MIL Circuit: Procedure

1. Perform troubleshooting in accordance with the chart below.
   RESULT
   
   

   Result	Proceed to
   MIL remains ON	A
   MIL does not illuminate	B

B → See step   5 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Check whether any DTCs have been stored. Note them down if necessary.
5. Clear DTCs. Refer toDTC CHECK / CLEAR .
6. Check if the MIL turns off.

   OK

   MIL should turn off.

NG → See step   3 

OK → See step   8 

Fig 1: Identifying E78 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   OK

   MIL is not illuminated.

   TEXT IN ILLUSTRATION
   
   

   *1	Rear view of wire harness connector (to ECM)

NG → See step   4 

OK → See step   9 

1. Disconnect the ECM connector.
2. Disconnect the combination meter connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   E14-8 (CHK) or E78-13 (W) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10 

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

   OK

   MIL should be illuminated.

NG → See step   6 

OK → See step   11 

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

   Result	Proceed to
   Engine starts	A
   Engine does not start*	B

   HINT: 

   *: The Techstream cannot communicate with the ECM.

B → See step   12 

A: Go to next step 

1. See the combination meter troubleshooting procedure. Refer toHOW TO PROCEED WITH TROUBLESHOOTING .

NG → See step   10 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR