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Component Tests: Speedometer

WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Tire wear and tire over or under inflation will increase the indication error.
  1. On-Vehicle Inspection -  Using a speedometer tester, inspect the speedometer for allowable indication error and check the operation of the odometer. See INSPECTING SPEEDOMETER ON-VEHICLE  table. If error is excessive, replace the speedometer. See COMBINATION METER  under REMOVAL & INSTALLATION.
    INSPECTING SPEEDOMETER ON-VEHICLE

    Standard Indication Allowable Range
    USA (mph)
    20 18-24
    40 38-44
    60 56-66
    80 78-88
    100 98-110
    120 118-132
    Canada (km/h)
    20 17-24
    40 38-46
    60 57.5-67
    80 77-88
    100 96-109
    120 115-130
    140 134-151.5
    160 153-173
  2. Resistance Inspection -  Remove the meter cover, A/C and combination meter integrated ECU and combination meter circuit plate. See COMBINATION METER  under REMOVAL & INSTALLATION. Measure the resistance between terminals with fixing pointer to the stopper. See CONNECTOR IDENTIFICATION . See INSPECTING SPEEDOMETER ASSEMBLY RESISTANCE  table. If resistance value is not as the specified, replace the meter. See COMBINATION METER  under REMOVAL & INSTALLATION.
    INSPECTING SPEEDOMETER ASSEMBLY RESISTANCE

    Tester Connection Resistance (Ohms)
    A - B 140-185
    C - D 130-175
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