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 P1622 Fault In Ecm - Suzuki Ignis Service Manual

8G-16 IMMOBILIZER CONTROL SYSTEM
DTC21 ECM/IMMOBILIZER CONTROL MODULE CODE NOT MATCHED (IMMO-
BILIZER CONTROL MODULE SIDE)
DTC P1623 ECM/IMMOBILIZER CONTROL MODULE CODE NOT MATCHED
(ECM SIDE)

DTC P1620 ECM/IMMOBILIZER CONTROL MODULE CODE NOT REGISTERED

DESCRIPTION
• 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.
INSPECTION
Perform procedure described in "PROCEDURE AFTER ECM REPLACEMENT" in the section.

DTC P1622 FAULT IN ECM

DESCRIPTION
This DTC is set when an internal fault is detected in ECM.
INSPECTION
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.
No
Repair or replace.