Toyota Tundra Service Manual: Vehicle Speed Signal Circuit

Toyota Tundra Service Manual / Audio, Visual, Telematics / Park Assist / Monitoring / Intuitive Parking Assist System / Vehicle Speed Signal Circuit

WIRING DIAGRAM

PROCEDURE

1.

CHECK COMBINATION METER ASSEMBLY (SPEED SIGNAL)

(a) Disconnect the clearance warning ECU assembly connector.

(b) Using an oscilloscope, check the signal waveform of the combination meter assembly.

Measurement Condition

Item

Content

Terminal No. (Symbol)

J35-17 (SPD) - Body ground

Tool Setting

5 V/DIV., 20 msec./DIV.

Condition

Drive vehicle at 20 km/h (12 mph)

OK:

Refer to the illustration.

HINT:

As the vehicle speed increases, the wave length shortens.

Text in Illustration

*a

Front view of wire harness connector

(to Clearance Warning ECU Assembly)

*b

Waveform
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the J35 clearance warning ECU assembly connector.

(b) Disconnect the J28 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J35-17 (SPD) - J28-29 (+S)

Always

Below 1 Ω

J35-17 (SPD) - Body ground

Always

10 kΩ or higher
OK

GO TO METER / GAUGE SYSTEM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Terminals Of Ecu

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    See More:

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    TERMINALS OF ECU CHECK ECM (for 1UR-FE) HINT: The standard voltage, resistance and waveform between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals is also indicated. The result of checks should be compared with the stand ...

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