Suzuki Grand Vitara JB627. Manual - part 63
1A-201 Engine General Information and Diagnosis:
Inspection of ECM and Its Circuits
S6JB0B1104084
ECM and its circuits can be checked by measuring voltage, pulse signal and resistance with special tool connected.
CAUTION
!
ECM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ECM
with ECM connectors disconnected from it.
Voltage Check
1) Remove ECM (1) from its bracket referring to “Engine Control Module (ECM) Removal and Installation in Section
2) Connect special tool (A) between ECM and ECM connectors securely.
Special tool
(A): 09933–06520
3) Check voltage and/or pulse signal using voltmeter (2) and oscilloscope (3).
NOTE
• As each terminal voltage is affected by battery voltage, confirm that it is 11 V or more when ignition
switch is turned ON.
• Voltage with asterisk (*) cannot be measured with voltmeter because it is pulse signal. Use
oscilloscope for its check if necessary.
• Before performed this inspection, be sure to read the “Precautions of ECM Circuit Inspection”.
Viewed from harness side
17 Combination meter operation check
1) Check combination meter operation for seat belt warning
light by fastening and unfastening driver side seat belt
with ignition switch turned ON.
Is it check result satisfactory?
Substitute a known-
good ECM and recheck.
Check BCM power and
ground circuits, If
circuits are OK,
substitute a known-
good BCM and recheck.
Step
Action
Yes
No
3
2
1
(A)
I6JB01110115-03
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C37
E23
I6JB01110064-02