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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P0785) >> DTC P0712 (M30/M32) >> 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 for a short to ground condition.
  2. 4:  This step tests for an internal fault within the transmission by creating an open.
DTC P0712

Step Action Values Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Inspect for correct transmission fluid level.
Refer to Transmission Fluid Checking Procedure .
Did you perform the fluid checking procedure?		 - Go to Step 3  Go to Transmission Fluid Checking Procedure
3
  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 Failure Records. Using the Clear Info function erases the Failure Records from the PCM.
  3. Record the DTC Failure Records.
  4. Clear the DTC.
Does the scan tool displays a TFT Sensor signal voltage greater than the specified value?		 0.2 V Go to Testing for Intermittent Conditions and Poor Connections Go to Step 4 
4
  1. Turn OFF the ignition.
  2. Disconnect the AT inline 20-way connector, additional DTCs may set.
  3. Turn ON the ignition, with the engine OFF.
Does the scan tool displays a TFT Sensor signal voltage greater than the specified value?		 4.92 V Go to Step 5  Go to Step 7 
5
  1. Install the J 44152  Jumper Harness (20 pins) on the transmission side of the AT inline 20-way connector. See Special Tools .
  2. Using the DMM and the J 35616  GM Terminal Test Kit, measure the resistance between the TFT sensor signal and low reference circuits of the J 44152  . See Special Tools .

    Refer to Automatic Transmission Inline 20-Way Connector End View (M30/M32) or Automatic Transmission Inline 20-Way Connector End View (M33 Only) .

Does the resistance measure within the specified range?		 3,088-3,942 Ω at 20°C (68°F)
159-198 Ω at 100°C (212°F)		 Go to Testing for Intermittent Conditions and Poor Connections Go to Step 6 
6 Test the signal circuit of the TFT sensor for a short to ground between the AT inline 20-way connector and the TFT sensor.
Refer to Testing for Short to Ground .
Did you find a short to ground condition?		 - Go to Step 9  Go to Step 8 
7 Test the signal circuit of the TFT sensor for a short to ground between the PCM and the AT inline 20-way connector.
Refer to Testing for Short to Ground and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
8 Replace the TFT sensor, this sensor is part of the TFP manual valve position switch.
Refer to Valve Body and Pressure Switch Replacement .
Did you complete the replacement?		 - Go to Step 11  -
9 Replace the AT wiring harness assembly.
Refer to Valve Body and Pressure Switch Replacement .
Did you complete the replacement?		 - Go to Step 11  -
10 Replace the PCM.
Refer to Control Module References .
Did you complete the replacement?		 - Go to Step 11  -
11 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Turn ON the ignition, with the engine OFF.
  4. Verify that the scan tool indicates a TFT Sensor signal voltage greater than 0.2 volts for 10 seconds.
  5. Select Specific DTC.
  6. Enter DTC P0712.

Has the test run and passed?		 - Go to Step 12  Go to Step 2 
12 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 - Vehicle System OK
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