MIL Circuit: Procedure

1. Turn the engine switch on (IG).
2. Check the illumination of the MIL.

   Result

   Result	Proceed to
   MIL remains illuminated (Even after engine switch is turned on (IG) and several seconds have passed, MIL still remains illuminated)	A
   MIL remains off (Does not illuminate at all)	B
   MIL illuminates for several seconds, but turns off after engine is started	C

B → See step   5 

C → See step   11 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Trouble Codes.
5. Check if any DTCs have been stored. Note any DTCs.
6. Clear the DTCs. Refer to DTC CHECK / CLEAR .
7. Check if the MIL goes off.

   Result

   Result	Proceed to
   MIL goes off	A
   MIL does not go off	B

B → See step   3 

A → REPAIR CIRCUIT INDICATED BY OUTPUT DTC 

1. Disconnect the A43 ECM connector.
2. Turn the engine switch on (IG).
3. Check if the MIL is illuminated.

   Result

   Result	Proceed to
   MIL is not illuminated	A
   MIL is illuminated	B

4. Reconnect the ECM connector.

B → See step   4 

A → See step   8 

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F16-21 (CHK) or A43-24 (W) - Body ground	Always	10 kΩ or higher

4. Reconnect the combination meter assembly connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER ASSEMBLY - ECM) 

OK → See step   9 

1. 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   10 

A: Go to next step 

1. Disconnect the ECM connector.
   Fig 1: ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A43-24 (W) - Body ground	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to ECM)

4. Reconnect the ECM connector.

NG → See step   7 

OK → See step   8 

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

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   F16-21 (CHK) - A43-24 (W)	Always	Below 1 Ω

4. Reconnect the ECM connector.
5. Reconnect the combination meter assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER ASSEMBLY - ECM) 

OK → See step   12