Tachometer Malfunction
METER / GAUGE SYSTEM: Tachometer Malfunction
Tachometer Malfunction
DESCRIPTION
The meter CPU receives engine revolution signals from the ECM via the CAN communication lines. 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 BY TECHSTREAM (TACHO METER OPERATION)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester 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:
Needle indication is normal.
NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- Continue to next step.
3. READ VALUE OF TECHSTREAM (ENGINE RPM)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester 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 tester is almost the same as the actual engine speed.
NG -- READ VALUE OF TECHSTREAM (ENGINE SPEED)
OK -- REPLACE COMBINATION METER ASSEMBLY
4. READ VALUE OF TECHSTREAM (ENGINE SPEED)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester 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 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 to a new or a normal one.
OK:
The operation of the tachometer returns to normal.
NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- END