From 08/2009

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





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

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

Result:





B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (TACHO METER OPERATION)

(a) Connect the Techstream to the DLC3.

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

(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





OK:

Tachometer indication is normal.

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

3. READ VALUE USING TECHSTREAM (ENGINE RPM)

(a) Connect the Techstream to the DLC3.

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

(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





OK:

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

(f) 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 Removal
OK -- Continue to next step.

4. READ VALUE USING TECHSTREAM (ENGINE SPEED)

(a) Connect the Techstream to the DLC3.

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

(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





OK:

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

NG -- GO TO SFI SYSTEM (for 2GR-FE) SFI System
OK -- Continue to next step.

5. REPLACE ECM

(a) Replace the ECM with a new or a known good one Removal for 2GR-FE).

OK:

The operation of the tachometer returns to normal.

NG -- REPLACE COMBINATION METER ASSEMBLY Removal

OK -- END