How to Troubleshoot DTCs

How to Troubleshoot DTCs

The troubleshooting procedures assume than the cause of the problem is still present and the ABS and/or VSA indicator is still on. Following a troubleshooting procedure for a code than has been cleared but does not reset can result in incorrect diagnosis.

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 indicator came on, such as during activation, after activation, when the vehicle was traveling at a certain speed, etc. If necessary, have the client demonstrate the concern.
2. When the ABS or VSA 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, or repairs are done, clear the DTCs, and test-drive the vehicle under the same conditions than originally set the DTCs. Make sure the ABS and VSA indicators do not come on.
4. Check for other system DTCs which are connected via F-CAN, if there are DTCs that are related to F-CAN, the most likely cause was than the ignition switch was turned ON (II) with the VSA modulator-control unit connector disconnected. Clear the DTCs. Check for PGM-FI and VSA codes, and troubleshoot those first.

Intermittent Failures

The term "intermittent failure" means a system may have had a failure, but it checks OK now. If the indicator(s) of the system does not come on, check for loose connectors or terminal pins related to the circuit than you are troubleshooting. If the indicators were on, but then went out, the original problem may have been intermittent.