METER / GAUGE SYSTEM Speedometer Malfunction

DESCRIPTION

w/ ABS:

The combination meter assembly receives vehicle speed signals from the brake actuator assembly (skid control ECU) via the CAN communication line. The wheel speed sensors output voltages that vary according to the vehicle speed. The brake actuator assembly (skid control ECU) supplies power to the wheel speed sensors. The brake actuator assembly (skid control ECU) calculates the vehicle speed based on the pulses of the voltage.

w/o ABS:

The combination meter assembly receives vehicle speed signals from the speedometer sensor. The wheel speed sensors output voltages that vary according to the vehicle speed. The speedometer sensor calculates the vehicle speed based on the pulses of the voltage.

WIRING DIAGRAM


*1	Brake Actuator Assembly (Skid Control ECU)
*2	Combination Meter Assembly
*3	CAN Communication Line

w/o ABS
*a	SE
*b	Combination Meter Assembly
*c	Speedometer Sensor

CAUTION / NOTICE / HINT

Note

When replacing the combination meter assembly, make sure to replace it with a new one.
If the vehicle speed is outside the allowable range when tested, perform the operation check.

Click here

Tech Tips

Before starting the following inspection, check tire size and tire air pressure.

PROCEDURE

CHECK VEHICLE TYPE

Check vehicle type.

Result

Result	Proceed to
w/ ABS	A
w/o ABS	B

CHECK COMBINATION METER ASSEMBLY Click here

CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

Check for DTCs.

for LHD: Click here

for RHD: Click here

OK
No DTCs are output.

Result

Result	Proceed to
OK (w/ VSC)	A
OK (w/o VSC)	B
NG	C

CHECK FOR DTC (ANTI-LOCK BRAKE SYSTEM) Click here

GO TO CAN COMMUNICATION SYSTEM for LHD: Click here
GO TO CAN COMMUNICATION SYSTEM for RHD: Click here

CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)

Check for DTCs.

Click here

Chassis > ABS/VSC/TRC > Trouble Codes

OK
No DTCs are output.

Result

Proceed to
OK
NG

GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

PERFORM ACTIVE TEST USING GTS (SPEED METER OPERATION)

Using the GTS, perform the Active Test.

Click here

Body Electrical > Combination Meter > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Speed Meter Operation	Speedometer	OFF, 0, 40, 80, 120, 160 or 200 (km/h) (for km/h) OFF, 0, 40, 80 or 100 (mph) (for mph)	There is a deviation in the values displayed on the speedometer display (Control range → Speedometer) for km/h (Type A) 40 → 41.7 to 46.2 80 → 83.4 to 88.4 120 → 125.1 to 130.6 160 → 166.2 to 173.2 180 → 186.9 to 194.5 for km/h (Type B) 40 → 41.4 to 45.9 80 → 82.7 to 87.7 120 → 124.1 to 129.1 160 → 165.4 to 170.4 for km/h (Type C) 40 → 41.0 to 45.5 80 → 82 to 87 120 → 123.1 to 128.1 160 → 164.1 to 169.1 for km/h (Type D) 40 → 40.5 to 45 80 → 81 to 86 120 → 121.4 to 126.4 160 → 161.9 to 166.9 for km/h (Type E) 40 → 40.6 to 45.1 80 → 81.3 to 86.3 120 → 121.9 to 126.9 160 → 162.5 to 167.5 for mph 40 → 42 to 44.5 80 → 83.1 to 87.1

Tester Display

Measurement Item

Control Range

Diagnostic Note

Speed Meter Operation

Speedometer

OFF, 0, 40, 80, 120, 160 or 200 (km/h) (for km/h)
OFF, 0, 40, 80 or 100 (mph) (for mph)

There is a deviation in the values displayed on the speedometer display (Control range → Speedometer)

for km/h (Type A)

40 → 41.7 to 46.2
80 → 83.4 to 88.4
120 → 125.1 to 130.6
160 → 166.2 to 173.2
180 → 186.9 to 194.5

for km/h (Type B)

40 → 41.4 to 45.9
80 → 82.7 to 87.7
120 → 124.1 to 129.1
160 → 165.4 to 170.4

for km/h (Type C)

40 → 41.0 to 45.5
80 → 82 to 87
120 → 123.1 to 128.1
160 → 164.1 to 169.1

for km/h (Type D)

40 → 40.5 to 45
80 → 81 to 86
120 → 121.4 to 126.4
160 → 161.9 to 166.9

for km/h (Type E)

40 → 40.6 to 45.1
80 → 81.3 to 86.3
120 → 121.9 to 126.9
160 → 162.5 to 167.5

for mph

40 → 42 to 44.5
80 → 83.1 to 87.1

Body Electrical > Combination Meter > Active Test

Tester Display
Speed Meter Operation

OK
Speedometer indication is normal.

