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Ask Peter Bagley Your Own Question
Peter Bagley
Peter Bagley, Auto Service Technician
Category: Toyota
Satisfied Customers: 652
Experience:  master tech at Toyota dealer
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Why does the check engine flash while driving only, and it

Customer Question

why does the check engine flash while driving only, and it flash the speed according how fast I'm driving, I already had it scanned and there is no code
Submitted: 10 months ago.
Category: Toyota
Expert:  david craig replied 10 months ago.

Hi Im David, the check engine light is flashing because the computer is detecting a misfire or misfires from the engine.

Customer: replied 10 months ago.
I don't think its that because I already had that checked, its linked to the abs, it only flashes when I drive or back up, its bin scanned twice and there is no code, if I unplug the rear abs cables its stops blinking
Customer: replied 10 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  david craig replied 10 months ago.

the site sets the price....that not me doing it

Customer: replied 10 months ago.
ok
Expert:  david craig replied 10 months ago.

if the check engine light is flashing due to abs sensors, then is the abs light on?

Customer: replied 10 months ago.
no
Expert:  david craig replied 10 months ago.

that makes no sense, if the abs cables are disconnected, the abs light should be on...

Customer: replied 10 months ago.
to me it looks like the blinking speed would match the drive shaft RPM
Customer: replied 10 months ago.
when the cables are unplugged then the ABS light comes
Expert:  david craig replied 10 months ago.

and that kind of makes sense because the abs sensor is actually attached to the rear axle. reading the speed of the reluctor inside of the axle

Expert:  david craig replied 10 months ago.

but i need to look something up,,,thats strange that the cel is flashing light that..............

Expert:  david craig replied 10 months ago.

did you have the abs system scanned for codes? i know you said the engine was scanned but was the abs system?

Customer: replied 10 months ago.
at first it did have a code but was erased and there is no code any more
Expert:  david craig replied 10 months ago.

do you remember the code?

Customer: replied 10 months ago.
when the Mechanic erased the code the light did go of for a couple of days and it came back on but it now there is no code and the engine light is flashing when driving
Expert:  david craig replied 10 months ago.

does the mechanic remember the code??

Customer: replied 10 months ago.
are you still with me?
Expert:  david craig replied 10 months ago.

yeppers

Expert:  david craig replied 10 months ago.

unless i know the code the he erased i will have to opt out and let another tech jump in because Ive never seen this scenario

Customer: replied 10 months ago.
the code mentioned low voltage
Customer: replied 10 months ago.
that's all I could tell you about it
Expert:  david craig replied 10 months ago.

ok, i will opt out then...good luck

Expert:  Peter Bagley replied 10 months ago.

Hello and welcome to just answer and allowing me to assist you. Could you just disconnect one sensor at time? this may narrow down the area at fault. Did that cod mention a speed sensor?That would defiantly help.Get back to me after you do that with your findings.

Customer: replied 10 months ago.
The just mentioned something about the volts being low
Expert:  Peter Bagley replied 10 months ago.

OK but can you do what i asked that might tel us which side is acting up. then we can trace the problem, it just might very well be the wheel sensor.

Expert:  Peter Bagley replied 10 months ago.

It would make it simpler to have it on shop scanner to show the wave pattern of each sensor, that would show exactly where the problem is.

Expert:  Peter Bagley replied 10 months ago.

Te voltage to the wheel sensor should be 1.5-5 v anything else would indicate wringing problem.

Expert:  Peter Bagley replied 10 months ago.

please rate this so we can move on, thank you