Engine code scanner - check engine light not on
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Engine code scanner - check engine light not on
This is kind of a random question me and my friend were discussing. We were wondering if something were awry with the engine but the check engine light wasn't on if a scanner would still let you know. He is getting a feeling something is wrong with his truck but his check engine light hasn't illuminated.
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Joined: Jan 2004
Posts: 13,851
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From: SW Va
Well the answer is maybe!!!!
"Pending" codes can be stored & the CEL not be lit.
Other things can be wrong, but if the computer isn't monitoring them, a CEL won't be lit, nor a pending code stored, Unless the problem adversley affects something that IS being monitored by the computer.
SO, if he has a "scantool", that'll monitor live PID feeds to the computer, he might be able to get an idea of whats going on by reviewing the PID's the scantool can monitor, to see if any parameters look abnormal.
"Pending" codes can be stored & the CEL not be lit.
Other things can be wrong, but if the computer isn't monitoring them, a CEL won't be lit, nor a pending code stored, Unless the problem adversley affects something that IS being monitored by the computer.
SO, if he has a "scantool", that'll monitor live PID feeds to the computer, he might be able to get an idea of whats going on by reviewing the PID's the scantool can monitor, to see if any parameters look abnormal.
Fleet Mechanic
Joined: Feb 2007
Posts: 1,716
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From: Boston, MA
Well the answer is maybe!!!!
"Pending" codes can be stored & the CEL not be lit.
Other things can be wrong, but if the computer isn't monitoring them, a CEL won't be lit, nor a pending code stored, Unless the problem adversley affects something that IS being monitored by the computer.
SO, if he has a "scantool", that'll monitor live PID feeds to the computer, he might be able to get an idea of whats going on by reviewing the PID's the scantool can monitor, to see if any parameters look abnormal.
"Pending" codes can be stored & the CEL not be lit.
Other things can be wrong, but if the computer isn't monitoring them, a CEL won't be lit, nor a pending code stored, Unless the problem adversley affects something that IS being monitored by the computer.
SO, if he has a "scantool", that'll monitor live PID feeds to the computer, he might be able to get an idea of whats going on by reviewing the PID's the scantool can monitor, to see if any parameters look abnormal.
Also if something with your Truck is "wrong" the first thing you should do is bring all the maintenance up to Par.....a lot of times that solves the issue...
Senior User
Joined: Jul 2007
Posts: 443
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From: Brandon, MS
Well the answer is maybe!!!!
"Pending" codes can be stored & the CEL not be lit.
Other things can be wrong, but if the computer isn't monitoring them, a CEL won't be lit, nor a pending code stored, Unless the problem adversley affects something that IS being monitored by the computer.
SO, if he has a "scantool", that'll monitor live PID feeds to the computer, he might be able to get an idea of whats going on by reviewing the PID's the scantool can monitor, to see if any parameters look abnormal.
"Pending" codes can be stored & the CEL not be lit.
Other things can be wrong, but if the computer isn't monitoring them, a CEL won't be lit, nor a pending code stored, Unless the problem adversley affects something that IS being monitored by the computer.
SO, if he has a "scantool", that'll monitor live PID feeds to the computer, he might be able to get an idea of whats going on by reviewing the PID's the scantool can monitor, to see if any parameters look abnormal.
Originally Posted by powersmoked
Also if something with your Truck is "wrong" the first thing you should do is bring all the maintenance up to Par.....a lot of times that solves the issue...
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