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Precautions in Diagnosing Troubles
ECM
• Before identifying diagnostic trouble code indicated through Suzuki Scan Tool, don't disconnect couplers
from ECM, battery cable from battery, ECM ground wire harness from engine.
Such disconnection will clear trouble codes for engine and emission control system and immobilizer control
system stored in memory of ECM.
• Take a note of diagnostic trouble code indicated first.
Immobilizer Control Module
• Take a note of diagnostic trouble code indicated first.
Intermittent troubles
• There is case where Suzuki Scan Tool indicates a diagnostic trouble code representing a trouble which
occurred only temporarily and has gone. In such case, good parts may be replaced unnecessarily. To pre-
vent such replacement, be sure to follow instructions given below during performance of "Immobilizer Con-
trol System Check".
– When trouble can be identified, it is not an intermittent one:
Check coil antenna, ignition key, wires and each connection and if they are all in good condition, substi-
tute a known-good ECM and recheck.
– When trouble can not be identified but Suzuki Scan Tool indicate a trouble code:
Diagnose trouble by using that code No. and if ignition key, coil antenna, wires and each connection are
all in good condition, turn OFF ignition switch and then ON.
• Then, check what Suzuki Scan Tool indicates. Only when they indicate trouble code again, substitute a
known-good ECM or Immobilizer Control Module and check again.
If they do not indicate any trouble code but normal code, it means that an intermittent trouble did occur and
has gone. In this case, check wires and connections carefully again.
• When checking for continuity, be careful not to damage terminal. Damage of terminal might cause irregular
contact. As a result of the irregular contact, immobilizer control system might fail to operate properly.
Diagnosis
IMMOBILIZER CONTROL SYSTEM 8G-5
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