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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1774 (Automatic Transaxle - AF33-5 (DTC P0562 - P0762)) >> Diagnostic Information & Procedures >> DTC P0744 >> 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:  Degraded or incorrect transmission fluid.
  2. 4:  A low transmission fluid condition may cause this DTC to set.
  3. 7:  A loose or damaged OSS can cause this DTC to set.
  4. 10:  A stuck or leaking shift solenoid valve 4 may cause this DTC to set.
  5. 11:  A stuck TCC lockup PC solenoid may cause this DTC to set.
DTC P0744

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 Inspect for correct transmission fluid level. Refer to Transmission Fluid Checking Procedure .
Is the transmission fluid level correct?		 - Go to Step 3  Go to Step 4 
3  Inspect the transmission fluid for the following conditions:
  • Degraded transmission fluid
  • Incorrect transmission fluid
  • Transmission oil life is less than 10%

Did you find a condition?		 - Go to Step 18  Go to Step 5 
4 
  1. Visually inspect the transmission and transmission cooling system for fluid leaks. Refer to Fluid Leak Diagnosis .
  2. Repair leaks as necessary.
  3. Fill the transmission to the proper fluid level.
Did you complete the action?		 - Go to Step 19  -
5
IMPORTANT: If any of the following DTCs are set, they must be diagnosed before attempting to diagnose DTC P0744:
  1. DTC P0722
  2. DTC P0727
  3. DTC P0733
  4. DTC P0966
  5. DTC P0967
  6. DTC P0982
Are any of the above DTCs set?		 - Go to DIAGNOSTIC TROUBLE CODE DEFINITIONS Go to Step 6 
6
  1. Install a scan tool.
  2. Turn the ignition ON, 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 DTC Failure Records.
  4. Clear the DTC.
  5. Use the scan tool snapshot mode in order to record the following parameters:
    • Commanded Gear
    • Gear Ratio
    • TCC Slip
  6. Drive the vehicle in DRIVE (D) and record the gear ratio while accelerating in 3rd gear.
Is the 3rd gear ratio equal to the specified value, and TCC slip in 3rd-5th gears?		 2.89:1 Go to INTERMITTENTS Go to Step 7 
7 
  1. Drive the vehicle.
  2. Observe Transmission OSS with a scan tool.
Is Transmission OSS reading correctly?		 - Go to Step 8  Go to Step 13 
8 Test for correct line pressure. Refer to Line Pressure Check Procedure .
Did you find and correct a low line pressure condition?		 - Go to Step 18  Go to Step 9 
9
  1. Remove the control valve body cover (29). Refer to Control Valve Body Cover Removal .
  2. Inspect the inside of the control valve body cover (29) for excessive sediment.
Did you find excessive amounts of sediment?		 - Go to Step 17  Go to Step 10 
10  Inspect the control valve body assembly (39) for the following condition:
  • Stuck open shift solenoid valve 4 assembly
  • Leaking shift solenoid valve 4 assembly

Refer to Rear Control Valve Body Disassemble and Middle Control Valve Body Disassemble .
Did you find a condition?		 - Go to Step 14  Go to Step 11 
11  Inspect the control valve body assembly (39) for a stuck TCC lockup pressure control (PC) solenoid condition.
Did you find a condition?		 - Go to Step 15  Go to Step 12 
12 Inspect for a worn or damaged torque converter condition. Refer to Torque Converter Assembly Removal
Did you find a condition?		 - Go to Step 16  Go to Diagnostic Aids
13 Replace the OSS. Refer to Output Shaft Speed Sensor Replacement
Did you complete the action?		 - Go to Step 19  -
14 Replace the shift solenoid valve 4 assembly Refer to Control Valve Body Assembly Disassemble
Did you complete the action?		 - Go to Step 19  -
15 Repair or replace the valve body. Refer to Fastener Tightening Specifications
Did you complete the action?		 - Go to Step 19  -
16 Replace the torque converter assembly. Refer to Torque Converter Assembly Removal
Is the action complete?		 - Go to Step 18  -
17 Repair or replace the transmission. Refer to Transmission Replacement .
Is the action complete?		 - Go to Step 18  -
18
  1. Replace the transmission fluid. Refer to Transmission Fluid Replacement .
  2. Inspect for the correct level of transmission fluid.
  3. Add new fluid as necessary.
    4. IMPORTANT: The Reset Trans Adapts function will clear all adapt cells. This may affect transmission performance. The TCM will update the adapt cell values as the vehicle is driven.
  4. Use the scan tool in order to perform the following:
    • Reset the transmission oil life monitor to 100 percent.
    • Reset Trans Adapts.
Did you complete the above procedures?		 - Go to Step 19  -
19 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Operate the vehicle.
  4. Select Specific DTC.
  5. Enter DTC P0744.

Does the DTC reset?		 - Go to Step 2  Go to Step 20 
20 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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