DTC P0712, P0713, P1713, P1718[LA4AX-EL (CD4E)]

id050207806000

DTC P0712

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

DTC P0713

Transaxle fluid temperature (TFT) sensor circuit malfunction (open circuit/short to power supply)

DTC P1713

ATF signal stuck at low temperature.

DTC P1718

ATF signal stuck at high temperature.
DETECTION CONDITION
•  P0712: PCM detects that ATF signal output from ATF sensor is 150° C {302° F} or more
•  P0713: PCM detects ATF signal from ATF sensor is–40° C {–40° F} or less
•  P1713: ATF signal from ATF sensor does not change from –40° C {–40° F} or less
•  P1718: ATF signal from ATF sensor does not change from 150° C {302° F} or more
POSSIBLE CAUSE
•  TFT sensor malfunction
•  Short to ground in wiring harness between TFT sensor and ATX terminal E
•  Short to ground in wiring harness between TFT sensor and ATX terminal H
•  Short to ground in wiring harness between ATX terminal E and PCM terminal 91
•  Short to ground in wiring harness between ATX terminal H and PCM terminal 37
•  Open circuit in wiring harness between TFT sensor and ATX terminal E
•  Open circuit supply in wiring harness between TFT sensor and ATX terminal H
•  Open circuit supply in wiring harness between ATX terminal E and PCM terminal 91
•  Open circuit supply in wiring harness between ATX terminal H and PCM terminal 37
•  Short to power supply in wiring harness between TFT sensor and ATX terminal E
•  Short to power supply in wiring harness between TFT sensor and ATX terminal H
•  Short to power supply in wiring harness between ATX terminal E and PCM terminal 91
•  Short to power supply in wiring harness between ATX terminal H and PCM terminal 37
•  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 SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT ATX CONNECTOR FOR POOR CONNECTION
•  Turn the ignition switch to the LOCK position.
•  Inspect ATX connector connection.
•  Disconnect the ATX connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is the connection normal?
Yes
Go to the next step.
No
Repair or replace the connector and/or terminals, then go to Step 9.
4
INSPECT TFT SENSOR
•  Inspect the TFT sensor.
•  Is TR switch normal?
Yes
Go to the next step.
No
Replace the TFT sensor, then go to Step 9.
5
INSPECT PCM CONNECTOR FOR POOR CONNECTION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is the connection normal?
Yes
Go to the next step.
No
Repair or replace the connector and/or terminals, then go to Step 9.
6
INSPECT TFT SENSOR CIRCUIT FOR SHORT TO GROUND
•  Inspect for continuity between ATX terminals (wiring harness-side) and body ground.
―  E and body ground
―  H and body ground
•  Is there continuity?
Yes
Repair or replace the wiring harness, then go to Step 9.
No
Go to the next step.
7
INSPECT TFT SENSOR CIRCUIT FOR OPEN CIRCUIT
•  Inspect the following ATX terminals (wiring harness-side) and PCM terminals (wiring harness-side):
―  E and 91
―  H and 37
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness, then go to Step 9.
8
INSPECT TFT SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY
•  Turn the ignition switch to the ON position (engine off).
•  Inspect the voltage at ATX terminals E and H (wiring harness-side).
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness, then go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P0712, P0713, P1713 OR P1718 COMPLETED
•  Make sure to reconnect all the disconnected connectors.
•  Clear the DTC from the memory using the M-MDS.
•  Perform the “After Repair Procedure”.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)
No
Go to the next step.
10
VERIFY DTCS
•  Are except DTC P0712, P0713, P1713 and P1718 output?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE[LA4AX-EL (CD4E)].)
No
DTC troubleshooting completed.