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Diagnosis Using SUBARU Select Monitor

NOTE: When performing test procedures where vehicle must be raised and secured with a safety stand, all wheels must be off ground. Speed difference between front and rear wheels during the following procedure may cause ABS indicator to illuminate, but this does not indicate a malfunction. When A/T diagnosis is complete, perform ABS memory clearance procedure.

You should be directed here if an automatic transaxle problem occurs and no DTCs are present. Use Subaru Select Monitor and perform the following system tests in order:

  1. Battery Voltage

    Turn ignition switch to OFF position. Connect Subaru Select Monitor to DLC. Start engine and warm to normal operating temperature. Engine coolant must reach 176°F (80°C). Allow engine to idle. Using Subaru Select Monitor, monitor data of battery voltage applied to TCM. If voltage is 10-16 volts, go to next step. If voltage is not 10-16 volts, check battery voltage, battery electrolyte level and regulating voltage under no loads and generator. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.

  2. Vehicle Speed Sensor No. 1

    Raise vehicle on hoist and secure with safety stands. Using Subaru Select Monitor, monitor data of vehicle speed sensor No. 1 (MPH). Compare speedometer reading with Subaru Select Monitor reading. If speedometer reading increases with Subaru Select Monitor reading, go to next step. If speedometer reading does not increase with Subaru Select Monitor reading, perform vehicle speed sensor No. 1 and circuit diagnostics. Go to DTC 93/P0500: VEHICLE SPEED SENSOR NO. 1  under DIAGNOSTIC TESTS.

  3. Vehicle Speed Sensor No. 2

    Using Subaru Select Monitor, monitor data of vehicle speed sensor No. 2 (MPH). Compare speedometer reading with Subaru Select Monitor reading. If speedometer reading increases with Subaru Select Monitor reading, go to next step. If speedometer reading does not increase with Subaru Select Monitor reading, perform vehicle speed sensor No. 2 and circuit diagnostics. Go to DTC 33/P0720: VEHICLE SPEED SENSOR NO. 2  under DIAGNOSTIC TESTS.

  4. Engine Speed Signal

    Turn A/C switch to OFF position. Start engine and warm to normal operating temperature. Engine coolant must reach 176°F (80°C). Using Subaru Select Monitor, monitor data of engine speed (RPM). If tachometer reading increases with Subaru Select Monitor reading, go to next step. If tachometer reading does not increase with Subaru Select Monitor reading, perform engine speed signal circuit diagnostics. Go to DTC 11/P0725: ENGINE SPEED SIGNAL  under DIAGNOSTIC TESTS.

  5. ATF Temperature Sensor

    Check operation of ATF OIL TEMP indicator. If ATF OIL TEMP indicator stays illuminated 2 seconds after engine is started, go to next step. If ATF OIL TEMP indicator does not remain illuminated 2 seconds after engine is started, perform ATF temperature sensor and circuit diagnostics. Go to DTC 27/P0710: ATF TEMPERATURE SENSOR  under DIAGNOSTIC TESTS. If ATF sensor and circuit are okay, perform combination meter AT OIL TEMP indicator and circuit diagnostics. Go to AT OIL TEMP INDICATOR  under CIRCUIT TESTS.
  6. Start engine and warm transaxle to normal operating temperature. ATF must reach 176°F (80°C). Using Subaru Select Monitor, monitor data of ATF temperature. Turn ignition switch to OFF position, then back to ON position (engine off). If ATF temperature changes from 176°F (80°C), go to next step. If ATF temperature does not change from 176°F (80°C), perform ATF temperature sensor and circuit diagnostics. Go to DTC 27/P0710: ATF TEMPERATURE SENSOR  under DIAGNOSTIC TESTS.

