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Test Description

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 7:  This step checks the VSS sensor for a battery positive supply.
  2. 8:  This step checks the VSS sensor for a ground supply.
  3. 9:  This step checks for a shorted to ground speedometer vehicle speed input circuit.
  4. 10:  This step checks the VSS for an output signal.
  5. 11:  This step checks the PCM vehicle speed input circuit for continuity to the speedometer.
  6. 12:  This step checks the speedometer for an output signal. Each 1 Hz of frequency is approximately equal to one mile per hour.
DTC P0500

Step Action Values Yes No
Schematic Reference Automatic Transmission Controls Schematics 
1 Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? - Go to Step 2  Go to Diagnostic System Check - Engine Controls in Engine Controls
2
  1. Raise the drive wheels.
  2. Support the lower control arms so that the drive axles are in a horizontal position.
  3. Start and idle the engine.
  4. Observe the vehicle speed parameter on the scan tool.
  5. Allow the engine to idle in gear with the drive wheels rotating.
Does the scan tool parameter indicate a vehicle speed?		 - Go to Step 3  Go to Step 4 
3
  1. Using the scan tool, store the DTC Freeze Frame information.
  2. Perform the scan tool Clear DTC Information function.
  3. Place the vehicle into Check mode using the scan tool.
  4. Operate the vehicle within the Freeze Frame conditions.
Does DTC P0500 set?		 - Go to Step 4  Go to Diagnostic Aids
4
  1. Raise the drive wheels.
  2. Support the lower control arms so that the drive axles are in a horizontal position.
  3. Start and idle the engine.
  4. Observe the speedometer.
  5. Allow the engine to idle in gear with the drive wheels rotating.
Does the speedometer indicate a vehicle speed?		 - Go to Step 11  Go to Step 5 
5 Do all other instrument cluster assembly functions operate normally? - Go to Step 6  Go to Diagnostic Starting Point - Instrument Panel, Gages and Console in Instrument Panel, Gages, and Console
6 Is vehicle equipped with ABS? - Go to Step 9  Go to Step 7 
7 
  1. Turn OFF the ignition.
  2. Disconnect the VSS electrical connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the VSS connector terminal 1 on the harness side with a test lamp connected to ground.
Does the test lamp illuminate?		 - Go to Step 8  Go to Step 13 
8  Probe the VSS connector terminal 2 on the harness side with a test lamp connected to B+.
Does the test lamp illuminate?		 - Go to Step 9  Go to Step 14 
9  Check the VSS signal circuit between the IPC and the VSS or BPMV.
Does continuity exist?		 - Go to Step 15  Go to Step 10 
10 
  1. Reconnect the VSS connector.
  2. Disconnect the instrument panel cluster (IPC) connector.
  3. Set-up the digital multimeter (DMM) to measure the DC frequency (push the Hz button) on the speedometer vehicle speed input circuit terminal 18.
  4. Start and idle the engine.
  5. Allow the engine to idle in gear with the drive wheels rotating.
Does the DMM indicate a frequency?		 - Go to Step 19  Go to Step 16 
11 
  1. Turn OFF the ignition.
  2. Disconnect PCM electrical connector C3, containing the vehicle speed input terminal 17.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the vehicle speed input circuit terminal on the harness side with the DMM connected to ground.
  5. Measure the DC voltage on the vehicle speed input circuit.
Is the voltage within the specified value?		 9-12 V Go to Step 12  Go to Step 17 
12 
  1. Set-up the DMM to measure the DC frequency - push the Hz button on the PCM vehicle speed input circuit.
  2. Start and idle the engine.
  3. Allow the engine to idle in gear with the drive wheels rotating.
Does the DMM indicate a frequency?		 - Go to Step 21  Go to Step 18 
13 Repair the cause of no power to the VSS connector. Refer to Wiring Repairs in Wiring Systems.
Is the action complete?		 - Go to Step 22  -
14 Repair the cause of no ground to the VSS connector. Refer to Wiring Repairs in Wiring Systems.
Is the action complete?		 - Go to Step 22  -
15
  1. Check the speedometer vehicle speed input circuit for a short to ground.
  2. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Was a repair necessary?		 - Go to Step 22  Go to Step 19 
16
  1. Check the speedometer vehicle speed input circuit for an open.
  2. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Was a repair necessary?		 - Go to Step 22  Go to Step 20 
17
  1. Check the PCM vehicle speed input circuit for a short to ground or open.

    If equipped, ensure that the cruise control module is not shorted internally.

  2. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Was a repair necessary?		 - Go to Step 22  Go to Step 19 
18
  1. Check the PCM vehicle speed input circuit for a short to battery positive.
  2. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Was a repair necessary?		 - Go to Step 22  Go to Step 19 
19 Replace the speedometer. Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gages, and Console.
Is the replacement complete?		 - Go to Step 22  -
20 Replace the VSS. Refer to Vehicle Speed Sensor (VSS) Replacement .
Is the replacement complete?		 - Go to Step 22  -
21 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls.
Is the replacement complete?		 - Go to Step 22  -
22
  1. Perform the scan tool Clear DTC Information function and road test the vehicle with the Freeze Frame conditions that set the DTC.
  2. Review the scan tool data and check for DTCs. The repair is complete if no DTCs are stored.
Are any DTCs displayed on the scan tool?		 - Go to Diagnostic Trouble Code (DTC) List/Type  System OK
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