Toyota Corolla Cross: Engine does not Start

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function, Gasoline Model) / Engine does not Start

DESCRIPTION

When the electrical key transmitter sub-assembly is in the cabin and the engine switch is pressed, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode. Additionally, when the shift lever is in P and the brake pedal is depressed, the engine can be started by pressing the engine switch.

Related Data List and Active Test Items

Problem Symptom	Data List and Active Test
Engine does not start	Power Source Control Stop Light Switch Shift P Signal Starter Relay Driving Request (Starting Control) Shift P/N (Starting Control) Entry&Start Immobiliser Start Request L Code Check S Code Check

Problem Symptom

Data List and Active Test

Engine does not start

Power Source Control

Stop Light Switch
Shift P Signal
Starter Relay Driving Request (Starting Control)
Shift P/N (Starting Control)

Entry&Start

Immobiliser
Start Request
L Code Check
S Code Check

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key System. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
If the smart key system (for Start Function) has been disabled, enable the system before performing troubleshooting.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.
Before replacing the certification ECU (smart key ECU assembly) or an electrical key transmitter sub-assembly, refer to Registration.
Click here
After completing repairs, confirm that the problem does not recur.
After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation."

PROCEDURE

1.	CHECK WHETHER ENGINE STARTS

(a) Using an electrical key transmitter sub-assembly which is registered to the vehicle, turn the ignition switch to ON.

(b) Check that the engine can be started 5 seconds after the ignition switch turned to ON.

OK:

Engine starts normally.

CHECK VEHICLE CONTROL HISTORY (ROB)

2.	CHECK SECURITY INDICATOR LIGHT (IMMOBILISER FUNCTION UNSET)

(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.

(b) Move the shift lever to P.

(c) Press the engine switch with the brake pedal released and check that the security indicator light changes from blinking to off at the same time that the power source mode changes to ACC.

OK:

The security indicator light changes from blinking to off at the same time that the power source mode changes to ACC.

HINT:

The immobiliser function can be determined to be operating correctly if the security indicator light changes from blinking to off at the same time that the power source mode changes to ACC.

GO TO OTHER PROBLEM (Immobiliser System does not Operate Properly)

3.	CHECK FOR DTC

(a) Using the GTS, check if LIN communication DTC B278588 and B278987 are output.

Body Electrical > Smart Key > Trouble Codes

OK:

DTC B278588 and B278987 are not output.

GO TO LIN COMMUNICATION SYSTEM (DTC B278588)

4.	CHECK ENGINE CRANKING OPERATION

(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.

(b) Move the shift lever to P.

(c) Check that the key indicator display is displayed on the multi-information display in the combination meter assembly, and then press the engine switch and check that the engine cranks.

Result	Proceed to
Engine cranks and initial combustion occurs	A
Engine cranks but initial combustion does not occur	B
Engine does not crank	C

GO TO OTHER PROBLEM (Immobiliser System does not Operate Properly)

GO TO SFI SYSTEM

5.	CHECK ENGINE SWITCH CONDITION

(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.

(b) Move the shift lever to P.

Result	Proceed to
Power source mode changes : Off → ACC → ON → off	A
Power source mode does not change to ACC or ON	B
Power source mode changes to ON but not to ACC	C
Power source mode changes to ACC but not to ON	D

GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (IG and ACC))

GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (ACC))

GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (IG))

6.	READ VALUE USING GTS (STOP LIGHT SWITCH)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Power Source Control > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Stop Light Switch	State of brake pedal	OFF or ON	OFF: Brake pedal released ON: Brake pedal depressed	Use this item to determine if the stop light switch assembly is malfunctioning. The engine cannot be started when this item is OFF. If the stop light switch assembly is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light Switch

State of brake pedal

OFF or ON

OFF: Brake pedal released

ON: Brake pedal depressed

Use this item to determine if the stop light switch assembly is malfunctioning.
The engine cannot be started when this item is OFF.
If the stop light switch assembly is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.

Body Electrical > Power Source Control > Data List

Tester Display
Stop Light Switch

OK:

The GTS display changes correctly in response to the brake pedal operation.

GO TO STEP 26

7.	READ VALUE USING GTS (SHIFT P SIGNAL)

(a) Move the shift lever to P.

(b) Read the Data List according to the display on the GTS.

Body Electrical > Power Source Control > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Shift P Signal	Shift position P	OFF or ON	OFF: Shift lever not in P ON: Shift lever in P	Use this item to determine if the shift position switch is malfunctioning. The engine cannot be started when this item is OFF.

