Suzuki SX4 Service Manual page 79

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Troubleshooting
Step
1
Scan tool check
1) Disconnect scan tool from DLC with ignition switch
turned OFF.
2) Check for proper connection to all terminals of scan tool
connector.
3) If OK, connect scan tool to another vehicle of this type
with ignition switch turned OFF.
4) Check communication between scan tool and ECM by
DTC check in ECM.
Is it possible to check DTC in ECM?
2
DLC power circuit check
1) Check for proper connection to all DLC (1) terminals with
ignition switch turned OFF.
2) If OK, measure voltage between +B terminal (2) of DLC
and vehicle body ground with ignition switch turned to
ON position.
1
16
Is voltage 10 – 14 V?
3
DLC ground circuit check
1) Ignition switch turn to OFF position.
2) Check DLC (1) ground circuits as follows.
• Measure resistance between signal ground terminal
(2) of DLC and vehicle body ground.
• Measure resistance between body ground terminal (3)
of DLC and vehicle body ground.
1
16
Is resistance 1
or less?
4
DTC Check
1) Turn ignition switch to OFF position.
2) Connect scan tool to DLC.
3) Check DTC in the following control modules that
communicate with scan tool by K-line.
• ESP® control module
• BCM
• Keyless start control module
• 4WD control module
Is there any DTC other than CAN-DTC?
Action
2
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
3
2
Engine General Information and Diagnosis:
Yes
Go to Step 2.
Go to Step 3.
I7RW01110096-01
Go to Step 4.
I7RW01110097-01
Go to applicable
troubleshooting of DTC
other than CAN-DTC.
1A-29
No
Scan tool faulty. Refer
to its operator's manual.
Repair power circuit.
Repair ground circuit(s).
Go to Step 5.

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