Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota 4Runner 1996-2003 Approved SIL techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 024runne di eg5vzfe fuelpump
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DI-151
DIAGNOSTICS - ENGINE (5VZ-FE)
DI8XN-02
Fuel Pump Control Circuit
CIRCUIT DESCRIPTION
In the diagram below, when the engine is cranked, current flows from terminal ST of the ignition switch to
the starter relay coil, the starter relay switches on and current flows to coil L1 of the circuit opening relay.
Thus the circuit opening relay switches on, power is supplied to the fuel pump and the fuel pump oparates.
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil L2 of the circuit
opening relay, the relay switches on, and the fuel pump operates. While the NE signal is generated (engine
running), the ECM keeps Tr ON (circuit opening relay ON) and the fuel pump also keeps operating.
IG Switch ECM
MREL
EFI Relay
Circuit
Opening
Relay
AM1
STA Gauge
AM2
Fuel Pump
ALT
FC
Park/Neutral
Position
Switch
Starter Relay
(STA Signal) STA
Generator NE Signal NE
From
Battery Crankshaft
Position
Sensor
Stater
A18088
2002 4RUNNER (RM887U)
Author : Date : 327
DI-152
DIAGNOSTICS - ENGINE (5VZ-FE)
WIRING DIAGRAM
ECM
14 4
GR-B GR-B
IG1 E14 MREL
7 L-R 16
L-R
I14 IG1 E14 BATT
Engine Room R/B Driver Side J/B
Ignition SW C6 Circuit
EFI AM1 4 IGN 10 Opening Relay 22
L-R W-R B-R B-L G-Y
2 2 1I 1F E14 FC
AM2 IG2 6 1 2
2 11 2
EFI Relay J/C
1 D E
W-L W-L W-L L-O
2 2 IG1 J7 J8
5 3 5 3
J/C 1 IE1
W-B A A
W-B
2 2 J2 J1
1 2
Center J/B 3
I14 Ignition Switch Driver Side J/B 1 B
3E E12 NSW
W 3 STA 6 2 B B
G-B B 3
1I 1E 3E 3E II1 9
7 AM2 ST2
8
P1
J/C Park/Neutral
2 GAAUGE 5 B C
B-Y R-L Position SW
1I 1E J2 J1 L-O
2 AM1 IG1 4 R-L 6
6 B-W
B-W B-W
IG1
Engine Room R/B
Starter Relay 7
W-B B-W
2 2 E14 STA
1 2 3
B-W
2 2 EA1 1 EA1
5 3
W
R-L
AM1 ALT 2
W
2 2 G1
2 B-W 4
1 2 1 IG F10
AM2
Fuel
2 Pump
2 1 5
W Generator
1
1 S1
B-L W-B
S2
Starter
EB BH
EB
Battery
A18104
2002 4RUNNER (RM887U)
Author : Date : 328
DI-153
DIAGNOSTICS - ENGINE (5VZ-FE)
INSPECTION PROCEDURE
TOYOTA hand-held tester:
1 Connect TOYOTA hand-held tester, and check operation of fuel pump (See page
SF-7 ).
OK Check for starter signal circuit (See page
DI-145 ).
NG
2 Check for ECM power source circuit (See page DI-148 ).
NG Repair or replace.
OK
3 Check circuit opening relay (See page SF-37 ).
NG Replace circuit opening relay.
OK
2002 4RUNNER (RM887U)
Author : Date : 329
DI-154
DIAGNOSTICS - ENGINE (5VZ-FE)
4 Check voltage between terminals FC of ECM and body ground.
ON PREPARATION:
(a) Remove the glove compartment (See page SF-54 ).
FC (b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal FC of the ECM and body
ground.
(-) (+) OK:
Voltage: 9 - 14 V
A15326
OK Go to step 5.
NG
Check for open in harness and connector between EFI main relay (Marking: EFI) and circuit open-
ing relay, and circuit opening relay and ECM.
5 Check fuel pump (See page SF-7 ).
NG Repair or replace fuel pump.
OK
6 Check for open in harness and connector between circuit opening relay and fuel
pump, and fuel pump and body ground (See page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-28 ).
2002 4RUNNER (RM887U)
Author : Date : 330
DI-155
DIAGNOSTICS - ENGINE (5VZ-FE)
OBD II scan tool (excluding TOYOTA hand-held tester):
1 Check operation of fuel pump (See page SF-7 ).
OK Check for starter signal circuit (See page
DI-145 ).
NG
2 Check for ECM power source circuit (See page DI-148 ).
NG Repair or replace.
OK
3 Check circuit opening relay (See page SF-37 ).
NG Replace circuit opening relay.
OK
4 Check voltage between terminals FC of ECM connector and body ground (See
page DI-151 , step 4).
OK Go to step 5.
NG
Check for open in harness and connector between EFI main relay (Marking: EFI) and circuit open-
ing relay, and circuit opening relay and ECM.
2002 4RUNNER (RM887U)
Author : Date : 331
DI-156
DIAGNOSTICS - ENGINE (5VZ-FE)
5 Check fuel pump (See page SF-7 ).
NG Repair or replace fuel pump.
OK
6 Check for open in harness and connector between circuit opening relay and fuel
pump, and fuel pump and body ground (See page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-28 ).
2002 4RUNNER (RM887U)
Author : Date : 332
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