Scan Tool Testing and Procedures

Troubleshooting for Communication Error with Scan Tool Using CAN

Perform this troubleshooting when it is not possible to communicate between scan tool and ECM/TCM.

NOTE:
^ When performing this troubleshooting, be sure to have full understanding of Precaution of Troubleshooting for CAN and observe it.
^ It may be possible that CAN system has trouble because of fuse blown or low battery voltage. Before troubleshooting, check to make sure that fuse, battery voltage and generator status are normal.
^ When disconnecting each control module connector in this troubleshooting, various DTCs will be detected. Be sure to clear DTCs in the following control modules after completing this troubleshooting.
^ ECM
^ BCM
^ TCM
^ Keyless start control module
^ 4WD control module
^ ESP(R) control module
^ HVAC control module (Auto A/C model)
^ P/S control module (Electric type)

Wiring Diagram

Wiring Diagram:

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/ESP(R) control module
^ BCM
^ Combination meter
^ Keyless start control module
^ 4WD control module
^ ID controller (Canada model)

^ Sensor communicated by CAN
^ Steering angle sensor (ESP(R) model)
^ Yaw rate/G sensor assembly (ESP(R) model)

^ Power or ground circuit of control module communicated by CAN
^ Power or ground circuit of sensor communicated by CAN

Troubleshooting

Step 1:

Step 2-4:

Step 4(Continued)-6:

Step 7-9:

Step 9(Continued)-10: