Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cifuelpu
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DI-147
DIAGNOSTICS - ENGINE
DI8B5-01
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 and also current flows to terminal STA of ECM (STA signal).
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil of the circuit
opening relay, the relay switches on, power is supplied to the fuel pump 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.
EFI Main Relay Circuit Opening Relay ECM
EFI
IGN
Fuel Pump
FC
IG Switch Tr
Park/ Neutral Position Switch (A/T)
AM2 Clutch Start Switch (M/T)
(STA Signal) STA
MAIN (NE Signal) NE
Battery
Starter Relay
Starter
P19781
2001 SIENNA (RM787U)
Author : Date : 301
WIRING DIAGRAM
DI-148
2001 SIENNA (RM787U)
ECM
B+
Engine Room Y-G 8
MREL
E8
J/B No.2
7 2K Engine Room R/B No.1
EFI Relay
EFI 10
B-R CIR OPN Relay
2C
5 3 W Engine Room J/B No.2
5 1 1
W-B 5 3
2C 9 5 LG-R 3 FC
AM2 1 2 G-R
1 1 2C 2K E8
ST Relay
2 1
3 MAIN 5
W B-R B-O
2B 2D 1 EB1
1 2 5 3 E01
DIAGNOSTICS
9
W-B
2K
4 2L 11 2J 1 2
W
GR F J7 7 IC1
B-L J/C
-
W J6 J/C F
B-W B-W 6 IK3
ENGINE
W 8 IG1
C C GR
B-R
W-B
Driver Side J/B No.1
B-O 1 BA1
Author :
5 1B 3 1J
FL MAIN
W
11 IH1
Driver Side J/B No.1
4
STARTER
Driver Side J/B No.1
7 1W
B-W 7 1G
IH1 3 Fuel
5 1 Pump
IGN
Park
5 1K 4 1K GR S1 5
Nutral W-B
R
Position
8 6 7 BA1 4 1Y
Switch 1K
ST2 6 3
Starter
Date :
IG2
W-B
Battery AM2 W-B
W-R 7
B-R
EE BK IG
A09079
302
DI-149
DIAGNOSTICS - ENGINE
INSPECTION PROCEDURE
1 Check operation of fuel pump (See page SF-6 ).
OK Check for starter signal circuit
( See page DI-141 ).
NG
2 Check for ECM power source circuit (See page DI-144 ).
NG Repair or replace.
OK
3 Check circuit opening relay (See page SF-66 ).
NG Replace circuit opening relay.
OK
4 Check voltage between terminal FC of ECM and body ground
ON PREPARATION:
(a) Remove the glove compartment (See page SF-83 ).
FC (+)
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal FC of ECM and body
ground.
OK:
Voltage 9 - 14 V
A02064
NG Check for open in harness and connector be-
tween EFI main relay (Marking: EFI) and circuit
opening relay, circuit opening relay and ECM.
OK
2001 SIENNA (RM787U)
Author : Date : 303
DI-150
DIAGNOSTICS - ENGINE
5 Check fuel pump (See page SF-6 ).
NG Repair or replace fuel pump.
OK
6 Check for open in harness and connector between circuit opening relay and fuel
pump, fuel pump and body ground (See page IN-31 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-31 ).
2001 SIENNA (RM787U)
Author : Date : 304
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