DTC P0712 [FN4A-EL]


B3E050219090W11

DTC P0712

Transaxle fluid temperature (TFT) sensor circuit malfunction (short to ground)

DETECTION CONDITION

• If the PCM detects either of the following conditions for 150 s or more, the PCM determines that the TFT sensor circuit has a malfunction.
- TFT sensor voltage 0.06 V or less and vehicle speed 20 km/h {12 mph} or more
Diagnostic support note:
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction conditions during the first drive cycle.
• A PENDING CODE is not available.
• FREEZE FRAME DATA is available.
• The AT warning light illuminates.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• TFT sensor malfunction
• Short to ground in wiring harness between TFT sensor terminal A and ATX terminal E
• Short to ground in wiring harness between TFT sensor terminal B and ATX terminal H
• Short to ground in wiring harness between ATX terminal E and PCM terminal 1AU (Z6)/1U (LF)
• Damaged connectors between TFT sensor and PCM
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED

• Has the FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2

VERIFY RELATED REPAIR INFORMATION AVAILABILITY

• Verify related Service Bulletins and/or on-line repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3

VERIFY CURRENT INPUT SIGNAL STATUS

• Turn the ignition switch to the ON position (engine off).
• Inspect the voltage at PCM terminal 1AU (Z6)/1U (LF).
• Is the voltage above 0.06 V?
Yes
Go to the intermittent concern troubleshooting procedure.
No
Go to the next step.
4

INSPECT TERMINAL CONDITION

• Turn the ignition switch to the LOCK position.
• Disconnect the ATX connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Are the terminals bent?
Yes
Repair or replace the terminals, then go to Step 9.
• If the terminals cannot be repaired, replace the wiring harness, then go to Step 9.
No
Go to the next step.
5

INSPECT TFT SENSOR CIRCUIT

• Turn the ignition switch to the ON position (engine off).
• Verify that the voltage changes to 4.67 V or more at PCM terminal 1AU (Z6)/1U (LF) when ATX connector is disconnected.
• Does the voltage change?
Yes
Go to the next step.
No
Go to Step 8.
6

INSPECT TFT SENSOR TERMINAL CONDITION

• Turn the ignition switch to the LOCK position.
• Remove the under cover of control valve body.
• Disconnect the TFT sensor connector.
• Inspect for bent TFT sensor terminals.
• Are the terminals bent?
Yes
Repair terminals or replace the TFT sensor, then go to Step 9.
No
Go to the next step.
7

INSPECT TFT SENSOR CIRCUIT FOR SHORT TO GROUND

• Inspect for continuity between TFT sensor terminals (wiring harness-side) and body ground.
- A and body ground
- B and body ground
• Is there continuity?
Yes
Repair or replace the wiring harness, then go to Step 9.
No
Replace the TFT sensor, then go to Step 9.
8

INSPECT ATX CONNECTOR CIRCUIT FOR SHORT TO GROUND

• Turn the ignition switch to the LOCK position.
• Inspect for continuity between ATX terminal E (wiring harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness, then go to the next step.
No
Go to the next step.
9

VERIFY TROUBLESHOOTING OF DTC P0712 COMPLETED

• Make sure to reconnect all the disconnected connectors.
• Clear the DTC from the memory using the WDS or equivalent.
• Drive the vehicle under the following condition for 150 s or more.
- Vehicle speed (VSS PID) 20 km/h {12 mph} or more.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
10

VERIFY AFTER REPAIR PROCEDURE

• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.