Inspection Procedure

1. Check if the ignition key being used is near other ignition keys. Also, check if the key ring is in contact with the key grip.
   Fig 1: Checking Ignition Key Position

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result: 

B: Go to step   3 

A: GO TO NEXT STEP. 

1. Separate the keys from each other and / or remove the key ring.
2. Clear the DTC (see DIAGNOSIS SYSTEM  ).
3. Insert a key into the ignition key cylinder. Remove it. Repeat for all other keys.
4. Check that no DTC is output.

   OK: No DTC is output. 

OK: END 

NG: GO TO NEXT STEP. 

1. Using an oscilloscope or the Techstream, check for noise in the waveform between the terminals of the E5 amplifier connector and E46 ECU connector.

   OK: No noise is present (see  Fig 2 ). 

   TRANSPONDER KEY ECU (NOISE)
   
   

   Tester Connection	Tool Setting	Tool Setting	Specified Condition
   E46-15 (CODE) - E5-4 (CODE)	5 V/DIV., 20 msec./DIV.	Key inserted	No noise is present

   Fig 2: Noise Waveform Graph Between Terminals Of E5 Amplifier And E46 ECU Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: FIND CAUSE OF NOISE AND REMOVE IT 

OK: GO TO NEXT STEP. 

1. Disconnect the E46 ECU connector.
2. Disconnect the E5 amplifier connector.
3. Measure the resistance of the wire harness side connectors.
   Fig 3: Identifying E46 ECU & E5 Amplifier Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   WIRE HARNESS (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)
   
   

   Tester Connection	Specified Condition
   E46-15 (CODE) - E5-4 (CODE)	Below 1 Ω
   E46-15 (CODE) or E5-4 (CODE) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: GO TO NEXT STEP. 

1. Temporarily replacing the transponder key amplifier with a new or normally functioning one.
2. Check that the engine starts normally.

   OK: Engine starts. 

NG: REPLACE TRANSPONDER KEY ECU 

OK: END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)