LEMON Manuals: Even more car manuals for everyone
Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P2771) >> DTC P0503 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Hummer H2. 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 the VSS circuit.
  2. 4:  This step tests the integrity of the VSS.
DTC P0503

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 PCM.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Raise and support the rear axle assembly.
  6. Start the engine.
  7. Place the transmission in D3 range.
  8. With the drive wheels rotating, slowly accelerate to 2,000 engine RPM and hold. Road test the vehicle if necessary.
Does the scan tool Transmission OSS 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 PCM.
  3. Using the DMM and the J 35616  GM Terminal Test Kit, measure the resistance between the VSS high signal and VSS low signal circuits at the PCM connector. See Special Tools .
Does the resistance measure within the specified range?		 976-2354 Ω Go to Step 4  Go to Step 7 
4 
  1. Place the transmission in NEUTRAL.
  2. Select AC volts.
  3. Prevent one rear wheel from turning.
  4. Rotate the other rear wheel by hand, ensuring that the driveshaft is turning.
Does the voltage measure greater than the specified value?		 0.5 V Go to Step 5  Go to Step 12 
5 Measure the resistance from the high signal circuit of the VSS to ground.
Does the resistance measure greater than the specified value?		 50 K Ω Go to Step 6  Go to Step 9 
6
  1. Connect the PCM.
  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. Refer to Testing for a Short to Voltage and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
7
  1. Disconnect the engine wiring harness from the VSS.
  2. Measure the resistance of the VSS.
Does the resistance measure within the specified range?		 976-2354 Ω Go to Step 8  Go to Step 13 
8 Was the resistance measured in Step 3 greater than the specified value? 2354 Ω Go to Step 10  Go to Step 11 
9 Test the high signal circuit of the VSS for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  -
10
  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  -
11 Test the high signal circuit and the low signal circuit 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  -
12
  1. Remove the VSS.
  2. Inspect the output shaft speed sensor rotor for damage or misalignment.
  3. Inspect the case extension bushing for wear.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 13 
13
IMPORTANT: For vehicles equipped with an active transfer case, identify the VSS before replacing. There are two transfer case speed sensors located near the VSS. Refer to the wire colors on the schematic to identify the VSS.
Replace the VSS. Refer to Vehicle Speed Sensor Replacement .Did you complete the replacement?		 - Go to Step 15  -
14 Replace the PCM. 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 500 RPM for 2 seconds and output speed is greater than 500 RPM for 2 seconds.
  4. Select Specific DTC. Enter DTC P0503.

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