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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 142 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P0961) >> DTC P0741 >> Test Description

Test Description

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The number below refers to the step number on the diagnostic table.

  1. 2:  This step tests the hydraulic state of the TCC. When the TCM commands the TCC solenoid valve OFF, the slip speed should increase.
DTC P0741

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 
  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 Freeze Frame and Failure Records. Using the Clear Info. function erases the Freeze Frame and Failure Records from the TCM.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Drive the vehicle in the D4 drive range in second, third, or fourth gear under steady acceleration, with a TP angle at 20 percent.
While the scan tool TCC Enable status is ON, does the scan tool display a TCC Slip Speed within the specified range?		 -20 to +20 RPM Go to Diagnostic Aids Go to Step 3 
3 The TCC system is hydraulically stuck OFF. Inspect for the following conditions:
  • TCC PWM solenoid valve mechanically stuck OFF or leaking.
  • TCC regulator apply valve stuck in the OFF position.
  • TCC Sol valve stuck in the OFF position or leaking.
  • TCC enable valve stuck in the OFF position.
  • Misaligned damaged or leaking valve body gasket.
  • Inspect the forward clutch input housing assembly for the input shaft fluid seal ring leaking or worn.

Did you find and correct any of the above conditions?		 - Go to Step 4  -
4 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Drive the vehicle in D4 with the TCC ON and the throttle above 10 percent. Ensure that the scan tool TCC Slip Speed is -25 to +25 RPM for 2.8 seconds.
  4. Select Specific DTC.
  5. Enter DTC P0741.

Has the test run and passed?		 - Go to Step 5  Go to Step 2 
5 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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