Troubleshooting for Communication Error with Scan Tool Using CAN: Troubleshooting

WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC INFORMATION AND PROCEDURES REFERENCE CHART

Step	Action	YES	NO
1	Scan tool check Disconnect scan tool from DLC with ignition switch turned OFF. Check for proper connection to all terminals of scan tool connector. If OK, connect scan tool to another vehicle of this type with ignition switch turned OFF. Check communication between scan tool and BCM by checking BCM for DTC. Is it possible to check BCM for DTC?	Go to Step 2.	Scan tool faulty. Refer to its operator's manual.
2	DLC power circuit check Check for proper connection to all DLC (1) terminals with ignition switch turned OFF. If OK, measure voltage between +B 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 Ignition switch turn to OFF position. 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).
4	DTC Check Turn ignition switch to OFF position. Connect scan tool to DLC. Check DTC in the following control modules that communicate with scan tool by K-line. ABS/ESP® control module Keyless start control module 4WD control module Is there any DTC other than CAN-DTC?	Go to applicable troubleshooting of DTC other than CAN-DTC.	Go to Step 5.
5	CAN line check between DLC and BCM Refer to Troubleshooting for CAN-DTC Turn ignition switch to OFF position. Disconnect BCM connector from BCM. Check for proper connection to all terminals of BCM connector. If OK, check CAN lines between DLC and BCM connector for open, short to power circuit, short to ground circuit, short to other CAN line and high resistance. Are CAN lines between DLC and BCM connector in good condition?	Check CAN line. See Troubleshooting for CAN-DTC .	Repair CAN line.