Result

Proceed to
OK
NG

REPLACE COMBINATION METER ASSEMBLY Click here

READ VALUE USING GTS (VEHICLE SPEED METER)

Using the GTS, read the Data List.

Click here

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

Tech Tips

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 brake actuator assembly (skid control ECU) or an internal malfunction of the combination meter assembly is suspected.

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

Result

Proceed to
OK
NG

REPLACE COMBINATION METER ASSEMBLY Click here

READ VALUE USING GTS (VEHICLE SPEED)

Using the GTS, read the Data List.

Click here

Chassis > ABS/VSC/TRC > Data List

Tester Display	Measurement Item	Normal Condition	Reference Value	Diagnostic Note
Vehicle Speed	Vehicle speed	Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Almost the same as actual vehicle speed	-

Chassis > ABS/VSC/TRC > Data List

Tester Display
Vehicle Speed

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

Result

Proceed to
OK
NG

REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) w/ VSC: Click here
REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) w/o VSC: Click here

CHECK COMBINATION METER ASSEMBLY

Replace the combination meter assembly with a new one.

Click here

Check that the operation of the speedometer returns to normal.

OK
The operation of the speedometer returns to normal.

Result

Proceed to
OK
NG

END (COMBINATION METER ASSEMBLY IS DEFECTIVE)

REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) w/ VSC: Click here
REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) w/o VSC: Click here

CHECK FOR DTC (ANTI-LOCK BRAKE SYSTEM)

Check for DTCs.

Click here

Chassis > ABS/VSC/TRC > Trouble Codes

OK
No DTCs are output.

Result

Proceed to
OK
NG

GO TO STEP 4 Click here

GO TO ANTI-LOCK BRAKE SYSTEM Click here

CHECK COMBINATION METER ASSEMBLY

Component with harness connected

(Combination Meter Assembly)

Waveform

Remove the combination meter assembly with the connector(s) still connected.

Click here

Connect an oscilloscope to terminal G9-18 (SI) and body ground.

Check the signal waveform according to the condition(s) in the table below.

Measurement Condition
Item	Condition
Tester Connection	G9-18 (SI) - Body ground
Tool Setting	5 V/DIV, 20 ms./DIV
Vehicle Condition	Driving at approximately 20 km/h (12 mph)

Tech Tips

When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by A in the illustration narrows.

OK
The waveform displayed is as shown in the illustration.

Result

Proceed to
OK
NG

REPLACE COMBINATION METER ASSEMBLY Click here

CHECK HARNESS AND CONNECTOR (SPEEDOMETER SENSOR - COMBINATION METER ASSEMBLY AND BODY GROUND)

Disconnect the C62 speedometer sensor connector.
Disconnect the G9 and G10 combination meter assembly connectors.

Measure the resistance according to the value (s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
C62-1 (MS5) - G10-14 (MS5)	Always	Below 1 Ω
C62-3 (SI) - G9-18 (SI)	Always	Below 1 Ω
C62-2 (SE) - Body ground	Always	Below 1 Ω
C62-1 (MS5) or G10-14 (MS5) - Body ground	Always	10 kΩ or higher
C62-3 (SI) or G9-9 (SI) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)

*a
Front view of wire harness connector

(to Speedometer Sensor)

Disconnect the speedometer sensor connector.

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
C62-1 (MS5) - Body ground	Ignition switch ON	11 to 14 V
C62-1 (MS5) - Body ground	Ignition switch off	Below 1 V

Result

Proceed to
OK
NG

REPLACE SPEEDOMETER SENSOR Click here

REPLACE COMBINATION METER ASSEMBLY Click here