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Test TC-35A: No Vehicle Speed Sensor Signal

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For component location and wiring diagram, see WIRING DIAGRAMS article.
WARNING: Keep hands and feet clear of rotating wheels.
  1. On TJ, XJ and ZJ bodies, go to step 3)  . On AN, BE/BR and DN bodies, go to next step. On AB body, use scan tool to read DTCs. If DTC SPECIFIC GOOD TRIPS counter is not displayed or displayed count is not "0", perform TEST TC-35B: NO VEHICLE SPEED SENSOR SIGNAL . If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed count is "0", indicating DTC still exists, go to next step.
  2. Using scan tool, read Controller Anti-lock Brakes (CAB) DTCs. If any CAB DTCs exist, see appropriate ANTI-LOCK article in BRAKES in appropriate lemon-25® manual. If no CAB DTCs exist, go to step 20)  .
    WARNING: Keep hands and feet clear of rotating wheels.
  3. Raise and support vehicle so drive wheels are free to rotate. Start engine. Using scan tool, read Vehicle Speed Sensor (VSS) signal. Place transmission in any forward gear. If scan tool displays zero MPH, go to step 6)  . If scan tool displays more than zero MPH, go to next step.
  4. Condition required to set DTC is not present at this time. NO VEHICLE SPEED SENSOR SIGNAL DTC sets if no VSS signal is received at Powertrain Control Module (PCM) for more than 15 seconds. Possible causes are: open or shorted VSS wiring, defective connections, defective speedometer drive gear, defective VSS or PCM. Go to next step.
  5. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If wiring and connectors are okay, see INACTIVE DTC CONDITION . VSS tests okay at this time. Perform TEST VER-2A: ROAD TEST VERIFICATION .
  6. With wheels still rotating, monitor speedometer. If speedometer displays more than zero MPH, perform TEST TC-35B: NO VEHICLE SPEED SENSOR SIGNAL . If speedometer displays zero MPH, go to next step.
  7. Ensure VSS is properly installed. Correct VSS installation as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If VSS is properly installed, go to next step.
  8. Turn ignition off. Disconnect VSS connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If connector and terminals are okay, go to next step.
  9. Turn ignition on. Using scan tool in voltmeter mode, check voltage on VSS connector, 5-volt supply circuit (Orange wire). If voltage is 4 volts or less, repair open 5-volt supply circuit and perform TEST VER-2A: ROAD TEST VERIFICATION . If voltage is more than 4 volts, go to next step.
  10. Connect a jumper wire to VSS connector, signal circuit (White/Orange wire). Using scan tool, read VSS signal. Momentarily touch other end of jumper wire to VSS connector, ground circuit (Black/Light Blue wire) while monitoring VSS signal. If scan tool displays zero MPH, go to step 12)  . If scan tool displays more than zero MPH, go to next step.
  11. Remove VSS. Inspect speedometer pinion gear for damage. Repair pinion gear as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If pinion gear is okay, replace VSS and perform TEST VER-2A: ROAD TEST VERIFICATION .
  12. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If connectors and terminals are okay, go to next step.
  13. Using scan tool in ohmmeter mode, check resistance of signal circuit (White/Orange wire) between VSS connector and PCM White connector. If resistance is 5 ohms or more, repair open signal circuit and perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is less than 5 ohms, go to next step.
  14. Check resistance between ground and PCM White connector, signal circuit (White/Orange wire). If resistance is less than 5 ohms, go to step 17)  . If resistance is 5 ohms or more, go to next step.
  15. Check resistance of sensor ground circuit (Black/Light Blue wire) between VSS connector and PCM Black connector. If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is less than 5 ohms, go to next step.
  16. Check resistance between ground and VSS connector, sensor ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair sensor ground circuit for short to ground and perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A: ROAD TEST VERIFICATION .
  17. If vehicle is not equipped with Daytime Running Lamps (DRL), repair short to ground in signal circuit (White/Orange wire) and perform TEST VER-2A: ROAD TEST VERIFICATION . If vehicle is equipped with DRL, go to next step.
  18. Disconnect DRL module connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If connector and terminals are okay, go to next step.
  19. Check resistance between ground and PCM White connector, signal circuit (White/Orange wire). If resistance is less than 5 ohms, repair short to ground in signal circuit and perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is 5 ohms or more, replace DRL module and perform TEST VER-2A: ROAD TEST VERIFICATION .
  20. Turn ignition off. Disconnect CAB module and PCM connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES  on AB body, or TEST VER-2A: ROAD TEST VERIFICATION  on all other bodies. If connectors and terminals are okay, go to next step.
  21. On AB body, go to step 24)  . On AN, BE/BR and DN bodies, use an external ohmmeter to check resistance of VSS signal circuit (White/Orange wire on BE/BR bodies; White/Black wire on AN and DN bodies) between CAB module and PCM. If resistance is more than 5 ohms, repair open signal circuit and perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is 5 ohms or less, go to next step.
  22. Check resistance between ground an VSS signal circuit (White/Orange wire on BE/BR bodies; White/Black wire on AN and DN bodies). If resistance is less than 5 ohms, repair VSS signal circuit for short to ground and perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is 5 ohms or more, go to next step.
  23. Reconnect CAB module. Check resistance between ground and VSS signal circuit (White/Orange wire on BE/BR bodies; White/Black wire on AN and DN bodies). If resistance is less than 5 ohms, replace CAB module and perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A: ROAD TEST VERIFICATION .
  24. Disconnect CAB module connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If connector and terminals are okay, go to next step.
  25. Connect a jumper wire to VSS wire. Quickly tap other end of jumper wire to ground while monitoring scan tool VSS display. If scan tool displays any MPH, replace CAB module and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If scan tool displays zero MPH, go to next step.
  26. Using an external voltmeter, check VSS signal circuit (White/Orange wire) between ground and CAB module. If voltage is more than 6 volts, repair signal circuit for short to voltage and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If voltage is 6 volts or less, go to next step.
  27. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If connectors and terminals are okay, go to next step.
  28. Using an external ohmmeter, check resistance of VSS signal circuit (White/Orange wire) between CAB module and PCM. If resistance is more than 5 ohms, repair open signal circuit and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If resistance is 5 ohms or less, go to next step.
  29. Check resistance between ground an VSS signal circuit (White/Orange wire). If resistance is less than 5 ohms, repair VSS signal circuit for short to ground and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If resistance is 5 ohms or more, replace PCM and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES .
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