Speedometer Malfunction

METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Speedometer Malfunction

Speedometer Malfunction

DESCRIPTION

The meter CPU receives vehicle speed signals from the skid control ECU via the CAN communication line (CAN No. 1 Bus). 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.
HINT: If the vehicle speed sensor circuit has a malfunction, the skid control ECU outputs the DTCs. Perform troubleshooting with the Brake Control System ABS (Antilock Brake System) (w/o VSC), Vehicle Stability Control System (w/ VSC)).

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM
(a) Check if CAN communication DTC is output Diagnosis System.
Result:






B -- GO TO CAN COMMUNICATION SYSTEM
A -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM (SPEED METER OPERATION)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.
(e) Check the operation by referring to the values in the table below.

Combination Meter





- *1: for U.S.A.
- *2: except for U.S.A.

OK:
Speedometer indication is normal.
NG -- REPLACE COMBINATION METER
OK -- Continue to next step.
3. READ VALUE USING TECHSTREAM (VEHICLE SPEED METER)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Combination Meter / Data List.
(e) Check the values by referring to the values in the table below.

Combination Meter





OK:
Vehicle speed displayed on the Techstream is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).
NG -- READ VALUE USING TECHSTREAM (FR/FL/RR/RL WHEEL SPEED)
OK -- REPLACE COMBINATION METER
4. READ VALUE USING TECHSTREAM (FR/FL/RR/RL WHEEL SPEED)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
(e) Check the values by referring to the table below.

ABS/VSC/TRAC





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






C -- GO TO BRAKE CONTROL SYSTEM (w/ VSC)
B -- GO TO BRAKE CONTROL SYSTEM (w/o VSC)
A -- Continue to next step.
5. REPLACE SKID CONTROL ECU
(a) Replace the skid control ECU with a new or a known good one Removal (w/o VSC), Removal (w/ VSC)).
OK:
The operation of the speedometer returns to normal.
NG -- REPLACE COMBINATION METER
OK -- END