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Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Manual Transmission - TREMEC 6-Speed) >> Diagnostic Information and Procedures >> DTC P0500: Vehicle Speed Sensor (VSS) Circuit >> 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 the ability of the VSS to produce an AC voltage. This step also verifies the integrity of the wiring to the PCM.
  2. 4:  This step tests the VSS circuit for correct resistance.
DTC P0500

Step Action Value(s) Yes No
1 Did you perform the Diagnostic System Check - Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls in Engine Controls - 5.7L
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 drive wheels.
  6. Start and idle the engine.
  7. Engage the transmission in 2nd gear.
  8. Select Vehicle Speed Sensor on the scan tool.
With the drive wheels rotating, does Vehicle Speed Sensor increase when the wheel speed increases?		 - Go to Intermittent Conditions in Engine Controls - 5.7L Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the PCM connector C2.
  3. Using the J 35616  GM terminal test kit, connect the DMM between the VSS high signal circuit and the VSS low signal circuit at the PCM connector.
  4. Select AC volts on the DMM.
  5. Turn ON the ignition, with the engine OFF.
  6. Rotate the right front drive wheel by hand.
  7. Observe the DMM display.
Can a voltage greater than the specified value be obtained?		 0.5 V AC Go to Step 14  Go to Step 4 
4 
  1. Leave the DMM test leads connected.
  2. Measure circuit resistance.
Is the circuit resistance within the specified range?		 977-2,354 Ω Go to Step 8  Go to Step 5 
5 Is the circuit resistance greater than the specified value? 2,354 Ω Go to Step 11  Go to Step 6 
6
  1. Leave the DMM test leads connected.
  2. Disconnect the VSS connector at the transmission.
Is the circuit resistance less than the specified value?		 977 Ω Go to Step 7  Go to Step 13 
7 Test the high signal circuit and the low signal circuit of the VSS for being shorted together.
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  -
8 Test the high signal circuit of the VSS for a short to ground.
Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 9 
9
  1. Connect PCM connector C2.
  2. Select DC volts on the DMM.
  3. Using the J 35616  , connect the DMM test leads to the VSS high signal circuit and the VSS low signal circuit of the VSS wiring harness connector.
  4. Turn ON the ignition, with the engine OFF.
Does the DMM display system voltage?		 - Go to Step 10  Go to Step 12 
10 Test the high signal circuit of the VSS for a short to voltage.
Refer to Testing for a Short to Voltage and Wiring Repairs in Wiring Systems.
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 in Wiring Systems.Did you find and correct a condition?		 - Go to Step 15  Go to Step 13 
12
  1. Remove the VSS. Refer to Vehicle Speed Sensor (VSS) Replacement .
  2. Inspect the VSS and the transmission for the following conditions:
    • Incorrect VSS
    • VSS damage
    • Excessive VSS to speed sensor rotor gap
    • Incorrect speed sensor rotor alignment
    • Speed sensor rotor damage
  3. Repair any of the above conditions as necessary.
Did you complete the repair?		 - Go to Step 15  -
13 Replace the VSS. Refer to Vehicle Speed Sensor (VSS) Replacement .
Did you complete the replacement?		 - Go to Step 15  -
14 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 5.7L.
Is the action complete?		 - Go to Step 15  -
15 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Test drive the vehicle.
  4. Select Specific DTC.
  5. Enter DTC P0500.

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 in Engine Controls - 5.7L System OK
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