Toyota Venza: Engine does not Start

DESCRIPTION

1. ENGINE START SYSTEM FUNCTION

(a) If the engine switch is pressed with the shift lever in P or N and the brake pedal depressed, the power management control ECU determines that this is an engine start request.

(b) The certification ECU (smart key ECU assembly) and other ECUs perform key verification via LIN communication.

(c) The power management control ECU activates the ACC relay.

(d) The power management control ECU activates the IG1 and IG2 relays.

(e) The certification ECU (smart key ECU assembly) outputs a steering UNLOCK signal. The signal is sent to the power management control ECU via the steering lock ECU.

(f) The power management control ECU activates the starter relay.

HINT:

When the power management ECU operates the starter relay, it performs cranking holding control.

(g) The power management control ECU deactivates the ACC relay until the power management control ECU detects an engine start.

HINT:

Whether the engine has started is judged based on the engine speed signals sent from the ECM.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

1. EMERGENCY ENGINE START CONTROL

(a) If there is a malfunction in the stop light switch or STOP fuse, their signals may not be correctly transmitted to the power management control ECU. This may result in the engine not starting even if the engine switch is pressed while the brake pedal is depressed and the shift lever is in P.

To activate the starter:

(1) Turn the engine switch from off to on (ACC).

(2) Press and hold the engine switch for 15 seconds.

HINT:

After the certification ECU (smart key ECU assembly), steering lock ECU, and/or ECM are/is replaced, perform the registration procedure for the engine immobiliser system (See page ).

PROCEDURE

1.	CHECK IF ENGINE STARTS

(a) Place the electrical key on the driver seat.

(b) Move the shift lever to P.

(c) Depress the brake pedal.

(d) Check that the engine switch indicator light is green. Then press the engine switch to check if the engine starts.

OK:

Engine can be started.

OK

END (ENGINE START PERMISSION CONDITIONS WERE NOT SATISFIED)

NG

2.	CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / each ECU / Trouble Code.

(e) Check for DTCs.

OK:

DTC is not output.

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART

OK

3.	READ VALUE USING TECHSTREAM

(a) Enter the following menus: Body Electrical / Smart key / Data List.

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

Smart Key

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Power Supply Open	Open in ECU/NG (PAST) or OK	NG (Past): Open in ECU OK: No malfunction	-

OK:

OK (No malfunction) appears on the screen.

NG

GO TO STEERING LOCK SYSTEM

OK

4.	CHECK POWER SOURCE CONDITION

(a) Check if the power source mode changes.

(1) When the key is inside the vehicle and the shift lever is in P, check that the power source mode changes.

Result	Proceed to
OK: off → on (ACC) → on (IG) → off	A
Power source mode does not change to on (IG and ACC)	B
Power source mode does not change to on (IG)	C
Power source mode does not change to on (ACC)	D

B

GO TO DIAGNOSIS PROCEDURE (Power Source Mode does not Change to ON (IG and ACC))

C

GO TO DIAGNOSIS PROCEDURE (Power Source Mode does not Change to ON (IG))

D

GO TO DIAGNOSIS PROCEDURE (Power Source Mode does not Change to ON (ACC))

A

5.	CHECK CRANKING FUNCTION

(a) Check the engine cranking function.

(1) When there is fuel in the fuel tank, the key is inside the vehicle, and the shift lever is in P, check that depressing the brake pedal and pressing the engine switch cranks the engine.

Result	Proceed to
Engine does not cranks.	A
Engine cranks (for 2GR-FE).	B
Engine cranks (for 1AR- FE).	C

B

GO TO SFI SYSTEM (for 2GR-FE)

C

GO TO SFI SYSTEM (for 1AR-FE)

A

6.	INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

(a) Disconnect the B2 connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
B2-4 (B) - B2-9 (L)	Shift lever in P or N	Below 1 Ω
B2-4 (B) - B2-9 (L)	Shift lever not in P or N	10 kΩ or higher

Text in Illustration

*1	Components without harness connected (Park/neutral Position Switch Assembly)

NG

GO TO STEP 20

OK

7.	INSPECT STARTER RELAY ASSEMBLY

(a) Remove the ST relay from the engine room relay block.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 - 5	Battery voltage not applied to terminals 1 and 2	10 kΩ or higher
3 - 5	Battery voltage applied to terminals 1 and 2	Below 1 Ω

NG

GO TO STEP 20

OK

8.	CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

(a) Disconnect the D42 connector from the power management control ECU.

(b) The shift lever is in P or N.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D42-3 (STAR) - Body ground	Always	93.8 to 136.4 Ω

Text in Illustration

*1	Front view of wire harness connector (to Power Management Control ECU)

NG

GO TO STEP 20

OK

9.	READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY)

(a) Enter the following menus: Body Electrical / Power Source Control / Data List.

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

Power Source Control

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Stop Light Switch1	Stop light switch 1/ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

OK:

ON (brake pedal depressed) and OFF (brake pedal released) appear on the screen.

NG

GO TO STEP 16

OK

10.	READ VALUE USING TECHSTREAM (STEERING UNLOCK SWITCH)

(a) Enter the following menus: Body Electrical / Power Source Control / Date List.

