Tachometer Malfunction

METER: METER / GAUGE SYSTEM: Tachometer Malfunction

Tachometer Malfunction

DESCRIPTION

The No. 1 meter ECU receives engine revolution signals from the ECM via the CAN line. The No. 1 meter ECU 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 for the DTC Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- Go to CAN COMMUNICATION SYSTEM
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (TACHOMETER) Scan Tool Testing and Procedures
(a) Operate the Techstream according to the display and select "Active Test".
OK:
Needle indication is normal.

Combination Meter:





HINT: Confirm that the vehicle is stopped and engine is idling.

NG -- REPLACE NO. 1 METER ECU
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (ENGINE SPEED)
(a) Operate the Techstream according to the display and select "Data List".
OK:
Engine speed displayed on Techstream is almost the same as actual engine speed.

Combination Meter:





NG -- READ VALUE USING TECHSTREAM (ENGINE SPEED)
OK -- REPLACE NO. 1 METER ECU
4. READ VALUE USING TECHSTREAM (ENGINE SPEED)
(a) Operate the Techstream according to the display and select "Data List".
OK:
Engine speed displayed on the Techstream is almost the same as the actual engine speed.

Engine:





NG -- Go to SFI SYSTEM
OK -- Continue to next step.

5. REPLACE NO. 1 METER ECU
(a) Temporarily replace the combination meter with a new one Disassembly.
NEXT -- Continue to next step.

6. CHECK NO. 1 METER ECU
(a) Check the operation of the tachometer returns to normal Operation Check.
OK:
Operation of tachometer returns to normal.
NG -- REPLACE ECM
OK -- END (COMBINATION METER IS DEFECTIVE)