10C-14 Immobilizer Control System:
DTC P1622: EEPROM Error
S5JB0EA304013
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram: ”
Detecting Condition and Trouble Area
Troubleshooting
1) Clear DTC(s) referring to “Diagnostic Trouble Code (DTC) Clearance: in related manual”.
2) Turn the ignition switch to OFF position.
3) Check if DTC P1622 is still detected referring to “Diagnostic Trouble Code (DTC) Check: in related manual”. 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 in
related manual”.
5) Perform “Procedure after ECM Replacement: in related manual”.
DTC P1623: Unregistered Transponder
S5JB0EA304014
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram: ”
Detecting Condition and Trouble Area
Troubleshooting
14 Immobilizer control module (ICM) check
1) Check immobilizer control module (ICM) referring to
“Inspection of Immobilizer Control Module (ICM) and Its
Circuit: in related manual”.
Is immobilizer control module (ICM) normal?
Replace ECM with new
one referring to “Engine
Control Module (ECM)
Removal and
Installation: in Section
1C in related manual”,
and then perform
“Procedure after ECM
Replacement: in related
manual”.
Replace immobilizer
control module (ICM)
with new one referring
to “Immobilizer Control
Module (ICM) Removal
and Installation: in
related manual”.
Step Action Yes No
Detecting Condition Trouble Area
EEPROM in ECM is corrupted. Internal failure (EEPROM corruption) of ECM
Detecting Condition Trouble Area
Transponder code in the transponder built in the ignition
key is invalid.
• Use of the unregistered ignition key
• Immobilizer control module (ICM) faulty
• ECM faulty
Step Action Yes No
1 Diagnostic Trouble Code (DTC) confirmation
1) Clear DTC(s) referring to “Diagnostic Trouble Code
(DTC) Clearance: in related manual”.
2) Turn the ignition switch to OFF position.
3) Check if any DTC is detected referring to “Diagnostic
Trouble Code (DTC) Check: in related manual”.
Is DTC P1623 still detected?
Go to Step 2. The troubleshooting is
completed.
2 Diagnostic Trouble Code (DTC) check
Is any DTC other than P1623 is detected in Step 1?
Perform the
troubleshooting
referring to the
corresponding
flowchart, and then go
to Step 3.
Go to Step 3.
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