Toyota 4Runner manuals

Toyota 4Runner: Tachometer Malfunction

DESCRIPTION

In this circuit, the meter CPU receives engine speed signals from the ECM using the CAN communication system. The meter CPU displays the engine speed, which is calculated based on the data received from the ECM.

WIRING DIAGRAM


PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

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


Result

Result

Proceed to

CAN communication DTC is not output

A

CAN communication DTC is output

B


B

GO TO CAN COMMUNICATION SYSTEM


A

2.

PERFORM ACTIVE TEST USING TECHSTREAM (TACHO METER OPERATION)

(a) Use the Active Test to check the operation of the tachometer (See page ).


Combination Meter

Tester Display

Test Part

Control Range

Diagnostic Note

Tacho Meter Operation

Tachometer

0, 1000, 2000, 3000, 4000, 5000, 6000, 7000 (rpm)

Confirm that the vehicle is stopped with the engine idling.

OK:

Tachometer indication is normal.


NG

REPLACE COMBINATION METER ASSEMBLY


OK

3.

READ VALUE USING TECHSTREAM (ENGINE RPM)

(a) Use the Data List to check the engine speed (See page ).


Combination Meter

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Engine Rpm

Engine speed/Min.: 0 rpm, Max.: 12800 rpm

600 to 700 rpm (When idling)

If the data received from the ECM exceeds the range that can be displayed on the meter, the meter continues to display the maximum value.

OK:

Engine speed displayed on the Techstream is almost the same as the tachometer indication.

(b) Record the engine speed displayed on the Techstream.

HINT:

Check the engine speed when the engine is fully warmed up, and the air conditioning and all electrical accessories are off.


NG

REPLACE COMBINATION METER ASSEMBLY


OK

4.

READ VALUE USING TECHSTREAM (ENGINE SPEED)

(a) Use the Data List to check the engine speed (See page ).


Engine and ECT

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Engine Speed

Engine speed/Min.: 0 rpm, Max.: 16383 rpm

600 to 700 rpm (When idling)

-

OK:

Engine speed displayed on the Techstream is almost the same as the previously recorded Techstream value (Body Electrical / Combination Meter / Data List / Engine Rpm).


NG

GO TO SFI SYSTEM


OK

5.

REPLACE ECM

(a) Replace the ECM with a new or normally functioning one (See page ).


OK:

The operation of the tachometer returns to normal.


OK

END


NG

REPLACE COMBINATION METER ASSEMBLY

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