Inspection Of Ecm And Its Circuits - Suzuki SX4 Service Manual

1A-172 Engine General Information and Diagnosis:
Step
15 CAN communication check of 4WD control module
1) Turn ignition switch to OFF position.
2) Connect combination meter connector and 4WD control
module.
3) Perform "Communication Bus Check" under "Bus
Check" on SUZUKI-SDT with ignition switch turned ON.
Are all of BCM, ECM, ABS / ESP
combination meter, TCM, keyless start control module, yaw
rate / G sensor, combination meter and 4WD control module
normally displayed?
16 CAN communication check of steering angle sensor
(ESP® model)
1) Turn ignition switch to OFF position.
2) Connect steering angle sensor connector.
3) Perform "Communication Bus Check" under "Bus
Check" using SUZUKI-SDT with ignition switch turned
ON.
Are all of BCM, ECM, ABS / ESP
combination meter, TCM, keyless start control module, yaw
rate / G sensor and steering angle sensor normally
displayed?

Inspection of ECM and Its Circuits

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
1C".
2) Connect special tool between ECM and ECM connectors securely.
Special tool
(A): 09933–06320
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 this inspection, be sure to read the "Precautions of ECM Circuit Inspection".
Action
®
control module,
®
control module,
Yes
Go to Step 16.
Recheck DTC.
No
Check power and
ground circuits of 4WD
control module referring
to "Step 2" and "Step 3"
under "DTC C1240:
4WD Control Module
Power Supply Circuit
Malfunction in Section
3B". If OK, substitute a
known-good 4WD
control module.
Check power and
ground circuit of
steering angle sensor
referring to "Step 4" and
"Step 5" under "DTC
C1037: Steering Angle
Sensor Power Supply
Failure in Section 4F". If
OK, substitute a known-
good steering angle
sensor.
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