Table of Contents
Advertisement
8G-4 IMMOBILIZER CONTROL SYSTEM
Malfunction Indicator Lamp
Immobilizer
ON
control system
is normal
OFF
Immobilizer
ON
control system
is abnormal
OFF
On-Board Diagnostic System Description
Immobilizer Control Module and ECM diagnose troubles which
may occur in the area including the following parts when the igni-
tion switch is ON.
ECM:
Immobilizer Control Module:
With the ignition switch turned ON (but the engine at stop) regard-
less of the condition of the engine and emission control system,
ECM indicates whether a trouble has occurred in the immobilizer
control system or not by causing the immobilizer indicator lamp to
flash or turn ON.
Immobilizer indicator lamp is ON:
No trouble exists in the immobilizer control system.
Immobilizer indicator lamp is flashing:
ECM or Immobilizer Control Module has detected some trouble in
the immobilizer control system.
Ignition switch ON
0.5
TIME (sec)
When ECM and Immobilizer Control Module detects a trouble, it
stores DTC in ECM and Immobilizer Control Module memories
respectively.
DTCs stored in memory of each controller (Immobilizer Control
Module and ECM) can be read by using the procedure described
in "DTC Check" in this section.
• ECM/Immobilizer Control Module code
• Serial data link circuit
• ECM
• Transponder code
• Coil antenna
• ECM/Immobilizer Control Module code
• Serial data link circuit
• Immobilizer Control Module
• Ignition signal
NOTE:
As soon as the ignition switch is turned ON, ECM and
Immobilizer Control Module diagnose if a trouble has
occurred in the immobilizer control system. While the
diagnosis is being made, the immobilizer indicator lamp
stays ON and if the diagnosis result is "abnormal", it
immediately changes to flashing but if the result is "nor-
mal", it remains ON. To complete diagnosis, it takes
about three seconds at maximum.
Advertisement
Table of Contents
