Engine Immobiliser System (For Hatchback) Engine Does Not Start Because No Initial Combustion

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

READ VALUE USING TECHSTREAM (IMMOBILISER FUEL CUT)

CHECK THEFT WARNING INDICATOR LIGHT OPERATION

CHECK THEFT WARNING INDICATOR LIGHT OPERATION

CHECK WHETHER ENGINE STARTS WITH OTHER KEYS

CHECK TRANSPONDER KEY AMPLIFIER (VC5 SIGNAL)

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU ASSEMBLY, IG TERMINAL VOLTAGE)

CHECK TRANSPONDER KEY AMPLIFIER (TXCT SIGNAL)

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU ASSEMBLY)

CHECK TRANSPONDER KEY AMPLIFIER (CODE SIGNAL)

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU ASSEMBLY)

REPLACE TRANSPONDER KEY AMPLIFIER

CHECK WHETHER ENGINE STARTS

REPLACE TRANSPONDER KEY ECU ASSEMBLY

REGISTER KEY

REGISTER ECU COMMUNICATION ID

CHECK WHETHER ENGINE STARTS

REPLACE KEY

REREGISTER KEY

CHECK WHETHER ENGINE STARTS

ENGINE IMMOBILISER SYSTEM (for Hatchback) - Engine does not Start because No Initial Combustion

DESCRIPTION

1. When the key is inserted into the ignition key cylinder, the antenna coil receives the key code. Then the amplifier amplifies the ID code and outputs it to the transponder key ECU assembly.
   
2. If this symptom occurs, there may be a communication problem between the transponder key amplifier and the transponder key ECU assembly.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. When replacing the key and transponder key ECU assembly, refer to the Registration (YARIS_NCP93 RM00000120Y021X.html).
   
2. Inspection the fuses for circuits related to this system before performing the following inspection procedure.
   

1.CLEAR DTC

1. Clear the DTCs (YARIS_NCP93 RM000001TCQ01OX.html).
   

NEXT

2.CHECK FOR DTC

1. Check for DTCs (YARIS_NCP93 RM000001TCQ01OX.html).
   

   HINT:

   Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

   Result

   Result	Proceed to
   No DTC output	A
   DTC output	B

B	GO TO DIAGNOSTIC TROUBLE CODE CHART (YARIS_NCP93 RM000001TCA01TX.html)

A

3.READ VALUE USING TECHSTREAM (IMMOBILISER FUEL CUT)

1. Turn the ignition switch off.
   

2. Connect the Techstream to the DLC3.
   

3. Turn the ignition switch to ON.
   

4. Turn the Techstream on.
   

5. Enter the following menus: Powertrain / Engine and ECT / Data List.
   
   

   Engine and ECT

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Immobiliser Fuel Cut	Status of immobiliser fuel cut/ ON or OFF	-	-

   OK:

   The item in the Data List indicates "OFF"
   

   Result

   Result	Proceed to
   NG	A
   OK	B

B	GO TO SFI SYSTEM (YARIS_NCP93 RM000000PD90QDX.html)

A

4.CHECK THEFT WARNING INDICATOR LIGHT OPERATION

1. When the key inserted in ignition key cylinder, check that the theft warning indicator light assembly off.
   

   OK:

   The theft warning indicator light assembly off.
   

NG	Go to step 5

OK
GO TO ENGINE DOES NOT START BUT INITIAL COMBUSTION OCCURS (YARIS_NCP93 RM000004UHH005X.html)

5.CHECK THEFT WARNING INDICATOR LIGHT OPERATION

1. Perform inspection using a different key that has been registered to the vehicle.
   

2. When the key inserted in ignition key cylinder, check that the theft warning indicator light assembly off.
   

   OK:

   The theft warning indicator light assembly off.
   

NG	Go to step 7

OK

6.CHECK WHETHER ENGINE STARTS WITH OTHER KEYS

1. Perform inspection using a different key that has been registered to the vehicle.
   

2. It leaves for 5 seconds by the ignition switch ON status, and the engine starting operation is done.
   

   Result

   Result	Proceed to
   Engine can not be started	A
   Engine can be started	B

B	Go to step 19

A
GO TO ENGINE DOES NOT START BUT INITIAL COMBUSTION OCCURS (YARIS_NCP93 RM000004UHH005X.html)

7.CHECK TRANSPONDER KEY AMPLIFIER (VC5 SIGNAL)

1. Disconnect the D140 transponder key amplifier connector.
   

2. Using an oscilloscope, check the waveform.
   

   1. Waveform
      

      Measurement Condition

      Item	Content
      Tester Connection	D140-1 (VC5) - Body ground
      Tool Setting	1 V/DIV., 20 ms./DIV.
      Condition	Key inserted in ignition key cylinder

      OK:

      Waveform is output normally (refer to illustration).
      

      Text in Illustration

      *a	Front view of wire harness connector (to Transponder Key Amplifier)
      *b	Waveform

NG	Go to step 8

OK
REPLACE TRANSPONDER KEY ECU ASSEMBLY (YARIS_NCP93 RM000004E7M008X.html)

8.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU ASSEMBLY, IG TERMINAL VOLTAGE)

1. Disconnect the D140 transponder key amplifier connector.
   

2. Disconnect the D139 transponder key ECU assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   D140-1 (VC5) - D139-14 (VC5)	Always	Below 1 Ω
   D140-7 (AGND) - D139-5 (AGND)	Always	Below 1 Ω
   D140-1 (VC5) - Body ground	Always	10 kΩ or higher

4. Reconnect the transponder key amplifier connector.
   

5. Measure the voltage according to the value(s) in the table below.
   

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   D139-2 (IG) - D139-16 (GND)	Ignition switch ON	11 to 14 V

   Text in Illustration

   *a	Front view of wire harness connector (to Transponder Key ECU assembly)

   Result

   Result	Proceed to
   OK	A
   NG (Wire harness or connector)	B
   NG (IG terminal voltage)	C

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.CHECK TRANSPONDER KEY AMPLIFIER (TXCT SIGNAL)

1. Disconnect the D140 transponder key amplifier connector.
   

2. Using an oscilloscope, check the waveform.
   

   1. Waveform
      

      Measurement Condition

      Item	Content
      Tester Connection	D140-5 (TXCT) - Body ground
      Tool Setting	1 V/DIV., 20 ms./DIV.
      Condition	Key inserted in ignition key cylinder

      OK:

      Waveform is output normally (refer to illustration).
      

      Text in Illustration

      *a	Front view of wire harness connector (to Transponder Key Amplifier)
      *b	Waveform

NG	Go to step 10

OK
REPLACE TRANSPONDER KEY ECU ASSEMBLY (YARIS_NCP93 RM000004E7M008X.html)

10.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU ASSEMBLY)

1. Disconnect the D140 transponder key amplifier connector.
   

2. Disconnect the D139 transponder key ECU assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   D140-5 (TXCT) - D139-4 (TXCT)	Always	Below 1 Ω
   D140-5 (TXCT) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

11.CHECK TRANSPONDER KEY AMPLIFIER (CODE SIGNAL)

1. Disconnect the D140 transponder key amplifier connector.
   

2. Using an oscilloscope, check the waveform.
   

   1. Waveform
      

      Measurement Condition

      Item	Content
      Tester Connection	D140-4 (CODE) - Body ground
      Tool Setting	1 V/DIV., 20 ms./DIV.
      Condition	Key inserted in ignition key cylinder

      OK:

      Waveform is output normally (refer to illustration).
      

      Text in Illustration

      *a	Front view of wire harness connector (to Transponder Key Amplifier)
      *b	Waveform

NG	Go to step 12

OK
REPLACE TRANSPONDER KEY ECU ASSEMBLY (YARIS_NCP93 RM000004E7M008X.html)

12.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU ASSEMBLY)

1. Disconnect the D140 transponder key amplifier connector.
   

2. Disconnect the D139 transponder key ECU assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   D140-4 (CODE) - D139-15 (CODE)	Always	Below 1 Ω
   D140-4 (CODE) - Body ground	Always	10 kΩ or higher

4. Reconnect the transponder key ECU assembly connector.
   

5. Reconnect the transponder key amplifier connector.
   

6. Using an oscilloscope, check the waveform.
   

   1. Waveform
      

      Measurement Condition

      Item	Content
      Tester Connection	D140-4 (CODE) - Body ground
      Tool Setting	1 V/DIV., 20 ms./DIV.
      Condition	Key inserted in ignition key cylinder

      OK:

      Waveform is output normally (refer to illustration).
      

      Text in Illustration

      *a	Front view of wire harness connector (to Transponder Key Amplifier)
      *b	Waveform

      Result

      Result	Proceed to
      Terminal CODE stuck high (5 V)	A
      Terminal CODE stuck low (1 V or less)	B
      Problem in wire harness or connector	C

B	Go to step 15
C	REPAIR OR REPLACE HARNESS OR CONNECTOR

A

13.REPLACE TRANSPONDER KEY AMPLIFIER

1. Replace the transponder key amplifier (YARIS_NCP93 RM000003RZI00HX.html).
   

NEXT

14.CHECK WHETHER ENGINE STARTS

1. Check that the engine starts with an already registered vehicle key.
   

   OK:

   Engine starts normally.
   

NG	Go to step 15

OK
END (TRANSPONDER KEY AMPLIFIER WAS DEFECTIVE)

15.REPLACE TRANSPONDER KEY ECU ASSEMBLY

1. Replace the transponder key ECU assembly with a new one (YARIS_NCP93 RM000004E7M008X.html).
   

NEXT

16.REGISTER KEY

1. Register the key (YARIS_NCP93 RM00000120Y021X.html).
   

NEXT

17.REGISTER ECU COMMUNICATION ID

1. Register the ECU communication ID (YARIS_NCP93 RM00000120Y021X.html).
   

NEXT

18.CHECK WHETHER ENGINE STARTS

1. Check that the engine starts with an already registered vehicle key.
   

   OK:

   Engine starts normally.
   

NG	Go to step 19

OK
END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

19.REPLACE KEY

1. Replace the transponder key master transmitter with a new one (YARIS_NCP93 RM00000120Y021X.html).
   

NEXT

20.REREGISTER KEY

1. Reregister the key (YARIS_NCP93 RM00000120Y021X.html).
   

NEXT

21.CHECK WHETHER ENGINE STARTS

1. Check that the engine starts with an already registered vehicle key.
   

   OK:

   Engine starts normally.
   

NG	GO TO SFI SYSTEM (YARIS_NCP93 RM000000PD90QDX.html)

OK
END (KEY (TRANSPONDER KEY MASTER TRANSMITTER) WAS DEFECTIVE)