Inspection Procedure
6: The tachometer does not work (the other meters work).
COMMENTS ON TROUBLE SYMPTOM
If only the tachometer does not operate, the ignition signal from the engine-ECU may not
be received or the combination meter may have a problem.
PROBABLE CAUSES
- Malfunction of combination meter
- Malfunction of engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting
).
STEP 2. M.U.T.-III diagnosis code
Check if diagnosis code is set in the combination meter.
Q.
Is the diagnosis code set?
Troubleshoot the combination meter (Refer to
).
Complete the combination meter troubleshooting, then go to Step 6.
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if diagnosis code is set in the engine-ECU.
Q.
Is the diagnosis code set?
Troubleshoot the engine (Refer to GROUP 13A - Troubleshooting
<4G6>, GROUP
13B - Troubleshooting
<4D5> or GROUP
13C - Troubleshooting
<4N1>). Complete
the engine troubleshooting, and then go to Step 6.
Go to Step 4.
STEP 4. M.U.T.-III actuator test
- Item 2: Tachometer (Refer to
).
Q.
Is the check result normal?
Go to Step 5.
Replace the combination meter (Refer to
), and
then go to Step 6.
STEP 5. M.U.T.-III special function
- Item 4: Pointer (AUTO) (Refer to
).
Q.
Is the check result normal?
Go to Step 6.
Replace the combination meter (Refer to
), and
then go to Step 6.
STEP 6. Retest the system
Check that the tachometer works normally.
Q.
Is the check result normal?
The procedure is complete. (If no malfunctions are found in all steps, an intermittent
malfunction is suspected. Refer to GROUP 00 / How to Cope with Intermittent Malfunction
).
Go to Step 1.