Transmission Control Systems
TROUBLE CODE 12DUTY SOLENOID B
Diagnosis
Output signal circuit of Duty Solenoid B is open or shorted.
Trouble Symptom
No "locking-up" (after Engine warm-up).
1. Check harness and connectors between Transmission Control Module (TCM) and Duty Solenoid B.
a. Turn Ignition Switch to "OFF".
b. Disconnect connectors from TCM and Transmission.
c. Measure resistance of harness connector between TCM and Transmission connector.
Connector & Terminal / Specified Resistance:
(B55) No. 5 - (B11) No. 6 / 1 Ohm, or less.
(B55) No. 10 - (B11) No. 4 / 1 Ohm, or less.
d. Measure resistance of harness connector between TCM and body to make sure that circuit does not short.
Connector & Terminal / Specified Resistance:
(B55) No. 5 - Body / 1 M-Ohm, or more.
2. Check Duty Solenoid B 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.
a. Connect connectors to TCM and Transmission.
b. Lift-up the vehicle or set the vehicle on free roller.
CAUTION: On AWD models, raise all wheels off floor.
c. Start and warm-up the Engine and Transmission.
d. Push the TCS "OFF" switch to "ON". (With TCS models)
e. Move Selector Lever to "D" and slowly increase vehicle speed to 70 km/h (43 MPH).
f. Measure voltage between TCM connector terminals.
Connector & Terminal / Specified voltage:
(B55) No. 5 - No. 10 / 8.5 Volts, or more (when wheels are locked-up.)
g. Return the Engine to idling speed and move Selector Lever to "N".
h. Measure voltage between TCM connector terminals.
Connector & Terminal / Specified voltage:
(B55) No. 5 - No. 10 / 0.5 Volts, or less.
NOTE: The speed difference between front and rear wheels may light either the ABS or the ABS/TCS warning light, but this indicates no malfunctions. When A/T control diagnosis is finished, perform the ABS or the ABS/TCS 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. Push the TCS "OFF" switch to "ON". (With TCS models)
8. Designate mode using function key.
Function mode: F12
9. Move Selector Lever to "D" and slowly increase vehicle speed to 70 km/h (43 MPH).
10. 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 or the ABS/TCS warning light but this indicates no malfunctions. When A/T control diagnosis is finished perform the ABS or the ABS/TCS memory clearance procedure of self-diagnosis system.