Inspection Procedure

1. Perform troubleshooting in accordance with the table below.

   Result 

   RESULT CHART
   
   

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

B:  Go to step  5

A: Go to Next Step 

1. Connect a Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the tester ON.
4. Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
5. Check if any DTCs have been stored. Note down any DTCs.

   Result 

   RESULT CHART
   
   

   Result	Proceed To
   No DTC detected	A
   Any DTC detected	B

B: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (See  DIAGNOSTIC TROUBLE CODE CHART   ) 

A: Go to Next Step 

Fig 1: Identifying Harness And Connector (Checking Short In Wire Harness)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the A21 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.

OK: REPLACE ECM (See  REMOVAL   ) 

NG: Go to Next Step 

1. Disconnect the A21 ECM connector.
Fig 2: Identifying A21 ECM Connector And D2 Combination Meter Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D2 combination meter connector (for Hatchback).
3. Disconnect the D76 combination meter connector (for Sedan).
4. Check the resistance.

   Standard resistance (Check for short) 

   TESTER CONNECTIONS SPECIFIED CONDITIONS CHART
   
   

   Tester Connections	Specified Conditions
   W (A21-24) or combination meter (D2-4) - Body ground	10 kΩ or higher
   W (A21-24) or combination meter (D76-4) - Body ground

5. Reconnect the ECM connector.
6. Reconnect the combination meter connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPAIR OR REPLACE COMBINATION METER ASSEMBLY 

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

   OK: MIL should be illuminated. 

NG: Go to step 6 

OK: CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS   ) 

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

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

B:  GO TO VC OUTPUT CIRCUIT 

A: Go to Next Step 

• Check the MIL circuit for Hatchback (See TERMINALS OF ECU ).
• Check the MIL circuit for Sedan (See TERMINALS OF ECU ).

NG: REPAIR OR REPLACE COMBINATION METER ASSEMBLY 

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