When using the IDSS diagnostic scan tool, it is possible to encounter communication errors. In some cases, the scan tool may fail to establish communication with the CAN device, specifically in models with radar sensors and stereo cameras. This article will provide a step-by-step guide on troubleshooting and solving the communication issue.
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Diagnostic Steps:
Step 1: Engine Control System Check
Start by referring to the “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) Diagnostic system check-engine controls” to perform an engine control system check.
Step 2: Scan Tool Communication Verification
1. Connect the scan tool and turn on the ignition switch.
2. Check the vehicle specifications and verify the status of communication with various control modules using the scan tool.
3. If communication can be established with any of the control modules, proceed to ECM communication verification.
4. If no communication is established, proceed to DLC inspection.
Step 3: ECM Communication Verification
1. Check the communication status with the ECM using the scan tool.
2. If communication with the ECM is established, proceed to Battery sensor communication verification.
3. If communication with the ECM is not established, refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) lost communication with the ECM (models with radar sensor/stereo camera)”.
Step 4: Battery Sensor Communication Verification
1. Check the communication status with the battery sensor using the scan tool.
2. If communication with the battery sensor is established, proceed to TCCM communication verification.
3. If communication with the battery sensor is not established, refer to “51.Engine Control 1A.Troubleshooting(IBS (4JJ3 with DPD)) lost communication with the battery sensor (models with radar sensor/stereo camera)”.
Step 5: TCCM Communication Verification
1. Check the communication status with the TCCM using the scan tool.
2. If communication with the TCCM is established, proceed to Rear differential lock control unit communication verification.
3. If communication with the TCCM is not established, refer to “53.Driveline Control 3A.Troubleshooting(4WD models (Type1)) lost communication with the TCCM (models with radar sensor/stereo camera)”.
Step 6: Rear Differential Lock Control Unit Communication Verification
1. Verify that communication can be established with the rear differential lock control unit using the scan tool.
2. If communication with the rear differential lock control unit is established, proceed to TCM communication verification.
3. If communication with the rear differential lock control unit is not established, refer to “53.Driveline Control 3A.Troubleshooting(Differential Lock (Type1)) lost communication with the rear differential lock control unit (models with radar sensor/stereo camera)”.
Step 7: TCM Communication Verification
1. Check the communication status with the TCM using the scan tool.
2. If communication with the TCM is established, proceed to Information module communication verification.
3. If communication with the TCM is not established, refer to “55.Transmission Control 5A.Troubleshooting(AWR6B45) lost communication with the TCM (models with radar sensor/stereo camera)”.
Step 8: Information Module Communication Verification
1. Verify that communication can be established with the information module using the scan tool.
2. If communication with the information module is established, proceed to Central gateway control unit communication verification.
3. If communication with the information module is not established, refer to “64.Body Control 10I.Troubleshooting(Information Module) lost communication with the information module (models with radar sensor/stereo camera)”.
Step 9: Central Gateway Control Unit Communication Verification
1. Verify that communication can be established with the central gateway control unit using the scan tool.
2. If communication with the central gateway control unit is established, proceed to Inspection for open circuit and short circuit in the CAN circuit.
3. If communication with the central gateway control unit is not established, refer to “64.Body Control 10I.Troubleshooting(Central GateWay) lost communication with the central gateway control unit”.
Step 10: Inspection for Open Circuit and Short Circuit in CAN Circuit
1. Inspect for intermittent short circuits between the CAN Low and CAN High circuits, as well as intermittent shorts to ground or power supply circuits.
2. Inspect for intermittent open circuits in the CAN Low and CAN High circuits in the control unit with which communication cannot be established.
3. If all results are normal, proceed to Repair verification.
4. If any issues are found, repair the circuit as necessary and then proceed to Repair verification.
Step 11: DLC Inspection
1. Inspect for poor connections at the DLC (pins 6 and 14 of C19).
2. If the connection status is normal, proceed to Central gateway control system inspection.
3. If any issues are found, repair the connections as necessary and then proceed to Repair verification.
Step 12: Central Gateway Control System Inspection
1. Perform the central gateway control system inspection.
2. Proceed to ECM inspection.
Step 13: ECM Inspection
1. Turn off the ignition switch and disconnect the ECM harness connector (C9).
2. Turn on the ignition switch and verify communication with control units other than the ECM using the scan tool.
3. If communication with control units other than the ECM is established, proceed to ECM replacement.
4. If communication with control units other than the ECM is not established, proceed to Battery sensor inspection.
Step 14: Battery Sensor Inspection
1. Disconnect the battery sensor harness connector (C49).
2. Turn on the ignition switch and verify communication with control units other than the battery sensor using the scan tool.
3. If communication with control units other than the battery sensor is established, proceed to TCCM.
4. If communication with control units other than the battery sensor is not established, proceed to TCCM inspection.
Step 15-28: Replacement and Repair Verification
Follow the specific replacement procedures for each control unit that failed the communication verification test. After replacing the control unit, perform a repair verification to ensure communication is established with all control modules.
Conclusion:
By following the step-by-step guide provided in this article, you should be able to troubleshoot and solve the communication issue between the ISUZU IDSS diagnostic adapter and the CAN device. It is essential to perform thorough inspections and, if necessary, replace faulty control units to ensure proper communication and functionality.
For more guide about ISUZU,please refer to:ISUZU Trouble Repair.