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Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 28 (Automatic Transmission - 5L40-E (DTC P0115 To P0742)) >> Automatic Transaxle Diagnosis >> DTC P0712 >> 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. 3:  This step tests the ability of the TCM to detect an open circuit. If the TCM recognizes the open, this eliminates the TCM and the wiring up to the transmission connector. The fault must be internal to the transmission.
  2. 5:  Because the TFT is an integral part of the transmission wiring, the entire harness must be replaced.
DTC P0712

Step Action Value(s) Yes No
1 Did you perform the Diagnostic System Check - Automatic Transmission? - Go to Step 2  Go to Diagnostic System Check - Automatic Transmission
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
    3. IMPORTANT:
    • Before clearing the DTC, use the scan tool in order to record the ECM and the TCM Failure Records. Using the Clear Info function erases the Failure Records from the ECM and TCM.
    • Using the Clear Info function erases stored DTCs in both the ECM and TCM.
  3. Record the Failure Records.
  4. Clear the DTCs.
  5. Select Trans. Fluid Temp. on the scan tool.
Does the scan tool display transmission fluid temperature equal to or greater than the specified value?		 150°C (302°F) Go to Step 3  Go to Intermittent Conditions in Engine Controls - 2.6L and 3.2L or Intermittent Conditions in Engine Controls - 3.6L (LY7)
3 
  1. Turn OFF the ignition.
  2. Disconnect the transmission 20-way harness connector. Additional DTCs may set.
  3. Turn ON the ignition, with the engine OFF.
Does the scan tool display transmission fluid temperature equal to the specified value?		 -40°C (-40°F) Go to Step 5  Go to Step 4 
4 Test the TFT signal circuit from the transmission 20-way harness to the TCM for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 7  Go to Step 6 
5  Replace the automatic transmission internal wiring harness assembly. Refer to Transmission Internal Electrical Harness Replacement .
Is the action complete?		 - Go to Step 7  -
6 Replace the TCM. Refer to Transmission Control Module (TCM) Replacement .
Is the action complete?		 - Go to Step 7  -
7 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 150°C (302°F) or less for 2 seconds.
  4. Select Specific DTC.
  5. Enter DTC P0712.

Has the test run and passed?		 150°C (302°F) Go to Step 8  Go to Step 2 
8 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 - 2.6L and 3.2L or Diagnostic Trouble Code (DTC) List in Engine Controls - 3.6L (LY7) System OK
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