.
  4. After transmission type information is displayed, select [OK].
  5. On the «Transmission Diagnosis», select {Clear Memory}.
  6. When "Done. Turn ignition switch OFF" is displayed, select [OK].
  7. Turn the ignition switch to OFF. When turning the ignition switch to ON again, wait for 10 seconds or more.
  8. Turn the Subaru Select Monitor OFF.

Note. If {Clear Memories 2} is executed, DTCs and learned control memory are cleared. If {Clear Memories 2} is executed, perform learning. Refer to LEARNING CONTROL .

GENERAL DESCRIPTION

  1. After performing the following services, perform the transmission learning operation. Replacement of TCM/Replacement or disassembly of transmission assembly/Replacement of control valve body/Performing "Clear Memories 2".
  2. Perform the procedures according to the message displayed on the Subaru Select Monitor.

If there is a malfunction with an on-board diagnosis part, the ATF temperature warning light will flash. The flashing will continue from when the malfunction is confirmed after starting the engine, until the ignition switch is turned to OFF. The malfunctioning part or unit can be identified by DTC during the on-board diagnostics operation. Problems which occurred previously can also be identified through the memory function. If the ATF temperature warning light does not show a problem (although a problem is occurring), the problem can be determined by checking the performance characteristics of each sensor using the Subaru Select Monitor. The ATF warning light signal patterns are shown in the figure.

Scheme 57

Scheme 57: OPERATION
Scheme 57: OPERATION

If the ATF temperature warning light does not function properly, check the ATF temperature warning light circuit. Refer to INSPECTION , AT Oil Temp Warning Light Display.

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