Toyota Rav4 2000 Throttle Body Circuit Diagram

From EFI MAIN Fuse From EFI MAIN Relay

Throttle Position Sensor, Accelerator Pedal Position Sensor, etc. (Sensors which have IC)

Engine Coolant Temperature Sensor, Intake Air Temperature Sensor, etc.

From EFI MAIN Fuse From EFI MAIN Relay

Throttle Position Sensor, Accelerator Pedal Position Sensor, etc. (Sensors which have IC)

Engine Coolant Temperature Sensor, Intake Air Temperature Sensor, etc.

A116143E06

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 ON. The MIL goes off when the engine is started.

WIRING DIAGRAM

Throttle Position Sensor

Accelerator Pedal Position Sensor

Canister Pressure Sensor

VCPA6

VCP2 VPA 9 VPA2 ? EPA EPA2

VC5 (

Battery Current

IB (

Sensor

THBc

E2

INSPECTION PROCEDURE

VCTA

o VTA1

VCPA

VCP2

y VPA

EPA2

VCPP

VCIB

A129764E01

CHECK MIL

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

SYSTEM OK

CHECK COMMUNICATION BETWEEN INTELLIGENT TESTER AND ECM

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch ON and tester ON.

(c) Check the communication between the tester and ECM.

Result

Result

Proceed To

Communication is possible

A

Communication is not possible

GO TO MIL CIRCUIT

CHECK MIL (THROTTLE POSITION SENSOR)

(a) Disconnect the B3 throttle body connector.

(b) Turn the ignition switch ON.

Result

Result

Proceed To

MIL illuminates

A

MIL does not illuminate

B

(d) Reconnect the throttle body connector.

REPLACE THROTTLE BODY ASSEMBLY

CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

(a) Disconnect the A4 accelerator pedal position sensor connector.

(b) Turn the ignition switch ON.

Result

Result

Proceed To

MIL illuminates

A

MIL does not illuminate

B

(d) Reconnect the accelerator pedal position sensor connector.

REPLACE ACCELERATOR PEDAL POSITION SENSOR

CHECK MIL (CANISTER PUMP MODULE)

Result

(a) Disconnect the S3 canister pump module connector.

(b) Turn the ignition switch ON.

Result

Result

Proceed To

MIL illuminates

A

MIL does not illuminate

B

(d) Reconnect the canister pump module connector.

REPLACE CHARCOAL CANISTER ASSEMBLY

CHECK MIL (BATTERY CURRENT SENSOR)

(a) Disconnect the B29 battery current sensor connector.

(b) Turn the ignition switch ON.

Result

Result

Proceed To

MIL illuminates

A

MIL does not illuminate

B

(d) Reconnect the battery current sensor connector.

REPLACE BATTERY CURRENT SENSOR

CHECK HARNESS AND CONNECTOR

(a) Disconnect the B3 throttle body connector.

(b) Disconnect the A4 accelerator pedal position sensor connector.

(c) Disconnect the S3 canister pump module connector.

(d) Disconnect the B29 battery current sensor connector.

Wire Harness Side :

B30) ECM Connector

/y—

1 II

V-

l'

\

s

A

s

V

VCTA VCIB VCPP Front View (^A^ ECM Connector

Front View

1_r

h-B-

r

1—L

-FT"1

VCPA

VCPA

VCP2

A107934E13

(e) Disconnect the A9 and B30 ECM connectors.

(f) Measure the resistance.

Standard resistance (check for short)

Tester Connections

Specified Conditions

B30-67 (VCTA) - Body ground

10 kQ or higher

A9-57 (VCPA) - Body ground

10 kQ or higher

A9-58 (VCP2) - Body ground

10 kQ or higher

B30-70 (VCPP) - Body ground

10 kQ or higher

B30-69 (VCIB) - Body ground

10 kQ or higher

(g) Reconnect the throttle body connector.

(h) Reconnect the accelerator pedal position sensor connector.

(i) Reconnect the canister pump module connector. (j) Reconnect the battery current sensor connector. (k) Reconnect the ECM connectors.

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM

Fuel Pump Control Circuit

DESCRIPTION

When the engine is cranked, the starter relay drive signal output from the STAR terminal of the ECM is input into the STA terminal of the ECM, and NE signal generated by the crankshaft position sensor is also input into the NE+ terminal. Thus, the ECM interprets that the engine is cranked, and turns the transistor Tr1 in the ECM internal circuit ON. The current flows to the C/OPN (Circuit Opening) relay by turning the Tr1 ON. Then, the fuel pump operates.

While the NE signal is input into the ECM, when the engine is running, the ECM turns the Tr1 on continuously.

C/OPN

ST2 AM2

ST2 AM2

Ignition Switch

EFI MAIN

EFI MAIN

-CTNyO-

Fuel Pump

Park / Neutral Start Switch

MAIN

To Starter

NE Signal

Battery

A134233E01

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook


Post a comment