I´m planning to do the DIY exhaust brake, tomorrow.
After reading a lot of the articles related, I have some questions:
1.- How I know if my EBPV is working righ now, before to do the DIY?
2.- How do you know when the T.C. locks in normal driving?
3.- The pin #4 in the tranny connector is the TC lock up? and is the same that the pin #6 in the grey connector underneath the brake master cylinder?
4.- the catode of the silicone diode (end silver band) has to be toward the tranny to the TC lock up?

Thanks for any advice.
Jose

 

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When the engine is cold, have someone turn on the ignition without starting it. You shoud see the EBPV move from open to closed. It's a bit hidden, the pict should help.

The TC locks at ~35-40 MPH, it's subtle but doesn't feel like a tranny shift. Count the # of gear changes steadily accelerate from stopped to 50 MPH, you should see 4 tach reductions in RPM.

Not sure about the pinout or diode, but there are posts on the site with picts that show those particulars.

 

Thanks like always Cuda_jim
.......Count the # of gear changes steadily accelerate from stopped to 50 MPH, you should see 4 tach reductions in RPM....... If I understand well, the TC locks every time when the tach makes the reductions in RPM? or only at the last gear change at about 35-40 MPH?.

 

The TC locks once. It's controlled by the PCM and unlocks when you touch the brakes or accelerate hard and of course before you come to a stop. The other tach reductions are the gear changes.

1st to 2nd gear change
TC locks until PCM says otherwise
2nd to 3rd gear change
3rd to OD gear change

 

I made what you told me when the engine was cold, someone turned on the ignition without starting it and I didn´t see the EBPV move from open to closed. I disconected the plug and with a tester there is no voltage with the ignition key on; second I put 12V direct to the EPBV with the connector in place and I only heard a little noise but no movement of the valve. Is there any fuse to controls the voltaje to the EBPV? or the EBPV is wrong? (it is a solenoid in the turbo pedestal?) If it is wrong I have to take off the turbo?

Manually the valve has movement, so it is not blocked.

Any ideas?

thanks.
Jose

p.s. I understood about the TC locks

 

Use THIS LINK to identify the various engine sensors.

I just remebered you live in Mexico, it's probably hot down there, right? So, The ambient air temp sensor won't signal the ebpv to close with the key on.

This is from the repair manual:
The exhaust back pressure (EBP) sensor is a variable capacitance sensor that, when supplied with a 5 volt reference signal from the powertrain control module (PCM), produces a linear analog voltage signal that indicates exhaust back pressure. The powertrain control module uses this signal to control the exhaust back pressure device when needed



The exhaust back pressure regulator (EPR) is a variable-position valve that controls exhaust back pressure during cold ambient temperatures to decrease the amount of time required to warm up the engine. The powertrain control module (PCM) uses the measured exhaust back pressure, ambient air temperature and engine oil temperature to determine the desired exhaust back pressure.

 

another thing, the temperature intake sensor is free, since I changed the intake, and the temperature here is about 20 Celcius (aprox. 68F). Maybe is it the reason that the butterfly doesnt close??

I´ll aprecciate any help.

sorry for my spell.

 

This is how the Exhaust Back Pressure System works: The air temp has to be below 45 F
The exhaust back pressure system causes rapid engine warm-up to provide warm coolant for the heater and defroster system.

EPR
The exhaust back pressure regulator (EPR) output from the PCM controls the EPR when the engine is running and engine oil temperature is below 75° C (167°F) and ambient air temperature is below 7°C (45°F). The EPR operates a butterfly valve which controls exhaust back pressure. The back pressure will be controlled during low-load, low-speed conditions. At high-load, high-speed conditions, the back pressure system is disabled. The valve is cycled on/off for every start-up to help prevent sticking of the butterfly valve.

EBP Sensor
The exhaust back pressure (EBP) sensor measures the pressure in the exhaust system downstream of the turbo outlet and upstream of the exhaust back pressure butterfly valve. This sensor is used in conjunction with the EPR to form a closed loop exhaust back pressure control system. The exhaust back pressure is controlled to make the engine run hotter and thus provide more heat to the coolant for cab heating in cold climates during cold engine operation. Additionally, the EBP sensor is used to diagnose excessive back pressure, for restricted exhaust system concerns.

Engine oil pressure is used to control the butterfly valve position via the closed loop control.

 

Cuda_jim, thanks for all your great explanation, as I say, dayly I learn something new here.

Im going to put a new thread to ask specifically who has installed a DIY exhaust brake in a automatic truck?, because I have some doubts about the connection to the Torque Converter Lock up and I dont want to make a mess o screw something.

Thanks againg and my best regards.

Jose