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ECM and Immobilizer Control Module have on-board diagnostic system. Investigate where the trouble is by
referring to "Diagnostic Flow Table" and "Diagnostic Trouble Code (DTC) Table" in this section.
Precautions in Diagnosing Troubles
• Before confirming diagnostic trouble code, do not disconnect connector from ECM, battery cable from bat-
tery, ground wire harness or main fuse.
Such disconnection will erase memorized information in ECM.
• Diagnostic trouble code stored in Immobilizer Control Module memory can be cleared as well as checked by
using SUZUKI scan tool. Before using scan tool, read its Operator's (Instruction) Manual. Carefully to have
good understanding as to what functions are available and how to use it.
• Be sure to read "Precautions for Electrical Circuit Service" in Section 0A before inspection and observe what
is written there.
• There are cases where SVS lamp indicates that some trouble has occurred only temporarily and has gone.
In such case, it may occur that good parts are replaced unnecessarily. To prevent such case, be sure to fol-
low instructions given below when checking by using "Diagnostic Flow Table" in this section.
• When trouble can be identified, it is not an intermittent one: check ignition key, wires and each connector
and if they are all in good condition, substitute a known-good ECM and recheck.
Precautions after Replacing ECM or Immobilizer Control Module
• When ECM is replaced, including when replaced because rechecking by using a known-good ECM is nec-
essary during trouble diagnosis, secret key and password must be registered in ECM by performing proce-
dure described in "Procedure after ECM replacement" in this section.
• When Immobilizer Control Module is replaced, including when replaced because rechecking by using a
known-good Immobilizer Control Module is necessary during trouble diagnosis, transponder fix code, secret
key and/or password must be registered in Immobilizer Control Module by performing procedure described
in "Procedure after Immobilizer Control Module replacement" in this section.
IMMOBILIZER CONTROL SYSTEM (Z13DT ENGINE MODEL) 8G3-7
Diagnosis
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