How to Troubleshoot DTCs
How to Troubleshoot DTCsThe troubleshooting flowchart procedures assume that the cause of the problem is still present and the ABS and/or VSA indicator are still on. Following the flowchart when the ABS and/or VSA indicators do not come on can result in incorrect diagnosis. The connector illustrations show the female terminal connectors with a single outline and the male terminal connectors with a double outline.
1. Question the client about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting. Find out when the ABS and/or VSA indicators came on, such as during braking, accelerating, or turning, etc.
2. When the ABS and VSA indicators do not come on during the test-drive, but troubleshooting is done based on the DTC, check for loose connectors, poor contact of the terminals, etc. before you start troubleshooting.
3. After troubleshooting or repairs are done, clear the DTCs, and test-drive the vehicle under the same conditions that originally set the DTCs. Make sure the ABS and VSA indicators do not come on.
4. Check for DTCs from other control units which are connected via F-CAN. If there are DTCs that are related to F-CAN, the most likely cause was that the ignition switch was turned ON (II) with the VSA modulator-control unit connector disconnected. Clear the DTCs. Check for fuel and emissions, and VSA codes, first. Be sure to troubleshoot those first.
Intermittent Failures
The team "intermittent failure" means a system may have had a failure, but it checks OK now. If the indicator(s) of the system on the dash does not come on, check for poor connections or loose terminals at all connectors related to the circuit that you are troubleshooting. If the indicators were on but then went out, the original problem may have been intermittent.