Inspection Procedure 2: The Engine Warning Lamp Does Not Illuminate Right after the Ignition Switch Is Turned the "ON" Position




OPERATION



  • Engine-ECU turn on engine warning lamp for 5 seconds to check for burnt-out bulb immediately after ignition switch is turned to ON.

PROBABLE CAUSES



  • Damaged connector (Engine-ECU connector, combination meter connector)
  • Damaged harness (Open circuit between engine-ECU and combination meter)
  • Failed combination meter
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check indicator illumination.

Q. Does an indicator other than the engine warning lamp illuminate?
Go to Step 2 .
Inspect combination meter and related circuits (Refer to GROUP 54A - Combination Meter - Check Chart for Trouble Symptoms ).

STEP 2. M.U.T.-III diagnosis code.

Q. Is the diagnosis code set?
Inspection chart for diagnosis code (Refer to ).
Go to Step 3 .

STEP 3. Check connector: C-105 Engine-ECU connector and C-111 combination meter connector.


Q. Are the check results normal?

Go to Step 4 .

Repair or replace.

STEP 4. Perform resistance measurement for open circuit at between C-105 engine-ECU connector and C-111 combination meter connector.



  • Disconnect C-105 engine-ECU connector and C-111 combination meter connector, and measure resistance at the wiring harness.
  • Resistance between C-105 engine-ECU connector terminal No. 11 and C-111 combination connector terminal No. 63.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?

Go to Step 5 .

Check the intermediate connector C-53 <L.H. drive vehicles> or C-35 <R.H. drive vehicles>, and repair if necessary. If intermediate connector is normal, repair the harness wire.

STEP 5. Check the trouble symptoms.

Q. Does trouble symptom persist?
Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).