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METER / GAUGE SYSTEM > Speedometer Malfunction

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DESCRIPTION

The meter ECU (No. 3 meter circuit plate) receives vehicle speed signals from the skid control ECU via the CAN communication system (CAN No. 1 Bus). The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid control ECU supplies power to the vehicle speed sensor. The skid control ECU detects vehicle speed signals based on the pulses of the voltage.

HINT:
  1. Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart (Click here).
  2. If the vehicle speed sensor circuit has a malfunction, the skid control ECU stores the DTCs. Troubleshoot the Brake Control System (Click here).


WIRING DIAGRAM


E143765E29


INSPECTION PROCEDURE

NOTICE:
If the vehicle speed is outside the allowable range when tested, perform the on-vehicle inspection (Click here).

HINT:
Before starting the following inspection, check tire size and tire air pressure.

1.CHECK CAN COMMUNICATION SYSTEM

  1. Check if a CAN communication DTC is output (Click here).

    Result:

    Result
    		Proceed to
    CAN communication DTC is not output.
    		A
    CAN communication DTC is output.
    		B



B
GO TO CAN COMMUNICATION SYSTEM (Click here)
A


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SPEED METER OPERATION)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Combination Meter / Active Test.

  1. Check the operation by referring to the table below.

    Combination Meter 
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Speed Meter Operation
    		Speedometer
    		0, 40, 80, 120 mph*1
    		Confirm that the vehicle is stopped with the engine idling
    0, 40, 80, 120, 160, 200, 240 km/h*2

    1. *1: for models with mph unit
    2. *2: for models with km/h unit

    OK:
    Speedometer indication is normal.



NG
REPLACE COMBINATION METER ASSEMBLY (NO. 3 METER CIRCUIT PLATE) (Click here)
OK


3.CHECK BRAKE CONTROL SYSTEM

  1. Check if the brake control system output the DTC (Click here).


Result:

Result
Proceed to
The DTC is not output.
A
The DTC is output.
B



B
GO TO BRAKE CONTROL SYSTEM (Click here)
A


4.READ VALUE USING INTELLIGENT TESTER (FR/FL/RR/RL WHEEL SPEED, VEHICLE SPEED METER)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus:

    1. for ABS/VSC/TRAC: Chassis / ABS/VSC/TRC / Data List.

    2. for Combination Meter: Body Electrical / Combination Meter / Data List.

  1. Check the values by referring to the table below.

    ABS/VSC/TRC 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    FR Wheel Speed
    		Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (203 mph)
    		Almost the same as actual vehicle speed (Speedometer tester)
    		-
    FL Wheel Speed
    		Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (203 mph)
    		Almost the same as actual vehicle speed (Speedometer tester)
    		-
    RR Wheel Speed
    		Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (203 mph)
    		Almost the same as actual vehicle speed (Speedometer tester)
    		-
    RL Wheel Speed
    		Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (203 mph)
    		Almost the same as actual vehicle speed (Speedometer tester)
    		-

    Combination Meter 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Vehicle Speed Meter
    		Vehicle speed/Min.: 0 mph (0 km/h), Max.: 199 km/h (124 mph)
    		Almost the same as actual vehicle speed (Speedometer tester)
    		-

    OK:
    When the Data List values of the ECUs match, an internal malfunction of the combination meter assembly is suspected.

    NG:
    When the Data List values of the ECUs do not match, a signal output error of the skid control ECU or an internal malfunction of the combination meter assembly is suspected.



NG
Go to step 5
OK

GO TO BRAKE CONTROL SYSTEM (Click here)  

5.REPLACE COMBINATION METER ASSEMBLY (METER CIRCUIT PLATE)

  1. Replace the combination meter assembly (meter circuit plate) with a new or a known good one (Click here).

    OK:
    The operation of the speedometer returns to normal.



NG
Go to step 6
OK

END 

6.REPLACE COMBINATION METER ASSEMBLY (NO. 4 METER CIRCUIT PLATE)

  1. Replace the combination meter assembly (No. 4 meter circuit plate) with a new or a known good one (Click here).

    OK:
    The operation of the speedometer returns to normal.



NG
Go to step 7
OK

END 

7.REPLACE COMBINATION METER ASSEMBLY (NO. 3 METER CIRCUIT PLATE)

  1. Replace the combination meter assembly (No. 3 meter circuit plate) with a new or a known good one (Click here).

    OK:
    The operation of the speedometer returns to normal.

    Result:
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C



B
REPLACE SKID CONTROL ECU (Click here)

C
REPLACE SKID CONTROL ECU (Click here)
A

END