  7. Throttle Position Sensor

    Using Subaru Select Monitor, monitor data of throttle position sensor input signal with throttle fully closed. If voltage is .3-.7 volt, go to next step. If voltage is not .3-.7 volt, perform throttle position sensor and circuit diagnostics. Go to DTC 31/P1700: THROTTLE POSITION SENSOR  under DIAGNOSTIC TESTS.
  8. Using Subaru Select Monitor, monitor data of throttle position sensor input signal with throttle fully open. If voltage is 4.4-4.8 volts, go to next step. If voltage is not 4.4-4.8 volts, perform throttle position sensor and circuit diagnostics. Go to DTC 31/P1700: THROTTLE POSITION SENSOR  under DIAGNOSTIC TESTS.
  9. Using Subaru Select Monitor, monitor data of throttle position sensor input signal. Slowly allow throttle to move to fully closed position from the fully open position. If voltage decreases smoothly, go to next step. If voltage does not decrease smoothly, perform throttle position sensor and circuit diagnostics. Go to DTC 31/P1700: THROTTLE POSITION SENSOR  under DIAGNOSTIC TESTS.

  10. Gear Position

    Raise vehicle on hoist and secure with safety stands. Start engine. Place selector lever in "D" position and slowly increase vehicle speed so that transaxle shifts through all forward gears. Using Subaru Select Monitor, monitor data of gear position. If actual transaxle gear corresponds with gear displayed on Subaru Select Monitor, go to next step. If actual transaxle gear does not correspond with gear displayed on Subaru Select Monitor, perform shift solenoid No. 1 and shift solenoid No. 2 circuit diagnostics. Go to DTC 71/P0753: SHIFT SOLENOID NO. 1  and/or DTC 72/P0758: SHIFT SOLENOID NO. 2  under DIAGNOSTIC TESTS.

  11. Line Pressure Duty Solenoid

    Start engine and warm transaxle to normal operating temperature. ATF must reach 176°F (80°C). Turn ignition switch to OFF position, then to ON position (engine off). Place selector lever in "N" position. Using Subaru Select Monitor, monitor data of line pressure duty solenoid with throttle fully closed. If Subaru Select Monitor reading is 100 percent, go to next step. If Subaru Select Monitor reading is not 100 percent, go to step  14 .
  12. Using Subaru Select Monitor, monitor data of line pressure duty solenoid with throttle fully open. If Subaru Select Monitor reading is 10-20 percent, go to next step. If Subaru Select Monitor reading is not 10-20 percent, go to step  14 .
  13. Using Subaru Select Monitor, monitor data of line pressure duty solenoid. Slowly allow throttle to move to fully closed position from the fully open position. If Subaru Select Monitor reading changes smoothly, go to step  18 . If Subaru Select Monitor reading does not change smoothly, go to next step.
  14. Perform throttle position sensor circuit check. Go to step  7 . If throttle position sensor and circuit are okay, go to next step. If throttle position sensor or circuit is not okay, perform throttle position sensor and circuit diagnostics. Go to DTC 31/P1700: THROTTLE POSITION SENSOR  under DIAGNOSTIC TESTS.
  15. Perform engine speed signal circuit check. Go to step  4 . If engine speed signal circuit is okay, go to next step. If engine speed signal circuit is not okay, perform engine speed signal circuit diagnostics. Go to DTC 11/P0725: ENGINE SPEED SIGNAL  under DIAGNOSTIC TESTS.
  16. Perform ATF temperature sensor circuit check. Go to step  5 . If ATF temperature sensor and circuit are okay, go to next step. If ATF temperature sensor or circuit are not okay, perform ATF temperature sensor and circuit diagnostics. Go to DTC 27/P0710: ATF TEMPERATURE SENSOR  under DIAGNOSTIC TESTS.
  17. Turn ignition switch to ON position. Ensure Subaru Select Monitor is on. Using Subaru Select Monitor, read inhibitor switch data. LED should illuminate on Subaru Select Monitor when each gear range is selected. If LED illuminates properly with each gear range, go to next step. If LED does not illuminate properly, check inhibitor switch. See INHIBITOR SWITCH TEST  under CIRCUIT TESTS.

