DTC P0974: Shift Solenoid "A" Control Circuit High: Notes

1. -

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Gear is not changed. (No up-shift)

Wiring diagram:

CVT control system Ref. to WIRING SYSTEM>CVT CONTROL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION:

Use CHECK BOARD when measuring the TCM terminal voltage and resistance.
After servicing or replacing faulty parts, perform the last step of the basic diagnostic procedure. Ref. to TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

CHECK PRIMARY UP SOLENOID (WHEN THE ENGINE IS COLD: ATF TEMPERATURE APPROX. 20°C) .
1. Using the Subaru Select Monitor, check that [ATF Temp.] is 20°C.
2. Turn the ignition switch to OFF.
3. Disconnect the TCM connector.
4. Measure the resistance between TCM connector and transmission body.
Connector & terminal

(T10) No. 47 - Transmission body:

Is the resistance approximately 10 - 14.2 Ω?

Yes : Go to 2 .

No : Go to 3 .
CHECK PRIMARY UP SOLENOID (WHEN THE ENGINE IS WARMED-UP: ATF TEMPERATURE 80°C OR MORE) .
1. Connect the TCM connector.
2. Using the Subaru Select Monitor, warm up the engine until [ATF Temp.] reaches 80°C or more.
3. Turn the ignition switch to OFF.
4. Disconnect the TCM connector.
5. Measure the resistance between TCM connector and transmission body.
Connector & terminal

(T10) No. 47 - Transmission body:

NOTE: The resistance value increases as the temperature increases.

Is the resistance 1 MΩ or more?

Yes : Go to 3 .

No : Check for poor contact of connector, and if no fault is found, replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSMISSION CONTROL MODULE (TCM) .
CHECK HARNESS INSIDE TRANSMISSION .
CAUTION: Start work after ATF cools down.
1. Remove the transmission valve cover.
2. Check for the harness pinch, damage.
Is the check result OK?

Yes : Go to 4 .

No : Repair or replace the harness.
CHECK TRANSMISSION HARNESS (OPEN CIRCUIT) .
1. Disconnect the control valve body connector.
2. Measure the resistance between TCM connector and control valve body connector.
Connector & terminal

(T10) No. 47 - (T11) No. 2:

Is the resistance less than 1 Ω?

Yes : Go to 5 .

NO Repair or replace the harness.
CHECK TRANSMISSION HARNESS (SHORT TO POWER SUPPLY) .
1. Turn the ignition switch to ON.
2. Measure the voltage between TCM connector and transmission body.
Connector & terminal

(T10) No. 47 (+) - Transmission body (-):

Is the voltage approx. 0 V?

Yes : Replace the control valve body. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>CONTROL VALVE BODY .

No : Repair or replace the harness.