Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg ciecmpow
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DI-144
DIAGNOSTICS - ENGINE
DI22L-03
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to the coil, closing the contacts of
the EFI main relay (Marking: EFI) and supplying power to terminal +B of the ECM.
WIRING DIAGRAM
ECM
Driver Side J/B No.1
3 IGN 7 2 IGSW
B-R B-O
1K 1W E8
7
6
Ignition
8
Switch
Y-G MREL
E8
J/B No.3
5 5
7 W-R W 11 2 16
1K 1B B-R B-R +B
3B 3B E8
4 2L 2 2J 2K 7
3 1
EFI Engine Room
AM2
Relay J/B No.2
5 2
EFI 4
3 2B 2C 5 J14
Junction
FL Connector
MAIN 17
B-L W BR BR
W-B
E11 E1
A A
Battery
EE EC
A07530
2001 SIENNA (RM787U)
Author : Date : 298
DI-145
DIAGNOSTICS - ENGINE
INSPECTION PROCEDURE
1 Check voltage between terminals + B and E1 of ECM connectors.
PREPARATION:
E1 (-) +B (+)
(a) Remove the glove compartment (See page SF-83 ).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals + B and E1 of the ECM
connectors.
OK:
Voltage: 9 - 14 V
BE6653
P23885 A02382
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-21 ).
NG
2 Check for open in harness and connector between terminal E1 of ECM and body
ground (See page IN-31 ).
NG Repair or replace harness or connector.
OK
3 Check EFI main relay (Marking: EFI) (See page SF-64 ).
NG Replace EFI main relay.
OK
4 Check EFI fuse (See page DI-135 ).
NG Check for short in all the harness and
components connected to EFI fuse.
OK
2001 SIENNA (RM787U)
Author : Date : 299
DI-146
DIAGNOSTICS - ENGINE
5 Check for open harness and connector between EFI main relay (Marking: EFI)
and battery, and EFI main relay (Marking: EFI) and ECM (See page IN-31 ).
NG Repair or replace harness or connector.
OK
6 Check IGN fuse.
PREPARATION:
IGN Fuse
Remove the IGN fuse from the instrument panel J/B.
CHECK:
Check continuity of the IGN fuse.
OK:
Continuity
NG Check for short in all the harness and
components connected to IGN fuse.
Instrument Panel J/B
S04164
OK
7 Check ignition switch (See page BE-15 ).
NG Replace ignition switch.
OK
Check for open in harness and connector be-
tween IG switch and EFI main relay, EFI main
relay and body ground (See page IN-31 ).
2001 SIENNA (RM787U)
Author : Date : 300
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