2001 TOYOTA SEQUOIA relay

A23494
Pump Module (fig. 1):
Condition: Purge FlowCondition: Leak Check
From Refueling Valve
To Air Filter
(Atmosphere)
Vacuum Pump: OFFVent Valve: OFF
(vent)
Pressure Sensor 0.02 Inch Orifice
Canister
: Airflow
Vacuum Pump: ON
Vent Valve: ON
(closed)
A23495
Pressure Sensor Specification (fig. 2)
Output Voltage
Usable Range
4.900 V
4.150 V
1.425 V
0.450 V
Malfunction Area
Pressure
60
kPa11 0
kPa
Malfunction Area
Standard atmospheric pressure is 101.3 kPaHINT:
A23496
Soak Timer Circuit (fig. 3)
Ignition Switch
IGSW
Power
ECM
EFI MAIN
MREL+B
15 ASource IC
Soak Timer IC Main Relay
Control IC
Battery DI±464
± DIAGNOSTICSENGINE
658 Author: Date:
2005 SEQUOIA (RM1146U)

A23565
L5
Pump Module
Pressure Sensor
Vacuum Pump
Vent Valve
Engine Room R/B
BatteryJ/C
V4
Purge
VSVVC
PPMP
E2
MPMP
VPMP
PRG
MREL
EFI Relay
F10
FL Block
54
BBEFI No.1
2D1
53EFI No.2
2A 2 4
1
8
9 3
2
G±R AA J/C J2
G±RG±R
G±R G±R
IA44J/C J16
BBBJ/C
IG422
G±RW±G
E8 34
B±W
E68
B±WIA4
14
2H6
21 2F1
W±B
J/C J5 AJ48
J49 FLG±R BB12
G±R
G±R
BN15 P±L
BN1BN1 BN1 BN1 BN1
P±L 6
BB18
P±L P±L
J49
J48 B
H
E456
V±G
J48K
J49E
V±G
BB17
V±G V±G4 G±W3
G±W
BB24
G±W
IJ33
G±W
IG46
G±W
E8 2822
E4 E4 R±G
IJ34
R±G
BB22
R±G 2
R±GG±B1
G±B
BB23
G±B
IJ314
G±B
IG47
G±B
E823
BN1 8 W±B
W±B
BI
EDECM
± DIAGNOSTICSENGINE
DI±465
659 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

± DIAGNOSTICSENGINE
DI±493
687 Author: Date:
2005 SEQUOIA (RM1146U)
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to terminal IGSW of the ECM and
the EFI relay control circuit in the ECM sends a signal to terminal MREL of the ECM switching on the EFI
relay.
This signal causes current to flow to the coil, closing the contacts of the EFI relay and supplying power to
terminal +B of the ECM.
DID8K±01

A23555
F10
Fusible
Link
Block9
+B
BatteryE1 1
8
1 E4
E6
BR 4D
B±R
67 I18 Ignition SW 2
W±R 1C 1E
1C2
13
BIG2
IA4
B±WECM
Engine Room J/B
EFI Relay
1DIGSW
MREL E4E4 17 IGN1
4E
Instrument Panel J/BSub J/B No. 4
5
AM2 Instrument Panel J/B
1
16 AM21J
2D
2F2C
2H 5
32
IA4J/C
5 4
B14 12 2
J16
A
EB EDD
J5
J/C W±B2H
2B±R
B±WB±R B±R EFI No. 1W±RB±O
B±O DI±494
± DIAGNOSTICSENGINE
688 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

A19288
EFI Relay
B17417
E4
MREL ECM Connector
DI±498
± DIAGNOSTICSENGINE
692 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check EFI relay.
PREPARATION:
Remove the EFI relay from the engine room J/B.
CHECK:
Inspect the EFI relay.
OK:
Standard:
Terminal No.ConditionSpecified Condition
3 ± 5Always10 KW or higher
3 ± 5Apply B+ between
terminals 1 and 2Below 1 W
NG Replace EFI relay.
OK
9 Check for open and short in harness and connector between terminal MREL of
ECM and body ground.
PREPARATION:
Disconnect the E4 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tor and body ground.
OK:
Standard:
Tester ConnectionSpecified Condition
MREL (E4±8) ± Body groundBelow 1 W
NG Repair or replace harness or connector.
OK
Check for intermittent problems
(See page DI±11).

A14809
B
BW
WB 2
EB2V2
VSV (ACIS)
2 1L±W21
E4ECM
ACIS
MREL 13
E3 P±B
B±R 1
1
1
1 1 1 1 1
12 EFI No. 2
EFI Main Relay
21
3
5
EFI No. 1
12
Engine Room No. 1 R/B
B±L
Battery B±W
W±B J3
J/C
AA
D
D
W±B
ECW
FL MAIN
1
1
4B
4A
FL BLOCK J7
J/C
W±B
1A DI±500
± DIAGNOSTICSENGINE
694 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

A23670
Wire Harness Side
V12
VSV for ACIS connector
B17413
E5E7
E1
ACIS
DI±502
± DIAGNOSTICSENGINE
696 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and ECM (See page IN±35).
(a) Check the wire harness between the VSV for ACIS and
connector the ECM connector.
(1) Disconnect the VSV for ACIS connector.
(2) Disconnect the E5 and E7 ECM connector.
(3) Check for resistance between the wire harness side
connectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
VSV for ACIS (V12±2) ± ACIS (E5±33)Below 1 W
Standard (Check for short):
Symbols (Terminal No.)Specified condition
VSV for ACIS (V12±2) or ACIS (E5±33) ± E1 (E7±1)10 kW or higher
(b) Check the wire harness between the VSV for ACIS con-
nector and the EFI relay.
(1) Disconnect the VSV for ACIS connector.
(2) Remove the EFI relay from the engine room R/B.
(3) Check for resistance between the wire harness side
connectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
VSV for ACIS (V12±1) ± EFI relay terminal 3 of R/BBelow 1 W
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN±35).

A19655A20059
STSW
ACCR
STAR
(NE)
Engine SpeedStarterPark/Neutral
Position SW
N P ST RelayACC Cut
Relay
Ignition
SW
ACC
ST2
ACCR
STSW
STAR BatteryECM
± DIAGNOSTICSENGINE
DI±503
697 Author: Date:
2005 SEQUOIA (RM1146U)
Cranking Hold Function Circuit
CIRCUIT DESCRIPTION
The starter is controlled by the ECM, when the ECM detects a start signal (STSW) from the ignition switch,
this system monitors the engine speed (NE) and continues to operate the starter until it has determined that
the engine has started (engine speed reaches approximately 500 rpm). If the engine is already running and
the ignition switch is turned to START, the ECM will not operate the starter.
WIRING DIAGRAM
Refer to DTC P0617 on page DI±298.
INSPECTION PROCEDURE
Hand±held tester:
1 Check operation of engine cranking.
CHECK:
When turning the ignition switch to the START position, check whether the starter motor starts.
OK:
Starter motor starts.
OK Check for intermittent problems (See page
DI±11).
NG
DID8M±01