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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 30 (AUTOMATIC TRANSMISSION - ALLISON - DIAGNOSTICS (DTCs P0218-P0731)) >> DTC P0731 >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  This step tests ignition voltage.
  2. 5:  This step tests speed sensor readings.
  3. 6:  This step tests for clutch slippage in 1st range shown by turbine speed not remaining at zero.
DTC P0731

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 Checking Procedure .
Is the transmission fluid level correct?		 - Go to Step 3  Go to Transmission Fluid Checking Procedure
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. Start the engine.
  2. Using the scan tool, observe the gear ratio.
Is the correct 1st range ratio shown?		 3.10:1 Go to Step 5  Go to Diagnostic Aids
5
  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 6 
6 Refer to Transmission Stall Test Notice .
Conduct a clutch test for 1st range. Refer to Clutch Test .
Did turbine speed remain at zero?		 - Go to Diagnostic Aids Go to Step 7 
7
  1. Remove the transmission oil pan. Refer to Automatic Transmission Fluid/Filter Replacement .
  2. Inspect for contaminated fluid and excessive material in the pan.
Is the fluid contaminated or excessive material found in the pan?		 - Go to Step 8  Go to Step 9 
8 Remove the transmission for overhaul or replacement. Refer to Transmission Replacement (With 6.6L Engine) or Transmission Replacement (With 8.1L (L18) Engine) .
Did you complete the replacement?		 - Go to Step 11  -
9 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 11  Go to Step 10 
10 Replace pressure control solenoid 3 (PCS3). 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 11  -
11 Perform the following procedure in order to verify the repair:
  1. Clear the DTC.
  2. Start the engine.
  3. Using the scan tool, monitor 1st gear ratio and operate vehicle under normal operating conditions.
  4. Select Specific DTC.
  5. Enter DTC P0731.

Has the test run and passed?		 - Go to Step 12  Go to Step 2 
12 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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