Toyota Sienna Service Manual: VC Output Circuit

Toyota Sienna Service Manual / Engine / 2Gr-fe engine control system / Sfi system / Diagnostic trouble code chart / 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 short-circuited, 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 to the ON position. The MIL goes off when the engine is started.

VC Output Circuit

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK MIL

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

OK: MIL lights up.

2 CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch to the ON position and turn the tester on.

Result

3 CHECK THROTTLE BODY (CHECK MIL ILLUMINATED)

(a) Disconnect the throttle body connector.

(b) Turn the ignition switch to the ON position.

Result

(d) Reconnect the throttle body connector.

4 CHECK ACCELERATOR PEDAL ROD (CHECK MIL ILLUMINATED)

(a) Disconnect the accelerator pedal position sensor connector.

(b) Turn the ignition switch to the ON position.

Result

(d) Reconnect the accelerator pedal position sensor connector.

5 CHECK VVT SENSOR FOR INTAKE CAMSHAFT BANK 1 (CHECK MIL ILLUMINATED)

(a) Disconnect the VVT sensor for intake camshaft bank 1 connector.

(b) Turn the ignition switch to the ON position.

Result

(d) Reconnect the VVT sensor for intake camshaft bank 1 connector.

6 CHECK VVT SENSOR FOR EXHAUST CAMSHAFT BANK 1 (CHECK MIL ILLUMINATED)

(a) Disconnect the VVT sensor for exhaust camshaft bank 1 connector.

(b) Turn the ignition switch to the ON position.

Result

(d) Reconnect the VVT sensor for exhaust camshaft bank 1 connector.

7 CHECK VVT SENSOR FOR INTAKE CAMSHAFT BANK 2 (CHECK MIL ILLUMINATED)

(a) Disconnect the VVT sensor for intake camshaft bank 2 connector.

(b) Turn the ignition switch to the ON position.

Result

(d) Reconnect the VVT sensor for intake camshaft bank 2 connector.

8 CHECK VVT SENSOR FOR EXHAUST CAMSHAFT BANK 2 (CHECK MIL ILLUMINATED)

(a) Disconnect the VVT sensor for exhaust camshaft bank 2 connector.

(b) Turn the ignition switch to the ON position.

Result

(d) Reconnect the VVT sensor for exhaust camshaft bank 2 connector.

9 CHECK CHARCOAL CANISTER ASSEMBLY (CHECK MIL ILLUMINATED)

(a) Disconnect the canister pump module connector.

(b) Turn the ignition switch to the ON position.

Result

(d) Reconnect the canister pump module connector.

10 CHECK HARNESS AND CONNECTOR

CHECK HARNESS AND CONNECTOR

(a) Disconnect the throttle body connector.

(b) Disconnect the accelerator pedal position sensor connector.

(d) Disconnect the VVT sensor for exhaust camshaft bank 1 connector.

(e) Disconnect the VVT sensor for intake camshaft bank 2 connector.

(f) Disconnect the VVT sensor for exhaust camshaft bank 2 connector.

(g) Disconnect the canister pump module connector.

(h) Disconnect the E9 and E4 ECM connectors.

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

Standard resistance (Check for short)

(j) Reconnect the ECM connectors.

(k) Reconnect the canister pump module connector.

(l) Reconnect the VVT sensor for exhaust camshaft bank 2 connector.

(m) Reconnect the VVT sensor for intake camshaft bank 2 connector.

(n) Reconnect the VVT sensor for exhaust camshaft bank 1 connector.

(o) Reconnect the VVT sensor for intake camshaft bank 1 connector.

(p) Reconnect the accelerator pedal position sensor connector.

(q) Reconnect the throttle body connector.

REPLACE ECM (See page ES-498)

ECM Power Source Circuit

DESCRIPTION When the ignition switch is turned to the ON position, the battery voltage is applied to terminal IGSW of the ECM. The ECM MREL output signal causes a current to flow to the coil, cl ...

Fuel Pump Control Circuit

DESCRIPTION The FUEL PUMP relay switches the fuel pump speed according to the engine conditions. The fuel pump operates when the ECM receives the starter-operating signal (STA) and crankshaft-ro ...

Other materials:

Adjusting the set speed
To change the set speed, operate the lever until the desired set speed is obtained. Increases the speed Decreases the speed Fine adjustment: Momentarily move the lever in the desired direction. Large adjustment: Hold the lever in the desired direction. The set speed will be incre ...

Inspection
1. INSPECT FRONT SEAT INNER BELT ASSEMBLY RH Release the seat belt (Buckle switch is ON). Check the resistance between the terminals. Standard If the result is not as specified, replace the inner belt assembly. Inspect the buckle switch. Fasten ...

Reassembly
1. INSTALL SEAT POSITION AIRBAG SENSOR (for Driver Seat) 2. INSTALL FRONT SEAT CUSHION SHIELD LOWER LH Install the front seat cushion shield lower LH with the screw. 3. INSTALL FRONT SEAT CUSHION SHIELD LOWER RH HINT: Use the same procedures for the RH side and LH side. 4. INSTAL ...