Suzuki 2006 SX4, Service Manual

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Engine General Information and Diagnosis: 1A-31
Trouble area
• Scan tool
• Connector related to CAN line (included in DLC)
• CAN line
• Power or ground circuit of DLC
• Control module communicated by CAN
– ECM
– TCM
– ABS control module
– BCM
– Combination meter
– Keyless start control module
– 4WD control module
• Power or ground circuit of control module
communicated by CAN
Troubleshooting
Step Action Yes No
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?
Go to Step 2. Scan tool faulty. Refer
to its operator’s manual.
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 bB terminal (2) of DLC
and vehicle body ground with ignition switch turned to
ON position.
Is voltage 10 – 14 V?
Go to Step 3. Repair power circuit.
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.
Is resistance 1
Ω
or less?
Go to Step 4. Repair ground circuit(s).
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