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10C-10 Immobilizer Control System:
Step
13 Check for short of "YEL/BLK" and "YEL/RED" wires:
1) With immobilizer control module connector "G24" and
ECM connector "E23" disconnected, check resistance
between "G24-3" wire terminal and "G24-4" wire terminal
at immobilizer control module connector.
Is resistance infinite?
14 Check for fault of immobilizer control module:
1) Check immobilizer control module referring to
"Inspection of Immobilizer Control Module and Its Circuit:
".
Is immobilizer control module normal?
DTC P1622 EEPROM Error
Possible Cause and Trouble Area
Possible Cause
• Temporary error
• Internal failure (EEPROM corruption) of ECM
Troubleshooting
1) Clear DTC(s) referring to "Diagnostic Trouble Code (DTC) Clearance: ".
2) Turn the ignition switch to OFF position.
3) Check if DTC P1622 is still detected referring to "Diagnostic Trouble Code (DTC) Check: ". If still detected, go to
the next step. If not, the troubleshooting is completed.
4) Replace ECM with new one referring to "Engine Control Module (ECM) Removal and Installation: in Section 1C".
5) Perform "Procedure after ECM Replacement: ".
DTC P1623 Unregistered Transponder
Possible Cause and Trouble Area
Possible Cause
• Temporary error
• Use of the unregistered ignition key
• Immobilizer control module faulty
• ECM faulty
Troubleshooting
Step
1
Diagnostic Trouble Code (DTC) confirmation:
1) Clear DTC(s) referring to "Diagnostic Trouble Code
(DTC) Clearance: ".
2) Turn the ignition switch to OFF position.
3) Check if any DTC is detected referring to "Diagnostic
Trouble Code (DTC) Check: ".
Is DTC P1623 still detected?
2
Diagnostic Trouble Code (DTC) check:
1) Check if any DTC other than P1623 is detected referring
to "Diagnostic Trouble Code (DTC) Check: ".
Is any DTC other than P1623 is detected?
Action
Action
Yes
Go to Step 14.
Replace ECM with new
one referring to "Engine
Control Module (ECM)
Removal and
Installation: in Section
1C", and then perform
"Procedure after ECM
Replacement: ".
Trouble Area
ECM
Trouble Area
• Transponder in the ignition key
• Immobilizer control module
• ECM
Yes
Go to Step 2.
Perform troubleshooting
referring to the
corresponding flowchart
in this section, and then
go to Step 3.
No
Repair short of "YEL/
BLK" and "YEL/RED"
wires.
Replace immobilizer
control module with new
one referring to
"Immobilizer Control
Module Removal and
Installation: ".
S4RS0AA304030
S4RS0AA304031
No
The troubleshooting is
completed.
Go to Step 3.
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