Inspection Procedure

HINT:

Troubleshoot each trouble symptom in accordance with the table below.

1. CHECK WHETHER MIL TURNS OFF 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Check whether any DTCs have been stored (See DTC CHECK / CLEAR ). Note them down if necessary.
   5. Clear the DTCs (See DTC CHECK / CLEAR ).
   6. Check if the MIL turns off.

      OK: 

      MIL should turn off. 

   OK: REPAIR CIRCUIT INDICATED BY OUTPUT DTC 

   NG: Go to Next Step 

2. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) 
   1. Disconnect the ECM connector.
   2. Turn the ignition switch on (IG).
   3. Check that the MIL is not illuminated.

      OK: 

      MIL is not illuminated. 

   4. Reconnect the ECM connector.
   Fig 1: Identifying ECM Connector

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   OK: REPLACE ECM 

   NG: CHECK AND REPLACE HARNESS AND CONNECTOR (COMBINATION METER - ECM) 

3. CHECK THAT MIL IS ILLUMINATED 
   1. Check if the MIL is illuminated when the ignition switch is turned on (IG).

      OK: 

      MIL should be illuminated. 

   OK: SYSTEM OK 

   NG: Go to Next Step 

4. INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT) 
   1. See HOW TO PROCEED WITH TROUBLESHOOTING of the combination meter troubleshooting procedure.

   NG: REPAIR OR REPLACE BULB OR COMBINATION METER ASSEMBLY 

   OK: CHECK AND REPLACE HARNESS AND CONNECTOR (COMBINATION METER - ECM)