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Subaru Crosstrek Service Manual: Dtc p0712 transmission fluid temperature sensor "a" circuit low

CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0712 TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT LOW

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Excessive shift shock

Shift characteristics malfunction

CAUTION:

Use the check board when measuring the TCM terminal voltage and resistance.

Wiring diagram:

CVT control system CVT Control System">

STEPCHECKYESNO

1.CHECK HARNESS.

1) Turn the ignition switch to OFF.

2) Disconnect the TCM connector.

3) Measure the resistance of harness between TCM connector and chassis ground.

Connector & terminal

(B54) No. 1 — Chassis ground:

(B54) No. 6 — Chassis ground:

Is the resistance 1 M? or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0712 TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT LOW">Go to Step 4.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0712 TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT LOW">Go to Step 2.

2.CHECK HARNESS.

1) Disconnect the transmission connector.

2) Measure the resistance between transmission connector and transmission body.

Connector & terminal

(T4) No. 5 — Transmission body:

(T4) No. 9 — Transmission body:

Is the resistance 1 M? or more?

Repair the short circuit of body harness.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0712 TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT LOW">Go to Step 3.

3.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 there any fault in the harness?

Replace the transmission harness.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0712 TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT LOW">Go to Step 4.

4.CHECK ATF TEMPERATURE SENSOR.

Measure the resistance between transmission connector terminals.

Connector & terminal

(T11) No. 1 — No. 6:

NOTE:

Perform the measurements using multiple oil temperatures.

Is resistance as follows?
Fluid temperature 0°C > Approx. 6.0 k?
Fluid temperature 20°C > Approx. 2.5 k?
Fluid temperature 80°C > Approx. 330 ?

Replace the TCM. Transmission Control Module (TCM)">

Replace the control valve body. Control Valve Body">

1. OUTLINE OF DIAGNOSIS

Detect the ground short circuit of transmission oil temperature sensor.

Judge as NG if the voltage detected by the transmission oil temperature sensor is lower than the predetermined value.

2. EXECUTION CONDITION

Secondary Parameters

Execution condition

12 V battery system voltage

≥ 9 V

3. DIAGNOSTIC METHOD

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria

Threshold Value

Measured Transmission fluid temperature sensor input voltage

< 0.117 V

(Transmission fluid temperature)

(> 146 degC)

Time Needed for Diagnosis: 1 second

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

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