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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 633 (Automatic Transaxle Diagnostics (DTC P0741 (3.6L) To DTC P1819 (3.4L) - 4T65-E) >> Diagnosis >> DTC P0751 (3.4L) >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3:  This step confirms that the PCM commanded all the shifts, but all the shifts did not occur.
DTC P0751 (3.4L)

Step Action Value(s) Yes No
1 Did you perform the Diagnostic System Check - Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls in Engine Controls - 3.4L
2 Did you perform the Transmission 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 DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. Using the Clear DTC Information function will erase the stored Freeze Frame and Failure Records from the PCM.
  3. Record the Freeze Frame and Failure Records.
  4. Clear the DTCs.
  5. Accelerate the vehicle in D4 range, ensuring that the PCM commands 1st, 2nd, 3rd and 4th gears.
  6. With the scan tool, observe Commanded Gear and Gear Ratio for each gear.
Did the gear ratios indicate a 2-2-3-3 shift pattern?		 1st: 2.87:1 to 2.97:1
2nd: 1.52:1 to 1.62:1
3rd: 0.95:1 to 1.05:1
4th: 0.65:1 to 0.75:1		 Go to Step 4  Go to Diagnostic Aids
4 Inspect the 1-2 shift solenoid valve/hydraulic circuit for the following conditions:
  • The 1-2 shift solenoid mechanically stuck OFF
  • A stuck or binding 1-2 shift valve
  • Damaged seals on the shift solenoid valve

Refer to:
Did you find and correct the condition?		 - Go to Step 5  -
5 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear DTC Information.
  3. Operate the vehicle under the following conditions:
    • Drive the vehicle in D4.
    • The transmission fluid temperature is 20-130°C (68-266°F).
    • TP angle must be 10 percent or greater.
    • The engine torque is 27-270 N.m (20-200 lb ft).
    • Ensure that the gear ratios are as specified for 1st and 4th gear.
  4. Select Specific DTC.
  5. Enter DTC P0751.

Has the test run and passed?		 1st: 2.87:1 to 2.97:1
2nd: 1.52:1 to 1.62:1
3rd: 0.95:1 to 1.05:1
4th: 0.65:1 to 0.75:1		 Go to Step 6  Go to Step 2 
6 With a 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 - 3.4L System OK
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