CHASSIS ELECTRICAL – Ignition Switch and Immobilizer System
54-18
Inspection Procedure 4
Malfunction of the immobilizer-ECU power supply and earth circuit
Measure at the immobilizer-ECU con-
nector B-100.
D Disconnect the connector and
measure at the harness side.
(1) Voltage between 2 and body earth
(Ignition switch: ON)
OK: System voltage
(2) Voltage between 1 and body earth
OK: System voltage
(3) Continuity between 8 and body earth
OK: Continuity
(1) NG
Check the following connectors:
B-76, B-74, B-100
NG
Repair
OK
Check trouble symptoms.
NG
Check the fuse and the harness wire
between the ignition switch (IG) and
immobilizer-ECU.
NG
OK
Check trouble symptoms.
NG
Check the ignition switch.
(Refer to P.54-20.)
(2) NG
Check the following connectors:
B-65, B-100
NG
Repair
OK
Check trouble symptoms.
NG
Check the harness wire between the
immobilizer-ECU and the engine control
relay, and repair if necessary.
(3) NG
Check the following connectors.
B-50, B-100
NG
Repair
OK
Check trouble symptoms.
NG
Check the harness wire between the
immobilizer-ECU and body earth, and
repair if necessary.
Repair
CHECK AT IMMOBILIZER-ECU
TERMINAL VOLTAGE CHECK CHART
Terminal No. Signal Checking requirements Terminal voltage
1 Immobilizer-ECU power supply Ignition switch: ON System voltage
2 Ignition switch-IG Ignition switch: OFF 0V
Ignition switch: ON System voltage
8 Immobilizer-ECU earth Always 0V
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