I have a 2000 Toyota Camry that has a unique problem. The Check Engine light NEVER comes on even when first starting the car. I have access to a scanner and know that the car periodically throws a catalyst code but the light never comes on. I just assumed that the bulb was burned out. Today whil…

You need to find out which pin on the connector to the engine computer is for the CEL. Then check for continuity from the lamp socket to the computer connector. Also one pin of the lamp socket goes to ground, check this continuity too. If all that checks out then it’s a problem in the computer mo…

Like others have already stated, the CEL light is usually turned on through the ECU which probably makes a ground connection inside the unit to turn on the lamp. You can check to see if there is voltage on the lamp lead going to the ECU. If there is about 12 volts on it you should be able to ground …

Well, well, well, well,…(think ‘A Clockwork Orange’), well, well, well! I have an '05 Camry that has a CEL that never shuts off. I can change the oil and a day or two later, it never fails to come right back on. A knod for consistency. I’ve had it for six years now without any other noteworthy i…

Thanks guys. the warning lights on a 2000 are right on the circuit board for the cluster and don’t have seperate sockets with leads on them. One day when i am feeling adventurous again I will pull it out again and check for continuity with my tester and check the ecu as well. The scanner i have a…

Simple code readers are not that expensive & you can pick them up at most any auto parts store. I’d just get one and leave it in the glovebox. Pop it on once in a while & have a look.

Subaru clocks have the same trouble and it is a very common problem with them. A one watt surface mount resistor becomes desoldered due to excessive heat on the joints. As far as I know, once the joints are resoldered the problem doesn’t come back. I can only assume the solder used at the factory is…

It takes more than just not having a CEL light if the inspection station plugs in a code reader. It also takes more than just having no codes. Your code reader also has ready lights which means that the circuits have been checked. You need all ready lights on to pass inspection. Clear all codes,…

The wire from the ECU to the insrument cluster may have been cut to put the light out. If you didn’t see a cut wires behind the cluster remove the glove box and check the green/red wire from cavity #6 of the top connector (E7) in the engine ECU. If you check this wire with a volt meter or test ligh…

Thanks again guys. All good points. I planning on getting my own scanner or software for my laptop cig roller, but now the problem is overcoming the urge to fix a minor thing just for the self-satisfaction of saying I could do it!!!. Keith in the 3 years I have owned the car the light has never c…

Since you have at least 3 drive cycles, you should go ahead and plug in the scanner you have access to. In the display, usually across the top, there are several two letter acronyms, like CC. These are the ready lights. You can also keep pushing the down arrow on some code readers and after displ…

Check engine light NEVER comes on

Maintenance/Repairs

keith February 17, 2012, 4:11am 20

I think Nevada could be right about a cut wire. Toyota’s are prone to a P0420 code that is very difficult to get cure, even if you replace all the components in the system. I suspect that they set the detection level a little to sensitive in the computer program. I know of a dealer that could not solve it no matter what they did.

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Check engine light NEVER comes on

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