Inspection Procedure

1. Perform troubleshooting in accordance with the chart below.

   Result 

   DTC RESULT DESCRIPTION
   
   

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

B:  Go to step  4

A: Go TO NEXT STEP 

1. Connect an intelligent tester to the DLC3.
2. Turn the ignition switch ON.
3. Turn the tester ON.
4. Check whether any DTCs have been stored (See DTC CHECK/CLEAR  ). Note them down if necessary.
5. Clear DTCs (See DTC CHECK/CLEAR  ).
6. Check if the MIL turns off.

   OK: 

   MIL should turn off. 

OK: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS  (See DIAGNOSTIC TROUBLE CODE TABLE  )

NG: Go TO NEXT STEP 

1. Disconnect the E46 ECM connector.
   Fig 1: Identifying E46 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch ON.
3. Check that MIL is not illuminated.

   OK: 

   MIL is not illuminated. 

4. Reconnect the ECM connector.

OK: REPLACE ECM  (See REMOVAL  )

NG: CHECK AND REPAIR HARNESS AND CONNECTOR (COMBINATION METER - ECM) 

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

   OK: 

   MIL should be illuminated. 

OK: SYSTEM OK 

NG: Go TO NEXT STEP 

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

   Result 

   DTC RESULT DESCRIPTION
   
   

   Result	Proceed To
   Engine starts	A
   Engine does not start*	B
   HINT: *:An 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 HOW TO PROCEED WITH TROUBLESHOOTING ).

NG: REPAIR OR REPLACE BULB OR COMBINATION METER ASSEMBLY 

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