METER / GAUGE / DISPLAY 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 system. The speed sensor detects the wheel speed and sends the appropriate signals to the brake actuator assembly (skid control ECU). The brake actuator assembly (skid control ECU) supplies power to the vehicle speed sensor. The brake actuator assembly (skid control ECU) detects vehicle speed signals based on pulses of the voltage.

w/o ABS

The combination meter assembly receives vehicle speed signals from the speedometer sensor. The speedometer sensor detects input voltage that varies according to the vehicle speed. The speedometer sensor transmits vehicle speed signals as pulses to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly.

HINT:: ·

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.

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM>ON-VEHICLE INSPECTION

·

w/ ABS:

If the vehicle speed sensor circuit has a malfunction, the brake actuator assembly (skid control ECU) stores DTCs. Troubleshoot the anti-lock brake system (w/ ABS) or vehicle stability control system (w/ VSC).

w/ ABS: Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DTC CHECK / CLEAR

w/ VSC: Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>DTC CHECK / CLEAR

WIRING DIAGRAM

w/ ABS

0.219,3.094 1.802,3.49 1.583,0.396 10 Brake Actuator Assembly (Skid Control ECU) 2.927,3.167 3.49,3.583 0.563,0.417 10 : 3,3.188 4.719,3.563 1.719,0.375 10 CAN Communication Line 5.24,3.115 7.156,3.375 1.917,0.26 10 Combination Meter Assembly

w/o ABS

2.135,1.927 3.656,2.167 1.521,0.24 10 false Speedometer Sensor 2.146,1.76 2.448,1.948 0.302,0.188 10 false B44 4.906,1.917 6.792,2.135 1.885,0.219 10 false Combination Meter Assembly 4.906,1.771 5.208,1.958 0.302,0.188 10 false E43 2.354,1.302 2.656,1.49 0.302,0.188 10 false SE 2.354,0.667 2.656,0.854 0.302,0.188 10 false IG+ 3,0.948 3.302,1.135 0.302,0.188 10 false SI 5.302,0.938 5.604,1.125 0.302,0.188 10 false SI 5.104,0.833 5.406,1.021 0.302,0.188 10 false 5 3.25,0.823 3.417,1 0.167,0.177 10 false 3 2.167,0.563 2.333,0.74 0.167,0.177 10 false 1 2.167,1.208 2.313,1.385 0.146,0.177 10 false 2 0.521,0.625 1.51,0.99 0.99,0.365 10 false from IG2 Relay

CAUTION / NOTICE / HINT

NOTICE:: If the vehicle speed is outside the allowable range when tested, perform the on-vehicle inspection.; Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM>ON-VEHICLE INSPECTION

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

PROCEDURE

1.CONFIRM VEHICLE TYPE

Choose the model to be inspected.

Result:

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

2.CHECK CAN COMMUNICATION SYSTEM

3.PERFORM ACTIVE TEST USING GTS (SPEED METER OPERATION)

2.CHECK CAN COMMUNICATION SYSTEM

Check if CAN communication system DTCs are output.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>DIAGNOSIS SYSTEM

Result:

Result	Proceed to
CAN communication system DTCs are not output	A
CAN communication system DTCs are output	B

3.PERFORM ACTIVE TEST USING GTS (SPEED METER OPERATION)

GO TO CAN COMMUNICATION SYSTEM

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING

3.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.

Perform the Active Test according to the display on the GTS.

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 or 240	There is a deviation in the values displayed on the speedometer (Control range → Speedometer) Reference km/h: · 40 → 41.7 to 46.2 · 80 → 83.4 to 88.4 · 120 → 125.1 to 130.6 · 160 → 166.2 to 173.2 · 200 → 207.7 to 215.7

Body Electrical > Combination Meter > Active Test

Tester Display
Speed Meter Operation

50004 122 1

OK:: Speedometer indication is normal.