  18. Lock-Up Duty Solenoid

    Ensure ignition switch is in ON position. With Subaru Select Monitor on, monitor data of lock-up duty solenoid. If Subaru Select Monitor reading is 5 percent, go to next step. If Subaru Select Monitor reading is not 5 percent, go to step  20 .
  19. Raise vehicle on hoist and secure with safety stands. Start engine. Place selector lever in "D" position and slowly increase vehicle speed to 47 MPH. If Subaru Select Monitor reading is 95 percent, go to step  25 . If Subaru Select Monitor reading is not 95 percent, go to next step.
  20. Perform throttle position sensor circuit check. Go to step  7 . If throttle position sensor and circuit are okay, go to next step. If throttle position sensor or circuit is not okay, perform throttle position sensor and circuit diagnostics. Go to DTC 31/P1700: THROTTLE POSITION SENSOR  under DIAGNOSTIC TESTS.
  21. Perform vehicle speed sensor No. 1 circuit check. Go to step  2 . If vehicle speed sensor No. 1 and circuit are okay, go to next step. If vehicle speed sensor No. 1 or circuit is not okay, perform vehicle speed sensor No. 1 and circuit diagnostics. Go to DTC 93/P0500: VEHICLE SPEED SENSOR NO. 1  under DIAGNOSTIC TESTS.
  22. Perform vehicle speed sensor No. 2 circuit check. Go to step  3 . If vehicle speed sensor No. 2 and circuit are okay, go to next step. If vehicle speed sensor No. 2 or circuit is not okay, perform vehicle speed sensor No. 2 and circuit diagnostics. Go to DTC 33/P0720: VEHICLE SPEED SENSOR NO. 2  under DIAGNOSTIC TESTS.
  23. Perform engine speed signal circuit check. Go to step  4 . If engine speed signal circuit is okay, go to next step. If engine speed signal circuit is not okay, perform engine speed signal circuit diagnostics. Go to DTC 11/P0725: ENGINE SPEED SIGNAL  under DIAGNOSTIC TESTS.
  24. Turn ignition switch to ON position. Ensure Subaru Select Monitor is on. Using Subaru Select Monitor, read inhibitor switch data. LED should illuminate on Subaru Select Monitor when each gear range is selected. If LED illuminates properly with each gear range, go to next step. If LED does not illuminate properly, check inhibitor switch. See INHIBITOR SWITCH TEST  under CIRCUIT TESTS.

  25. Transfer Duty Solenoid

    Turn ignition switch to ON position. Place selector lever in "D" position. Using Subaru Select Monitor, monitor data of transfer duty solenoid. Slowly open throttle to fully open position and back to fully closed position. If Subaru Select Monitor reading changes smoothly with throttle position, go to next step. If Subaru Select Monitor reading does not change smoothly with throttle position, go to step  27 .
  26. Turn ignition switch to OFF position. Set FWD mode. Turn ignition switch to ON position. If Subaru Select Monitor reading is 95 percent, perform throttle position sensor power supply check. Go to step  33 . If Subaru Select Monitor reading is not 95 percent, go to next step.
  27. Perform throttle position sensor circuit check. Go to step  7 . If throttle position sensor and circuit are okay, go to next step. If throttle position sensor or circuit is not okay, perform throttle position sensor and circuit diagnostics. Go to DTC 31/P1700: THROTTLE POSITION SENSOR  under DIAGNOSTIC TESTS.
  28. Perform vehicle speed sensor No. 1 circuit check. Go to step  2 . If vehicle speed sensor No. 1 and circuit are okay, go to next step. If vehicle speed sensor No. 1 or circuit is not okay, perform vehicle speed sensor No. 1 and circuit diagnostics. Go to DTC 93/P0500: VEHICLE SPEED SENSOR NO. 1  under DIAGNOSTIC TESTS.
  29. Perform vehicle speed sensor No. 2 circuit check. Go to step  3 . If vehicle speed sensor No. 2 and circuit are okay, go to next step. If vehicle speed sensor No. 2 or circuit is not okay, perform vehicle speed sensor No. 2 and circuit diagnostics. Go to DTC 33/P0720: VEHICLE SPEED SENSOR NO. 2  under DIAGNOSTIC TESTS.
  30. Perform ATF temperature sensor circuit check. Go to step  5 . If ATF temperature sensor and circuit are okay, go to next step. If throttle position sensor or circuit are not okay, perform ATF temperature sensor and circuit diagnostics. Go to DTC 27/P0710: ATF TEMPERATURE SENSOR  under DIAGNOSTIC TESTS.
  31. Turn ignition switch to ON position. Ensure Subaru Select Monitor is on. Using Subaru Select Monitor, read inhibitor switch data. LED should illuminate on Subaru Select Monitor when each gear range is selected. If LED illuminates properly with each gear range, go to next step. If LED does not illuminate properly, check inhibitor switch. See INHIBITOR SWITCH TEST  under CIRCUIT TESTS.
  32. Start engine and allow it to idle. Turn Subaru Select Monitor on. Using Subaru Select Monitor, monitor ABS signal data. If ABS switch LED illuminates, check ABS signal circuit. See appropriate ANTI-LOCK article in BRAKES. If ABS switch LED does not illuminate, go to next step.

