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|27th May 2008, 10:57||#1|
Join Date: May 2007
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How intelligent is the 'engine check' light?
This may seem like a layman's query , but I had always wondered about the role of engine check indicator. I have never seen it light up after the engine coming to life! My query is, under what circumstances is the indicator supposed to remain lit?
|27th May 2008, 11:09||#2|
Join Date: Mar 2004
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|27th May 2008, 11:10||#3|
Senior - BHPian
Join Date: Feb 2004
Location: Hubli - Karnata
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I think the engine check light will only come on, if theres a prob with any of the engine functions that are assisted by the ECU.
I've had the check light come on my OHC vtec due to an "oxygen sensor" failure.
But i've heard that even if the speedo/tacho cable snaps, it should technically show the check light since both are connected to the ECU.
|28th May 2008, 23:50||#6|
Senior - BHPian
Join Date: Jul 2006
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In old baleno ECM check engine light can come on when ignition switch is on and engine running if fault is detected with -
engine coolant temperture sensor
throttle position sensor
intake air temperature
manifold absolute pressure esensor
camshaft position sensor
ignition fail safe signal
vehicle speed sensor
cpu of ecm .
new cars will be having lot more.
|29th May 2008, 00:13||#7|
Join Date: Aug 2004
Thanked: 13 Times
Whenever the ECM senses a malfunction (through its various sensors and equipment) that it cannot set right, the check engine light will activate. An error code will almost always be stored for future diagnosis.
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