Inspection Procedure

1. Check if the ignition key being used is near other ignition keys, as shown in the illustration. Also, check if the key ring is in contact with the key grip.

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   The key is near other keys and/or the key ring is in contact with the key grip.	A
   The key is not near other keys and/or the key ring is hot in contact with the key grip.	B

   Fig 1: Identifying Keys

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B:  Go to step  3

A: Go to next step. 

1. Separate the keys from each other and/or remove the key ring.
2. Delete the DTC (See DIAGNOSTIC TROUBLE CODE CHART  ).
3. Insert a key into the ignition cylinder. Remove it. Repeat for all the other keys.
4. Check that no code is output.

   OK: No code is output. 

NG: Go to step 3 

OK: END (INSPECTION FINISHED) 

1. Using an oscilloscope or the Techstream, check for noise in the waveform between the terminals of the D24 transponder key amplifier connector and D23 transponder key ECU connector.

   Result 

   RESULT CHART
   
   

   Tester Connection	Specified Condition
   D23-15 (CODE) - D24-4 (CODE)	No noise is occur

   WAVEFORM REFERENCE
   
   

   Tool Setting	5 V/DIV., 20 ms/DIV.
   Condition	Ignition switch OFF → ON

   Fig 2: Transponder Key ECU Assembly Waveform Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: FIND CAUSE OF NOISE AND REMOVE IT 

OK: Go to next step. 

1. Disconnect the D23 transponder key ECU connector.
Fig 3: Identifying Transponder Key ECU And Transponder Key Amplifier Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D24 transponder key amplifier connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   D23-15 (CODE) - D24-4 (CODE)	Below 1 Ω

4. Reconnect the D23 transponder key ECU connector.
5. Reconnect the D24 transponder amplifier connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step. 

1. After replacing the transponder key amplifier with a normally functioning amplifier, check that the engine starts.

   OK: Engine starts. 

NG: REPLACE TRANSPONDER KEY ECU ASSEMBLY 

OK: END (TRANSPONDER KEY AMPLIFIER DEFECTIVE)