My 01 Sequoia 4x4 SR5 has a c1203 fault (ECM COMM Circuit Malfunction). Is there something that should be checked? It came on when the mechanic was checking why the brake light was on. That is now fixed, but the ABS and two VSC lights are on.I would like a solution that does not require me to spend a huge amt of money on a new computer.
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Was the check engine light on it one time?
Yes. I brought it in because the check engine light was on
PO440 Evap Sys FaultPO441 EVAP SYS Incorrect Purge FlowPO446 EVAP SYS Vent Control FaultI was given a new gas cap which is now installed. Both the engine light and brake lights are off now.
I removed the negative battery cable for 10 seconds and then reconnected it and started the car. The ABS light and the two VSC lights are still lit.
I do not have a code reader myself. The piece of paper the mechanic gave said:
SEQUOIA 01 4.7L ABS W TRACKC1203 ECM COMM CIRCUIT MALFUNCTION
I drove it home and it runs fine. Its the first time in months that the engine light and brake light are off for which I am thankful. But am not so happy that the ABS light is on (it wasn't before) and the two VSC light remain lit.
> If this problem just occurred after it was recently worked on it sounds like there's possibly an engine control malfunction code setting in the pending portion of the engine control computer which will in turn cause the VSC system to come on.1. So if there are pending codes, can these be somehow cleared and the lights should go quiet? 2. If there is no other problem with the VSC system and the ABS light is cleared in 1. will the VSC lights go out as well?
If the code is not an ongoing or current problem malfunction in the engine control computer then yes normally removing the negative battery cable will wipe the memory clean and should cause all of the lights to go out. However if you're dealing with a malfunction that is current or ongoing the first time you turn the key on and the malfunction is detected it sets in the pending portion of the engine control computer. Theoretically the vehicle skid control light should not come on until it is transferred to the current code system. The VSC light always comes on when there is a loss of communication or anything going on in the engine control computer so that the engine control computer can use the VSC system appropriately for safety reasons. Regarding your number two question answer would be yes. If there is a fault in the ABS system it will also cause a communications code 1203 to set in the vehicle skid control computer. 1203 is lodged in the vehicle skid control computer. From 2001 through 2003 the Sequoia had tons of problems with the vehicle skid control and ABS systems. This was everything from bad computers to bad ground wires and the list goes on and on.
Anything I should tell the mechanic tomorrow when I bring it back? Maybe clean the throttle control sensor or something like that (read that that fixed the problem on another forum)?Since it came on as he was poking around trying to quiet the brake/engine lights maybe he dislodged something or whatever. Any ideas on what he might try?
As it turns out the Front Right ABS sensor needed replacing (it was broken while the mechanic was investigating the brake light problem).Now all the lights are quiet now. The only odd thing is that the Skid~ light comes on when ever I start from a stand still. The power cuts out and then a second later comes roaring back. It is a bit irritating.