Tachometer Malfunction

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
A -- Continue to next step.

2. 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





OK:
Tachometer indication is normal.

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

3. 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





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

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

4. 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





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





C -- GO TO SFI SYSTEM (for 1AR-FE)
B -- GO TO SFI SYSTEM (for 2GR-FE)
A -- Continue to next step.

5. REPLACE ECM
(a) Replace the ECM with a new or a known good one Removal for 2GR-FE, Removal for 1AR-FE).
OK:
The operation of the tachometer returns to normal.

NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- END