Result:

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

4.CHECK FOR DTC

7.CHECK HARNESS AND CONNECTOR (SPEEDOMETER SENSOR - BODY GROUND)

REPLACE COMBINATION METER ASSEMBLY

Click hereVehicle Interior>METER / GAUGE / DISPLAY>COMBINATION METER>REMOVAL

4.CHECK FOR DTC

Check if anti-lock brake system (w/ ABS) or vehicle stability control system (w/ VSC) DTCs are output.

w/ ABS: Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DTC CHECK / CLEAR

w/ VSC: Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>DTC CHECK / CLEAR

Chassis > ABS/VSC/TRC > Trouble Codes: 50001 105

Result:

Result	Proceed to
DTCs are not output	A
DTCs are output (w/ ABS)	B
DTCs are output (w/ VSC)	C

5.READ VALUE USING GTS (VEHICLE SPEED, VEHICLE SPEED METER)

GO TO ANTI-LOCK BRAKE SYSTEM

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING

GO TO VEHICLE STABILITY CONTROL SYSTEM

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING

5.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.

ii.

for Combination Meter: Body Electrical / Combination Meter / Data List.

Read the Data List according to the display on the GTS.

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

50003 105 42

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

50003 122 8

Result:

Result	Proceed to
The Data List values of the ECUs match	A
The Data List values of the ECUs do not match	B

HINT:: ·

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

REPLACE COMBINATION METER ASSEMBLY

Click hereVehicle Interior>METER / GAUGE / DISPLAY>COMBINATION METER>REMOVAL

6.REPLACE COMBINATION METER ASSEMBLY

Replace the combination meter assembly with a new or known good one.

Click hereVehicle Interior>METER / GAUGE / DISPLAY>COMBINATION METER>REMOVAL

OK:: The operation of the speedometer returns to normal.

Result:

Proceed to
OK
NG

END

REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR>REMOVAL

7.CHECK HARNESS AND CONNECTOR (SPEEDOMETER SENSOR - BODY GROUND)

Disconnect the B44 speedometer sensor connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
B44-2 (SE) - Body ground	Always	Below 1 Ω

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
B44-1 (IG+) - Body ground	Ignition switch off	Below 1 V
B44-1 (IG+) - Body ground	Ignition switch ON	11 to 14 V

Result:

Proceed to
OK
NG

8.INSPECT SPEEDOMETER SENSOR (INPUT WAVEFORM)

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.INSPECT SPEEDOMETER SENSOR (INPUT WAVEFORM)

1.521,0.396 1.896,0.646 0.375,0.25 2.281,1.24 2.385,0.677 false 0.135,0.135 0.448,0.333 0.313,0.198 10 false *a 1.594,0.438 2.146,0.75 0.552,0.313 10 false E43 2.365,0.5 2.917,0.813 0.552,0.313 10 false SI 1.26,4 1.813,4.313 0.552,0.313 10 false A 2.948,3.698 3.396,4.021 0.448,0.323 10 false GND

*a	Component with harness connected (Combination Meter Assembly)

Check the input waveform.

Connect the B44 speedometer sensor connector.

ii.

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

iii.

Connect an oscilloscope to terminal E43-5 (SI) and body ground.

iv.

Turn the ignition switch to ON.

Turn a wheel slowly.

vi.

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

Item	Condition
Tester Connection	E43-5 (SI) - Body ground
Tool setting	5 V/DIV., 20 ms./DIV.
Vehicle condition	Ignition switch ON, wheel being rotated

OK:: The waveform is similar to that shown in the illustration.

HINT:: 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.

Result:

Proceed to
OK
NG

REPLACE COMBINATION METER ASSEMBLY

Click hereVehicle Interior>METER / GAUGE / DISPLAY>COMBINATION METER>REMOVAL

9.CHECK HARNESS AND CONNECTOR (SPEEDOMETER SENSOR - COMBINATION METER ASSEMBLY)

Disconnect the B44 speedometer sensor connector.

Disconnect the E43 combination meter assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
B44-3 (SI) - E43-5 (SI)	Always	Below 1 Ω

Result:

Proceed to
OK
NG

10.REPLACE COMBINATION METER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.REPLACE COMBINATION METER ASSEMBLY

Replace the combination meter assembly with a new or known good one.

Click hereVehicle Interior>METER / GAUGE / DISPLAY>COMBINATION METER>REMOVAL

OK:: The operation of the speedometer returns to normal.

Result:

Proceed to
OK
NG

END

REPLACE SPEEDOMETER SENSOR

for Manual Transaxle (C50): Click hereDrivetrain>C50 MANUAL TRANSMISSION / TRANSAXLE>MANUAL TRANSAXLE ASSEMBLY>REMOVAL

for Automatic Transaxle (U441E): Click hereDrivetrain>U441E AUTOMATIC TRANSMISSION / TRANSAXLE>AUTOMATIC TRANSAXLE ASSEMBLY>REMOVAL