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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 143 (Automatic Transmission - 4L80-E/4L85-E - DTC P0218 To DTC P0976) >> DTC P0741 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. 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. 2:  This step tests for excessive TCC slip when TCC is commanded on.
  2. 3:  This step inspects for possible causes of no TCC apply.
DTC P0741

Step Action Value Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Install a scan tool.
    2. IMPORTANT: Before clearing the DTCs, use the scan tool in order to record the ECM and TCM Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the ECM and TCM.
  2. Record the Freeze Frame and Failure Records.
  3. Clear the DTCs.
  4. Drive the vehicle in D3.
  5. Record TCC Slip Speed and TCC Duty Cycle data using the scan tool snapshot mode.
Is the TCC slip speed snapshot data greater than the specified value when the TCC duty cycle is commanded greater than 65% for greater than 5 seconds?		 125 RPM Go to Step 3  Go to Diagnostic Aids
3  Inspect the TCC PWM solenoid valve for being mechanically Stuck OFF. Refer to Torque Converter Clutch Valve and Spring Replacement .
Did you find and correct the condition?		 - Go to Step 5  Go to Step 4 
4
  1. Inspect the transmission for the following conditions:
  2. Repair any of the above conditions as necessary.
Did you complete the repair?		 - Go to Step 5  -
5 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:
    • Drive the vehicle in D3 with steady acceleration and TP over 8%.
    • TCC duty cycle is greater than 65%.
    • The TCM must see a TCC slip speed between -25 RPM and 25 RPM for 4 seconds or greater.
  4. Select Specific DTC.
  5. Enter DTC P0741.

Has the test run and passed?		 - Go to Step 6  Go to Step 2 
6 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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