MIL Circuit [09/2014 - 10/2015]: Procedure

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

   Result

   Result	Proceed to
   MIL remains illuminated (Even after power switch is turned to 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

Result:  B

B 

See step  5

Result:  C

C 

CHECK FOR INTERMITTENT PROBLEMS 

(See service information). Refer to CHECK FOR INTERMITTENT PROBLEMS [09/2014 - ] )

Result:  A

A 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Check if any DTCs have been stored. Note any DTCs.
6. Clear the DTCs (See service information). Refer to DTC CHECK / CLEAR [09/2014 - ] ).
7. Check if the MIL goes off.

   Result

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

Result:  A

A 

REPAIR CIRCUIT INDICATED BY OUTPUT DTC 

(See service information). Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2014 - 10/2015] )

Result:  B

B 

See step  3

1. Disconnect the ECM connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Turn the power 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.

Result:  A

A 

REPLACE ECM 

(See service information). Refer to REMOVAL [09/2014 - ] )

Result:  B

B 

See step  4

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
   N40-5 (CHK) or A20-27 (W) - Body ground	Always	10 kΩ or higher

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

Result:  OK

OK 

REPLACE COMBINATION METER ASSEMBLY 

(See service information). Refer to REMOVAL [09/2014 - ] )

Result:  NG

NG 

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

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Put the engine in inspection mode (maintenance mode) (See service information). Refer to INSPECTION MODE PROCEDURE [09/2014 - 10/2015] ).
5. Start the engine.

   Result

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

   HINT: 

   *: The Techstream cannot communicate with the ECM.

Result:  B

B 

GO TO VC OUTPUT CIRCUIT 

(See service information). Refer to VC Output Circuit [09/2014 - 10/2015] )

Result:  A

A 

See step  6

1. Disconnect the ECM connector.
2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A20-27 (W) - Body ground	Power switch on (IG)	11 to 14 V

4. Reconnect the ECM connector.

Result:  OK

OK 

REPLACE ECM 

(See service information). Refer to REMOVAL [09/2014 - ] )

Result:  NG

NG 

See step  7

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
   N40-5 (CHK) - A20-27 (W)	Always	Below 1 Ω

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

Result:  OK

OK 

REPLACE COMBINATION METER ASSEMBLY 

(See service information). Refer to REMOVAL [09/2014 - ] )

Result:  NG

NG 

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