Toyota Sienna Service Manual: Fuel Pump Control Circuit

Toyota Sienna Service Manual / Engine / 2Gr-fe engine control system / Sfi system / Diagnostic trouble code chart / 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-rotating signal (NE).

The FUEL PUMP relay is turned ON while the engine is idling or operating at low load. This causes current to flow through the fuel pump resistor to the fuel pump. The fuel pump then operates at low speed.

The FUEL PUMP relay is turned OFF while the engine is cranking or operating at high load. The fuel pump then operates at normal speed.

Fuel Pump Control Circuit

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK FUEL PUMP

(a) Check if there is pressure in the fuel inlet hose.

HINT:

If there is fuel pressure, the sound of fuel flowing will be heard.

2 PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE C/OPN RELAY)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch to the ON position and turn the intelligent tester or the OBD II scan tool main switch on.

(d) Check the relay operation while operating it using the intelligent tester.

Standard: Operating noise can be heard from the relay.

3 INSPECT RELAY (C/OPN RELAY)

INSPECT RELAY (C/OPN RELAY)

(a) Remove the C/OPN relay from the engine room junction block.

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

Standard resistance

4 INSPECT ECM (FC VOLTAGE)

INSPECT ECM (FC VOLTAGE)

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

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

Standard voltage

5 CHECK HARNESS AND CONNECTOR (ECM - C/OPN RELAY)

CHECK HARNESS AND CONNECTOR (ECM - C/OPN RELAY)

(a) Disconnect the E4 ECM connector.

(b) Remove the C/OPN relay from the engine room junction block.

Standard resistance:

(d) Reconnect the ECM connector.

(e) Reinstall the C/OPN relay.

6 CHECK FUSE (IGN FUSE)

CHECK FUSE (IGN FUSE)

(a) Remove the IGN fuse from the driver side junction block.

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

Standard resistance: Below 1 Ω

7 CHECK HARNESS AND CONNECTOR (C/OPN RELAY - IGNITION SWITCH)

CHECK HARNESS AND CONNECTOR (C/OPN RELAY - IGNITION SWITCH)

a) Reconnect the I15 ignition switch connector.

(b) Remove the C/OPN relay from the engine room junction block.

Standard resistance:

(d) Reconnect the ignition switch connector.

(e) Reinstall the C/OPN relay.

8 CHECK ECM POWER SOURCE CIRCUIT

9 INSPECT RELAY (FUEL PUMP RELAY)

NSPECT RELAY (FUEL PUMP RELAY)

(a) Remove the fuel pump relay from the engine room junction block.

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

Standard resistance

10 INSPECT FUEL PUMP

NSPECT FUEL PUMP

(a) Measure the resistance of the fuel pump.

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

Standard resistance

(b) Check operation of the fuel pump.

(1) Apply battery voltage to both terminals. Check that the pump operates.

NOTICE:

These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.
Keep the fuel pump as far away from the battery as possible.
Always turn ON and OFF the voltage on the battery side, not on the fuel pump side.

11 CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP RELAY)

CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP RELAY)

(a) Check the wire harness between the FUEL PUMP relay and fuel pump.

(1) Remove the FUEL PUMP relay from the engine room junction block.

(2) Disconnect the F20 fuel pump connector.

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

Standard resistance

12 CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)

CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)

(a) Check the wire harness between the fuel pump and body ground.

(1) Disconnect the F20 fuel pump connector.

(2) Measure the resistance between the terminal of the wire harness side connector and body ground.

Standard resistance

(b) Reinstall the FUEL PUMP relay.

13 CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP RELAY)

CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP RELAY)

(a) Remove the C/OPN relay from the engine room junction block.

(b) Remove the FUEL PUMP relay from the engine room junction block.

Standard resistance:

(d) Reinstall the C/OPN relay.

(e) Reinstall the FUEL PUMP relay.

14 INSPECT FUEL PUMP RESISTOR

INSPECT FUEL PUMP RESISTOR

(a) Disconnect the F24 fuel pump resistor connector.

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

Standard resistance

15 CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - FUEL PUMP RESISTOR)

CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - FUEL PUMP RESISTOR)

(a) Disconnect the F24 fuel pump resistor connector.

(b) Remove the FUEL PUMP relay from the engine room junction block.

Standard resistance:

(d) Reconnect the fuel pump resistor connector.

(e) Reinstall the FUEL PUMP relay.

16 CHECK HARNESS AND CONNECTOR (FUEL PUMP RESISTOR - FUEL PUMP)

CHECK HARNESS AND CONNECTOR (FUEL PUMP RESISTOR - FUEL PUMP)

(a) Disconnect the F24 fuel pump resistor connector.

(b) Disconnect the F20 fuel pump connector.

Standard resistance:

(d) Reconnect the fuel pump resistor connector.

(e) Reconnect the fuel pump connector.

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See page ES-27)

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 ...

Cranking Holding Function Circuit

DESCRIPTION The system detects the ignition switch's starting signal (STSW) and then supplies current to the starter until the ECM judges that the engine has started successfully. The purpose is t ...

Other materials:

System description
1. DESCRIPTION OF SYSTEM (a) A tire pressure warning valve and transmitter is equipped with a tire pressure sensor and a transmitter and is installed in a tire wheel assembly. The sensor measures the tire pressure. The measured value and transmitter ID are transmitted to the tire pressure wa ...

Drive belt
COMPONENTS REMOVAL 1. REMOVE FRONT WHEEL RH 2. REMOVE FRONT FENDER APRON SEAL RH (See page EM-26) 3. REMOVE V-RIBBED BELT (a) Using SST, release the belt tension by turning the belt tensioner counterclockwise, and remove the Vribbed belt from the belt tensioner. SST 09249-63010 (b) ...

TS and CG Terminal Circuit
DESCRIPTION In the sensor check mode, a malfunction of the speed sensor that cannot be detected when the vehicle is stopped is detected while driving. Transition to the sensor check mode can be performed by connecting terminals TS and CG of the DLC3 and turning the ignition switch from off ...