Toyota Sequoia (2005). Manual — part 444
DI1AJ–49
Vehicle Brought to Workshop
Customer Problem Analysis
Check and Clear DTC
Items inside
are titles of pages in this manual,
with the page number in the bottom portion. See
the pages for detailed explanations.
Problem Symptom Confirmation
Symptom Simulation
Symptom
does not occur
Symptom
occurs
DTC Check
Circuit Inspection and Part Inspection
DTC Chart
Problem Symptoms Table
Identification of Problem
Repair
Confirmation Test
End
1
2
3
4
6
7
7
8
9
10
P.
P.
P.
P.
P.
P.
P.
Multiplex Communication System Inspection *
5
P.
*: Confirm that there is no trouble
by DTC check.
Normal system code
Trouble code
–
DIAGNOSTICS
ENGINE IMMOBILISER SYSTEM
DI–1571
1765
HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
The ECU of this system is connected to the multiplex communication system. Therefore, before starting trou-
bleshooting, make sure to check that there is no trouble in the multiplex communication system.
Troubleshoot in accordance with the following procedures:
DI1AK–28
ENGINE IMMOBILISER Check Sheet
Inspector’s
Name
:
Customer’s Name
Licence Plate No.
VIN
Production Date
Odometer Reading
/ /
/ /
Frequency Problem Occurs
/ /
Continuous
Intermittent ( times a day)
DTC Check
1st Time
2nd Time
Normal System Code
Trouble Code (Code )
Normal SystemCode
Trouble Code (Code )
Symptoms
km
miles
Engine does not start.
Check Item
Malfunction
Indicator Lamp
Normal
Remains ON
Does not Light Up
Immobiliser is not set.
(Engine starts with key codes other than the registered key code.)
Security indicator is always ON.
Security indicator is always ON. (Although code has been registered in the
automatic registration mode, indicator is not OFF.)
Security indicator is OFF.
(When DTC of immobiliser is output)
Security indicator is OFF.
(When DTC of immobiliser is not output)
Security indicator is abnormally blinking.
No code is output.
DI–1572
–
DIAGNOSTICS
ENGINE IMMOBILISER SYSTEM
1766
CUSTOMER PROBLEM ANALYSIS CHECK
DI1AP–40
–
DIAGNOSTICS
ENGINE IMMOBILISER SYSTEM
DI–1573
1767
PROBLEM SYMPTOMS TABLE
Symptom
Suspected Area
See page
Immobiliser is not set.
(Engine starts with key codes other than the registered key code.)
1. Door courtesy light switch circuit (DTC12)
2. Transponder key ECU
Engine does not start.
1. Key
2. Key unlock warning switch circuit (DTC11)
3. Transponder key coil
4. Transponder key ECU
5. ECM
*1
Security indicator is always ON.
1. Security indicator
2. Security indicator light circuit
3. Transponder key ECU
*2
Security indicator is always ON.
(Although code has been registered in the automatic registration
mode, indicator is not OFF.)
1. Transponder key coil
2. Transponder key ECU
Security indicator is OFF.
(When DTC of immobiliser is output)
1. Transponder key coil
2. Transponder key ECU
Security indicator is OFF.
(When DTC of immobiliser is not output)
1. Security indicator light circuit
2. Diagnosis circuit
3. Transponder key ECU
Security indicator is abnormally blinking.
Transponder key ECU
No code is output.
1. Power source circuit
2. Diagnosis circuit
3. Transponder key ECU
*1 : Check that the key which did not start the engine has been registered, and that it is possible to start with
any other already registered key.
*2 : Finish the automatic registration mode because the mode might still be set.
DIABB–02
I24389
T16
Transponder Key ECU:
DI–1574
–
DIAGNOSTICS
ENGINE IMMOBILISER SYSTEM
1768
TERMINALS OF ECU
Symbols (Terminals No.)
Wiring Color
Condition
Specified condition
+B
↔
GND
(T16 – 1
↔
T16 – 14)
W–R
↔
O
Always
10 to 14 V
IG
↔
GND
(T16 – 2
↔
T16 – 14)
B–O
↔
O
Ignition switch ON
10 to 14 V
D
↔
GND
W L
O
Ignition switch ON
→
10 to 14 V
→
D
↔
GND
(T16 – 3
↔
T16 – 14)
W–L
↔
O
Ignition switch ON
→
Connect terminals OP3 and CG of DLC3
10 to 14 V
→
Below 2 V
CODE
↔
GND
(T16 – 4
↔
T16 – 14)
R–Y
↔
O
Ignition switch ON
10 to 14 V
RXCK
↔
GND
(T16 – 5
↔
T16 – 14)
LG
↔
O
Ignition switch ON
10 to 14 V
VC12
↔
AGND
(T16 – 6
↔
T16 – 12)
GR–B
↔
GR–L
Always
10 to 14 V
IND
↔
GND
LG B
O
Security indicator light is on. (It flashes when the immobiliser
t
i
ti
)
3 to 6 V
→
IND
↔
GND
(T16 – 7
↔
T16 – 14)
LG–B
↔
O
system is operating.)
→
Security indicator light is off.
3 to 6 V
→
Below 1 V
CTY
↔
GND
GR L
O
Driver’s door closed
→
10 to 14 V
→
CTY
↔
GND
(T16 – 8
↔
T16 – 14)
GR–L
↔
O
Driver s door closed
→
Driver’s door open
10 to 14 V
→
Below 1 V
KSW
↔
GND
Y G
O
Key unlock warning switch ON (Key inserted)
→
Below 1 V
→
KSW
↔
GND
(T16 – 9
↔
T16 – 14)
Y–G
↔
O
Key unlock warning switch ON (Key inserted)
→
Key unlock warning switch OFF (Key not inserted)
Below 1 V
→
10 to 14 V
EFII
↔
GND
(T16 –10
↔
T16 – 14)
L–Y
↔
O
Ignition switch ON
10 to 14 V
EFIO
↔
GND
(T16 –11
↔
T16 – 14)
P–G
↔
O
Ignition switch ON
10 to 14 V
AGND
↔
Body ground
(T16 –12
↔
Body
ground)
GR–L
↔
Body ground
Always
Below 1 V
TXCT
↔
GND
(T16 – 13
↔
T16 – 14)
Y–G
↔
O
Ignition switch ON
10 to 14 V
GND
↔
Body ground
(T16 –14
↔
Body
ground)
O
↔
Body ground
Always
Below 1 V
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