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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 938 (Automatic Transmission - ALLISON - DTC P0733 To DTC P0873) >> DTC P0734 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. 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:  This step tests ignition voltage.
  2. 5:  This step tests for turbine speed not remaining at zero in 4th range.
DTC P0734

Step Action Value Yes No
Schematic Reference: Automatic Transmission Controls Schematics
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Measure the transmission fluid level. Refer to Transmission Fluid Check .
Is the transmission fluid level correct?		 - Go to Step 3  Go to Transmission Fluid Check
3 
  1. Install the 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 for reference. The Clear Info function will erase the data.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Using the scan tool, measure ignition voltage.
Is the voltage within the specified range?		 9-18 V Go to Step 4  Go to DTC P0562 for low voltage or DTC P0563 for high voltage
4
  1. Drive the vehicle under normal operating conditions.
  2. Using the scan tool, monitor engine, turbine and output speed readings.
Is speed sensor data erratic?		 - Go to the appropriate speed sensor DTC Go to Step 5 
5 
NOTE: Refer to Transmission Stall Test Notice .
Conduct a clutch test for 4th range. Refer to Clutch Test .Did turbine speed remain at zero?		 - Go to Diagnostic Aids Go to Step 6 
6
  1. Remove the transmission oil pan. Refer to Automatic Transmission Fluid and Filter Replacement .
  2. Inspect for contaminated fluid and excessive material in the pan.
Is fluid contaminated or excessive material found in the pan?		 - Go to Step 7  Go to Step 8 
7 Remove the transmission for overhaul or replacement. Refer to Transmission Replacement .
Did you complete the replacement?		 - Go to Step 10  -
8 Inspect for a stuck or sticking pressure control valve. Refer to Control Valve Body Cleaning and Inspection .
Did you find and correct a condition?		 - Go to Step 10  Go to Step 9 
9 Replace pressure control solenoid 2 (PCS2). Refer to Control Valve Solenoid Replacement (PCS1 and PCS2) or Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) .
Did you complete the replacement?		 - Go to Step 10  -
10 Perform the following procedure in order to verify the repair:
  1. Clear the DTC.
  2. Start the engine.
  3. Using the scan tool, operate the vehicle under normal operating conditions.
  4. Select Specific DTC.
  5. Enter DTC P0734.

Has the test run and passed?		 - Go to Step 11  Go to Step 2 
11 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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