Inspection Procedure

1. Perform troubleshooting in accordance with the chart below.

   Result 

   MIL ILLUMMINATED
   
   

   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 to the DLC3.
2. Turn the ignition switch ON and turn the tester ON.
3. Check whether any DTCs have been stored (See DIAGNOSIS SYSTEM  ). Write them down if necessary.
4. Clear DTCs (See DTC CHECK/CLEAR  ).
5. Check if the MIL turns off.

   OK: MIL turns off. 

OK: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

NG: GO TO NEXT STEP 

1. Disconnect the E4 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: Checking Harness And Connector (Check For Short In Wire Harness)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE ECM 

NG: GO TO NEXT STEP 

1. Check the harness and connector (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).

OK: REPAIR OR REPLACE COMBINATION METER 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

   OK: MIL is illuminated. 

OK: SYSTEM OK 

NG: GO TO NEXT STEP 

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

   Result 

   ENGINE STARTS
   
   

   Condition	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 

1. See the combination meter troubleshooting procedure (See CUSTOMIZE PARAMETERS ).

NG: REPAIR OR REPLACE COMBINATION METER 

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