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 INTELLIGENT TESTER OR TECHSTREAM (TACHOMETER)
(a) Operate the intelligent tester or Techstream according to the display and select "ACTIVE TEST" or "Active Test".
(1) Intelligent tester
METER:
(2) Techstream
Combination Meter:
OK:
Needle indication is normal.
NG -- REPLACE NO. 1 METER ECU
OK -- Continue to next step.
3. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (ENGINE SPEED)
(a) Operate the intelligent tester or Techstream according to the display and select "DATA LIST" or "Data List".
(1) Intelligent tester
METER:
(2) Techstream
Combination Meter:
OK:
Engine speed displayed on tester is almost the same as actual engine speed.
NG -- READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (ENGINE SPEED)
OK -- REPLACE NO. 1 METER ECU
4. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (ENGINE SPEED)
(a) Operate the intelligent tester or Techstream according to the display and select "DATA LIST" or "Data List".
(1) Intelligent tester
ENGINE AND ECT:
(2) Techstream
Engine:
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 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 that the operation of the tachometer returns to normal Component Tests and General Diagnostics.
OK:
Operation of tachometer returns to normal.
NG -- REPLACE ECM
OK -- END (COMBINATION METER IS DEFECTIVE)