Inspection Procedure

1. Perform troubleshooting in accordance with the table below.

Result 

B:  Go to step  5

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Enter the following menus: Powertrain / Engine and ECT / Trouble 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.

OK: MIL should go off. 

OK: REPAIR CIRCUIT INDICATED BY OUTPUT DTC 

NG: Go to next step 

1. Disconnect the A53 ECM connector.
2. Turn the power switch on (IG).
3. Check that the MIL is not illuminated.

   OK: MIL is not illuminated. 

4. Reconnect the ECM connector.
Fig 1: Identifying A53 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE ECM 

NG: Go to next step 

1. Disconnect the K31 combination meter connector.
2. Disconnect the A53 ECM connector.
3. Measure the resistance.

   Standard resistance (Check for short) 

   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   W (A53-24) or EFI (K31-8) - Body ground	10 kΩ or higher

4. Reconnect the combination meter connector.
5. Reconnect the ECM connector.
Fig 2: Identifying K31 And A53 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPAIR OR REPLACE COMBINATION METER ASSEMBLY 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Check if the MIL is illuminated when the power switch is turned on (IG).

OK: MIL should be illuminated. 

OK: SYSTEM OK 

NG: Go to next step 

1. Turn the power switch on (IG).
2. Start the engine.

Result 

B:  GO TO VC OUTPUT CIRCUIT 

A: Go to next step 

1. Check the MIL circuit (See MIL Circuit ).

NG: REPAIR OR REPLACE COMBINATION METER ASSEMBLY 

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