Diagnostic Procedure

8G1: CHECK TORQUE CONVERTER TURBINE SPEED SENSOR.
1. Turn ignition switch to OFF.
2. Disconnect connector from transmission.
3. Measure resistance between transmission connector receptacle's terminals.
Connector & Terminal

(T4) No. 14 - No. 15:

Fig 1: Measuring Resistance Between Transmission Connector Receptacle's Terminals

CHECK: Is the resistance between 450 and 650 ohm?
1. YES: Go to step 8G2.
2. NO: Replace torque converter turbine speed sensor, see
  
  Fig 2: Identifying Vehicle Speed Sensor 2 & Torque Converter Turbine Speed Sensor
8G2: CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION.
Measure resistance of harness between TCM and transmission connector.

Connector & Terminal

(B55) No. 12 - (B11) No. 14:

Fig 3: Measuring Resistance Of Harness Between TCM & Transmission Connector

CHECK: Is the resistance less than 1 ohm?
1. YES: Go to step 8G3.
2. NO: Repair open circuit in harness between TCM and transmission connector.
8G3: CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION.
Measure resistance of harness between TCM and transmission connector.

Connector & Terminal

(B55) No. 21 - (B11) No. 15:

Fig 4: Measuring Resistance Of Harness Between TCM & Transmission Connector

CHECK: Is the resistance less than 1 ohm?
1. YES: Go to step 8G4.
2. NO: Repair open circuit in harness between TCM and transmission connector.
8G4: CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION.
Measure resistance of harness between TCM and chassis ground.

Connector & Terminal

(B55) No. 21 - Chassis ground:

Fig 5: Measuring Resistance Of Harness Between TCM & Chassis Ground

CHECK: Is the resistance more than 1 Mohm?
1. YES: Go to step 8G5.
2. NO: Repair short circuit in harness between TCM and transmission connector.
8G5: CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION.
Measure resistance of harness between TCM and chassis ground.

Connector & Terminal

(B55) No. 12 - Chassis ground:

Fig 6: Measuring Resistance Of Harness Between TCM & Chassis Ground

CHECK: Is the resistance more than 1 Mohm?
1. YES: Go to step 8G6.
2. NO: Repair short circuit in harness between TCM and transmission connector.
8G6: PREPARE OSCILLOSCOPE.
CHECK: Do you have oscilloscope?
1. YES: Go to step 8G10.
2. NO: Go to step 8G7.
8G7: PREPARE SUBARU SELECT MONITOR.
CHECK: Do you have a Subaru Select Monitor?
1. YES: Go to step 8G9.
2. NO: Go to step 8G8.
8G8: CHECK INPUT SIGNAL FOR TCM.
1. Connect connector to transmission.
2. Lift-up or raise the vehicle and support with safety stand.
  CAUTION: On AWD models, raise all wheels off ground.
3. Start the engine and set vehicle in 20 km/h (12 MPH) condition.
  NOTE: The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system. See CLEARING MEMORY-ABS .
4. Measure voltage between TCM connector terminals.
Connector & Terminal

(B55) No. 12 (+) - No. 21 (-):

Fig 7: Measuring Voltage Between TCM Connector Terminals

CHECK: Is the voltage more than AC 1 V?
1. YES: Even if "AT OIL TEMP" lights up, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be the cause. Repair harness or connector in the TCM and transmission
2. NO: Go to step 8G11.
8G9: CHECK INPUT SIGNAL FOR TCM USING SUBARU SELECT MONITOR.
1. Connect connector to transmission.
2. Connect Subaru Select monitor to data link connector.
  
  Fig 8: Identifying Location Data Link Connector (DLC)
3. Lift-up or raise the vehicle and support with safety stand.
  CAUTION: On AWD models, raise all wheels off ground.
4. Turn ignition switch to ON and turn Subaru Select Monitor switch to ON.
5. Start the engine.
6. Read data of vehicle speed using Subaru Select Monitor.
  - Compare speedometer with Subaru Select Monitor indications.
  - Vehicle speed is indicated in "km/h" or "MPH".
7. Slowly increase vehicle speed to 20 km/h or 12 MPH.
NOTE: The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system. See CLEARING MEMORY-ABS .

CHECK: Is the revolution value same as the tachometer reading shown on the combination meter?
1. YES: Even if "AT OIL TEMP" lights up, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be the cause. Repair harness or connector in the TCM and transmission.
2. NO: Go to step 8G11.
8G10: CHECK INPUT SIGNAL FOR TCM USING OSCILLOSCOPE.
1. Connect connector to transmission.
2. Lift-up or raise the vehicle and support with safety stand.
  CAUTION: On AWD moels, raise all wheels off ground.
3. Set oscilloscope to TCM connector terminals.
  Position probe; (B55) No. 12.
  
  Earth lead; (B55) No. 21.
  
  Fig 9: Setting Oscilloscope To TCM Connector Terminals
4. Start the engine and set vehicle in 20 km/h (12 MPH) condition.
  NOTE: The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system. See CLEARING MEMORY-ABS .
5. Measure signal voltage indicated on oscilloscope.
  
  Fig 10: Measuring Signal Voltage Indicated On Oscilloscope
CHECK: Is the signal voltage more than AC 1 V?
1. YES: Even if "AT OIL TEMP" lights up, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be the cause. Repair harness or connector in the TCM and transmission.
2. NO: Go to step 8G11.
8G11: CHECK POOR CONTACT.
CHECK: Is there poor contact in torque converter turbine speed sensor circuit?
1. YES: Repair poor contact.
2. NO: Replace TCM, see TRANSMISSION CONTROL MODULE (TCM) .