Toyota Sienna Service Manual: 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.
![DESCRIPTION](images/books/424/76/index447.jpg)
WIRING DIAGRAM
![WIRING DIAGRAM](images/books/424/76/index448.jpg)
INSPECTION PROCEDURE
1 CHECK FUEL PUMP
- 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)
- Connect the intelligent tester to the DLC3.
- Turn the ignition switch to the ON position and turn the
intelligent tester or the OBD II scan tool main switch on.
- Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / ACTIVE TEST / FUEL PUMP / SPD.
- 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](images/books/424/76/index382.gif)
- Remove the C/OPN relay from the engine room junction
block.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance
![Standard resistance](images/books/424/76/index449.jpg)
- Reinstall the C/OPN relay.
4 INSPECT ECM (FC VOLTAGE)
![INSPECT ECM](images/books/424/76/index450.jpg)
- Turn the ignition switch to the ON position.
- Measure the voltage according to the value(s) in the
table below.
Standard voltage
![Standard voltage](images/books/424/76/index385.gif)
5 CHECK HARNESS AND CONNECTOR (ECM - C/OPN RELAY)
![CHECK HARNESS AND CONNECTOR](images/books/424/76/index451.jpg)
- Disconnect the E4 ECM connector.
- Remove the C/OPN relay from the engine room junction
block.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance:
Check for open
![Standard resistance](images/books/424/76/index452.jpg)
Check for short
![Standard resistance](images/books/424/76/index453.jpg)
- Reconnect the ECM connector.
- Reinstall the C/OPN relay.
6 CHECK FUSE (IGN FUSE)
![CHECK FUSE](images/books/424/76/index454.jpg)
- Remove the IGN fuse from the driver side junction block.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance:
Below 1 Ω
- Reinstall the IGN fuse.
7 CHECK HARNESS AND CONNECTOR (C/OPN RELAY - IGNITION SWITCH)
![CHECK HARNESS AND CONNECTOR](images/books/424/76/index455.jpg)
- Reconnect the I15 ignition switch connector.
- Remove the C/OPN relay from the engine room junction
block.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance:
Check for open
![Standard resistance](images/books/424/76/index456.jpg)
Standard resistance:
Check for short
![](images/books/424/76/index457.jpg)
- Reconnect the ignition switch connector.
- Reinstall the C/OPN relay.
8 CHECK ECM POWER SOURCE CIRCUIT
9 INSPECT RELAY (FUEL PUMP RELAY)
![INSPECT RELAY](images/books/424/76/index393.gif)
- Remove the fuel pump relay from the engine room
junction block.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance
![Standard resistance](images/books/424/76/index458.jpg)
- Reinstall the fuel pump relay
10 INSPECT FUEL PUMP
![INSPECT FUEL PUMP](images/books/424/76/index459.jpg)
- Measure the resistance of the fuel pump.
- Measure the resistance according to the value(s) in
the table below.
Standard resistance
![Standard resistance](images/books/424/76/index460.jpg)
- Check operation of the fuel pump.
- 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](images/books/424/76/index461.jpg)
- Check the wire harness between the FUEL PUMP relay
and fuel pump.
- Remove the FUEL PUMP relay from the engine
room junction block.
- Disconnect the F20 fuel pump connector.
- Measure the resistance according to the value(s) in
the table below.
Standard resistance
![Standard resistance](images/books/424/76/index462.jpg)
12 CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)
![CHECK HARNESS AND CONNECTOR](images/books/424/76/index463.jpg)
- Check the wire harness between the fuel pump and body
ground.
- Disconnect the F20 fuel pump connector.
- Measure the resistance between the terminal of the
wire harness side connector and body ground.
Standard resistance
![Standard resistance](images/books/424/76/index40.jpg)
- Reinstall the FUEL PUMP relay.
- Reconnect the fuel pump connector.
13 CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP RELAY)
![CHECK HARNESS AND CONNECTOR](images/books/424/76/index41.jpg)
- Remove the C/OPN relay from the engine room junction
block.
- Remove the FUEL PUMP relay from the engine room
junction block.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance:
Check for open
![Standard resistance](images/books/424/76/index42.jpg)
Check for short
![Standard resistance](images/books/424/76/index43.jpg)
- Reinstall the C/OPN relay.
- Reinstall the FUEL PUMP relay
14 INSPECT FUEL PUMP RESISTOR
![INSPECT FUEL PUMP RESISTOR](images/books/424/76/index44.jpg)
- Disconnect the F24 fuel pump resistor connector.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance
![Standard resistance](images/books/424/76/index36.gif)
- Reconnect the fuel pump resistor connector.
15 CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - FUEL PUMP RESISTOR)
![CHECK HARNESS AND CONNECTOR](images/books/424/76/index45.jpg)
- Disconnect the F24 fuel pump resistor connector.
- Remove the FUEL PUMP relay from the engine room
junction block.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance:
Check for open
![Standard resistance](images/books/424/76/index46.jpg)
Check for short
![Standard resistance](images/books/424/76/index47.jpg)
- Reconnect the fuel pump resistor connector.
- Reinstall the FUEL PUMP relay.
16 CHECK HARNESS AND CONNECTOR (FUEL PUMP RESISTOR - FUEL PUMP)
![CHECK HARNESS AND CONNECTOR](images/books/424/76/index464.jpg)
- Disconnect the F24 fuel pump resistor connector.
- Disconnect the F20 fuel pump connector.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance:
Check for open
![Standard resistance](images/books/424/76/index465.jpg)
Check for short
![Standard resistance](images/books/424/76/index466.jpg)
- Reconnect the fuel pump resistor connector.
- Reconnect the fuel pump connector.
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
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
...
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:
CD cannot be Ejected
INSPECTION PROCEDURE
1 PRESS "EJECT" AND CHECK OPERATION
Press the CD EJECT switch of the radio receiver for 2
seconds or more and check that the CD is ejected.
OK:
CD is ejected
2 REPLACE CD WITH ANOTHER AND RECHECK
Insert another CD and check if it is ejected.
OK:
CD ...
Slide door lock
INSPECTION
1. INSPECT SLIDE DOOR LOCK REMOTE CONTROL SUB-ASSEMBLY LH
Inspect the resistance of the switch.
Resistance
If the result is not as specified, replace the control
assembly.
2. INSPECT SLIDE DOOR LOCK REMOTE CONTROL SUB-ASSEMBLY RH
Inspect the resistance of the swit ...
Reassembly
1. INSTALL REAR DOOR WIRE SUB-ASSEMBLY LH
Install the wire.
NOTICE:
When installing the wire, push the areas where
the clips are installed in order to prevent
damage and deformation.
Install the 2 screws
2. INSTALL REAR DOOR LOCK ASSEMBLY LH
Apply MP grease to the slidin ...