Diagnosis; Precautions In Diagnosing Troubles - Suzuki sq-416-420-625 Service Manual

8G-6 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
1. Immobilizer diagnostic coupler

DIAGNOSIS

ECM/PCM and Immobilizer Control Module have on-board diag-
nostic system (a system self-diagnosis function) as described pre-
viously.
Investigate where the trouble is by referring to "Diagnostic Flow
Table" and "Diagnostic Trouble Code Table" on later pages.

PRECAUTIONS IN DIAGNOSING TROUBLES

[PRECAUTIONS IN IDENTIFYING DIAGNOSTIC TROUBLE CODE]
ECM/PCM
<Vehicle equipped with monitor coupler>
D Before identifying diagnostic trouble code indicated by malfunc-
tion indicator lamp, don't disconnect couplers from ECM/PCM,
battery cable from battery, ECM/PCM ground wire harness from
engine.
Such disconnection will clear trouble codes for electronic fuel in-
jection system stored in memory of ECM/PCM.
D If abnormality or malfunction lies in two or more areas, malfunc-
tion indicator lamp indicates applicable codes three times each.
And flashing of these codes is repeated as long as diagnosis ter-
minal is grounded and ignition switch is held at ON position.
D When ECM/PCM detects a trouble in both electronic fuel injec-
tion system and immobilizer control system, malfunction indicator
lamp indicates trouble codes of both systems alternately while the
ignition switch is turned ON and the diagnosis terminal is
grounded.
D Take a note of diagnostic trouble code indicated first.
<Vehicle not equipped with monitor coupler>
D Before identifying diagnostic trouble code indicated through Su-
zuki scan tool, don't disconnect couplers from ECM/PCM, bat-
tery cable from battery, ECM/PCM ground wire harness from en-
gine.
Such disconnection will clear trouble codes for electronic fuel in-
jection system stored in memory of ECM/PCM.
D Take a note of diagnostic trouble code indicated first.
Immobilizer Control Module
D Take a note of diagnostic trouble code indicated first.