DESCRIPTION
The combination meter receives vehicle speed signals from the skid control ECU via the CAN communication line. The wheel speed sensors output voltages that vary according to the vehicle speed. The skid control ECU supplies power to the wheel speed sensors. The skid control ECU calculates the vehicle speed based on the pulses of the voltage.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
If the vehicle speed is outside the allowable range when tested, perform the on-vehicle inspection (See page ).
HINT:
Before starting the following inspection, check tire size and tire air pressure.
PROCEDURE
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Check if a CAN communication DTC is output (See page ).
Result |
Proceed to |
---|---|
CAN communication DTC is not output |
A |
CAN communication DTC is output |
B |
B |
GO TO CAN COMMUNICATION SYSTEM |
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM (SPEED METER OPERATION) |
(a) Use the Active Test to check the operation of the speedometer (See page ).
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Speed Meter Operation |
Speedometer |
0, 40, 80, 120, 160, 200 mph*1 |
Acceptable range (mph): [Control range → Speedometer display]
Confirm that the vehicle is stopped with the engine idling. |
0, 40, 80, 120, 160, 200 km/h*2 |
Acceptable range (km/h): [Control range → Speedometer display]
Confirm that the vehicle is stopped with the engine idling. |
OK:
Speedometer indication is normal.
Result
Result |
Proceed to |
---|---|
OK |
A |
NG (for 4WD) |
B |
NG (for 2WD) |
C |
B |
REPLACE MASTER CYLINDER SOLENOID |
C |
SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) |
|
3. |
READ VALUE USING TECHSTREAM (VEHICLE SPEED METER) |
(a) Use the Data List to check if the speedometer is operating properly (See page ).
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Vehicle Speed Meter |
Vehicle speed/Min.: 0 mph (0 km/h), Max.: 255 km/h (158 mph) |
Almost the same as actual vehicle speed measured using a speedometer tester |
- |
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
Result |
Proceed to |
---|---|
NG |
A |
OK (for 4WD) |
B |
OK (for 2WD) |
C |
B |
REPLACE MASTER CYLINDER SOLENOID |
C |
SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) |
|
4. |
READ VALUE USING TECHSTREAM (VEHICLE SPEED) |
(a) Use the Data List to check the vehicle speed (See page ).
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Vehicle Speed |
Vehicle speed/Min.: 0 mph (0 km/h), Max.: 326 km/h (202 mph) |
Actual vehicle speed |
No large fluctuations when driving at a constant speed. |
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
Result |
Proceed to |
---|---|
OK |
A |
NG (for 4WD) |
B |
NG (for 2WD) |
C |
B |
GO TO VEHICLE STABILITY CONTROL SYSTEM |
C |
GO TO VEHICLE STABILITY CONTROL SYSTEM |
|
5. |
REPLACE COMBINATION METER ASSEMBLY |
(a) Replace the combination meter assembly with a new or normally functioning one (See page ).
OK:
The operation of the speedometer returns to normal.
Result
Result |
Proceed to |
---|---|
OK |
A |
NG (for 4WD) |
B |
NG (for 2WD) |
C |
A |
END |
B |
REPLACE MASTER CYLINDER SOLENOID |
C |
SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) |
No Response from ID BOX (B2789)
DESCRIPTION
This DTC is stored when LIN communication between the certification ECU and ID
code box stops for 10 seconds or more.
DTC Code
DTC Detection Condition
Trouble Area
B2789
No communicat ...
Disassembly
DISASSEMBLY
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for both the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
NOTICE:
When disconnecting the c ...