Inspection Procedure

1. Perform troubleshooting in accordance with the table below.

   Result 

   MIL IS ILLUMINATED
   
   

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

B:  Go to step  5

A: Go to next step 

1. Connect the intelligent tester or Techstream to the DLC3.
2. Turn the ignition switch ON and turn the tester ON.
3. Enter the following menus:
   1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
   2. Techstream - Select: 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.

   Standard: 

   MIL goes off 

NG: Go to step 3 

OK: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS  (see DIAGNOSTIC TROUBLE CODE CHART )

1. Disconnect the A24 ECM connector.
2. Turn the ignition switch ON.
3. Check that the MIL is not illuminated.

   OK: MIL is not illuminated. 

   Fig 1: Identifying A24 ECM Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 4 

OK: REPLACE ECM  (see REMOVAL  )

1. Disconnect the A24 ECM connector.
2. Disconnect the J28 combination meter connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   COMBINATION METER - ECM
   
   

   Tester Connection	Condition	Specified Condition
   A24-24 (W) or J28-5 (CHK) - Body ground	Always	10 kΩ or higher

   Fig 2: Identifying J28 Combination Meter Connector Terminal And A24 ECM Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE COMBINATION METER ASSEMBLY  (See REMOVAL )

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

   OK: MIL should be illuminated. 

NG: Go to step 6 

OK: SYSTEM OK 

1. Turn the ignition switch ON.
2. Start the engine.

   Result 

   ENGINE RESULT REFERENCE
   
   

   Result	Proceed to
   Engine starts	A
   Engine does not start*	B
   HINT: *: The intelligent tester or Techstream cannot communicate with the ECM.

B:  GO TO VC OUTPUT CIRCUIT 

A: Go to next step 

1. Disconnect the A24 ECM connector.
2. Disconnect the J28 combination meter connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   COMBINATION METER - ECM
   
   

   Tester Connection	Condition	Specified Condition
   A24-24 (W) - J28-5 (CHK)	Always	Below 1 Ω

   Fig 3: Identifying A24 ECM And J28 Combination Meter Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE COMBINATION METER ASSEMBLY  (See REMOVAL )