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This communication code (C1203) will be set any time the check engine light comes on. The data link between the two computers becomes interrupted when there is a malfunction in the engine control computer or if the brake warning light is illuminated. The code itself is nothing to be worried about unless it won't clear and this is causing the lights for the VSC system to remain on. If this is the case then there is a problem in the communication line between the VSC computer and the engine control computer. This is extremely unlikely though. Remove the negative battery cable to erase all the memories in the on board systems then see if everything functions normally and this 1203 code disappears
www.automotiveforums.com > ... > Toyota > SequoiaTraction Control System Problems Sequoia Car Forums. ... The VSC/ATRAC indicator lights are staying on and the system will inadvertantly ..... giving a bad reading following the replacement of the steering angle sensor with a new one.
most likely you have a)leak in the system or b) air in the system,if a leak check the inside wheels for wet and the break master sylinder,if air then just bleed the system throu
Hello. Many times the check engine light and VSC and trac are all on due to one or more bad sensors as opposed to any serious trouble. Begin by having your car's computer scanned. AAMCO transmission shops now offer a free scan as do some auto parts stores. Begin with that. Joe
please rate my answer as very helpful thanks.
The computer turns your traction control off when it sets the check engine light. Thats why VSC lights come on at the same time. Have the local parts store see what code you are getting to find the problem.
That model Sequoia should have four oxygen sensors. There will be two in each exhaust line. One will be in front of the catalytic converter, and one will be behind it.
B1 should mean bank one. This is the driver side. S1 is probably the oxygen sensor located before the catalytic converter; however, I am not certain of the number sequence here.
The sensors screw into the exhaust pipe. They will have wires coming out the top.
It is not hard to change the sensor, it just screws into a threaded hole. The light will not go out immeditaly, after the sensor is replaced. It needs to go thru a drive cycle. Your best bet is to replace the sensor and get the code cleard by whoever scanned it for the 0031 code.
You have to know what code is stored to fix the problem. Toyota's will generally display a Check Engine light, VSC and TRAC light all at the same time, even if it's a simple problem with an oxygen sensor (for example). You can disconnect the negative battery cable for a few minutes, even though you should a scan tool should be used, to clear out the code.
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