Suzuki GA413, Service Manual

Page: 977 / 1246

1. Immobilizer Control Module
2. ECM
8G-18 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
GA413
supple
DTC23 NO ECM/IMMOBILIZER CONTROL MODULE CODE TRANSMITTED
FROM ECM OR DLC CIRCUIT OPENED/SHORTED
DTC83 NO ECM/IMMOBILIZER CONTROL MODULE CODE TRANSMITTED
(P1621) FROM IMMOBILIZER CONTROL MODULE OR DLC CIRCUIT
OPENED/SHORTED
DESCRIPTION:
When the ignition switch is ON, Immobilizer Control Module requests ECM and ECM requests Immobilizer Control
Module to transmit ECM/Immobilizer Control Module code. If ECM/Immobilizer Control Module code is not trans-
mitted from ECM or Immobilizer Control Module, Immobilizer Control Module sets DTC23 and ECM sets DTC83.
INSPECTION:
STEP ACTION YES NO
1 Check voltage between Im-
mobilizer Control Module
coupler terminal E64-7 and
body ground with ignition
switch turned ON.
(See Fig. 1)
Is it 4 – 5V?
Go to Step 2. “Bl/R” wire short.
2 1) Disconnect ECM coupler
with ignition switch turned
OFF.
2) Is there continuity be-
tween Immobilizer Control
Module coupler terminal
E64-7 and serial data link
terminal (L20-9) of ECM
coupler? (For positions of
Data link connector termi-
nal of ECM coupler, refer
to “General Description” in
this section.)
Poor E64-7 terminal connection or poor data link
connector terminal connection (ECM)
If connections are OK, substitute a known-good
ECM or Immobilizer Control Module and recheck.
NOTE:
After replacing with a known-good ECM, reg-
ister ECM/Immobilizer Control Module code
in ECM by performing procedure described
in “Procedure After ECM Replacement”.
After replacing with a known-good Immobiliz-
er Control Module, register ECM/Immobilizer
Control Module code in ECM and Transpond-
er code and ECM/Immobilizer Control Module
code in Immobilizer Control Module by per-
forming procedure described in “Procedure
After Immobilizer Control Module Replace-
ment”.
“Bl/R” wire between
Immobilizer Control
Module and ECM
open.