Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eisy cib27859
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DI-615
DIAGNOSTICS - ENGINE IMMOBILISER SYSTEM
DI1KL-07
CIRCUIT INSPECTION
DTC B2785/99 IG Switch ON Malfunction
DTC B2786/99 IG Switch OFF Malfunction
CIRCUIT DESCRIPTION
DTC No. DTC Detecting Condition Trouble Area
S Short circuit in IG switch circuit
B2785/99 S IG switch
S IG switch adheres to ON position
S EFI Main Relay
M i R l
S Open circuit in IG switch circuit
B2786/99 S Wireharness
S IG switch adheres to OFF position
WIRING DIAGRAM
Driver Side J/B No.1 ECM
3 IGN 7 2
B-R B-O
6 1K 1W E8 IGSW
IG2 J/B No.3
11 2 16
B-R B-R
AM2 3B 3B E8 +B
7 5 5
1K 1B 8
W-R Y-G
W E8 MREL
Ignition
Switch
Engine Room J/B
No.2 4 2L 2 2J 2K 7
EFI 3 1
Relay
AM2
EFI
5 2
3 2B 5 2C 2F 4
FL MAIN
B-L W
W-B W-B
Battery
EE EA
I09501
2001 SIENNA (RM787U)
Author : Date : 769
DI-616
DIAGNOSTICS - ENGINE IMMOBILISER SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminals + B and E1 of ECM connectors.
PREPARATION:
+B (+) (a) Remove the glove compartment.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals + B and E1 of ECM con-
nectors.
E1 (-) OK:
Voltage: 9 - 14 V
I02686
OK Proceed to next circuit inspection shown in
problem symptoms (See page DI-614 ).
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 (See page SF-64 ).
NG Replace EFI main relay.
OK
2001 SIENNA (RM787U)
Author : Date : 770
DI-617
DIAGNOSTICS - ENGINE IMMOBILISER SYSTEM
4 Check EFI fuse.
NG Check for short in all the harness and compo-
nents connected to EFI fuse.
OK
5 Check for open harness and connector between EFI main relay (Marking : EFI)
and battery, 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 IGN fuse.
OK:
Continuity
Instrument Panel J/B
NG Check for short in all the harness and compo-
nents connected to IGN fuse.
S04164
OK
2001 SIENNA (RM787U)
Author : Date : 771
DI-618
DIAGNOSTICS - ENGINE IMMOBILISER SYSTEM
7 Check ignition switch (See page BE-15 ).
NG Replace ignition switch.
OK
8 Check for open circuit in harness and connector between ignition switch and EFI
main relay, EFI main relay and body ground (See page IN-31 ).
NG Repair or replace wirharness and connector.
OK
Replace ECM.
2001 SIENNA (RM787U)
Author : Date : 772
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