|LANCE’S CORNER – AUTO REPAIR HELP|
AUTOMOTIVE WARNING LIGHTS
Charging systems commonly use a warning light that uses a system called the balanced circuit. The warning light receive battery voltage on the input side of the light, while the ground side is connected to the alternator output circuit. When the key is on, and the engine is off, current will flow through the light and ground inside the alternator. When the engine is running, current will flow out of the alternator output circuit and will stop current flowing through the warning light by equalizing voltages on either side of the bulb.
Warning lights are used by vehicle control modules to inform operators of system failure or malfunction. One example is the Service Engine Soon light. This light is operated by the control module using a driver inside the control module. If the control module has a system failure or a system operating outside of its control parameters, it will illuminate the Service Engine Soon light. Other automotive systems will use a similar system to operate their respective lights. The anti-lock brake module may use the brake warning light and an anti-lock light to warn operators.
(Lance owned his own auto repair shop for 30 years before retiring in 2006.)
I have a Toyota Sienna 2002 van. While driving, the brake, Abs and Tpm signs light on simultaneously and go away by themselves. Got a computer to diagnose the problem and the message is:
CO 205 Left front wheel speed sensor signal malfunctioning
CO 210 Right rear wheel speed input signal missing
Changed all the four tires as they were old, the rt.rear hub, cleaned the ABS contact points with WD 40 as remedy but the problem still persists.
I need to replace the oil level sensor on a 2004 Audi S4. Is it a simple task? Is it bolted to the bottom of the oil pan? Will all the oil run out when I unbolt the old one?…or is this a dry-sump engine, and I will only lose a small amount.
I have a 2014 Honda CRV that several warnings lights came on on the dash. Took it to OReillys to have computer tested and it showed the camshaft position sensor was faulty. Will all the warning lights come on for that sensor being faulty? The ABS light is even on.