IMMOBILIZER CONTROL SYSTEM 8G-5
0.5
TIME (sec.)
Ignition switch ON
High
Immobilizer
control system
is normal
Immobilizer
control system
is abnormal
Low
0.5 0.5 0.5 0.5
High
Low
<Vehicle not equipped with monitor coupler>
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.
NOTE:
As soon as the ignition switch is turned ON, ECM and Immobi-
lizer 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 diag-
nosis result is “abnormal”, it immediately changes to flashing
but if the result is “normal”, it remains ON. Diagnosis takes
about 3 seconds at maximum.
When ECM and Immobilizer Control Module detects a trouble, it
stores DTC corresponding to the exact trouble area in ECM and Im-
mobilizer Control Module memory.
DTCs stored in memory of each controller (Immobilizer Control
Module and ECM) can be read by using the procedure described
in “DIAGNOSTIC TROUBLE CODE CHECK (IMMOBILIZER CON-
TROL MODULE)” and “DIAGNOSTIC TROUBLE CODE CHECK
(ECM)” in this section.
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