  33. Throttle Position Sensor Power Supply

    Turn ignition switch to ON position. Ensure Subaru Select Monitor is on. Using Subaru Select Monitor, read throttle position sensor power supply data. If Subaru Select Monitor reading is between 4.8-5.3 volts, go to next step. If Subaru Select Monitor reading is not 4.8-5.3 volts, perform throttle position sensor power supply circuit check. Go to DTC 31/P1700: THROTTLE POSITION SENSOR  .

  34. Intake Manifold Pressure Signal

    Start engine and warm to normal operating temperature. Engine coolant must reach 176°F (80°C). Allow engine to idle. Place selector lever in "N" position. Using Subaru Select Monitor, monitor intake manifold pressure sensor data. Slowly open throttle to fully open position and back to fully closed position. If Subaru Select Monitor voltage reading changes smoothly with throttle position, go to next step. If Subaru Select Monitor voltage reading does not change smoothly with throttle position, perform intake manifold pressure signal circuit check. Go to DTC 45: INTAKE MANIFOLD PRESSURE SIGNAL  .
  35. Replace ECM with known good unit. If problem is still present, go to next step. If problem is no longer present, ECM was faulty component. Retest system.
  36. Reinstall previously replaced ECM. Replace TCM and retest. If problem is still present, go to next step. If problem is no longer present, TCM was faulty component. Retest system.

  37. Torque Converter Turbine Speed Sensor

    Raise vehicle and secure with safety stands. Ensure all wheels are off floor. Turn ignition switch to ON position. Turn Subaru Select Monitor on. Start engine and allow to idle. Using Subaru Select Monitor, monitor torque converter turbine speed sensor data. Compare torque converter turbine speed sensor reading with Subaru Select Monitor reading. Slowly increase vehicle speed. If torque converter turbine speed sensor reading increases with Subaru Select Monitor reading, go to next step. If torque converter turbine speed sensor reading does not increase with Subaru Select Monitor reading, perform torque converter turbine speed sensor circuit check. Go to DTC 36/P0715: TORQUE CONVERTER TURBINE SPEED SENSOR  .

