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Home >> Scion >> 2014 >> iQ EV >> Repair and Diagnosis >> Electrical >> Gauges >> Meter / Gauge / Display (Diagnostics & Symptom Tests) (Electric) >> Meter / Gauge System >> On-Vehicle Inspection >> On-Vehicle Inspection

On-Vehicle Inspection

  1. INSPECT SPEEDOMETER 
    1. Check speedometer operation.
      NOTE:
      • The meter ECU receives the vehicle speed signal from the brake booster with master cylinder assembly (skid control ECU) via CAN communication. Therefore, perform the following inspection referring to values on the Data List of the brake booster with master cylinder assembly (skid control ECU) because it is the source of the vehicle speed signal.
      • The Data List values of the brake booster with master cylinder assembly (skid control ECU) are used for this inspection. Therefore, make sure to perform the inspection after confirming that no DTCs are output from the brake control system.
      • If the tire size or tire inflation pressure is not within the specified range, or the tires are excessively worn, the speedometer indication error will increase. Therefore, make sure to perform the inspection after checking that the tire size, tire inflation pressure and tire wear are in the specified range.
      1. Before starting the following inspection, check if the Brake Control System outputs the DTCs.
      2. Check the values by referring to the table below.
        ABS/VSC/TRC

        Techstream Display Measurement Item/Range Normal Condition Diagnostic Note
        Vehicle Speed Maximum wheel speed sensor reading
        Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)        		 Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
        REFERENCE: MPH

        Techstream Indication (mph) Acceptable Range (mph)
        20 19.3 to 21.8
        40 39.6 to 42.4
        60 60.2 to 63.0
        REFERENCE: KM/H

        Techstream Indication (km/h) Acceptable Range (km/h)
        20 21 to 25
        40 41.7 to 46.2
        60 62.7 to 67.2
        80 83.4 to 88.4
        100 104.3 to 109.3
        120 125.1 to 130.6
    2. Check LED illumination
      1. Check the illumination function of the warning or indicator light listed below when turning the power switch on (IG).

        OK

        Warning or Indicator Light Specified Condition
        Master warning light Warning or indicator light comes on for 3 seconds after turning the power switch on (IG).
        Output control warning light
        EV battery warning light
        Eco driving indicator light
        SRS warning light Warning light comes on for 6 seconds after turning the power switch on (IG).
        Slip indicator light Warning light comes on after power switch on (IG) and goes off when on (READY).
        EPS warning light
        Charge warning light
        ABS warning light
        Electrically controlled brake warning light
        Brake warning light
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