Last Modified: 08-28-2024 6.11:8.1.0 Doc ID: RM100000000VIBM
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: 2GR-FE (ENGINE CONTROL): SFI SYSTEM: VC Output Circuit; 2016 MY Sienna [12/2015 - 08/2016]

VC Output Circuit

DESCRIPTION

The ECM constantly uses 5 V from the battery voltages supplied to the +B (BATT) terminal to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit.

When the VC circuit is shorted, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are inactivated because the power is not supplied from the VC circuit. Under this condition, the system does not start up and the MIL does not illuminate even if the system malfunctions.

HINT:

Under normal conditions, the MIL is illuminated for several seconds when the ignition switch is first turned ON. The MIL goes off when the engine is started.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

  • Bank 1 refers to the bank that includes the No. 1 cylinder*.

    *: The No. 1 cylinder is the cylinder which is farthest from the transaxle.

  • Bank 2 refers to the bank that does not include the No. 1 cylinder.

PROCEDURE

1.

CHECK MIL

(a) Check that the Malfunction Indicator Lamp (MIL) illuminates when turning the ignition switch to ON.

OK:

MIL lights up.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

CHECK CONNECTION BETWEEN TECHSTREAM AND ECM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Check the communication between the Techstream and ECM.

Result

Result

Proceed to

Communication is not possible

A

Communication is possible

B
B

GO TO MIL CIRCUIT

A

3.

CHECK MIL (THROTTLE POSITION SENSOR)

(a) Disconnect the B20 throttle body with motor assembly connector.

(b) Turn the ignition switch to ON.

(c) Check the MIL.

Result

Result

Proceed to

MIL does not illuminate

A

MIL illuminates

B

HINT:

Perform "Inspection After Repair" after repairing the throttle body with motor assembly (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION ).

B

REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

A

4.

CHECK MIL (ACCELERATOR PEDAL SENSOR ASSEMBLY)

(a) Disconnect the A57 accelerator pedal sensor assembly connector.

(b) Turn the ignition switch to ON.

(c) Check the MIL.

Result

Result

Proceed to

MIL does not illuminate

A

MIL illuminates

B
B

REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

A

5.

CHECK MIL (VVT SENSOR (FOR INTAKE SIDE OF BANK 1))

(a) Disconnect the B16 VVT sensor (for intake side of bank 1) connector.

(b) Turn the ignition switch to ON.

(c) Check the MIL.

Result

Result

Proceed to

MIL illuminates

A

MIL does not illuminate

B
B

REPLACE VVT SENSOR (FOR INTAKE SIDE OF BANK 1)

A

6.

CHECK MIL (VVT SENSOR (FOR INTAKE SIDE OF BANK 2))

(a) Disconnect the B17 VVT sensor (for intake side of bank 2) connector.

(b) Turn the ignition switch to ON.

(c) Check the MIL.

Result

Result

Proceed to

MIL illuminates

A

MIL does not illuminate

B
B

REPLACE VVT SENSOR (FOR INTAKE SIDE OF BANK 2)

A

7.

CHECK MIL (VVT SENSOR (FOR EXHAUST OF SIDE BANK 1))

(a) Disconnect the B36 VVT sensor (for exhaust side of bank 1) connector.

(b) Turn the ignition switch to ON.

(c) Check the MIL.

Result

Result

Proceed to

MIL illuminates

A

MIL does not illuminate

B
B

REPLACE VVT SENSOR (FOR EXHAUST SIDE OF BANK 1)

A

8.

CHECK MIL (VVT SENSOR (FOR EXHAUST SIDE OF BANK 2))

(a) Disconnect the B37 VVT sensor (for exhaust side of bank 2) connector.

(b) Turn the ignition switch to ON.

(c) Check the MIL.

Result

Result

Proceed to

MIL illuminates

A

MIL does not illuminate

B
B

REPLACE VVT SENSOR (FOR EXHAUST SIDE OF BANK 2)

A

9.

CHECK MIL (CANISTER PUMP MODULE)

(a) Disconnect the g1 canister pump module connector.

(b) Turn the ignition switch to ON.

(c) Check the MIL.

Result

Result

Proceed to

MIL illuminates

A

MIL does not illuminate

B
B

REPLACE CHARCOAL CANISTER MODULE

A

10.

CHECK HARNESS AND CONNECTOR (THROTTLE BODY WITH MOTOR ASSEMBLY - ECM)

(a) Disconnect the B20 throttle body with motor assembly connector.

(b) Disconnect the B1 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B1-80 (VCTA) or B20-5 (VC) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL SENSOR ASSEMBLY - ECM)

(a) Disconnect the A57 accelerator pedal sensor assembly connector.

(b) Disconnect the B1 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A57-1 (VCP2) or A39-59 (VCP2) - Body ground

Always

10 kΩ or higher

A57-4 (VCPA) or A39-57 (VCPA) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

12.

CHECK HARNESS AND CONNECTOR (VVT SENSOR (FOR INTAKE SIDE OF BANK 2) - ECM)

(a) Disconnect the B16 VVT sensor (for intake side of bank 2) connector.

(b) Disconnect the B1 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B17-3 (VC) or B1-66 (VCV2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

13.

CHECK HARNESS AND CONNECTOR (VCV1 CIRCUIT)

(a) Disconnect the B17 VVT sensor (for intake side of bank 1) connector.

(b) Disconnect the B36 VVT sensor (for exhaust side of bank 1) connector.

(c) Disconnect the B37 VVT sensor (for exhaust side of bank 2) connector.

(d) Disconnect the g1 canister pump module connector.

(e) Disconnect the B1 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B1-67 (VCV1) - Body ground

Always

10 kΩ or higher
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR