Toyota Sequoia (2005). Manual - part 451

I24837

IG

Transponder Key ECU

D

3

T16

O

J43 
J/C

W–L

8

OP3

D6
DLC3

CG

4

A

A

O

–

DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

DI–1599

1793

Diagnosis Circuit

CIRCUIT DESCRIPTION

This circuit sends a signal to the ECU that outputs DTCs.

WIRING DIAGRAM

DIABK–03

A04550

CG

OP3

1 2 3 4 5 6 7 8

9 1011

13 1516

12 14

DI–1600

–

DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

1794

INSPECTION PROCEDURE

1

Check voltage between terminals OP3 and CG

 

of DLC3.

PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals OP3 and CG of the
DLC3.
OK:

Voltage: 10 to 14 V

OK

Proceed to next circuit inspection shown in
problem symptoms table (See page 

DI–1573

).

NG

2

Check harness and connector between transponder key ECU and DLC3, DLC3
and body ground (See page 

IN–35

).

NG

Repair or replace harness or connector.

OK

Replace transponder key ECU 
(See page 

IN–35

).

DID8N–01

–

DIAGNOSTICS

COMBINATION METER SYSTEM

DI–1601

1795

COMBINATION METER SYSTEM

PRECAUTION

NOTICE:
When disconnecting the battery terminal, initialize the following system after the terminal is recon-
nected.

System Name

See Page

Back Door Power Window Control System

BE–77

DID8O–01

I28426

Fuel Tank

 Fuel Sender Gauge

DI–1602

–

DIAGNOSTICS

COMBINATION METER SYSTEM

1796

LOCATION