Code 51 ECT open
06-26-2007, 05:21 PM
#2
4th Gear Member
Join Date: Nov 2006
Location: PA
Posts: 1,234
RE: Code 51 ECT open
A bad ECT affects the air/fuel mixture, timing, idle rpm, and emissions. Have you checked the connections for corrosion or a bad wire?
"If the ECT suddenly signals an infinite resistance as in an open, the control module ignores this input, which would otherwise drive the air/fuel ratio very rich. The FMEM switches to a fixed reisitance value for the ECT, allowing the warm engine to operate as a warm engine. At the same time the control moduel turns on the 'check engine' light. Do not expect a cold engine to start properly with a fixed warm signal for a cold engine. The FMEM is programmed to remember the ECT signal just before the failure and continue at that imput value."
This is known as a Failure Mode Effects Management (FMEM).
If youre still sure you need a new ECT get a new one and see if it fixes the issues youre having.
"If the ECT suddenly signals an infinite resistance as in an open, the control module ignores this input, which would otherwise drive the air/fuel ratio very rich. The FMEM switches to a fixed reisitance value for the ECT, allowing the warm engine to operate as a warm engine. At the same time the control moduel turns on the 'check engine' light. Do not expect a cold engine to start properly with a fixed warm signal for a cold engine. The FMEM is programmed to remember the ECT signal just before the failure and continue at that imput value."
This is known as a Failure Mode Effects Management (FMEM).
If youre still sure you need a new ECT get a new one and see if it fixes the issues youre having.
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