2001 TOYOTA SEQUOIA check engine

DID51±01
A04550
CG
OP3
DLC3 12345678
9
1011
13 1516 12 14
TC
I28427
Security Indicator
Light MIL
BR3904
Normal System Code
0.25 Sec.0.25 Sec.
I02680
Diagnostic Trouble Code (Example Code 12, 99)
0.5 Sec. 0.5 Sec.
1.5 Sec. 2.5 Sec.
One Cycle4.5 Sec.Repeat
DI±1576
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1770 Author: Date:
2005 SEQUOIA (RM1146U)
DTC CHECK / CLEAR
1. INSPECT DIAGNOSIS
(a) Check the DTC using SST check wire.
(1) Turn the ignition switch ON, but do not start the en-
gine.
(2) When checking DTC 99: Using SST, connect termi-
nals 13 (TC) and 4 (CG) of the DLC3.
(3) When checking codes except DTC 99: Using SST,
connect terminals 8 (OP3) and 4 (CG) of the DLC3.
SST 09843±18040
(4) Read the DTC indicated by the number of times the
security indicator light or the MIL blinks.
HINT:

If no DTC is output, inspect the diagnosis circuits (OP3
and TC) and the security indicator light circuit (See page
DI±1597, DI±1567, DI±1599).

If the system is operating normally, the light blinks twice
per second.

As an example, the blinking patterns of the normal system
code and trouble codes 12 and 99 are shown on the left
and below.

± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1577
1771 Author: Date:
2005 SEQUOIA (RM1146U)
(5) When DTC º99º is output, there is a problem with the
immobiliser. Start troubleshooting referring to the
PROBLEM SYMPTOMS TABLE.
(6) After completing the check, disconnect terminals 8
(OP3) and 4 (CG), or terminals 13 (TC) and 4 (CG),
and turn off the display.
HINT:
If 2 or more trouble codes exist, indication will begin from the
lowest numbered code.
(b) Clear the DTC.
(1) When using diagnosis check wire:

Remove the ECU±B fuse and EFI No. 2 fuse from
the engine room J/B for 1 minute or more.

± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1581
1775 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Has ECU communication ID registration been carried out? (See page BE±137)
NO Carry out ECU communication ID registration
again.
YES
2 Check harness and connector between transponder key ECU and ECM (See
page IN±35)
NG Repair or replace harness or connector.
OK
3 Does the system operate normally after replacement of transponder key ECU?
YES Replace transponder key ECU.
NO
Replace ECM
(See page IN±35).

± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1583
1777 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
When using the hand±held tester, start the inspection from step 1 and when not using the hand±held tester,
start from step 2.
1 Check key unlock warning buckle switch using hand±held tester.
PREPARATION:
Connect the hand±held tester to the DLC 3.
CHECK:
Check the key unlock warning switch using the DATA LIST.
OK Go to step 4.
NG
2 Check key unlock warning switch (See page BE±24 ).
NG Replace key unlock warning switch.
OK
3 Check wire harness and connector between key unlock warning switch and
body ECU (See page IN±35).
NG Repair or replace wire harness or connector.
OK

DI±1584
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1778 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check harness and connector between transponder key ECU and body ECU (See
page IN±35).
NG Repair or replace harness or connector.
OK
Replace transponder key ECU
(See page IN±35).

DI±1586
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1780 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check operation of door courtesy light.
CHECK:
Check that the door courtesy light comes on when the driver's door is opened, and goes off when it is closed.
OK:
The door courtesy light operates normally.
OK Go to step 4.
NG
2 Check driver courtesy light switch (See page BE±40).
NG Replace driver courtesy light switch.
OK
3 Check harness and connector between body ECU and driver door courtesy light
switch (See page IN±35).
NG Repair or replace harness or connector.
OK
4 Check harness and connector between transponder key ECU and body ECU
(See page IN±35).
NG Repair or replace harness or connector.
OK
Replace transponder key ECU (See page IN±35).

DI±1588
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1782 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check ignition switch (See page BE±24).
NG Replace ignition switch.
OK
2 Check harness and connector between ignition switch and transponder key ECU
(See page IN±35).
NG Repair or replace harness or connector.
OK
Replace transponder key ECU (See page IN±35).

DI±1590
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1784 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check whether the engine can be started with the master key and sub±key for
another vehicle of the same type.
RESULT:
AAll keys start the engine.
BA specific key does not start the engine. In this case, DTC
21 or 22 is not stored in memory.
CAll keys do not start the engine. In this case, DTC 21 and 22
are not stored in memory.
A No problem at this time.
HINT:
If the result is ºAº, confirm whether or not the customer has ever
inserted the key (without a transponder chip) of another vehicle
into the ignition key cylinder.
B The transponder chip of a specific key is defec-
tive. Replace the key.
C
2 Check transponder key coil (See page BE±143).
NG Replace transponder key coil.
OK
3 Check harness and connector between transponder key ECU and transponder
key amplifier (See page IN±35).
NG Repair or replace harness or connector.
OK