LEMON Manuals: Even more car manuals for everyone
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 P0723 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. 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. 2:  Disable the traction control system when performing this step. When the ignition switch is cycled OFF and then back ON, the traction control system defaults to ON.
  2. 3:  This step tests the VSS.
  3. 5:  This step tests the integrity of the VSS.
DTC P0723

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 Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Raise and support the rear axle assembly.
  6. Start the engine.
  7. Disable the traction control system.
  8. Place the transmission in D3 range.
  9. With the drive wheels rotating, slowly accelerate to 2,000 RPM and hold, road test the vehicle if necessary.
Does the scan tool Transmission OSS parameter drop or fluctuate more than the specified value?		 1,300 RPM Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections
3 
  1. Turn OFF the ignition.
  2. Disconnect the engine wiring harness from the VSS.
  3. Using the DMM and the J 35616  GM Terminal Test Kit, measure the resistance of the VSS.
Does the resistance measure within the specified range?		 976-2354 Ω Go to Step 4  Go to Step 13 
4 Measure the resistance from the high signal circuit of the VSS to ground.
Refer to Testing for Continuity .
Does the resistance measure greater than the specified value?		 50 K Ω Go to Step 5  Go to Step 13 
5 
  1. Place the transmission in NEUTRAL.
  2. Select AC volts on the DMM.
  3. Hold one rear wheel from turning.
  4. Rotate the other wheel by hand.
  5. Measure the AC voltage from high signal and low signal circuits of the VSS assembly.
Refer to Measuring Voltage .Does the voltage measure greater than the specified value?		 0.3 V Go to Step 6  Go to Step 13 
6
  1. Connect the engine wiring harness to the VSS.
  2. Disconnect the TCM.
  3. Measure the resistance of the VSS high signal and VSS low signal circuits at the TCM connector.
Refer to Testing for Continuity .Does the resistance measure within the specified range?		 976-2354 Ω Go to Step 7  Go to Step 8 
7 Measure the resistance from the high signal and low signal circuits of the VSS to ground.
Refer to Testing for Continuity .
Does the resistance measure greater than the specified range?		 50 K Ω Go to Step 9  Go to Step 10 
8 Does the resistance measure greater than the specified value? 2354 Ω Go to Step 11  Go to Step 12 
9
  1. Connect the TCM.
  2. Disconnect the engine wiring harness from the VSS.
  3. Turn ON the ignition, with the engine OFF.
  4. Test the high signal circuit of the VSS for a short to voltage.
  5. Test the low signal circuit of the VSS for a short to voltage.

    Refer to Testing for a Short to Voltage 62200 and Wiring Repairs .

Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
10
  1. Test the high signal circuit of the VSS for a short to ground.
  2. Test the low signal circuit of the VSS for a short to ground.

    Refer to Testing for Short to Ground 62110 and Wiring Repairs .

Did you find and correct the condition?		 - Go to Step 15  -
11
  1. Test the high signal circuit of the VSS for an open.
  2. Test the low signal circuit of the VSS for an open.

    Refer to Testing for Continuity and Wiring Repairs .

Did you find and correct the condition?		 - Go to Step 15  -
12 Test the high signal and low signal circuits of the VSS for a short together.
Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  -
13 Replace the VSS.
Refer to Vehicle Speed Sensor Replacement .
Did you complete the replacement?		 - Go to Step 15  -
14 Replace the TCM.
Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 15  -
15 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Operate the vehicle ensuring that the transmission output speed drop is less than 250 RPM for 2 seconds and output speed is greater than 300 RPM.
  4. Select Specific DTC.
  5. Enter DTC P0723.

Has the test run and passed?		 - Go to Step 16  Go to Step 2 
16 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
scientia non olet · About LEMON Manuals