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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1487 (Automatic Transaxle - AF33-5 (DTC P0562 - P0762)) >> Diagnostic Information & Procedures >> DTC P0712 >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

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 Values Yes No
1 Did you perform the Diagnostic System Check - Engine Controls? - Go to Step 2  Go to DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS
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 Eng./Trans. DTC Info function erases the Failure Records from the ECM and TCM.
    • Using the Clear Eng./Trans. DTC 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?		 0°C-150°C (32°F-302°F) Go to Step 3  Go to INTERMITTENTS
3 
  1. Turn OFF the ignition.
  2. Disconnect the automatic transmission 14-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 Transmission Fluid Temperature sensor signal circuit (CKT 585) from the transmission 14-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 Wiring Harness Removal .
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. Start the engine and verify the following conditions:
    • The Trans. Fluid Temp. must be between 0°C (32°F) and 150°C (302°F) for 5 minutes.
    • The Trans. Fluid Temp. must change by greater than 5°C (41°F) since engine start-up.
  4. Select Specific DTC.
  5. Enter DTC P0712.

Does the DTC reset?		 150°C (302°F) Go to Step 2  Go to Step 8 
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 DEFINITIONS System OK
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