What is this wire for?
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What is this wire for?
I recently was "getting to know my engine a little better" and was slowly inspecting the engine compartment for wear, problems, etc. I found a small three prong wire that was disconnected in the front of the engine block just left of the alternator. Pictures are in my signature.
Anyone know what it is?
A couple of weeks ago I had service done at the Dealership to diagnose some nasty electric problems. A few new relays, main processor, and alternator later the truck works great. They did mention they had almost all the wires unplugged at some point during their diagnostics. Drove the truck for a week before noticing this disconnected wire and truck was running fine. I have since reconnected it.
Waiting for my manual/CD-Rom to arrive so I couldn't figure out what it is yet.
Anyone know what it is?
A couple of weeks ago I had service done at the Dealership to diagnose some nasty electric problems. A few new relays, main processor, and alternator later the truck works great. They did mention they had almost all the wires unplugged at some point during their diagnostics. Drove the truck for a week before noticing this disconnected wire and truck was running fine. I have since reconnected it.
Waiting for my manual/CD-Rom to arrive so I couldn't figure out what it is yet.
Last edited by randle_ford; Jul 25, 2005 at 10:02 PM.
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Joined: Mar 2005
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From: Florida
<DT>Randle,<DT>The sensor in the picture is called a EBP:<DT> <DT>EBP: Exhaust BackPressure sensor <DD>Feedback input; PCM (power control module) uses this to monitor and control EPR operation; 5.0 volts in, 0.8-1.0 volts/14.7 psi KOEO or at idle, increases with engine RPM/load, decreases as altitude increases. PID: EBP (pressure), EBP V (volts)</DD><DD> </DD><DT>EPR: Exhaust backPressure Regulator, also EBP regulator <DD>Output; For quicker engine warm-up at cold temperatures. If the IAT (input air temp) is below 37°F (50°F some models) and the EOT (engine oil temp) is below 140°F (168° some models) the PCM sends a duty cycle signal to a solenoid which controls oil flow from the turbo pedestal. This causes a servo to close a valve at the turbo exhaust outlet. The PCM monitors the EBP input to determine if the EPR needs to be disabled to provide power for increased load, then reapplys the EPR as load demand decreases until EOT or IAT rises. PID: EPR (duty cycle), EBP (pressure)</DD><DD> </DD>Hope this helps.
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Joined: May 2001
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From: Cabot, Arkansas
The EBP sensor usually won't trigger the light, but undoubtedly has stored a code. If you don't have a scantool you can unhook the batteries for an hour or so to clear it.
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Junior User
Joined: Mar 2005
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From: Florida
Thanks to cookie88 
for the explanation of what would and did probably happen about the code. 
You are the man cookie....
for the explanation of what would and did probably happen about the code. You are the man cookie....
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Tuned
Joined: Jun 1999
Posts: 495
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From: Spearfish SD
randle_ford: My apologies for providing you bum info.
Based on the diagram on the Service CD (it is a rather poor diagram) I'd have bet 10 bucks that the arrow was pointing to the coolant temp sender.
Based on the diagram on the Service CD (it is a rather poor diagram) I'd have bet 10 bucks that the arrow was pointing to the coolant temp sender.