Suzuki Ignis Service Manual page 3812

DTC21: ECM/Immobilizer Control Module Code Not Matched (Immobilizer
Control Module Side)
DTC P1623: ECM/Immobilizer Control Module Code Not Matched (ECM Side)
DTC P1620: ECM/Immobilizer Control Module Code Not Registered
DTC Detecting Condition
• DTC21
Immobilizer Control Module checks if ECM/Immobilizer Control Module code transmitted from ECM and that
registered in Immobilizer Control Module match when ignition switch is ON. If they do not, this DTC is set.
• DTC P1623
ECM checks if ECM/Immobilizer Control Module code transmitted from Immobilizer Control Module and that
registered in ECM match when ignition switch is ON. If they do not, this DTC is set.
• DTC P1620
ECM checks if code transmitted from Immobilizer Control Module and that registered in ECM match when
ignition switch is ON. If there is no ECM/Immobilizer Control Module code registered in ECM, this DTC is
set.
Troubleshooting
Perform procedure described in "Procedure After ECM Replacement" in the section.
DTC P1622: Fault in ECM
DTC Detecting Condition
This DTC is set when an internal fault is detected in ECM.
Troubleshooting
Step
1 1) Ignition switch OFF.
2) Disconnect connectors from ECM.
3) Check for proper connection to ECM
at all terminals.
Are they in good condition?
NOTE:
After replacing with a known-good ECM, register ECM/Immobilizer Control Module code in ECM by
performing procedure described in "Procedure After ECM Replacement" in this section.
Action Yes
Substitute a known-good ECM and
recheck.
See NOTE below.
IMMOBILIZER CONTROL SYSTEM 8G-15
No
Repair or replace.