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Shift P Signal

Shift position P

OFF or ON

OFF: Shift lever not in P

ON: Shift lever in P

Use this item to determine if the shift position switch is malfunctioning.
The engine cannot be started when this item is OFF.

Body Electrical > Power Source Control > Data List

Tester Display
Shift P Signal

OK:

ON is displayed on the GTS.

GO TO STEP 23

8.	READ VALUE USING GTS (SHIFT P/N (STARTING CONTROL))

(a) Read the Data List according to the display on the GTS.

Body Electrical > Power Source Control > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Shift P/N (Starting Control)	Park/Neutral position switch status	OFF or ON	OFF: Shift lever not in P or N ON: Shift lever in P or N	When OFF is displayed, the engine will not crank.

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Shift P/N (Starting Control)

Park/Neutral position switch status

OFF or ON

OFF: Shift lever not in P or N

ON: Shift lever in P or N

When OFF is displayed, the engine will not crank.

Body Electrical > Power Source Control > Data List

Tester Display
Shift P/N (Starting Control)

OK:

The GTS display changes correctly in response to the shift lever or brake pedal operation.

GO TO STEP 17

9.	READ VALUE USING GTS (POWER SUPPLY CONDITION)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Power Source Control > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Power Supply Condition	Power supply state	OFF, ACC ON, IGR ON, IGP ON or Starter ON	OFF: Ignition switch off ACC ON: Ignition switch ACC IGR ON: Ignition switch ON IGP ON: Ignition switch ON Starter ON: Sending engine start request signal	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Power Supply Condition

Power supply state

OFF, ACC ON, IGR ON, IGP ON or Starter ON

OFF: Ignition switch off

ACC ON: Ignition switch ACC

IGR ON: Ignition switch ON

IGP ON: Ignition switch ON

Starter ON: Sending engine start request signal

Body Electrical > Power Source Control > Data List

Tester Display
Power Supply Condition

NOTICE:

Check that the key indicator display is displayed on the multi-information display in the combination meter assembly, and then press the engine switch.

OK:

The GTS display changes correctly in response to the engine switch operation.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

10.	READ VALUE USING GTS (STARTER RELAY DRIVING REQUEST (STARTING CONTROL))

(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.

(b) Move the shift lever to P.

(c) According to the display on the GTS, read the Data List while pressing the engine switch with the brake pedal depressed.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Starter Relay Driving Request (Starting Control)

Engine start request signal status

OFF or ON

OFF: The engine switch is not pressed

ON: With the shift lever in P and the brake pedal depressed, the engine switch is pressed and held

When the engine cannot be started due to a start request signal malfunction, OFF is displayed.
When the engine switch is pressed, the duration of time that ON is displayed will be extremely short. As such, the engine switch needs to be pressed and held for a certain period of time.

Body Electrical > Power Source Control > Data List

Tester Display
Starter Relay Driving Request (Starting Control)

OK:

The GTS display changes.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

11.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
No. 1 engine room relay block assembly ST relay terminal 2 - Body ground	Engine switch pressed and held with brake pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off)	6 V or higher* → 1.0 V or less

HINT:

*: While the engine is cranking, the auxiliary battery voltage may drop to approximately 6 V.

*1	No. 1 Engine Room Relay Block Assembly (ST Relay Holder)

GO TO STEP 16

12.	CHECK HARNESS AND CONNECTOR (ST RELAY - AUXILIARY BATTERY AND GROUND)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
No. 1 engine room relay block assembly ST relay terminal 1 - Body ground	Always	Below 1 Ω

*1	No. 1 Engine Room Relay Block Assembly (ST Relay Holder)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
No. 1 engine room relay block assembly ST relay terminal 5 - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.	INSPECT ST RELAY

Click here

REPLACE ST RELAY

14.	CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - ST RELAY)

(a) Disconnect the C132 starter assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
No. 1 engine room relay block assembly ST relay terminal 3 - C135-2	Always	Below 1 Ω
No. 1 engine room relay block assembly ST relay terminal 3 or C135-2 - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

15.	CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - AUXILIARY BATTERY)

(a) Disconnect the C137 starter assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
C137-1 (B) - Body ground	Always	11 to 14 V

REPLACE STARTER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.	CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ST RELAY)

(a) Disconnect the C62 park/neutral position switch connector.

(b) Disconnect the A169 engine stop and start ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C62-5 (L) - 2 (ST relay)	Always	Below 1 Ω
C62-5 (L) or 2 (ST relay) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

17.	READ VALUE USING GTS (NEUTRAL SW/ CLUTCH SW)

(a) Disconnect the A47 ECM connector.

