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   13 

A: Go to next step 

1. Connect 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.

   Standard

   MIL goes off.

   Result

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

B → See step   3 

A → See step   8 

1. Disconnect the A6 ECM connector.
2. Turn the engine switch on (IG).
3. Check the MIL is not 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   11 

1. Disconnect the A6 ECM connector.
2. Disconnect the J35 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for short)

   Tester Connection	Specified Condition
   A6-8 (W) or J35-12 (EFI) - Body ground	10 kΩ or higher

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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   14 

A: Go to next step 

1. Disconnect the A6 ECM connector.
2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Specified Condition
   A6-8 (W) - Body ground	11 to 14 V

4. Reconnect the ECM connector.

NG → See step   7 

OK → See step   12 

1. Disconnect the A6 ECM connector.
2. Disconnect the J35 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Specified Condition
   A6-8 (W) - J35-12 (EFI)	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Specified Condition
   A6-8 (W) or J35-12 (EFI) - Body ground	10 kΩ or higher

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

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

NG → See step   10