Dtc 21 / 81 (P1623) / 84 (P1620): Ecm/ Immobilizer Control Module (Ecu) Code Not Matched; Dtc 82 (P1622): Fault In Ecm; Dtc 22: Ignition Switch Circuit Open/Short - Suzuki Liana RH413 Service Manual

10C-15 Immobilizer Control System:
DTC 21 / 81 (P1623) / 84 (P1620): ECM/
Immobilizer Control Module (ECU) Code Not
Matched
Description
• DTC 21
Immobilizer Control Module checks if ECM/
Immobilizer Control Module (ECU) 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 82 (P1622): Fault in ECM

Description
This DTC is set when an internal fault is detected in ECM.
DTC 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 (ECU) code in ECM
by performing procedure described in "Procedure after ECM Replacement".

DTC 22: Ignition Switch Circuit Open/Short

Wiring Diagram
2
2
1
1. Battery
2. Fuse
3. Ignition switch
4. IG fuse (15 A)
Description
Immobilizer Control Module monitors ignition signal when the ignition switch is ON. This DTC is set when no ignition
signal input is detected by Immobilizer Control Module.
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Action
4
BLK/WHT
3
5. Immobilizer Control Module
6. Coil antenna
7. Immobilizer Control Module connector (viewed from harness side)
• DTC 81 (P1623)
ECM checks if ECM/Immobilizer Control Module
(ECU) 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 84 (P1620)
ECM checks if ECM/Immobilizer Control Module
(ECU) 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 (ECU) code registered in ECM, this
DTC is set.
DTC Troubleshooting
Perform procedure described in "Procedure after ECM
Replacement".
Substitute a known-
good ECM and recheck.
See NOTE.
5
G45-2
6
Yes
Repair or replace.
G45
5 3 2 1
7
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No
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I3RH0AA30020-01