Toyota Sequoia (2005). Manual - part 449

–

DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

DI–1591

1785

4

Does the system operate normally after replacement of transponder key ECU?

YES

Replace transponder key ECU.

NO

Replace ECM (See page 

IN–35

).

DI–1592

–

DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

1786

Code 31, 35, 36 or 37 is output.

CIRCUIT DESCRIPTION

These DTCs are indicated when an unregistered key is inserted. When any of them is indicated, clear the
DTC and insert other registed keys to check for DTCs.
When a key that outputs a DTC (31, 35, 36 or 37) is found, register this key. When a DTC (31, 35, 36 or 37)
is not output, there is a possibility that the unregistered key has been inserted before. (The ECM is normal.)
Ask the customer under what conditions the problem occurred to find the cause.
(Example: Another key has been inserted, etc.)

DTC No.

DTC Detecting Condition

Trouble Area

31, 35, 36, 37

Unmatched key code

Key

INSPECTION PROCEDURE

1

Delete DTC and insert all the presently available keys to check whether the en-
gine starts or not (See page 

DI–1576

).

HINT:
When inserting a key that does not start the engine, a DTC (31, 35, 36 or 37) is stored in memory.

RESULT:

OK

All keys start the engine.

NG

A specific key does not start the engine.

OK

No problem.

HINT:
If the result is ”OK”, confirm whether or not the customer ever
inserted an unregistered key or the immobiliser key (with a
transponder chip) of another vehicle into the ignition key cylin-
der, and find out the cause of the detection of the DTC.

NG

Register the key that does not start the en-
gine

 (See page 

BE–137

)

.

DIABH–04

I24830

ECM

T16
Transponder Key ECU

IMI

IMO

16

15

P–G

11

10

EFIO

EFII

L–Y

E5

E5

–

DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

DI–1593

1787

Code 32 or 33 is output

CIRCUIT DESCRIPTION

The transponder key ECU indicates DTC 32 when a key without a key code is inserted, and indicates DTC
33 when a key code cannot be identified.
HINT:
DTCs 32 and 33 are abnormal codes.

DTC No.

DTC Detecting Condition

Trouble Area

32, 33

Communication error

Key

Transponder key ECU

Wire harness

WIRING DIAGRAM

DIABI–04

DI–1594

–

DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

1788

INSPECTION PROCEDURE

1

Check whether the engine can be started with a spare key of the same vehicle.

YES

Replace key.

NO

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

).