Toyota CH-R Service Manual: Speedometer Malfunction

DESCRIPTION

The combination meter assembly receives vehicle speed signals from the skid control ECU (brake actuator assembly) via CAN communication. The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU (brake actuator assembly). The skid control ECU (brake actuator assembly) supplies power to the vehicle speed sensor. The skid control ECU (brake actuator assembly) detects vehicle speed signals based on pulses of the voltage.

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 Techstream. For details about testing and the margin of error, see the reference chart.

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  • If the vehicle speed sensor circuit has a malfunction, the skid control ECU (brake actuator assembly) stores DTCs. Troubleshoot the vehicle stability control system.

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WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • If the vehicle speed is outside the allowable range when tested, perform the on-vehicle inspection.

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  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

HINT:

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

PROCEDURE

1.

CHECK FOR DTC (METER / GAUGE SYSTEM)

(a) Check if meter / gauge system DTCs are output

Click here

Body Electrical > Combination Meter > Trouble Codes

Result

Proceed to

Meter / gauge system DTCs are not output.

A

Meter / gauge system DTCs are output.

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

2.

CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)

(a) Check if vehicle stability control system DTCs are output.

Click here

Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

Result

Proceed to

Vehicle stability control system DTCs are not output.

A

Vehicle stability control system DTCs are output.

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

3.

PERFORM ACTIVE TEST USING TECHSTREAM (SPEED METER OPERATION)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

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, 280

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

(1)for Gauge speedometer*1 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
(2) for Gauge speedometer*2 Reference km/h:
  • 40 → 38.7 to 43.2
  • 80 → 79.3 to 84.3
  • 120 → 120.3 to 125.3
  • 200 → 202.1 to 207.1
(3) for Gauge speedometer*3 Reference mph:
  • 40 → 39.5 to 42.3
  • 80 → 80.2 to 83.4
  • 120 → 121.2 to 124.4
  • *1: w/o Occupant Classification System
  • *2: w/ Occupant Classification System and w/o Daytime Running Light OFF function
  • *3: w/ Occupant Classification System and w/ Daytime Running Light OFF function
Body Electrical > Combination Meter > Active Test

Tester Display

Speed Meter Operation

OK:

Speedometer indication is normal.

OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

NG

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