METER / GAUGE SYSTEM Speedometer Malfunction
| DTC Code | DTC Name |
|---|---|
| Speedometer Malfunction |
DESCRIPTION
The combination meter assembly receives vehicle speed signals from the skid control ECU via the CAN communication system. The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid control ECU supplies power to the vehicle speed sensor. The skid control ECU detects vehicle speed signals based on pulses of the voltage.
Factors that affect the indicated vehicle speed include the tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using the GTS. For details about testing and the margin of error, see the reference chart.
If the vehicle speed sensor circuit has a malfunction, the skid control ECU stores DTCs. Troubleshoot the vehicle stability control system or anti-lock brake system.
Vehicle stability control system:Click here
Anti-lock brake system:Click here
WIRING DIAGRAM
CAUTION / NOTICE / HINT
If the vehicle speed is outside the allowable range when tested, perform the on-vehicle inspection.
Before starting the following inspection, check tire size and tire air pressure.
PROCEDURE
CHECK CAN COMMUNICATION SYSTEM
Check if CAN communication DTCs are output.
Result
Result
Proceed to
CAN communication DTCs are not output.
A
CAN communication DTCs are output.
B
PERFORM ACTIVE TEST USING GTS (SPEED METER OPERATION)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Combination Meter / Active Test.
Check the operation by referring to the table below.
Body Electrical > Combination Meter > Active Test
Tester Display
Measurement Item
Control Range
Diagnostic Note
Speed Meter Operation
Speedometer
OFF, 0, 40, 80, 120, 160, 200, 240 km/h
OFF, 0, 40, 80, 120, 160 mph
-
Body Electrical > Combination Meter > Active Test
Tester Display
Speed Meter Operation
OK
Speedometer indication is normal.
Result
Proceed to
OK
NG
CHECK FOR DTC
Check if vehicle stability control system or anti-lock brake system DTCs are output.
Vehicle stability control system:Click here
Anti-lock brake system:Click here
Result
Result
Proceed to
DTCs are not output.
A
DTC are output (w/ VSC).
B
DTC are output (w/o VSC).
C
READ VALUE USING GTS (VEHICLE SPEED, VEHICLE SPEED METER)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus:
for ABS/VSC/TRC: Chassis / ABS/VSC/TRC / Data List.
for Combination Meter: Body Electrical / Combination Meter / Data List.
Check the values by referring to the table below.
Chassis > ABS/VSC/TRC > Data List
Tester Display
Measurement Item
Range
Normal Condition
Diagnostic Note
Vehicle Speed
Maximum wheel speed sensor reading
Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)
Vehicle stopped: 0 km/h (0 mph)
When driving at constant speed: No large fluctuations
Chassis > ABS/VSC/TRC > Data List
Tester Display
Vehicle Speed
Body Electrical > Combination Meter > Data List
Tester Display
Measurement Item
Range
Normal Condition
Diagnostic Note
Vehicle Speed Meter
Vehicle speed
Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)
Almost the same as actual vehicle speed
-
Body Electrical > Combination Meter > Data List
Tester Display
Vehicle Speed Meter
Result
Result
Proceed to
The data list values of the ECUs match.
A
The data list values of the ECUs do not match.
B
Tip:When the Data List values of the ECUs match, an internal malfunction of the combination meter assembly is suspected.
When the Data List values of the ECUs do not match, a signal output error of the skid control ECU or an internal malfunction of the combination meter assembly is suspected.
REPLACE COMBINATION METER ASSEMBLY
Replace the combination meter assembly with a new or known good one.
OK
The operation of the speedometer returns to normal.
Result
Proceed to
OK
NG
OK END