TECHNICAL DESCRIPTION (COMMENT)
The engine-A/T-ECU and its associated components, the combination meter assembly,
the wiring harness, or the connector(s) may be defective.TROUBLESHOOTING HINTS
- Malfunction of the engine-A/T-ECU
- Malfunction of the combination meter assembly
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.
DIAGNOSIS PROCEDURE
STEP 3. Check the wiring harness between combination meter connector
C-04 (terminal 46) and diagnosis connector C-24 (terminal 14).
Q: Is the wiring harness between combination meter connector C-04 (terminal 46) and diagnosis
connector C-24 (terminal 14) in good condition?
YES:
Go to Step 4
.NO: Repair or replace the damage component(s).
STEP 4. Retest the system.
Q: Is the fuel speedometer normal?
YES:
The procedure is complete. (If malfunctions are found in all steps, an intermittent
malfunction is suspected. Refer to GROUP 00, How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction 
).NO: Replace the combination meter assembly.
STEP6. Connector check: Combination meter connector C-04 and engine-A/T-ECU
connector C-110 <2400-Except MIVEC>
or C-136 <2400-MIVEC>.
Q: Is combination meter connector C-04 and engine-A/T-ECU connector C-110 <2400-Except
MIVEC>
or C-136 <2400-MIVEC>
in good condition?
YES:
Go to Step 7.NO: Repair or replace the damage component(s).
STEP 7. Check the wiring harness between combination meter connector
C-04 (terminal 46) and engine-A/T-ECU connector C-110 (terminal 80) <2400-Except
MIVEC>
or C-136 <2400-MIVEC>.
NOTE: Prior to the wiring harness inspection, check intermediate connectors C-105, and repair
if necessary.
Q: Is the wiring harness between combination meter connector C-04 (terminal 46) and engine-A/T-ECU connector
C-110 (terminal 80) <2400-Except MIVEC>
or C-136 <2400-MIVEC>
in
good condition?
YES:
Go to Step 8.NO: Repair or replace the damage component(s).
STEP 8. Retest the system.
Q: Is the speedometer normal?
YES:
The procedure is complete. (If no malfunctions are found in all steps, an intermittent
malfunction is suspected. Refer to GROUP 00, How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).NO: Go to Step 9
.STEP 9. Pulse check
NOTE: Drive the vehicle with the MUT-II/III connected to the diagnosis connector. The MUT-II/III
buzzer should sound.
| System switch |
Check conditions |
|---|---|
| Vehicle speed signal |
When the vehicle speed has reached 10 km/h or more |
OK: The MUT-II/III sounds or the voltmeter needle fluctuates.
Q: Is the check result normal?
YES:
Replace the combination meter assembly.NO: Replace the engine-A/T-ECU.