  38. 2-4 Brake Duty Solenoid

    Start engine and warm transaxle to normal operating temperature. ATF must reach 176°F (80°C). Turn ignition switch to OFF position, then to ON position (engine off). Place selector lever in "N" position. Using Subaru Select Monitor, monitor data of 2-4 brake duty solenoid with throttle fully closed. If Subaru Select Monitor reading is 100 percent, go to next step. If Subaru Select Monitor reading is not 100 percent, go to step  41 .
  39. Using Subaru Select Monitor, monitor data of 2-4 brake duty solenoid with throttle fully open. If Subaru Select Monitor reading is 10-20 percent, go to next step. If Subaru Select Monitor reading is not 10-20 percent, go to step  41 .
  40. Using Subaru Select Monitor, monitor data of 2-4 brake duty solenoid. Slowly allow throttle to move to fully closed position from the fully open position. If Subaru Select Monitor reading changes smoothly, perform FWD switch check. Go to FWD SWITCH TEST  under CIRCUIT TESTS. If Subaru Select Monitor reading does not change smoothly, go to next step.
  41. Perform throttle position sensor circuit check. Go to step  7 . If throttle position sensor and circuit are okay, go to next step. If throttle position sensor or circuit is not okay, perform throttle position sensor and circuit diagnostics. Go to DTC 31/P1700: THROTTLE POSITION SENSOR  under DIAGNOSTIC TESTS.
  42. Perform engine speed signal circuit check. Go to step  4 . If engine speed signal circuit is okay, go to next step. If engine speed signal circuit is not okay, perform engine speed signal circuit diagnostics. Go to DTC 11/P0725: ENGINE SPEED SIGNAL  under DIAGNOSTIC TESTS.
  43. Perform ATF temperature sensor circuit check. Go to step  5 . If ATF temperature sensor and circuit are okay, go to next step. If ATF temperature sensor or circuit are not okay, perform ATF temperature sensor and circuit diagnostics. Go to DTC 27/P0710: ATF TEMPERATURE SENSOR  under DIAGNOSTIC TESTS.
  44. Turn ignition switch to ON position. Ensure Subaru Select Monitor is on. Using Subaru Select Monitor, read inhibitor switch data. LED should illuminate on Subaru Select Monitor when each gear range is selected. If LED illuminates properly with each gear range, check and repair FWD switch or circuit as necessary. Go to FWD SWITCH TEST  under CIRCUIT TESTS. If FWD switch and circuit are okay, go to next step. If LED does not illuminate properly, check inhibitor switch. See INHIBITOR SWITCH TEST  under CIRCUIT TESTS.

  45. Brake Switch

    Turn ignition switch to ON position. Ensure Subaru Select Monitor is on. Using Subaru Select Monitor, read brake switch data. Brake LED indicator should illuminate on Subaru Select Monitor when brake pedal is applied. If brake LED indicator illuminates when brake pedal is applied, go to next step. If brake LED does not illuminate when brake pedal is applied, check brake switch circuit. Go to DTC P0703: BRAKE SWITCH INPUT MALFUNCTION  under DIAGNOSTIC TESTS.

  46. ABS Switch

    Ensure ignition switch and Subaru Select Monitor are on. Using Subaru Select Monitor, read ABS switch data. ABS LED indicator should illuminate on Subaru Select Monitor. If ABS LED indicator illuminates, check ABS switch circuit. See appropriate ANTI-LOCK article in BRAKES. If ABS LED does not illuminate, go to next step.

  47. Cruise Control Switch

    Raise vehicle on hoist and secure with safety stands. Start engine. Turn cruise control main switch to ON position. Place selector lever in "D" position and slowly increase vehicle speed to 31 MPH. Press cruise control SET switch to ON position. Using Subaru Select Monitor, read cruise control switch data. Cruise control LED indicator should illuminate on Subaru Select Monitor. If cruise control LED indicator illuminates, check and repair inhibitor switch or circuit as necessary. Go to INHIBITOR SWITCH TEST  under CIRCUIT TESTS. If inhibitor switch and circuit are okay, go to next step. If cruise control LED does not illuminate, check cruise control system. See appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT.

  48. Shift Solenoid No. 1

    Ensure ignition switch and Subaru Select Monitor are on. Using Subaru Select Monitor, read shift solenoid No. 1 data. Shift solenoid No. 1 LED indicator should illuminate on Subaru Select Monitor. If shift solenoid No. 1 LED indicator illuminates, go to next step. If shift solenoid No. 1 LED does not illuminate, perform shift solenoid No. 1 circuit diagnostics. Go to DTC 71/P0753: SHIFT SOLENOID NO. 1  under DIAGNOSTIC TESTS.

