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 (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.

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

(a) Connect Techstream to the DLC3.

(b) Ignition switch on (IG).

(c) Turn 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:

Needle indication is normal.

NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM

(a) Connect Techstream to the DLC3.

(b) Ignition switch on (IG).

(c) Turn 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 Techstream is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

NG -- READ VALUE USING TECHSTREAM

OK -- REPLACE COMBINATION METER ASSEMBLY

4. READ VALUE USING TECHSTREAM

(a) Connect Techstream to the DLC3.

(b) Ignition switch on (IG).

(c) Turn 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 Techstream is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

NG -- GO TO BRAKE CONTROL SYSTEM
OK -- Continue to next step.

5. REPLACE SKID CONTROL ECU

(a) Replace the skid control ECU to a new or a normal one.

OK:

The operation of the speedometer returns to normal.

NG -- REPLACE COMBINATION METER ASSEMBLY

OK -- END