Tachometer Malfunction

DESCRIPTION

In this circuit, the meter CPU receives engine speed signals from the ECM using the CAN communication system (CAN No. 1 Bus). The meter CPU displays the engine speed 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	Proceed to
CAN communication DTC is not output.	A
CAN communication DTC is output.	B

B

GO TO CAN COMMUNICATION SYSTEM

A

1. PERFORM ACTIVE TEST USING TECHSTREAM (TACHO 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) Check the operation by referring to the table below.

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

1. READ VALUE USING TECHSTREAM (ENGINE RPM)

(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 / Data List.

(e) Check the values by referring to the table below.

Combination Meter

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Engine Rpm	Engine speed/Min.: 0 rpm, Max.: 12750 rpm	650 to 750 rpm (When idling)	If data received from the ECM exceeds the range that can be displayed on the meter, the meter continues to display the maximum value of the range.

OK:

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

NG

REPLACE COMBINATION METER ASSEMBLY

OK

1. READ VALUE USING TECHSTREAM (ENGINE SPEED)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List.

(e) Check the values by referring to the table below.

Engine and ECT

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Engine Speed	Engine speed/Min.: 0 rpm, Max.: 16383.75 rpm	650 to 750 rpm (When idling)	-

OK:

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

Result	Proceed to
OK	A
NG (for 2GR-FE)	B
NG (for 1AR-FE)	C

B

GO TO SFI SYSTEM (for 2GR-FE)

C

GO TO SFI SYSTEM (for 1AR-FE)

A

1. REPLACE ECM

(a) Replace the ECM with a new or a known good one (See page for 2GR-FE,
for 1AR-FE).

OK:

The operation of the tachometer returns to normal.

OK

END

NG

REPLACE COMBINATION METER ASSEMBLY