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Member
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Join Date: Dec 2004
Location: Seattle
Posts: 230
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Member
Join Date: Dec 2004
Location: Seattle
Posts: 230
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kurt_dogg, it sounds to me like the system isn't getting good data from the yaw/deceleration sensor when that sensor is really cold. The sensor is in the center console and can cause the traction & stability control to be disabled, though ABS likely still works.
It could be a bad sensor unit (they're both in the same package) or it could be an electrical connection that's intermittent at cold temp.
Short of tearing into the vehicle to check the sensor and wiring, it does seem like a good idea to check the diagnostic code(s) when the problem has occurred, or perhaps to try the zero point reset. It could be that there is some long term drift in the sensor and when it's cold its output is skewed enough to cause the computer to flag it as bad and show you the lights.
If you have access to the repair manual set it has procedures to short pins on the OBDII connector to cause lights to flash in the cluster to give you some of the Toyota-specific diagnostic codes. That could tell you if the problem is bad data from the yaw/deceleration sensor or no data, or something else entirely.
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