IMMOBILISER SYSTEM(w/o Smart Entry and Start System) Engine does not Start but Initial Combustion Occurs

DESCRIPTION

If the key ID codes of the key and transponder key ECU assembly match, the immobiliser system is unset and the engine start permission signal is sent to the ECM. When the ID codes of the transponder key ECU assembly and ECM match, the engine starts.

WIRING DIAGRAM

*1	Transponder Key ECU Assembly

CAUTION / NOTICE / HINT

PROCEDURE

1. CLEAR DTC

   
   

   1. Clear the DTCs.

      Click here

      
      Body Electrical > Immobiliser > Clear DTCs
      Powertrain > Engine > Clear DTCs

      Result
      Proceed to NEXT

   
   

   NEXT

2. CHECK FOR DTC

   
   

   1. Check for DTCs.

      Click here

      
      Body Electrical > Immobiliser > Trouble Codes
      Powertrain > Engine > Trouble Codes

      OK
      DTC is not output.

      Result
      Result Proceed to DTCs are not output A DTCs are output B

   
   

   B

   GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

   A

3. CHECK WHETHER ENGINE STARTS

   
   

   1. Using a registered key, turn the ignition switch to ON.

   2. Check that the engine starts 5 seconds after the ignition switch was turned to ON.

      OK
      Engine starts normally.

      Result
      Proceed to OK NG

   
   

   OK

   USE SIMULATION METHOD TO CHECK Click here

   NG

4. CHECK ECM (TERMINAL IMI)

   
   

   1. Using an oscilloscope, check the waveform.

      

      *a

      Component with harness connected (ECM)

      *b

      Waveform A

      Item	Content
      Terminal No. (Symbol)	G50-16 (IMI) - Body ground
      Tool Setting	2 V/DIV., 500 ms./DIV.
      Condition	Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

      OK
      Waveform is output normally (refer to illustration)

      Result
      Result Proceed to Normal waveform A Waveform A not output, or has abnormal wavelength or shape B

   
   

   B

   CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM) Click here

   A

5. CHECK ECM (TERMINAL IMO)

   
   

   1. Using an oscilloscope, check the waveform.

      

      *a	Component with harness connected (ECM)	*b	Waveform B
      *c	Approximately 160 ms	*d	Approximately 270 ms

      Item	Content
      Terminal No. (Symbol)	G50-17 (IMO) - Body ground
      Tool Setting	2 V/DIV., 500 ms./DIV.
      Condition	Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

      OK
      Waveform is output normally (refer to illustration)

      Result
      Result Proceed to Normal waveform A Waveform B not output, or has abnormal wavelength or shape B

   
   

   B

   REPLACE ECM Click here

   A

6. CHECK ECM (TERMINAL IMI)

   
   

   1. Using an oscilloscope, check the waveform.

      

      *a	Component with harness connected (ECM)	*b	Waveform C
      *c	Approximately 160 ms	*d	Approximately 270 ms

      Item	Content
      Terminal No. (Symbol)	G50-16 (IMI) - Body ground
      Tool Setting	2 V/DIV., 500 ms./DIV.
      Condition	Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

      OK
      Waveform is output normally (refer to illustration)

      Result
      Result Proceed to Normal waveform A Waveform C not output, or has abnormal wavelength or shape B

   
   

   B

   GO TO STEP 9 Click here

   A

7. REGISTER ECU COMMUNICATION ID

   
   

   1. Register the communication ID between the transponder key ECU assembly and ECM.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to NEXT

   
   

   NEXT

8. CHECK WHETHER ENGINE STARTS

   
   

   1. Using a registered key, turn the ignition switch to ON.

   2. Check that the engine starts 5 seconds after the ignition switch was turned to ON.

      OK
      Engine starts normally.

      Result
      Proceed to OK NG

   
   

   OK

   END (REGISTERED COMMUNICATION ID WAS DEFECTIVE)

   NG

9. REPLACE TRANSPONDER KEY ECU ASSEMBLY

   
   

   1. Replace the transponder key ECU assembly with a new one.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to NEXT

   
   

   NEXT

10. REGISTER KEY

    
    

    1. Register the key.

       Tech Tips

       Refer to Service Bulletin.

       Result
       Proceed to NEXT

    
    

    NEXT

11. REGISTER ECU COMMUNICATION ID

    
    

    1. Register the ECU communication ID.

       Tech Tips

       Refer to Service Bulletin.

       Result
       Proceed to NEXT

    
    

    NEXT

12. CHECK WHETHER ENGINE STARTS

    
    

    1. Using a registered key, turn the ignition switch to ON.

    2. Check that the engine starts 5 seconds after the ignition switch was turned to ON.

       OK
       Engine starts normally.

       Result
       Result Proceed to OK A NG B

    
    

    A

    END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

    B

    GO TO ECD SYSTEM Click here

13. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)

    
    

    1. Disconnect the G127 transponder key ECU assembly connector.

    2. Disconnect the G50 ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance
       Tester Connection Condition Specified Condition G127-13 (EFIO) - G50-16 (IMI) Always Below 1 Ω G127-13 (EFIO) - Body ground Always 10 kΩ or higher G50-16 (IMI) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR