Engine does not Start but Initial Combustion Occurs [08/2015 - ]: Procedure

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .

NEXT: Go to next step 

1. Check for DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .

   Result

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

B → See step   15 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List.
5. Read the Data List according to the display on the Techstream.
   ENGINE AND ECT (ECM)
   
   

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

   OK

   OFF is displayed after the ignition switch is turned ON.

   Result

   Result	Proceed to
   NG	A
   OK	B

B → See step   16 

A: Go to next step 

1. Using a registered door control transmitter assembly, 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
   NG	A
   OK	B

B → See step   17 

A: Go to next step 

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (ECM)	*b	Component with harness connected (Transponder Key ECU Assembly)
   *c	Waveform 1	*d	Waveform 2
   *e	Approximately 160 ms	*f	Approximately 270 ms

   Measurement Condition

   Tester Connection	Condition	Tool Setting	Specified Condition
   A25-28 (IMI) - I19-13 (EFIO)	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	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform)

   Result

   Result	Proceed to
   Normal waveform	A
   Waveform 1 not output, or has abnormal wavelength or shape	B
   Waveform 2 not output, or has abnormal wavelength or shape	C

B → See step   12 

C → See step   13 

A: Go to next step 

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (ECM)	*b	Component with harness connected (Transponder Key ECU Assembly)
   *c	Waveform	*d	Approximately 160 ms
   *e	Approximately 270 ms	-	-

   Measurement Condition

   Tester Connection	Condition	Tool Setting	Specified Condition
   A25-29 (IMO) - I19-12 (EFII)	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	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform)

   Result

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

B → See step   9 

A: Go to next step 

1. Register the communication ID between the transponder key ECU assembly and ECM. Refer to REGISTRATION [08/2015 - ] .

NEXT: Go to next step 

1. Using a registered door control transmitter assembly, 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.

NG → See step   13 

OK → END (REGISTERED COMMUNICATION ID WAS DEFECTIVE) 

1. Temporarily replace the ECM with a new one. Refer to REMOVAL [08/2015 - ] .

NEXT: Go to next step 

1. Register the ECU communication ID. Refer to REGISTRATION [08/2015 - ] .

NEXT: Go to next step 

1. Using a registered door control transmitter assembly, 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.

NG → See step   16 

OK → END (ECM WAS DEFECTIVE) 

1. Disconnect the I19 transponder key ECU assembly connector.
2. Disconnect the A25 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I19-13 (EFIO) - A25-28 (IMI)	Always	Below 1 Ω
   I19-13 (EFIO) or A25-28 (IMI) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the transponder key ECU assembly with a new one. Refer to REMOVAL [08/2015 - ] .
   NOTE:

   Key ID code registration is necessary when replacing the transponder key ECU assembly, refer to Registration. Refer to REGISTRATION [08/2015 - ] .

NEXT: Go to next step 

1. Using a registered door control transmitter assembly, 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.

NG → See step   16 

OK → END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)