Toyota Tundra Service Manual: Speedometer Malfunction

DESCRIPTION

The combination meter assembly receives vehicle speed signals from the skid control ECU via the CAN line. The vehicle speed sensor detects the voltage that varies according to the vehicle speed. The skid control ECU supplies power to the vehicle speed sensor. The skid control ECU detects vehicle speed signals based on the pulses of the voltage.

WIRING DIAGRAM

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if a CAN communication system DTC is output (See page ).

Result

Result

Proceed to

CAN communication system DTC is not output

A

CAN communication system DTC is output

B

B

GO TO CAN COMMUNICATION SYSTEM

A

2.

CHECK SFI SYSTEM (VEHICLE SPEED)

(a) Check if a SFI system DTC is output.

  • for 1UR-FE (See page )
  • for 3UR-FE (See page )
  • for 3UR-FBE (See page )
Result

Result

Proceed to

SFI system DTC is not output

A

SFI system (for 1UR-FE) DTC is output

B

SFI system (for 3UR-FE) DTC is output

C

SFI system (for 3UR-FBE) DTC is output

D

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

C

GO TO DIAGNOSTIC TROUBLE CODE CHART

D

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

3.

PERFORM ACTIVE TEST USING TECHSTREAM (SPEEDOMETER)

(a) Operate the Techstream according to the display and select "Active Test" (See page ).

Combination Meter:

Tester Display

Test Part

Control Range

Diagnostic Note

Speed Meter Operation

Speedometer

0, 40, 80, 120, 160 or 200

Acceptable range (km/h or mph): [Control range → Speedometer display]

for mph

  • 40 mph → 39.3 to 42.1 mph
  • 80 mph → 79.8 to 84.3mph

for km/h

  • 40 km/h → 38.5 to 43 km/h
  • 80 km/h → 78.9 to 83.9 km/h
  • 120 km/h → 119.6 to 124.6 km/h
  • 160 km/h → 160.3 to 165.3 km/h

OK:

Needle indication is normal.

HINT:

  • Confirm that the vehicle is stopped and engine is idling. It is normal that door will be locked automatically when performing the speedometer Active Test.
  • The displayed value has the same units (km/h, mph) as the main scale of the vehicle's speedometer.
  • The needle position should be within the acceptable tolerance.
NG

REPLACE COMBINATION METER ASSEMBLY

OK

4.

READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Operate the Techstream according to the display and select "Data List" (See page ).

Combination Meter:

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Vehicle Speed Meter

Vehicle speed/Min.: 0 (0), Max.: 255 (158)

Almost same as actual speed (when driving)

Unit: km/h (mph)

OK:

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

OK

REPLACE COMBINATION METER ASSEMBLY

NG

5.

READ VALUE USING TECHSTREAM (WHEEL SPEED SENSOR)

(a) Operate the Techstream according to the display and select "Data List" (See page ).

ABS/VSC/TRAC:

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

FR Wheel Speed

Front wheel speed sensor RH reading

Min.: 0 km/h (0 mph), Max.: 326 km/h (203 mph)

Actual wheel speed

Similar speed as indicated on speedometer

FL Wheel Speed

Front wheel speed sensor LH reading

Min.: 0 km/h (0 mph), Max.: 326 km/h (203 mph)

Actual wheel speed

Similar speed as indicated on speedometer

RR Wheel Speed

Rear wheel speed sensor RH reading

Min.: 0 km/h (0 mph), Max.: 326 km/h (203 mph)

Actual wheel speed

Similar speed as indicated on speedometer

RL Wheel Speed

Rear wheel speed sensor LH reading

Min.: 0 km/h (0 mph), Max.: 326 km/h (203 mph)

Actual wheel speed

Similar speed as indicated on speedometer

OK:

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

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)

    Problem Symptoms Table

    System Description

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