Tachometer Malfunction

METER: METER / GAUGE SYSTEM: Tachometer Malfunction
- Tachometer Malfunction

DESCRIPTION

In this circuit, the meter CPU receives engine revolution signals from the ECM using the CAN communication lines (CAN No. 1 Bus). The meter CPU displays engine revolution data that is calculated based on the data received from the ECM.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication DTC is output Diagnosis System.

Result:





B -- GO TO CAN COMMUNICATION SYSTEM
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the tester ON.

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

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

Combination Meter:





OK:

Needle indication is normal.

NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (ENGINE SPEED SIGNAL)

(a) Connect Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the tester ON.

(d) Enter the following menus: Body Electrical / Combination Meter / Data List.

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

Combination Meter:





OK:

Engine speed displayed on the tester is almost the same as the actual engine speed.

NG -- READ VALUE USING TECHSTREAM (ENGINE SPEED SIGNAL)

OK -- REPLACE COMBINATION METER ASSEMBLY

4. READ VALUE USING TECHSTREAM (ENGINE SPEED SIGNAL)

(a) Connect Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the tester ON.

(d) Enter the following menus: DIAGNOSIS / OBD/MOBD / ENGINE / DATA LIST.

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

Engine and ECT:





OK:

Engine speed displayed on the tester is almost the same as the actual engine speed.

NG -- GO TO SFI SYSTEM
OK -- Continue to next step.

5. REPLACE ECM

(a) Replace the ECM with a new or a normal one.

OK:

The operation of the tachometer returns to normal.

NG -- REPLACE COMBINATION METER ASSEMBLY

OK -- END