Lexus Troubleshooting Questions? Ask a Lexus Expert
Do you have a code reader to check for codes that would be set in the ABS computer of the VSC computer or the traction control computer?
OK let me do some looking into this. Do you have the VIN available? Who told you to replace the VSC Computer? Has this been to the dealer?
Ok give me some time and I will get back to you with some ideas.
The codes that you getting are the same as before the computer was replaced? Was this computer a new Lexus computer or used?
OK did you install or did your lexus expert? Do you have the part number of the Computer and are you looking for specific repair guide lines or general information?
Ok Standby. Little busy in the shop and I need to do some research on this. Thanks for the extra info.
Okay here's what's going on. First of all description of the codes. The C1203 code means there's a communication error or failure between the engine control computer and the ABS computer a lot of times this code was set by default whenever there is an engine code set in the engine control computer. However it will also set if the linear offset solenoid has not been initialized or calibrated. Given your situation you also have a C1345 code which specifically says that the calibration of the linear solenoid has not been done. Those two code should clear up once the solenoid has been initialized or calibrated that has to be done whenever the vehicle skid control computer is replaced. However my more pressing concern is all of the communication codes that you have. The U0126 means there's no communication with the steering angle sensor the U0129 means there's no communication with the skid control ECU and the u0293 means there's no communication between the HV ECU and the skid control computer. The U0073 means the control module Bus off signal is not present. That could be set by default due to the other communication error codes. The first thing to do is initialize or calibrate the linear offset solenoid. Click this link and download that procedure using the jumper wire method if you do not have a Techview scan tool. Make sure you save a copy the link will time out. Once you perform the initialization procedure remove the negative battery cable and positive battery cable place a jumper wire between the two cable ends isolated from the battery to do a hard reset and memory clear. Then reattach the battery cables drive the vehicle and see if the same codes come back. As a backup or checked to make sure that the offset solenoid calibration occurred I would reperform the calibration procedure after you reattach the battery cable ends. Back to the communication function codes. You need to check the high-speed can network and make sure it has 62 ohms at the DLC three connector. Then you need to isolate the vehicle skid control computer and make sure it has the proper resistance on the network. Check for power and ground to the skid control computer if you confirm that the high-speed can network is working and checks okay and the HV ECU and skid control ECU are both on the network and communicating then the initialization/calibration should solve the problem it's just that I've never seen this many communication error codes caused by just one initialization calibration problem. Hopefully that takes care of it and you're not getting into a high-speed can network diagnostic problem. Your Lexus expert should how to check the high-speed can network to the skid control.