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DI-498
DIAGNOSTICS - ENGINE IMMOBILISER SYSTEM
DI1KL-08
CIRCUIT INSPECTION
DTC B2785/99 IG Switch ON Malfunction
DTC B2786/99 IG Switch OFF Malfunction
CIRCUIT DESCRIPTION
DTC No. DTC Detection Condition Trouble Area
S Short circuit in IG switch circuit S Ignition switch
B2785/99
S Ignition switch adheres to ON position S EFI main relay
S Open circuit in IG switch circuit S Wire harness
B2786/99
S Ignition switch adheres to OFF position S ECM
WIRING DIAGRAM
I14 ECM
Ignition Driver Side J/B
Switch
4 IGN 10 15
W-R B-R B-L
1I 1F E14 IGSW
7 6
2 J/C
Engine Room D D 1
R/B W-L 1 W-L W-L
IG1 J7 J7 E14 +B
2
AM2
14 4
GR-B GR-B
EFI IG1 E14 MREL
1 L-R
2
2 2 2
1
3 1 Engine Room
2
R/B
EFI
Relay
W
5 2
2 2 J/C
A A
W-B W-B
J2 J1
Battery
EB
I10141
2002 4RUNNER (RM887U)
Author : Date : 674
DI-499
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 the ignition switch ON.
CHECK:
Measure the voltage between terminals +B and E1 of the ECM
connectors.
E1 OK:
(-) (+) Voltage: 9 - 14 V
I02686
OK Proceed to next circuit inspection shown in
problem symptoms (See page DI-497 ).
NG
2 Check for open in harness and connector between terminal E1 of ECM and body
ground (See page IN-28 ).
NG Repair or replace harness or connector.
OK
3 Check EFI main relay (Marking: EFI) (See page SF-35 ).
NG Replace EFI main relay.
OK
4 Check EFI fuse.
NG Check for short in all harness and components
connected to EFI fuse.
OK
2002 4RUNNER (RM887U)
Author : Date : 675
DI-500
DIAGNOSTICS - ENGINE IMMOBILISER SYSTEM
5 Check for open harness and connector between EFI main relay (Marking: EFI)
and battery, and EFI main relay and ECM (See page IN-28 ).
NG Repair or replace harness or connector.
OK
6 Check IGN fuse.
IGN Fuse PREPARATION:
Remove the IGN fuse from the driver side J/B.
CHECK:
Check the continuity of the IGN fuse.
OK:
Continuity
NG Check for short in all harness and components
connected to IGN fuse.
I09233
OK
7 Check ignition switch (See page BE-12 ).
NG Replace ignition switch.
OK
2002 4RUNNER (RM887U)
Author : Date : 676
DI-501
DIAGNOSTICS - ENGINE IMMOBILISER SYSTEM
8 Check for open circuit in harness and connector between ignition switch and EFI
main relay (Marking: EFI), and EFI main relay and body ground (See page
IN-28 ).
NG Repair or replace harness or connector.
OK
Replace ECM.
2002 4RUNNER (RM887U)
Author : Date : 677
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