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Test FC-7A - No Vehicle Speed Sensor Signal (DTC 15)

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
WARNING: Keep hands and feet clear of rotating wheels.
  1. Raise and support vehicle under lower control arms, allowing wheels to spin free. Start engine. Using DRB-II, read vehicle speed sensor MPH. Place transmission in any forward gear. If DRB-II does not display 0 MPH, go to step 4). If DRB-II displays 0 MPH, go to next step.
  2. At this time, the condition required to set fault is not present. VEHICLE SPEED SENSOR SIGNAL fault sets when Powertrain Control Module (PCM) does not see a speed signal on PCM terminal No. 47, speed sensor signal wire (White/Orange wire), under road load conditions. Possible causes are: open or shorted signal wire, no signal from Transmission Control Module (TCM), failed Daytime Running Light (DRL) module, failed PCM, or failed TCM.
  3. Inspect wiring and connectors. Repair wiring and connectors as required. Perform TEST VER-2. If wiring and connectors are okay, see INACTIVE FAULT CONDITION . Perform TEST VER-2.
  4. If DRB-II did not display 0 MPH in step 1), use DRB-II to read electronic automatic transmission faults. If any of the electronic automatic transmission faults (faults 50-58) are present, repair electronic automatic transmission as necessary.
  5. If no electronic automatic transmission faults are present, turn ignition off. Disconnect TCM connector. Turn ignition on. Place DRB-II in volt-meter mode. Using DRB-II, check voltage of TCM connector terminal No. 58, speed sensor signal wire (White/Orange wire).
  6. If voltage is more than 4 volts, go to step 10). If voltage is less than 4 volts, turn ignition off. Disconnect PCM connector. If vehicle is equipped with DRL, go to TEST FC-7B. If vehicle is not equipped with DRL, go to next step.
  7. Using an external ohmmeter, check resistance of speed sensor signal wire (White/Orange wire) between PCM connector terminal No. 47 and TCM connector terminal No. 58.
  8. If resistance is more than 5 ohms, repair open speed sensor signal wire. Perform TEST VER-2. If resistance is less than 5 ohms, place DRB-II in ohmmeter mode. Using DRB-II, check resistance of PCM connector terminal No. 47, speed sensor signal wire (White/Orange wire).
  9. If resistance is less than 5 ohms, repair speed sensor signal wire for short to ground. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.
  10. If voltage was more than 4 volts in step 6), read vehicle speed MPH using DRB-II. Connect one end of a jumper wire to TCM connector terminal No. 58, speed sensor signal wire (White/Orange wire).
  11. While observing DRB-II vehicle speed MPH display, connect other end of jumper wire to ground. If DRB-II displays vehicle speed more than 0 MPH, replace TCM. Perform TEST VER-2. If DRB-II displays vehicle speed less than 0 MPH, turn ignition off.
  12. Disconnect PCM connector. Using an external ohmmeter, check resistance of speed sensor signal wire (White/Orange wire) between PCM connector terminal No. 47 and TCM connector terminal No. 58.
  13. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair speed sensor signal wire for an open. Perform TEST VER-2.
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