Its snowing here in northern ohio and would like to know the enabling conditions that turn on the ebpv. I've searched but every thread is about the strange noise it creates or how to disable it. I know the solenoid works cause I jumped the connector and it closes, it also didnt leak oil too. I read somewhere about the conditions needed: air temp, oil temp, parking brake. Anyone know the exact conditions needed?

 

Some info here...:

Exhaust Back Pressure Regulator
Exhaust back pressure is controlled to provide more heat to the coolant for cab heating when ambient air temperature is below 5°C (40° F) and engine oil temperature is between -10° C (15°F) and 83°C (182°F) during low load. At high load, high speed conditions, the back pressure system is disabled.

The exhaust back pressure regulator solenoid and exhaust back pressure piston are contained in the turbocharger mounting pedestal. Turbocharger pressurized lube oil is routed to the exhaust back pressure solenoid. Oil regulated by the exhaust back pressure solenoid actuates the piston which operates the back pressure valve in the exhaust housing.



[img]file:///C:/TSO/tsocache/OFFICE_1740/VXC~us~en~file=AA0835A.gif~gen~ref.gif[/img]

 

thats it? Theres no check engine light and i get a high idle of 900rpms. Its down into the 20's here

 

I found my PSD PDF. There are 3 sensors that run the EBPV.
EOT:Below 122*F, idle raises to 900rpms max, fault code set when defective.
IAT:Used to enable EBPV, fault code set when defective and PCM assumes 59*F
EBP:Open or short in wiring results in low out of range voltage at PCM.

Since i get an rpm increase to 900, the EOT is good. It could be the IAT but i dont have the check engine light, but it still could be reading high. The EBP could be bad since it doesnt say a fault code will be set.

Anyone have a temp/voltage chart for the IAT and EBP sensors at around 30*F-40*F?

 

I ohmed out the EBPV solenoid and got 10.4. Also, I hooked up a voltmeter to the PCM side of the connector and got varying voltages of 3-8v. When i tried to jump the solenoid like i did in the summer, i didnt hear it click like before (engine off).

 

I think the solenoid was stuck, i hit it with a hammer and it works when i manually jump it. I'll report back if it works automatically.
Can the solenoid be replaced w/o taking the turbo off, I see there is a bracket that holds it down, is that it?

 

<TABLE><TBODY><TR><TD vAlign=top width="100%">Exhaust Back Pressure Regulator



Exhaust back pressure regulator is a variable position valve that controls exhaust back pressure during cold ambient temperatures to increase cab heat and decrease the amount of time needed to defrost the windshield. The PCM uses the measured exhaust back pressure, (ambient) intake air temperature, engine oil temperature and engine load to determine the desired exhaust back pressure. Valve position is controlled by switching the output signal circuit to 12 volts inside the PCM. On/off time is modulated from 0 to 99% dependent upon the exhaust back pressure desired. Upon each initial engine start-up, the PCM exercises the exhaust back pressure valve by commanding it to cycle on and off once. If upon start-up the temperature of intake air sensed by the IAT sensor is < 37°F (5°C) and the oil temperature sensed by the EOT sensor is between 32°-140°F (0-60°C) it will continue to keep the back pressure valve partially closed. As the oil temperature rises during engine operation, the PCM will control the valve in response to the rising oil temperature.

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