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

Power Source Control

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Steering Unlock Switch	Steering unlock condition/ON or OFF	ON: Steering is unlocked OFF: Steering is locked	-

OK:

ON (steering is unlocked) and OFF (steering is unlocked) appear on the screen.

NG

GO TO STEP 18

OK

11.	CHECK STEERING LOCK

(a) Turn the engine switch from off to on (ACC) and check that the steering lock moves to the unlocked position when the engine switch is on (ACC).

OK:

Lock moves to unlocked position.

NG

GO TO STEERING LOCK SYSTEM

OK

12.	READ VALUE USING TECHSTREAM (L CODE)

(a) Enter the following menus: Body Electrical / Smart Key / Data List.

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

Smart Key

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
L Code Check	L code certification result/OK or NG	OK: L code certification result normal NG: L code certification result abnormal	-

OK:

OK appear on the screen.

NG

GO TO ENGINE IMMOBILISER SYSTEM

OK

13.	READ VALUE USING TECHSTREAM (ENGINE START REQUEST)

(a) Enter the following menus: Body Electrical / Smart key / Data List.

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

Smart Key

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Engine Start Request	Start request signal response/OK or NG	OK: Start request condition signal received NG: Start request condition signal not received	-

OK:

OK appear on the screen.

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

14.	READ VALUE USING TECHSTREAM (S CODE)

(a) Enter the following menus: Body Electrical / Smart key / Data List.

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

Smart Key

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
S Code Check	S code certification result/OK or NG	OK: S code certification result normal NG: S code certification result abnormal	-

OK:

OK (S code certification result normal) appears on the screen.

NG

GO TO ENGINE IMMOBILISER SYSTEM

OK

15.	READ VALUE USING TECHSTREAM (STARTER REQUEST SIGNAL)

(a) Enter the following menu: Body Electrical / Power Source Control / Data List.

(b) Read the Data List according to the value(s) in the table below.

Power Source Control

Tester Display	Measurement Item/Range	Normal Condition	Specified Condition
Starter Request Signal	Starter request signal monitor/ON or OFF	ON: ST relay is ON OFF: ST relay is OFF	Engine switch pressed and held with shift lever in P or N

Result	Proceed to
ON (ST relay on) and OFF (ST relay off) do not appear on the screen.	A
ON (ST relay on) and OFF (ST relay off) appear on the screen (for 2GR-FE).	B
ON (ST relay on) and OFF (ST relay off) appear on the screen (for 1AR-FE).	C

A

REPLACE POWER MANAGEMENT CONTROL ECU

B

GO TO SFI SYSTEM (for 2GR-FE)

C

GO TO SFI SYSTEM (for 1AR-FE)

16.	INSPECT STOP LIGHT SWITCH ASSEMBLY

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

OK

17.	CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the D42 connector from the power management control ECU.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D42-10 (STP1) - A35-1	Always	Below 1 Ω
D42-10 (STP1) - Body ground	Always	10 kΩ or higher

Text in Illustration

*1

Front view of wire harness connector (to Power Management Control ECU)

*2

Front view of wire harness connector (to Stop Light Switch Assembly)

(c) Reconnect the D42 connector to the power management control ECU.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
D42-10 (STP1) - Body ground	Brake pedal released	Below 1 V
D42-10 (STP1) - Body ground	Brake pedal depressed	Output voltage at terminal AM21 or AM22 -2.5 V or more

OK

REPLACE POWER MANAGEMENT CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

18.	CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - STEERING LOCK ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

19.	INSPECT STEERING LOCK ACTUATOR ASSEMBLY

(a) Reconnect the D17 connector to the steering lock actuator assembly (steering lock ECU).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D17-4 (SLP1) - Body ground	Steering lock	10 kΩ or higher
D17-4 (SLP1) - Body ground	Steering unlock	Below 1 Ω

Text in Illustration

*1	Component with harness connected (Steering Lock Actuator (Steering Lock ECU Assembly))

OK

REPLACE POWER MANAGEMENT CONTROL ECU

NG

REPLACE STEERING LOCK ACTUATOR ASSEMBLY

20.	REPAIR OR REPLACE HARNESS OR CONNECTOR OR ST RELAY OR PARK/NEUTRAL POSITION SWITCH

(a) Replace with a new or normally functioning part. Repair or replace any damaged wire harness or connector.

NEXT

21.	READ VALUE USING TECHSTREAM (STARTER REQUEST SIGNAL)

(a) Enter the following menus: Body Electrical / Power Source Control / Data List.

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

Power Source Control

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Starter Request Signal	Starter request signal monitor/ON or OFF	ON: ST relay is on OFF: ST relay is off	-

NOTICE:

Check that the engine switch indicator is illuminated in green and push the engine switch.

OK:

ON (ST relay on) and OFF (ST relay off) appear on the screen.

NG

REPLACE POWER MANAGEMENT CONTROL ECU

OK

22.	CHECK IF ENGINE STARTS

(a) Place the electrical key on the driver seat.

(b) Move the shift lever to P.

(c) Depress the brake pedal.

(d) Check that the engine switch indicator light is green. Then press the engine switch to check if the engine starts.

OK:

Engine can be started.

OK

END

NG

CHECK HARNESS AND CONNECTOR (MALFUNCTION IN RELAY CONTACT SIDE CIRCUIT)