Fault Codes P1108 and P1109

DM_MKV · May 10, 2010

Hello,

I am new here and just recently purchased a 1996 xj, after selling my 99 a few years back.

I have not been around a 4.0l in a few years and am sorta stumped on this one and trying to figure out what the cause of these codes are.

P1108 BARO to MAP Sensor Comparison Too High
P1109 Secondary Port Throttle System

I am taking a guess after searching around that it is some sort or sensor. Does any one have a direction 0on where to go with this or what causes these codes.

Engine wise there are no modification. I do have a RE 5.5 lift.. Don't think that matters just add it anyways.

Thanks

Derek

lowicz96 · May 10, 2010

Well the MAP sensor reads vacuum so check for broken lines and vacuum leaks.

idk what P1109 is

birchlakeXJ · May 10, 2010

Are there any symptoms that go along with these codes?

I can't find hardly anything on the P1109, but as the P1108 is MAP sensor related, I would start by verifying that vacuum is good to that sensor as lowicz mentions and if it is, the MAP sensor can be tested with a meter and a manual.

DM_MKV · May 10, 2010

birchlakeXJ said:
Are there any symptoms that go along with these codes?

I can't find hardly anything on the P1109, but as the P1108 is MAP sensor related, I would start by verifying that vacuum is good to that sensor as lowicz mentions and if it is, the MAP sensor can be tested with a meter and a manual.

No symptoms. Runs fine Idle is good. Just trying to pass emissions to get it registered. I will run through the vacuum lines tonight and make sure all is well if not maybe time for a new MAP.

Thanks

birchlakeXJ · May 10, 2010

Both of these codes most likely have "one" common cause. Could be that MAP. Easy to test and replace if necessary.

Saudade · May 11, 2010

That's an odd pair of codes. Did you pull them with an OBD-II scanner?

You could try resetting the codes and see what returns. If you do, you'll need to drive it around a bit to reset the readiness monitors. That could take a few days depending on your driving. You'll need to wait until they say "Ready" before you retest.

DM_MKV · May 11, 2010

Saudade said:
That's an odd pair of codes. Did you pull them with an OBD-II scanner?

You could try resetting the codes and see what returns. If you do, you'll need to drive it around a bit to reset the readiness monitors. That could take a few days depending on your driving. You'll need to wait until they say "Ready" before you retest.

I found a temp sensor that was unplugged and plugged back in and light went away just driving it around to clear the memory and will try to pass emissions after it has reset. Thanks for all the response and tips. I will update if this was the root issue.

Derek

Saudade · May 11, 2010

What sensor was it?

DM_MKV · May 11, 2010

Saudade said:
What sensor was it?

Not sure the name I can take a picture and post it later tonight or tomorrow.

Derek

Fault Codes P1108 and P1109

DM_MKV

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birchlakeXJ

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DM_MKV

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Saudade

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DM_MKV

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