VC Output Circuit 1GR-FE

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK MIL

CHECK COMMUNICATION BETWEEN INTELLIGENT TESTER AND ECM

CHECK MIL (THROTTLE BODY)

CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

CHECK MIL (VVT SENSOR FOR BANK 1)

CHECK MIL (VVT SENSOR FOR BANK 2)

CHECK HARNESS AND CONNECTOR

SFI system - VC Output Circuit

Description

The ECM constantly generates 5 V of power 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 short-circuited, the microprocessor in the ECM and sensors that are supplied with 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 to ON. The MIL goes off when the engine is started.

Wiring diagram

Inspection procedure

HINT:

When viewed from the rear of the engine assembly, Bank 1 is on the right side and Bank 2 is on the left side.

1.CHECK MIL

1. Check that the Malfunction Indicator Lamp (MIL) lights up when turning the ignition switch to ON.

   Result

   Result	Proceed to
   MIL illuminates	A
   MIL does not illuminate	B

A	SYSTEM OK

B

2.CHECK COMMUNICATION BETWEEN INTELLIGENT TESTER AND ECM

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch to ON and tester on.

3. Check the communication between the tester and ECM.

   Result

   Result	Proceed to
   Communication is possible	A
   Communication is not possible	B

A	GO TO MIL CIRCUIT

B

3.CHECK MIL (THROTTLE BODY)

1. Disconnect the throttle body connector.

2. Turn the ignition switch to ON.

3. Check the MIL.

   Result

   Result	Proceed to
   MIL illuminates	A
   MIL does not illuminate	B

4. Reconnect the throttle body connector.

A	REPLACE THROTTLE BODY ASSEMBLY

B

4.CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

1. Disconnect the accelerator pedal position sensor connector.

2. Turn the ignition switch to ON.

3. Check the MIL.

   Result

   Result	Proceed to
   MIL illuminates	A
   MIL does not illuminate	B

4. Reconnect the accelerator pedal position sensor connector.

A	REPLACE ACCELERATOR PEDAL ASSEMBLY

B

5.CHECK MIL (VVT SENSOR FOR BANK 1)

1. Disconnect the air cleaner assembly with element.

2. Disconnect the VVT sensor (bank 1) connector.

3. Turn the ignition switch to ON.

4. Check the MIL.

   Result

   Result	Proceed to
   MIL illuminates	A
   MIL does not illuminate	B

5. Reconnect the VVT sensor (bank 1) connector.

A	REPLACE VVT SENSOR (BANK 1)

B

6.CHECK MIL (VVT SENSOR FOR BANK 2)

1. Disconnect the VVT sensor (bank 2) connector.

2. Turn the ignition switch to ON.

3. Check the MIL.

   Result

   Result	Proceed to
   MIL illuminates	A
   MIL does not illuminate	B

4. Reconnect the VVT sensor (bank 2) connector.

A	REPLACE VVT SENSOR (BANK 2)

B

7.CHECK HARNESS AND CONNECTOR

1. Disconnect the throttle body connector.

2. Disconnect the accelerator pedal position sensor connector.

3. Disconnect the VVT sensor (bank 1) connector.

4. Disconnect the VVT sensor (bank 2) connector.

5. Disconnect the ECM connectors.

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

   Standard Resistance (Check for Short):

   for LHD

   Tester Connection	Condition	Specified Condition
   A38-57 (VCPA) - Body ground	Always	10 k? or higher
   A38-58 (VCP2) - Body ground	Always	10 k? or higher
   C45-96 (VCTA) - Body ground	Always	10 k? or higher
   C45-115 (VCV1) - Body ground	Always	10 k? or higher
   C45-113 (VCV2) - Body ground	Always	10 k? or higher

   for RHD

   Tester Connection	Condition	Specified Condition
   A52-57 (VCPA) - Body ground	Always	10 k? or higher
   A52-58 (VCP2) - Body ground	Always	10 k? or higher
   C46-96 (VCTA) - Body ground	Always	10 k? or higher
   C46-115 (VCV1) - Body ground	Always	10 k? or higher
   C46-113 (VCV2) - Body ground	Always	10 k? or higher

7. Reconnect the ECM connectors.

8. Reconnect the throttle body connector.

9. Reconnect the accelerator pedal position sensor connector.

10. Reconnect the VVT sensor (bank 1) connector.

11. Reconnect the VVT sensor (bank 2) connector.

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE ECM