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Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Manual Transmission - TREMEC 6-Speed) >> Diagnostic Information and Procedures >> DTC P0712: Transmission Fluid Temperature (TFT) Sensor Circuit Low Input >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step determines if the malfunction is present.
  2. 3:  Using the Freeze Frame/Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame/Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions, such as RPM, load, vehicle speed, temperature, that you observed. This will isolate when the DTC failed.
  3. 4:  A TFT below -30°C(-22°F) indicates that the PCM and TFT sensor wiring if functioning correctly.
  4. 5:  Disconnecting the PCM enables the DMM to test continuity of the circuits. This aids in locating an open or a shorted circuit.
  5. 7:  Inspect for proper terminal tension/connections at the PCM harness before replacing the PCM.
DTC P0712

Step Action Values Yes No
1 Did you perform the Diagnostic System Check - Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls in Engine Controls - 5.7L
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Monitor the TFT sensor display on the Engine 3 Data List of the scan tool.
Is the TFT sensor above the specified value?		 150°C (302°F) Go to Step 4  Go to Step 3 
3 
  1. Turn ON the ignition, with the engine OFF.
  2. Review the Freeze Frame/Failure Records data for this DTC and observe the parameters.
  3. Turn OFF the ignition for 15 seconds.
  4. Start the engine.
  5. Operate the vehicle within the conditions required for this diagnostic to run, and as close to the conditions recorded in the Freeze Frame/Failure Records as possible. Special operating conditions that you need to meet before the PCM will run this diagnostic, where applicable, are listed in Conditions for Running the DTC.
  6. Select the Diagnostic Trouble Code (DTC) option, the Specific DTC option, then enter the DTC number using the scan tool.
Does the scan tool indicate that the diagnostic failed this ignition?		 - Go to Step 4  Go to Diagnostic Aids
4 
  1. Disconnect the TFT sensor electrical connector.
  2. Observe the TFT sensor display on the scan tool.
Is the TFT sensor below the specified value?		 -30°C (-22°F) Go to Step 6  Go to Step 5 
5 
  1. Turn OFF the ignition.
  2. Disconnect the PCM connector C2.
  3. Test the TFT sensor signal circuit for a short to a ground. Refer to Testing for Short to Ground in Wiring Systems.
  4. If you find the TFT sensor signal circuit is grounded, repair the circuit as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find the TFT sensor signal circuit grounded?		 - Go to Step 8  Go to Step 7 
6 Replace the TFT sensor.
Refer to Transmission Fluid Temperature (TFT) Sensor Replacement .
Is the action complete?		 - Go to Step 8  -
7  Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 5.7L.
Is the action complete?		 - Go to Step 8  -
8 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Operate the vehicle under the following conditions:
    • Turn ON the ignition, with the engine OFF.
    • The Trans. Fluid Temp. must be 144°C (291°F) or less for 2 seconds.
  4. Select Specific DTC.
  5. Enter DTC P0712

Has the test run and passed?		 - Go to Step 9  Go to Step 2 
9 With the scan tool, observe the stored information, capture info and DTC info.
Does the scan tool display any DTCs that you have not diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 5.7L System OK
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