Inspection Procedure

1. Perform troubleshooting in accordance with the chart below.

   Result 

   RESULT REFERENCE CHART
   
   

   MIL Condition	Proceed To
   MIL remains ON	A
   MIL does not illuminate	B

B:  Go to step  4

A: Go to Next Step 

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

   OK: 

   MIL should turn off. 

OK : REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

NG: Go to Next Step 

1. Disconnect the ECM connector.
2. Turn the ignition switch to ON.
3. Check that the MIL is not illuminated.

   OK: 

   MIL is not illuminated. 

4. Reconnect the ECM connector.
Fig 1: Disconnecting E7 ECM Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK : REPLACE ECM 

NG: CHECK AND REPLACE HARNESS AND CONNECTOR 

1. Check if the MIL is illuminated when the ignition switch is turned to ON.

   OK: 

   MIL should be illuminated. 

OK : SYSTEM OK 

NG: Go to Next Step 

1. Turn the ignition switch to ON
2. Start the engine.

   Result 

   RESULT REFERENCE CHART
   
   

   Result	Proceed To
   Engine starts	A
   Engine does not start*	B
   HINT: *: The Intelligent tester cannot communicate with the ECM.

B:  Go TO VC OUTPUT CIRCUIT 

A: Go to Next Step 

1. See the combination meter troubleshooting procedure (See HOW TO PROCEED WITH TROUBLESHOOTING ).

NG: REPAIR OR REPLACE BULB OR COMBINATION METER ASSEMBLY 

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