Inspection Procedure

1. Perform troubleshooting in accordance with TROUBLESHOOTING REFERENCE TABLE  .
   TROUBLESHOOTING REFERENCE TABLE
   
   

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

B: Go to step   5 

A: GO TO NEXT STEP 

1. Connect an intelligent tester to the DLC3.
2. Turn the ignition switch to ON and turn the tester ON.
3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
4. Check if any DTCs have been stored. Note down any DTCs.
5. Clear DTCs (See DTC CHECK/CLEAR  ).
6. Check if the MIL goes off.

   Standard: MIL should go off. 

OK: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

NG: GO TO NEXT STEP 

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 

Fig 1: Identifying A21 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: GO TO NEXT STEP 

1. Disconnect the A21 ECM connector.
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) 

   RESISTANCE SPECIFICATION
   
   

   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.

OK: REPAIR OR REPLACE COMBINATION METER ASSEMBLY 

Fig 2: Identifying Combination Meter & ECM Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

   OK: MIL should be illuminated. 

OK: SYSTEM OK 

NG: GO TO NEXT STEP 

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

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

   HINT:

   *: The intelligent tester 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)