Page 745 of 3000
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–459
ES
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
A165826E01
Page 746 of 3000
ES–4602GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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WIRING DIAGRAM
INSPECTION PROCEDURE
(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.
1CHECK FUEL PUMP
A162641E03
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2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–461
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OK
NG
(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.
(c) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / ACTIVE TEST / FUEL PUMP / SPD.
(d) Check the relay operation while operating it using the
intelligent tester.
Standard:
Operating noise can be heard from the relay.
OK
NG
(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
(c) Reinstall the C/OPN relay.
NG
OK
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage according to the value(s) in the
table below.
Standard voltage
OK Go to step 14
2PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE C/OPN RELAY)
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
(See page ES-27)
3INSPECT RELAY (C/OPN RELAY)
B016200
Tester Connection Specified Condition
3 - 5 10 k
or higher
3 - 5Below 1
(Apply battery voltage between terminals 1 and 2)
REPLACE RELAY (C/OPN RELAY)
4INSPECT ECM (FC VOLTAGE)
A162489E12
Tester Connection Specified Condition
E4-10 (FC) - E11-1 (E1) 9 to 14 V
Go to step 8
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ES–4622GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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NG
(a) Disconnect the E4 ECM connector.
(b) Remove the C/OPN relay from the engine room junction
block.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance:
Check for open
Check for short
(d) Reconnect the ECM connector.
(e) Reinstall the C/OPN relay.
NG
OK
(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
(c) Reinstall the IGN fuse.
NG
OK
5CHECK HARNESS AND CONNECTOR (ECM - C/OPN RELAY)
A163319E02
Tester Connection Specified Condition
FC (E4-10) - C/OPN terminal (1) Below 1
Tester Connection Specified Condition
FC (E4-10) or C/OPN terminal (1) - Body ground 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR (ECM - C/OPN RELAY)
6CHECK FUSE (IGN FUSE)
A080034E04
REPLACE FUSE (IGN FUSE)
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2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–463
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(a) Reconnect the I15 ignition switch connector.
(b) Remove the C/OPN relay from the engine room junction
block.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance:
Check for open
Standard resistance:
Check for short
(d) Reconnect the ignition switch connector.
(e) Reinstall the C/OPN relay.
NG
OK
NG
OK
(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
(c) Reinstall the fuel pump relay.
7CHECK HARNESS AND CONNECTOR (C/OPN RELAY - IGNITION SWITCH)
A122510E03
Tester Connection Specified Condition
IG2 (I15-6) - C/OPN terminal (2) Below 1
Tester Connection Specified Condition
IG2 (I15-6) or C/OPN terminal (2) - Body ground 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR (C/OPN RELAY - IGNITION
SWITCH)
8CHECK ECM POWER SOURCE CIRCUIT
REPAIR OR REPLACE ECM POWER
SOURCE CIRCUIT
9INSPECT RELAY (FUEL PUMP RELAY)
A137690
Tester connection Specified Condition
3 - 4 Below 1
3 - 5 10 k or higher
3 - 410 k
or higher
(When battery voltage is applied to terminals 1 and
2)
3 - 5Below 1
(When battery voltage is applied to terminals 1 and
2)
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ES–4642GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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NG
OK
(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.
NG
OKREPLACE RELAY (FUEL PUMP RELAY)
10INSPECT FUEL PUMP
A074356E31
Tester Connection Condition Specified Condition
4 - 5 20
C (68F) 0.2 to 0.3
REPLACE FUEL PUMP ASSEMBLY (See
page FU-30)
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2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–465
ES
(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
NG
OK
(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.
(c) Reconnect the fuel pump connector.
11CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP RELAY)
A163162E02
Tester Connection Specified Condition
FUEL PUMP relay terminal 4 - F20-4 Below 1
FUEL PUMP relay terminal 4 or F20-4 - Body ground 10 k or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR (FUEL PUMP - FUEL PUMP
RELAY)
12CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)
A163543E01
Tester Connection Specified Condition
F20-5 (Fuel pump) - Body ground Below 1
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ES–4662GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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NG
OK
(a) Remove the C/OPN relay from the engine room junction
block.
(b) Remove the FUEL PUMP relay from the engine room
junction block.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance:
Check for open
Check for short
(d) Reinstall the C/OPN relay.
(e) Reinstall the FUEL PUMP relay.
NG
OK
(a) Disconnect the F24 fuel pump resistor connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(c) Reconnect the fuel pump resistor connector.
NG
OKREPAIR OR REPLACE HARNESS OR
CONNECTOR (FUEL PUMP - BODY
GROUND)
13CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP RELAY)
A163320E02
Tester Connection Specified Condition
C/OPN relay terminal (3) - FUEL PUMP relay terminal
(3)Below 1
C/OPN relay terminal (3) - FUEL PUMP relay terminal
(2)Below 1
Tester Connection Specified Condition
C/OPN relay terminal (3) or FUEL PUMP relay
terminal (3) - Body ground10 k
or higher
C/OPN relay terminal (3) or FUEL PUMP relay
terminal (2) - Body ground10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR (C/OPN RELAY - FUEL PUMP
RELAY)
14INSPECT FUEL PUMP RESISTOR
A072544E01
Tester Connection Condition Specified Condition
1 - 2 20
C (68F) 0.30 to 0.34
REPLACE FUEL PUMP RESISTOR