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
A -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM (SPEEDOMETER)
(a) Operate the Techstream according to the display and select or "Active Test".

Combination Meter:





OK:
Needle indication is normal.
NG -- REPLACE NO. 1 METER ECU
OK -- Continue to next step.
3. READ VALUE USING TECHSTREAM (VEHICLE SPEED)
(a) Operate the Techstream according to the display and select "Data List".

Combination Meter:





OK:
Vehicle speed displayed on the Techstream is almost the same as actual vehicle speed measured using speedometer tester (calibrated chassis dynamometer).
NG -- READ VALUE USING TECHSTREAM (WHEEL SPEED SENSOR)
OK -- REPLACE NO. 1 METER ECU
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 the 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
OK -- REPLACE NO. 1 METER ECU