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DTC P0502 Vehicle Speed Sensor No Signal (Engine Side): Troubleshooting

TROUBLESHOOTING CHART

Step Action Value(s) Yes No
1 Perform an On-Board Diagnostic (OBD II) System Check.
Was the check performed?		 - Go to Step 2 Go to "ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK :"
2 Running the vehicle in gear with the wheels hanging down at full travel will damage the drive axles.
  1. Install a scan tool to the Data Link Connector (DLC).
  2. Raise the drive wheels.
  3. Support the lower control arms so that the drive axles are in a horizontal (straight) position.
  4. Start the engine and allow to idle in gear.

Does the scan tool display vehicle speed above the specific value?		 0 mph Go to Step 3 Go to Step 4
3
  1. Turn the ignition ON.
  2. Review the Freeze Frame data and note the parameters.
  3. Operate the vehicle within the Freeze Frame conditions and Conditions for Setting this DTC.

Does the scan tool display vehicle speed above the specific value?		 0 mph Go to Step 12 Go to Step 4
4
  1. Turn the ignition OFF.
  2. Disconnect the Vehicle Speed Sensor (VSS) connector.
  3. Turn the ignition ON.
  4. Using a voltmeter connected to ground, measure the voltage in VSS signal circuit, at terminal B.

Is the voltage near the specified value?		 10.1V Go to Step 5 Go to Step 7
5 Using a voltmeter connected to ground, measure the voltage at terminal C of the VSS connector.
Is the voltage near the specified value?		 11-14 V Go to Step 6 Go to Step 8
6 Using a ohmmeter connected to ground, measure the resistance at terminal A of the VSS connector.
Is the resistance near the specified value?		 400 Ω. Go to Step 10 Go to Step 9
7 Check the VSS signal circuit for an open or short to ground and repair as needed.
Is the repair complete?		 - Go to Step 12 Go to Step 11
8 Check the ignition circuit for an open and repair as needed.
Is the repair complete?		 - Go to Step 12 -
9 Check the VSS ground circuit for an open and repair as needed.
Is the repair complete?		 - Go to Step 12 -
10
  1. Turn the ignition OFF.
  2. Replace the VSS.

Is the repair complete?		 - Go to Step 12 -
11
  1. Turn the ignition OFF.
  2. Replace the ECM.

Is the repair complete?		 - Go to Step 12 -
12
  1. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  2. Start the engine and idle at normal operating temperature.
  3. Operate the vehicle within the conditions for setting this DTC as specified in the supporting text

Does the scan tool indicate that this diagnostic has run and passed?		 - Go to Step 13 Go to Step 2
13 Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?		 - Go to APPLICABLE DTC TABLE  System OK
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