Suzuki GA413, Service Manual

Page: 979 / 1246

INSPECTION OF ECM, IMMOBILIZER CON-
TROL MODULE AND ITS CIRCUIT
ECM, Immobilizer Control Module and its circuit can be checked
at ECM wiring couplers and Immobilizer Control Module wiring
coupler by measuring voltage. Described here is only inspection
of Immobilizer Control Module. For inspection of ECM, refer to Sec-
tion 6E.
CAUTION:
Immobilizer Control Module cannot be checked by itself.
It is strictly prohibited to connect voltmeter or ohmmeter
to Immobilizer Control Module with coupler discon-
nected from it.
Voltage Check
1) Remove Immobilizer Control Module, referring to “IMMOBILIZ-
ER CONTROL MODULE” for removal in this section.
2) Connect Immobilizer Control Module coupler to Immobilizer
Control Module.
3) Check voltage at each terminal of coupler connected.
NOTE:
As each terminal voltage is affected by the battery voltage,
confirm that it is 11V or more when ignition switch is ON.
1. Immobilizer Control Module
2. Immobilizer Control Module coupler
3. Body ground
8G-20 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
GA413
supple
TERMINAL CIRCUIT
NORMAL
VOLTAGE
CONDITION
E64 1 Ignition signal
10 – 14V Ignition switch ON
E64-1 Ignition signal
0 – 0.8V Ignition switch OFF
E64-2 Power source 10 – 14V Ignition switch ON
E64-3 Coil antenna 1 0V Ignition switch ON
E64-4 Coil antenna 2 0V Ignition switch ON
E64-5
E64-6
Blank –– ––
E64-7
Data link connector
(Serial data terminal)
4 – 5V Ignition switch ON
E64-8 Ground –– ––
E64-9 Blank –– ––
E64 10 Diagnosis output
0 – 14V Ignition switch ON
E64-10 Diagnosis output
0V Ignition switch OFF
NOTE:
When measuring voltage at E64-4 and E64-3 terminals with ignition switch turned ON, be sure to turn igni-
tion switch ON before connecting positive probe of voltmeter to E64-4 or E64-3 terminal. If it is not turned
ON first, DTC13 (Diagnostic Trouble Code 13) may be indicated.