Sporadic SES light and exotic codes - friend's 2004 DTS - Page 3
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Sporadic SES light and exotic codes - friend's 2004 DTS in Past Cadillac Vehicle Discussion; Originally Posted by Submariner409 bump......... Message received :-) We have acquired OE parts from ACDelco: - 2 of ACDelco 18A911A ...
  1. #31
    c_d
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    Re: P0174 on a 04 Deville

    Quote Originally Posted by Submariner409 View Post
    bump.........
    Message received :-)

    We have acquired OE parts from ACDelco:

    - 2 of ACDelco 18A911A Advantage Rear Brake Rotor and ACDelco 14D792CH Advantage Rear Ceramic Disc Brake Pad Set.

    We will (attempt to) install the new rear brakes tonight.

  2. #32
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    Re: P0174 on a 04 Deville

    Remember - the rear caliper pistons do NOT compress back into the caliper - they must be screwed back in and the piston face indents aligned with the pad backing plate indents. It's part of the parking brake ratchet adjustment mechanism.

    You will need the proper torque values for the rear brake parts bolts. Brake pin lube.

    www.alldatadiy.com - Chilton and Haynes manuals are far too generic.

  3. #33
    c_d
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    Re: P0174 on a 04 Deville

    Yes, I think I have done my research and found a tool called "brake cube" at Harbor Freight for $4. I have also updated my torque wrenches to providing much higher setting for the 100 ft/lbs for properly attaching the wheels. One concerns remains though: he had a leaking master cylinder and it was replaced. We have bought OE brake fluid according to DOT-3 specifications from ACDelco but I am slightly concerned about DOT-3 being deprecated. Is there a safe way to determine whether the shop switching the master cylinder had used DOT-3 or its successor?

  4. #34
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    Re: P0174 on a 04 Deville

    DOT-3 has been around for quite a while. Probably the least of your worries.

    Brake cube at any NAPA or large local parts store. Use needlenose pliers - the tips.

  5. #35
    c_d
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    Re: sporadic SES light and exotic codes

    While trolling this board, I stumbled across the following picture in another thread:

    Quote Originally Posted by Mr.electric View Post
    I am fairly sure that one of the cables going cruise control actuator box is missing. Will confirm tomorrow. Could that be the reason for the cruise control inhibitor circuit fault?

  6. #36
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    Re: sporadic SES light and exotic codes

    I'm pretty sure that there is only one CC cable and I only see one in that picture.

  7. #37
    c_d
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    Re: sporadic SES light and exotic codes

    Quote Originally Posted by Ranger View Post
    I'm pretty sure that there is only one CC cable and I only see one in that picture.
    Little update: After 5 minutes intensive search, I found the cable bundle and a broken connector under the air filter housing. CC codes went right away. Unfortunately, I had much less luck with the brakes. After disassembling just the RL, I realised that the ACDelco 14D792CH Advantage Rear Ceramic Disc Brake Pad Set does not fit a DTS. Strange, as those have been advertised for code JL9 and shown as exact fit.

    Anyway, the old pads still have some life on them and the car is braking so much better now. Makes one wonder how much difference a good cleaning and proper lubrication of the caliper slide pins can make.

  8. #38
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    Re: sporadic SES light and exotic codes

    After 5 minutes intensive search, I found the cable bundle and a broken connector under the air filter housing.
    Oh, you where talking about electrical "cable" (wire). I thought you meant the throttle cable.

  9. #39
    c_d
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    Re: sporadic SES light and exotic codes

    Update:

    1. The CC is working again after simply re-attaching the cable/wire bundle.

    2. We addressed the rear brakes, changed all pads and rotors. IMHO the mechanic overstated the wear on the brakes quite a bit, since rotors and pads have had half their life on it. Anyway, the new pads produce significantly less dust, so that is a plus. However, after putting all back together and rotating the wheels at the same time, we were puzzled on how we check the proper performance of the replaced parts. The car brakes just as it did before - like a tank Compared to the braking capabilities of my Audi, I sometimes get panic attacks. Anyway, I guess the 1.2 tons weight difference do contribute to that feeling. We thought using the parking break would be a good test, it keeps the car in place on a hill but the car starts turtles away when put in drive. I personally would think that's not too much of an issue since my wifes beetle (manual) had many episodes of her forgetting the parking brake until a "funny smell" happened.