(b) Read the Data List according to the display on the GTS.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Neutral Switch / Clutch Switch

Shift position (P and N)

OFF or ON

OFF: Shift lever in any position other than P or N

ON: Shift lever in P or N

Use this item to determine if the park/neutral position switch is malfunctioning.
When the engine cannot be started due to a park/neutral position switch malfunction, OFF is displayed.

Body Electrical > Power Source Control > Data List

Tester Display
Neutral Switch / Clutch Switch

OK:

The GTS display changes correctly in response to the shift lever or brake pedal operation.

REPLACE ECM

18.	READ VALUE USING GTS (NEUTRAL SW/ CLUTCH SW)

(a) Disconnect the A169 engine stop and start ECU connector.

(b) Read the Data List according to the display on the GTS.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Neutral Switch / Clutch Switch

Shift position (P and N)

OFF or ON

OFF: Shift lever in any position other than P or N

ON: Shift lever in P or N

Use this item to determine if the park/neutral position switch is malfunctioning.
When the engine cannot be started due to a park/neutral position switch malfunction, OFF is displayed.

Body Electrical > Power Source Control > Data List

Tester Display
Neutral Switch / Clutch Switch

OK:

The GTS display changes correctly in response to the shift lever operation.

REPLACE ENGINE STOP AND START ECU

19.	INSPECT PARK/NEUTRAL POSITION SWITCH

for 2WD: Click here

for AWD: Click here

REPLACE PARK/NEUTRAL POSITION SWITCH

for 2WD: Click here

for AWD: Click here

20.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH)

(a) Disconnect the I223 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the C62 park/neutral position switch connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I223-3 (STA) - C62-5 (L)	Always	Below 1 Ω
I223-3 (STA) - A169-21 (STA)	Always	Below 1 Ω
I223-10 (STAR) - A47-23 (NSW)	Always	Below 1 Ω
I223-10 (STAR) - C62-4 (B)	Always	Below 1 Ω
I223-10 (STAR) - A169-17 (CLL)	Always	Below 1 Ω
I223-3 (STA) or C62-5 (L) - Other terminals and body ground	Always	10 kΩ or higher
I223-10 (STAR) or A47-23 (NSW) - Other terminals and body ground	Always	10 kΩ or higher
I223-10 (STAR) or C62-4 (B) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

21.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Connect the I223 certification ECU (smart key ECU assembly) connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
I223-10 (STAR) - Body ground	Engine switch pressed and held with brake pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off)	6 V or higher* → 1.0 V or less

HINT:

*: While the engine is cranking, the auxiliary battery voltage may drop to approximately 6 V.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

22.	INSPECT ST RELAY

Click here

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPLACE ST RELAY

23.	CHECK SHIFT LOCK CONTROL UNIT ASSEMBLY

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
I222-14 (P) - Body ground	Shift position P → Shift position not P	9V or higher → 2.76 V or less

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

24.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - SHIFT LOCK CONTROL UNIT ASSEMBLY)

(a) Disconnect the I222 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the I18 shift lock control unit assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I222-14 (P) - I18-3 (P2)	Always	Below 1 Ω
I222-14 (P) or I18-3 (P2) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

25.	CHECK SHIFT LOCK CONTROL UNIT ASSEMBLY

(a) Reconnect the I222 certification ECU (smart key ECU assembly) connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
I222-14 (P) - Body ground	Shift position P	9 V or higher

Result	Proceed to
OK	A
NG	B

REPLACE SHIFT CONTROL UNIT ASSEMBLY

for 2WD: Click here

for AWD: Click here

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

26.	CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - AUXILIARY BATTERY AND GROUND)

(a) Disconnect the A53 stop light switch assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A53-7 (B) - Body ground	Always	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
A53-2 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

27.	INSPECT STOP LIGHT SWITCH ASSEMBLY

Click here

REPLACE STOP LIGHT SWITCH ASSEMBLY

28.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY)

(a) Disconnect the I223 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the A53 stop light switch assembly connector.

(d) Disconnect the A151 skid control ECU (brake actuator assembly) connector.

(e) Disconnect the C80 transmission control ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I223-21 (STP1) - A53-3 (L)	Always	Below 1 Ω
I223-21 (STP1) or A53-3 (L) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

SEE MORE:

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Toyota Corolla Cross: Engine does not Start

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Power Source Mode does not Change to ON (IG and ACC)

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SEE MORE:

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