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Test TC-35A - No Vehicle Speed Sensor Signal

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  Directory. For wiring diagram, see WIRING DIAGRAMS article.
WARNING: Keep hands and feet clear of rotating wheels.
  1. Raise and support vehicle under lower control arms, allowing drive wheels to spin free. Start engine. Using scan tool, read Vehicle Speed Sensor (VSS). Put transmission in any forward gear. If scan tool displays more than zero MPH, go to next step. If scan tool does not display more than zero MPH, go to step 4).
  2. Condition to set trouble code is not present at this time. NO VEHICLE SPEED SENSOR SIGNAL DTC sets if no signal from Vehicle Speed Sensor (VSS) signal is present from Transmission Control Module (TCM) for more than 11 seconds. Possible causes are: open or shorted signal circuit, speedometer pinion factor not programmed, output speed sensor circuit problem, failed Powertrain Control Module (PCM) or failed TCM. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, see INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-2A. If related wiring and connectors were repaired, perform TEST VER-2A.
  4. If vehicle is equipped with a 4-speed automatic transmission, go to next step. If vehicle is not equipped with a 4-speed automatic transmission, go to TEST TC-35B.
  5. Using scan tool, read transmission trouble codes. If transmission Diagnostic Trouble Codes (DTCs) 50-58 are present or pinion factor is not programmed, repair transmission as required. See appropriate TRANSMISSION SERVICE & REPAIR article. If transmission Diagnostic Trouble Codes (DTCs) 50-58 are not present or pinion factor is programmed, go to next step.
  6. Turn ignition off. Disconnect Transmission Control Module (TCM) connector. Connect one end of a jumper wire to TCM connector terminal No. 18 (Yellow/White wire). Turn ignition on. Using scan tool, read VSS signal. While observing scan tool display, tap other end of jumper wire to ground. If scan tool displays more than zero MPH, go to step 9). If scan tool does not display more than zero MPH, go to next step.
  7. Turn ignition off. Disconnect PCM connector. Using an external ohmmeter, check resistance of VSS signal circuit between PCM connector terminal No. 66 (Yellow/White wire) and TCM connector terminal No. 18 (Yellow/White wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open VSS signal circuit. Perform TEST VER-2A.
  8. Using scan tool in ohmmeter mode, check resistance of VSS signal circuit at PCM connector terminal No. 58 (Yellow/White wire). If resistance is less than 5 ohms, repair short to ground in VSS signal circuit. Perform TEST VER-2A. If resistance is 5 ohms or more, replace PCM. Perform TEST VER-2A.
  9. Using scan tool in ohmmeter mode, check resistance of TCM connector terminal No. 54 (White/Yellow wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step 11).
  10. Disconnect 2-pin transmission output speed sensor connector. See Fig. 35. Using scan tool in ohmmeter mode, check resistance of TCM connector terminal No. 54 (White/Yellow wire). If resistance is less than 5 ohms, repair short to ground on (White/Yellow wire). Perform TEST VER-2A. If resistance is 5 ohms or more, replace output speed sensor. Perform TEST VER-2A.
    Fig 1: Transmission Output Speed Sensor Connector
    G95G12670
  11. With 2-pin transmission output speed sensor connector connected, using an external ohmmeter, check resistance of transmission output speed sensor ground circuit (Gray/Dark Blue wire) at 2-pin transmission output speed sensor connector. If resistance is not 300-1200 ohms, go to next step. If resistance is 300-1200 ohms, replace TCM. Reprogram pinion factor and perform quick learn procedure. Perform TEST VER-2A.
  12. Disconnect 2-pin transmission output speed sensor connector. Using an external ohmmeter, check resistance of output speed sensor signal circuit (White/Yellow wire) between TCM connector terminal No. 54 and 2-pin transmission output speed sensor connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open output speed sensor signal circuit. Perform TEST VER-2A.
  13. Using an external ohmmeter, check resistance of output speed sensor ground circuit (Gray/Dark Blue wire) between TCM connector terminal No. 53 and 2-pin transmission output speed sensor connector. If resistance less than 5 ohms, replace transmission output speed sensor. Perform TEST VER-2A. If resistance 5 ohms or more, repair open output speed sensor ground circuit. Perform TEST VER-2A.
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