Speedometer Malfunction

METER: METER / GAUGE SYSTEM: Speedometer Malfunction
- Speedometer Malfunction

DESCRIPTION

The No. 1 meter ECU receives vehicle speed signals from the skid control ECU via the CAN line. The vehicle speed sensor detects the voltage that varies according to the vehicle speed. 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.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Check for the DTC Reading and Clearing Diagnostic Trouble Codes.

Result





B -- Go to CAN COMMUNICATION SYSTEM CAN Communication System
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (SPEEDOMETER)

(a) Operate the Techstream according to the display and select "Active Test".

OK:

Needle indication is normal.

Combination Meter:





HINT
* Confirm that the vehicle is stopped and engine is idling. It is normal that door will be locked automatically when performing the speedometer Active Test.
* The displayed value has the same units (km/h, mph) as the main scale of the vehicle's speedometer.
* The needle position should be within the acceptable tolerance.

NG -- REPLACE NO. 1 METER ECU Disassembly
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Operate the Techstream according to the display and select "Data List".

OK:

Vehicle speed displayed on Techstream is almost the same as actual vehicle speed measured using speedometer tester (calibrated chassis dynamometer).

Combination Meter:





NG -- READ VALUE USING TECHSTREAM (WHEEL SPEED SENSOR)

OK -- REPLACE NO. 1 METER ECU Disassembly

4. READ VALUE USING TECHSTREAM (WHEEL SPEED SENSOR)

(a) Operate the Techstream according to the display and select "Data List".

OK:

Vehicle speed displayed on Techstream is almost the same as actual vehicle speed measured using speedometer tester (calibrated chassis dynamometer).

Electric parking brake:





NG -- Go to ELECTRONICALLY CONTROLLED BRAKE SYSTEM Electronically Controlled Brake System

OK -- REPLACE NO. 1 METER ECU Disassembly