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Home >> Eagle >> 1995 >> Vision ESi >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.3L >> Test TC-27A >> No Vehicle Speed Sensor Signal (DTC 15)
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No Vehicle Speed Sensor Signal (DTC 15)

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 3.3L article in ENGINE PERFORMANCE. After each repair, perform TEST VER-2  .
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 scan tool, read Vehicle Speed Sensor (VSS) MPH. Place transmission in any forward gear. If scan tool does not display more than 0 MPH, go to step 4). If scan tool displays more than 0 MPH, go to next step.
  2. At this time, the condition required to set trouble code is not present. VEHICLE SPEED SENSOR (VSS) SIGNAL trouble code sets when Powertrain Control Module (PCM) does not see a speed signal under road load conditions. Possible causes are: open or shorted VSS wire, no VSS from Transmission Control Module (TCM), faulty TCM output speed circuit, failed PCM, or failed TCM.
  3. Inspect wiring and connectors. Repair wiring and connectors as required. If wiring and connectors are okay, see INACTIVE TROUBLE CODE CONDITION  S. Test is complete.
  4. If scan tool does not display more than 0 MPH in step 1), use scan tool to read Electronic Automatic Transmission (EATX) trouble codes. If any EATX trouble codes (Trouble Codes 50-58) are present, see the TRANSMISSION SERVICING article. If no EATX trouble codes are present, go to next step.
  5. Turn ignition off. Disconnect Transmission Control Module (TCM) connector. TCM is located in engine compartment between left front fender and battery. Turn ignition on. Using scan tool in voltmeter mode, check voltage on TCM connector terminal No. 58 (White/Orange wire). If voltage is more than 4 volts, go to step 9). If voltage is less than 4 volts, go to next step.
  6. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. PCM is located under air cleaner. If vehicle is equipped with Speed Proportional Steering (SPS), go to TEST TC-27B  . If vehicle is not equipped with SPS, go to next step.
  7. Using an external ohmmeter, check resistance of White/Orange wire between PCM connector terminal No. 47 and TCM connector terminal No. 58. If resistance is more than 5 ohms, repair open White/Orange wire. If resistance is less than 5 ohms, go to next step.
  8. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 47 (White/Orange wire). If resistance is less than 5 ohms, repair short to ground in White/Orange wire. If resistance is more than 5 ohms, replace PCM.
  9. If voltage is more than 4 volts in step 6), read Vehicle Speed Sensor (VSS) MPH using scan tool. Connect one end of a jumper wire to TCM connector terminal No. 58 (White/Orange wire). While observing scan tool display, connect other end of jumper wire to chassis ground. If scan tool displays vehicle speed more than 0 MPH, replace TCM. If scan tool does not display vehicle speed more than 0 MPH, go to next step.
  10. Turn ignition off. Disconnect PCM connector. Using an external ohmmeter, check resistance of White/Orange wire between PCM connector terminal No. 47 and TCM connector terminal No. 58. If resistance is less than 5 ohms, replace PCM. If resistance is more than 5 ohms, repair open White/Orange wire.
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