Inspection Procedure

1. Perform troubleshooting in accordance with the table below.

   Result 

   THAT MIL IS ILLUMINATED
   
   

   Condition	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. Check if DTCs have been stored (see DTC CHECK / CLEAR ). If DTCs are present, write them down.
4. Clear DTCs (see DTC CHECK / CLEAR ).
5. Check that the MIL turns OFF.

   Standard: 

   MIL turns OFF. 

NG: Go to step 3 

OK: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

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. 

4. Reconnect the ECM connector.
Fig 1: Identifying A24 Connector Terminals
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 (Check for open) 

   COMBINATION METER - ECM (CHECK FOR OPEN)
   
   

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

   Standard resistance (Check for short) 

   COMBINATION METER - ECM (CHECK FOR SHORT)
   
   

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

   Fig 2: Identifying J28 And A24 Connectors Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Reconnect the ECM connector.
5. Reconnect the combination meter connector.

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 

   THAT ENGINE STARTS
   
   

   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. See the combination meter troubleshooting procedure (See HOW TO PROCEED WITH TROUBLESHOOTING ).

NG: REPLACE COMBINATION METER ASSEMBLY  (See REMOVAL )

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