Dtc P1622: Eeprom Reading / Writing Error; Dtc P1623: Unregistered Transponder - Suzuki Swift Sport 2004 Service & Repair Manual

10C-13 Immobilizer Control System:
Step
4 ICM and ECM connector check
1) With the ignition switch at OFF position, check
intermittent and poor connection of ICM connector and
ECM connectors referring to "Intermittent and Poor
Connection Inspection in Section 00".
Is each connector in good condition?
5 Communication circuit check between ICM and ECM
1) Check for open, short and high resistance in serial
communication and clock circuit between ICM and ECM.
Is each communication circuit in good condition?

DTC P1622: EEPROM Reading / Writing Error

Detecting Condition and Trouble Area
Detecting Condition
EEPROM in ECM is corrupted.
DTC Confirmation Procedure
1) Turn ignition switch to ON position.
2) Check DTC in 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 "ECM Removal and Installation in Section 1C".
5) Perform "Procedure after ECM Replacement".

DTC P1623: Unregistered Transponder

Detecting Condition and Trouble Area
Detecting Condition
Transponder code in the transponder built in the ignition
key is invalid.
DTC Confirmation Procedure
1) Turn ignition switch to ON position.
2) Check DTC in ECM.
Troubleshooting
Step
1 Was "Immobilizer Control System Check" performed?
2 DTC check of ECM
Is DTC other than P1623 detected?
Action
Action
Yes
Go to Step 5.
Substitute a known-
good ICM and recheck.
If DTC P1621 is still
detected, substitute a
known good ECM and
recheck.
Trouble Area
ECM
Trouble Area
• Use of unregistered ignition key
• Ignition key
• ICM
• ECM
Yes
Go to Step 2.
Go to applicable DTC
diag. flow.
No
Repair poor connection.
Repair circuit.
S7RS0BA304013
S7RS0BA304014
No
Go to "Immobilizer
Control System Check".
Go to Step 3.