Transmission Control Systems
TROUBLE CODE 12: DUTY SOLENOID BDIAGNOSIS:
Output signal circuit of duty solenoid B is open or shorted.
TROUBLE SYMPTOM:
No lock-up (after engine warm-up)
FLOW CHART
WIRING DIAGRAM
1. CHECK HARNESS AND CONNECTORS BETWEEN TCM AND DUTY SOLENOID B.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM and transmission.
3) Measure resistance of harness connector between TCM and transmission connector.
Connector & terminal / Specified resistance:
(B52) No. 5 - (B9) No. 6 / 1 ohms, or less
(B52) No. 10 - (B9) No. 4 / 1 ohms, or less
4) Measure resistance of harness connector between TOM and body to make sure that circuit does not short.
Connector & terminal / Specified resistance:
(B52) No. 5 - Body / 1 Mohms or more
2. CHECK DUTY SOLENOID B's GROUND LINE.
Measure resistance between transmission connector receptacle and transmission case.
Connector & terminal / Specified resistance:
(T4) No. 4 - Transmission / 1 ohms, or less
3. CHECK DUTY SOLENOID B.
Measure resistance between transmission connector receptacle's terminals.
Connector & terminal / Specified resistance:
(T4) No. 6 - No. 4 / 9 - 17 ohms
4. CHECK OUTPUT SIGNAL EMITTED FROM TCM.
1) Connect connectors to TCM and transmission.
2) Lift-up the vehicle or set the vehicle on free roller.
CAUTION: On AWD models, raise all wheels oft floor.
3) Start and warm-up the engine and transmission.
4) Move selector lever to "D" and slowly increase vehicle speed to 75 km/h or 47 MPH. (2200 cc model)
- Move selector lever to "D" and slowly increase vehicle speed to 65 km/h or 40 MPH. (1800 cc model)
5) Measure voltage between TCM connector terminals.
Connector & terminal / Specified voltage:
(B52) No. 5 - No. 10 / 8.5 V, or more (when wheels are locked-up.)
6) Return the engine to idling speed and move selector lever to "N".
7) Measure voltage between TCM connector terminals.
Connector & terminal / Specified voltage:
(B52) No. 5 - No. 10 / 0.5 V, or less
NOTE: The speed difference between front and rear wheels may light either the ABS warning light, but this indicates no malfunctions. When AT control diagnosis is finished, perform the ABS memory clearance procedure of self-diagnosis system.
- Using Subaru select monitor:
(1) Connect connectors to TCM and transmission.
(2) Lift-up the vehicle or set the vehicle on free roller.
CAUTION: On AWD models, raise all wheels off floor.
(3) Turn ignition switch to OFF.
(4) Connect the Subaru select monitor to data link connector.
(5) Turn ignition switch to ON and Subaru select monitor switch to ON.
(6) Start and warm-up the engine and transmission.
(7) Designate mode using function key.
Function mode: F12
(8) Move selector lever to "D" and slowly increase vehicle speed to 75 km/h or 47 MPH. (2200 cc model)
- Move selector lever to "D" and slowly increase vehicle speed to 65 km/h or 40 MPH. (1800 cc model)
(9) Read data on Subaru select monitor.
SPECIFIED DATA:
- 95% (Wheel locked-up)
- 5% (Released)
NOTE: The speed difference between front and rear wheels may light either the ABS warning light, but this indicates no malfunctions. When AT control diagnosis is finished, perform the ABS memory clearance procedure of self-diagnosis system.