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Test TC-35B - No Vehicle Speed Sensor Signal

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  Directory. For wiring diagram, see appropriate WIRING DIAGRAMS - NON-TURBO article.
  1. Turn ignition off. Disconnect 3-pin VSS connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on VSS connector 8-volt power supply circuit (Yellow wire). If voltage more than 7 volts, go to next step. If voltage 7 volts or less, repair open 8-volt power supply circuit. Perform TEST VER-2A.
  2. Using scan tool, check voltage on VSS connector signal circuit Yellow/White wire. If voltage is more than 4 volts, go to next step. If voltage is 4 volts or less, go to step 5).
  3. Connect a jumper wire to VSS connector ground circuit Black/Dark Green wire. Using scan tool, read VSS signal. While observing scan tool, tap other end of jumper wire to VSS connector signal circuit (Yellow/White wire). If scan tool displays more than zero MPH, go to next step. If scan tool does not display more than zero MPH, go to TEST TC-35C.
  4. Remove VSS sensor from transmission. Inspect speedometer pinion gear. If speedometer pinion gear is okay, replace VSS. Perform TEST VER-2A. If speedometer pinion gear is not okay, repair or replace as necessary. Perform TEST VER-2A.
  5. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of VSS signal circuit between VSS connector and PCM connector terminal No. 66 (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.
  6. Using scan tool in ohmmeter mode, check VSS signal circuit at PCM connector terminal 66 (Yellow/White wire). If resistance 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.
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