    Is there any way to check that apart from bringing it to a mechanic?

    3. The sporadic SES light is back. He was able to isolate them occurring at prolonged highway speed cruising. I took the car for a trip to the country I was planning anyway and, voila, probably 30 minutes into the trip at 75 mph and very smooth cruising SES came on. I stopped to see two old "friends" saying hello:

    P0171 H - System too Lean (Bank 1)
    P0174 H - System too Lean (Bank 2)

    Funny thing is, at longer drives, the SES light goes OFF as well. The car was on a drive to Galveston with the light on at first and arrived there with SES off. I get another bottle of spray and check the plenum area again just in case I have overlooked something at the first time. I am, maybe wrongly, very hesitant to change the plenum (because of the intake gaskets and everything) if this is not the major reason (The earlier repair with the PCV hose did wonders so far, even the MPG's jumped from below 13 to 18).

    EDIT: It took so long because Amazon send me the wrong pads - I took one old pad and walked into an Advanced to find out the correct part number. i was lucky, a customer returned compatible pads but did not put the springs back in the pack. Got a set of 4 Wearever Ceramic pads for $15 and just recycled (cleaned and made sure they were "springy" enough) the installed springs. The ACDelco Advantage rotors fit perfectly.

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    Re: sporadic SES light and exotic codes

    We thought using the parking break would be a good test, it keeps the car in place on a hill but the car starts turtles away when put in drive.
    Sounds a little like a dragging brake.


    Is there any way to check that apart from bringing it to a mechanic?
    The wheel should be very hot after a short drive.

    I get another bottle of spray and check the plenum area again just in case I have overlooked something at the first time.
    Based on those 2 codes, I still suspect the plenum duct. This time flex it as you spray.

  11. #41
    c_d
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    Re: sporadic SES light and exotic codes

    Quote Originally Posted by Ranger View Post
    Sounds a little like a dragging brake.
    Soory, English is not my first language. Just to avoid any misunderstanding: What I meant to say was simply that after I put the Deville in Drive, it starts going.



    Quote Originally Posted by Ranger View Post
    The wheel should be very hot after a short drive.
    Will check that at the next opportunity.

    Quote Originally Posted by Ranger View Post
    Based on those 2 codes, I still suspect the plenum duct. This time flex it as you spray.
    Thanks for the hint! Can the plenum be changed without taking the intake manifold (?) off (and the whole resealing)?

  12. #42
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    Removing the intake manifold is fairly simple. The only other way to remove the plenum is to remove the coolant crossover. A PITA 6 hour job at BEST.

  13. #43
    c_d
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    Re: sporadic SES light and exotic codes

    I've had an opportunity to check the wheel temperature: after a normal drive the wheels are quite cool, after 40m stop-and-go the wheels are warm but nothing resembling "very hot". We'll check the plenum area with some aerosol today.

    I have two more questions, though:

    1. When the caddy is stopped or going quite slow a subsequent acceleration is a gurgling/sucking liquid displacement sound coming from the engine compartment. What is that?
    2. The transmission fluid condition display is now down to 50%. Is this something he's to worry about?

    Thanks.

  14. #44
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    Re: sporadic SES light and exotic codes

    A gurgling sound is usually air in the cooling system. I'd pin point where it is coming from and check the purge line. You might be hearing it in the heater core.

    Trans fluid life monitor almost always stays at 99 - 100%. The only thing that decrements it is overheating the trans. I'd change the trans fluid.

  15. #45
    c_d
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    Re: sporadic SES light and exotic codes

    Quote Originally Posted by Ranger View Post
    Trans fluid life monitor almost always stays at 99 - 100%. The only thing that decrements it is overheating the trans. I'd change the trans fluid.
    I have not had the time to check the plenum yet but I was discussing (and researching) the transmission fluid change. Here on the board there seems to be an opinion that it needs to be done personally to make sure it's done right and that the mechanic is not damaging the systems by force flushing it. So I guess one of those $49.99 trasmission fluid changes is out of the question?

    If I may trouble you with another question: the Deville's computer sees to suffer from amnesia since a couple of days. I got a call three days ago that the MPG display reset itself to 0.0 for no apparent reason. It continues to do so several times a day right after the car is started. Battery power is ok and all other systems work perfectly. Is this and indicator for yet another big(-er) issue?

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