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Home › Plymouth › 1992 › Sundance Base, 2D Hatchback, 2.2 D, Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes - 3.0L › Fault Code Tests › Test FC-7C - No Vehicle Speed Sensor Signal

Test FC-7C - No Vehicle Speed Sensor Signal

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Turn ignition off. Disconnect vehicle speed sensor connector. Inspect terminals. Repair as required. Perform VERIFICATION PROCEDURE VER-2. If terminals are okay, turn ignition on. Put DRB-II in voltmeter mode.
  2. Using DRB-II, check voltage at vehicle speed sensor connector, 8-volt power supply circuit (Orange wire). If voltage is less than 7 volts, repair open in Orange wire. Perform VERIFICATION PROCEDURE VER-2. If voltage is more than 7 volts, go to next step.
  3. Using DRB-II, check voltage at vehicle speed sensor connector, speed sensor signal circuit (White/Orange wire). If voltage is less than 4 volts, go to TEST FC-7D. If voltage is more than 4 volts, go to next step.
  4. Connect one end of a jumper wire to vehicle speed sensor connector, speed sensor signal circuit (White/Orange wire).
  5. Using DRB-II, read car speed. While observing DRB-II car speed display, connect other end of jumper wire to vehicle speed sensor connector, sensor ground circuit (Black/Light Blue wire).
  6. If DRB-II displays more than 0 MPH, replace vehicle speed sensor. Perform VERIFICATION PROCEDURE VER-2. If DRB-II displays 0 MPH or less, turn ignition off. Place DRB-II in ohmmeter mode. Using DRB-II, check resistance at vehicle speed sensor connector, sensor ground circuit (Black/Light Blue wire).
  7. If resistance is more than 5 ohms, repair Black/Light Blue wire for an open to harness splice. Perform VERIFICATION PROCEDURE VER-2. If resistance is less than 5 ohms, turn ignition off.
  8. Disconnect Powertrain Control Module (PCM) connector. Inspect connector. Repair it as required. Perform VERIFICATION PROCEDURE VER-2. If connector is okay, go to next step.
  9. Using an external ohmmeter, check resistance of vehicle speed sensor signal circuit (White/Orange wire) between PCM connector terminal No. 47 and vehicle speed sensor connector.
  10. If resistance is more than 5 ohms, repair open White/Orange wire. Perform VERIFICATION PROCEDURE VER-2. If it is less than 5 ohms, replace PCM. Perform VERIFICATION PROCEDURE VER-2.
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