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Home >> Lexus >> 1995 >> LS 400 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - OBD-II >> Diagnostic Testing >> Code P0500: Vehicle Speed Sensor (VSS) Malfunction >> Diagnosis & Repair

Diagnosis & Repair

  1. Connect scan tester to Data Link Connector (DLC) No. 3. See Figure. Start engine. Turn scan tester on. Road test vehicle and using scan tester, read vehicle speed value. If vehicle speed matches scan tester speed value, replace ECM and retest. If vehicle speed does not match scan tester speed value, go to next step.
  2. Check speedometer operation. If speedometer is operating properly, go to next step. If speedometer is not operating properly, check for open or short in VSS circuit. See SYSTEM/COMPONENT TESTS article. Repair as necessary.
  3. Access ECM behind glove box. Turn ignition off. Disconnect ECM E13 connector. See Figure. Measure resistance between terminals No. 4 (Red wire) and No. 9 (Green wire) at ECM E13 connector. If resistance is 560-680, replace ECM and retest. If resistance is not 560-680 ohms, go to next step.
  4. Remove VSS from transmission. Measure resistance between VSS terminals. If resistance is 560-680, go to next step. If resistance is not 560-680 ohms, replace VSS and retest.
  5. Connect DVOM between VSS terminals. Set DVOM to lowest DC volt scale. While passing a magnet back and forth over tip of VSS, observe DVOM. Voltage should pulse (voltage is extremely low). If VSS operates as specified, check for open or short circuit between VSS and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. If VSS does not operate as specified, replace VSS and retest.
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