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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0500: Vehicle Speed Sensor "A" Or DTC P0503: Vehicle Speed Sensor "A" Intermittent/Erratic/High >> Diagnosis & Repair

Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect scan tool to Data Link Connector (DLC) No. 3. See Figure. Turn ignition on. Turn scan tool on. Test drive vehicle and compare scan tool displayed speed with actual vehicle speed. If scan tool indicated speed matches actual vehicle speed, go to step  3. If scan tool indicated speed does not match actual vehicle speed, go to next step.
  2. Check instrument cluster assembly. See appropriate INSTRUMENT PANEL - SC430 article. Repair or replace as necessary. If okay, go to next step.
  3. Access ECM at left front of engine compartment. Disconnect ECM E3 connector. Measure resistance between terminals SP2+ and SP2- at ECM E3 connector. See Fig 1. If 560-680 ohms are present, replace ECM and retest system. If 560-680 ohms are not present, go to next step.
    Fig 1: Checking Resistance At ECM E3 Connector Terminals SP2+ & SP2-
    G00241624Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Remove VSS from rear of transmission. Using an ohmmeter, measure resistance between VSS connector terminals. See Fig 2. Resistance should be 560-680 ohms. Using a voltmeter set to AC voltage, measure voltage between VSS connector terminals. Place a magnet close to front of VSS and quickly remove (to generate a very low voltage pulse). If voltage pulse is not generated, replace VSS and retest. If voltage pulse is generated, go to next step.
    Fig 2: Measuring Resistance At Speed Sensor Terminals
    G00241625Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Disconnect the V1 2-pin speed sensor connector. See Fig 3. Disconnect the ECM E3 connector. Check the continuity between the wire harness side connectors. See Fig 4. See SPEED SENSOR/ECM CONTINUITY CHECK  table. If continuity is to specification, replace ECM. If continuity is not to specification, repair or replace harness and connector.
    Fig 3: Identifying Speed Sensor 2-Pin Connector Terminals
    G00241626Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Checking Continuity At ECM E3 Connector Terminals
    G00241627Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SPEED SENSOR/ECM CONTINUITY CHECK

    Terminals No. Specification
    (V1-1) - SP2+ (E3-23) Continuity
    (V1-2) - SP2- (E3-22) Continuity
    (V1-1) Or SP2+ (E3-23) - E1 (E3-7) No Continuity
    (V1-2) Or SP2- (E3-22) - E1 (E3-7) No Continuity
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