Speedometer Malfunction

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

DESCRIPTION

The meter CPU receives vehicle speed signals from the skid control ECU via the CAN communication lines (V1 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 for the "Brake Control System" Electronically Controlled Brake System.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Check if a CAN communication DTC is output.

w/ Smart Key System: How to Proceed With Troubleshooting

w/o Smart Key System: How to Proceed With Troubleshooting

Result





C -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting

B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
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 ASSEMBLY Removal
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 (READY).

(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 tester 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 ASSEMBLY Removal

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 (READY).

(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/TRAC/VSC:





OK:

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

NG -- GO TO BRAKE CONTROL SYSTEM How To Proceed With Troubleshooting
OK -- Continue to next step.

5. REPLACE SKID CONTROL ECU

(a) Replace the skid control ECU with a new or normally functioning one Removal.

OK:

The operation of the speedometer returns to normal.

NG -- REPLACE COMBINATION METER ASSEMBLY Removal

OK -- END (SKID CONTROL ECU IS DEFECTIVE)