Inspection Procedure

HINT:

Troubleshoot each problem symptom in accordance with the chart below.

1. CLEAR DTC 
   1. Connect the intelligent tester or OBD II scan tool to the DLC3.
   2. Turn the ignition switch ON and push the intelligent tester or the OBD II scan tool main switch ON.
   3. Read the DTC.
   4. Clear the DTC (See DTC CHECK/CLEAR  ).
   5. Check that the MIL is not illuminated.

      OK: MIL is not illuminated. 

   OK: REPAIR CIRCUIT INDICATED BY OUTPUT DTC 

   NG: GO TO NEXT STEP 

2. CHECK WIRE HARNESS (CHECK FOR SHORT IN WIRE HARNESS) 
   1. Disconnect the E4 ECM connector.
   2. Turn the ignition switch ON.
   3. Check that the MIL is not illuminated.

      OK: MIL is not illuminated. 

   Fig 1: Checking Wire Harness (Check For Short In Wire Harness)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPLACE ECM 

   NG: CHECK AND REPAIR HARNESS AND CONNECTOR 

3. CHECK THAT MIL IS ILLUMINATED 
   1. Check that the MIL is illuminated when turning the engine switch ON.

      Standard: MIL is illuminated. 

   OK: SYSTEM OK 

   NG: GO TO NEXT STEP 

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

   NG: REPAIR OR REPLACE BULB OR COMBINATION METER 

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