Diagnostic Strategies

How to Troubleshoot ABS and TCS DTCs
The troubleshooting flowchart procedures assume that the cause of the problem is still present and the ABS and/or TCS indicator is still on. Following the flowchart when the ABS and, or TCS indicator does 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 customer about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting. Find out when the ABS and/or TCS indicator came on, such as during ABS control, and ABS control, when vehicle speed was at a certain speed, etc.
2. When the ABS or TCS indicator does 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, clear the DTCs, and test drive the vehicle. Make sure the ABS and TCS indicators do not come on.