  49. Shift Solenoid No. 2

    Ensure ignition switch and Subaru Select Monitor are on. Using Subaru Select Monitor, read shift solenoid No. 2 data. Shift solenoid No. 2 LED indicator should illuminate on Subaru Select Monitor. If shift solenoid No. 2 LED indicator illuminates, go to next step. If shift solenoid No. 2 LED does not illuminate, perform shift solenoid No. 2 circuit diagnostics. Go to DTC 72/P0758: SHIFT SOLENOID NO. 2  under DIAGNOSTIC TESTS.

  50. Torque Control Signal No. 1

    Ensure ignition switch and Subaru Select Monitor are on. Using Subaru Select Monitor, read torque control signal No. 1 data. Torque control signal No. 1 LED indicator should illuminate on Subaru Select Monitor. If torque control signal No. 1 LED indicator illuminates, go to next step. If torque control signal No. 1 LED does not illuminate, perform torque control signal No. 1 circuit diagnostics. Go to DTC 38: ENGINE TORQUE CONTROL SIGNAL 1 & 2  under DIAGNOSTIC TESTS.

  51. Torque Control Signal No. 2

    Ensure ignition switch and Subaru Select Monitor are on. Using Subaru Select Monitor, read torque control signal No. 2 data. Torque control signal No. 2 LED indicator should illuminate on Subaru Select Monitor. If torque control signal No. 2 LED indicator illuminates, go to next step. If torque control signal No. 2 LED does not illuminate, perform torque control signal No. 2 circuit diagnostics. Go to DTC 38: ENGINE TORQUE CONTROL SIGNAL 1 & 2  under DIAGNOSTIC TESTS.

  52. 2-4 Brake Timing Solenoid

    Ensure ignition switch and Subaru Select Monitor are on. Place selector lever in "1" position. Using Subaru Select Monitor, read 2-4 brake timing solenoid data. 2-4 brake timing solenoid LED indicator should illuminate on Subaru Select Monitor. If 2-4 brake timing solenoid LED indicator illuminates, go to next step. If 2-4 brake timing solenoid LED does not illuminate, perform 2-4 brake timing solenoid circuit diagnostics. Go to DTC 74/P01704: 2-4 BRAKE TIMING CONTROL SOLENOID  under DIAGNOSTIC TESTS.

  53. Low Clutch Timing Solenoid

    Ensure ignition switch and Subaru Select Monitor are on. Place selector lever in "2" position. Using Subaru Select Monitor, read low clutch timing solenoid data. Low clutch timing solenoid LED indicator should illuminate on Subaru Select Monitor. If low clutch timing solenoid LED indicator illuminates, go to next step. If low clutch timing solenoid LED does not illuminate, perform low clutch timing solenoid circuit diagnostics. Go to DTC 73/P1703: LOW CLUTCH TIMING CONTROL SOLENOID VALVE CIRCUIT MALFUNCTION  under DIAGNOSTIC TESTS.

  54. AT OIL TEMP Indicator

    Turn ignition switch to ON position (engine off). If AT OIL TEMP indicator illuminates, go to next step. If AT OIL TEMP indicator does not illuminate, check AT OIL TEMP indicator circuits. Go to AT OIL TEMP INDICATOR  under CIRCUIT TESTS.

  55. FWD Indicator

    Ensure ignition switch and Subaru Select Monitor are on. Using Subaru Select Monitor, read FWD indicator data. FWD indicator LED should illuminate on Subaru Select Monitor. If FWD indicator LED illuminates, perform FWD switch check. Go to FWD SWITCH TEST  under CIRCUIT TESTS. If FWD indicator LED does not illuminate, diagnose by symptom. See SYMPTOM DIAGNOSIS under TROUBLE SHOOTING in SUBARU 4-ATAXLE OVERHAUL article.

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