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Vehicle Speed Sensor (VSS) Test: 3.5RL

  1. Ensure fuse No. 13 (7.5-amp) located in under-dash fuse/relay box is okay. If fuse is okay, locate Vehicle Speed Sensor (VSS) next to engine oil filter. Turn ignition switch to OFF position. Disconnect VSS 3-pin connector. Connect Test Harness (07LAJ-PT30200A) to VSS harness connector only.
  2. Using DVOM, check voltage between White test harness clip and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Yellow wire between VSS and fuse/relay box under instrument panel.
  3. Using DVOM, check voltage between Green test harness clip and ground. Turn ignition switch to ON position. If 5 volts or more exists, go to next step. If 5 volts or more does not exist, repair open in Blue/White wire between VSS, PCM, cruise control unit, steering column control unit, driver's multiplex control unit, and navigation control unit. See WIRING DIAGRAMS .
  4. Turn ignition switch to OFF position. Disconnect test harness. Locate Powertrain Control Module (PCM) under right side of instrument panel. Disconnect PCM Gray 22-pin "D" connector. Using a DVOM, check for continuity between PCM 22-pin connector terminal No. 22 and VSS 3-pin connector terminal No. 1 (Green/Blue wire). If continuity exists, go to next step. If continuity does not exist, repair open in Green/Blue wire between VSS and PCM.
  5. Turn ignition switch to OFF position. Using a DVOM, backprobe between VSS connector terminal No. 3 (Blue/White wire) and terminal No. 1 (Green/Blue wire). Raise and support front of vehicle. Place transmission in Neutral. Turn ignition switch to ON position. Block one front wheel, slowly rotate opposite wheel and measure voltage. If voltage pulses from zero volts to about 5 volts or more, go to next step. If voltage does not pulse as specified, replace VSS. See VEHICLE SPEED SENSOR (VSS)  under REMOVAL & INSTALLATION.
  6. Disconnect instrument cluster Green 30-pin "B" connector. Connect DVOM between Green 30-pin "B" connector terminal B15 (Blue/White wire) and ground. Block one front wheel, slowly rotate opposite wheel and measure voltage. If voltage pulses from zero volts to about 5 volts or more, replace speedometer. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. If voltage does not pulse as specified, repair open in Blue/White between VSS and speedometer.
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