What are these engine bay components - JeepForum.com
 
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post #1 of 11 Old 06-03-2019, 10:26 AM Thread Starter
03rubiconMG
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What are these engine bay components

It’s been a few years since I showed my rubicon some love. Currently replacing the fenders and cleaning up some rust spots and getting her running strong again.

These two components, one black box that I am wondering what it is for and if I even need it still. Also is this sensor that looks like it is supposed to clip into a hole nicely. They are both located or were located near the battery area. Don’t remember their original locations as I have had tube fenders since 08.

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post #2 of 11 Old 06-03-2019, 11:08 AM
vosevichs
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Battery temp sensor and vacuum canistor

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post #3 of 11 Old 06-03-2019, 11:10 AM Thread Starter
03rubiconMG
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Is this vacuum canister part of the fuel system?

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post #4 of 11 Old 06-03-2019, 12:00 PM
mukluk
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The box is your vacuum reservoir. Without it your HVAC will only ever blow out the defrost vent and your cruise control won't work if the Jeep is so equipped.

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post #5 of 11 Old 06-04-2019, 04:13 AM Thread Starter
03rubiconMG
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Is the battery temp sensor really necessary?

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post #6 of 11 Old 06-04-2019, 04:32 AM
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Quote:
Originally Posted by 03rubiconMG View Post
Is the battery temp sensor really necessary?
Yes, without it your jeep will throw a CEL.
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post #7 of 11 Old 06-04-2019, 07:35 AM Thread Starter
03rubiconMG
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I guess i am more referring to if it is actually important to monitor battery temperatures. What am i risking by just zip tying this component out of the way?

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post #8 of 11 Old 06-04-2019, 06:48 PM
biffgnar
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Doesn't PCM vary flow from alternator to battery based on the sensor input?
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post #9 of 11 Old 06-04-2019, 07:06 PM Thread Starter
03rubiconMG
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I would imagine if it worked like that and may it would be a voltage sensor In the electrical system and not adjusting power based on battery temperature.

Only thing I would guess the battery temp sensor would be for is if it was being heavily used by the winch or some other large electrical item. I don’t plan on running a welder or power tools off the Jeep anytime soon and winching is usually done with after a minute or two under real load.

I’m probably going to just drill the 1” of so hole in the new batter mounting plate and put it in but now I want to know why it even has it.

Are 2019 batteries better than 2002 batteries?

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post #10 of 11 Old 06-04-2019, 07:26 PM
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From the FSM:
"The BTS is used to determine the battery temperature and control battery charging rate. This temperature data, along with data from monitored line voltage, is used by the PCM to vary the battery charging rate. System voltage will be higher at colder temperatures and is gradually reduced at warmer temperatures. The PCM sends 5 volts to the sensor and is grounded through the sensor return line. As temperature increases, resistance in the sensor decreases and the detection voltage at the PCM increases. The BTS is also used for OBD II diagnostics. Certain faults and OBD II monitors are either enabled or disabled, depending upon BTS input (for example, disable purge and enable Leak Detection Pump (LDP) and O2 sensor heater tests). Most OBD II monitors are disabled below 20 degrees F."

Oh, and keep in mind the BTS shares the same K4 sensor ground circuit as pretty much every single other sensor on the Jeep, so if you screw up the BTS sensor wiring, you can cause yourself a real headache.

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post #11 of 11 Old 06-05-2019, 03:38 AM Thread Starter
03rubiconMG
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Mukluk again thanks for the info. Thats what it’s for. Haha

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