a little help with these codes?
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Posting Guru
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Thread Starter
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Posting Guru
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that was the engine of key ON test
this is the engine one test
21. Engine Coolant
Temperature (ECT) sensor
signal voltage: out of range
(Key On Engine Off Self-
Test), not at normal
operating temperature
(Engine Run Self-Test) or
loss of signal (during
normal engine operation).
or,
Electronic Distributorless
Ignition System (EDIS) fault
– problems with Crankshaft
Position Sensor (CPS)
circuit.
44.
Problems in Thermactor Air
Control system.
33.
EGR Valve Position (EVP)
sensor or Pressure
Feedback EGR (PFE)
sensor indicates EGR valve
is not opening.
or,
EGR Valve Position (EVP)
sensor or Pressure
Feedback EGR (PFE)
sensor indicates EGR valve
not seated (closed) properly
74.Brake ON/OFF (BOO)
switch action not detected
during Dynamic Response
portion
of Engine Run Self-Test.
soo!! the last code was cuasing my OD botton to swith on and of when i touch the brake!! i have another post about that problem
But Can anyone tellme what are they what are they causing? these codes?
this is the engine one test
21. Engine Coolant
Temperature (ECT) sensor
signal voltage: out of range
(Key On Engine Off Self-
Test), not at normal
operating temperature
(Engine Run Self-Test) or
loss of signal (during
normal engine operation).
or,
Electronic Distributorless
Ignition System (EDIS) fault
– problems with Crankshaft
Position Sensor (CPS)
circuit.
44.
Problems in Thermactor Air
Control system.
33.
EGR Valve Position (EVP)
sensor or Pressure
Feedback EGR (PFE)
sensor indicates EGR valve
is not opening.
or,
EGR Valve Position (EVP)
sensor or Pressure
Feedback EGR (PFE)
sensor indicates EGR valve
not seated (closed) properly
74.Brake ON/OFF (BOO)
switch action not detected
during Dynamic Response
portion
of Engine Run Self-Test.
soo!! the last code was cuasing my OD botton to swith on and of when i touch the brake!! i have another post about that problem
But Can anyone tellme what are they what are they causing? these codes?
Lead Driver
Joined: Nov 2002
Posts: 9,556
Likes: 43
From: Concord, NC
I'd pay attention to the EGR code and adaptive limit code first and not really worry about the rest just yet. The 21 was likely due to the engine not being warmed up when you ran the test, and 74 is either a bad BOO switch or you didn't step on the brake pedal after you goosed the throttle.
Adaptive limit means the computer is trimming the fuel mixture based on the O2 sensor feedback and has reached the limit to how much more fuel or less fuel the engine needs, but the mixture is still wrong. It could be an O2 sensor, or it could be a vacuum leak or a fuel leak, or possibly even a misfire. These OBD-I codes are not as specific as the OBD-II codes are, so diagnosing the actual cause of the problem on these trucks is a little more complex.
Adaptive limit means the computer is trimming the fuel mixture based on the O2 sensor feedback and has reached the limit to how much more fuel or less fuel the engine needs, but the mixture is still wrong. It could be an O2 sensor, or it could be a vacuum leak or a fuel leak, or possibly even a misfire. These OBD-I codes are not as specific as the OBD-II codes are, so diagnosing the actual cause of the problem on these trucks is a little more complex.
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Posting Guru
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i think its the O2 sensor somethimes i can smell a little gas in the cabine its running richt im gouing to change it and see if this code continues
the boo switch i didnt press the brake after i goosed the trottle and yeah the 21 code becuase i didnt let it go to operating temp before doing the test soo code
33 and code 85 and 86 those are the codes. i dont understand about code 85 and 86 any tips?
the boo switch i didnt press the brake after i goosed the trottle and yeah the 21 code becuase i didnt let it go to operating temp before doing the test soo code
33 and code 85 and 86 those are the codes. i dont understand about code 85 and 86 any tips?
