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Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, Service Stability System AND abs Pump issue in Cadillac Escalade Forums; ...
  1. #16
    sk7's Avatar
    sk7
    sk7 is offline Cadillac Owners Connoisseur
    Automobile(s): 2002 Escalade AWD
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    Re: Service Stability System AND abs Pump issue

    Info from the FSM:

    --------------------------------------------------------------------------------

    DTC C0282, C0285, or C0286
    Circuit Description
    The brake pressure modulator valve (BPMV) contains a medium pressure accumulator (MPA). The MPA provides pressure to the front brakes during certain VSES events. The MPA switch is included to monitor the status of the pressure accumulator. The MPA switch is open when the MPA is uncharged.

    The integrity of the MPA switch is tested by the EBCM. The MPA is partially discharged during system initialization to open the switch, and then recharged to close the switch. The EBCM continues to monitor the switch to ensure the MPA remains charged. Provided the VSES is not activated, the MPA should remain charged for the entire ignition cycle. If the MPA switch opens within 5 minutes of closing, a fast leakdown condition is detected. If the MPA switch opens after 5 minutes has passed, a slow leakdown condition is detected.

    Conditions for Running the DTC
    C0282 and C0285

    The ignition is ON.
    The vehicle speed is greater than 12 km/h (8 mph).
    C0286

    The ignition is ON.
    The MPA switch is closed.
    The diagnostic tests for DTC C0282 and C0285 have ran and passed.
    Conditions for Setting the DTC
    C0282
    The MPA switch remains closed when the MPA is discharged for 1-2 seconds, depending on ambient temperature.

    C0285
    During the MPA charging period, the MPA switch does not close within the time indicated on the following table.

    Ambient Temperature
    Fault Timer

    Greater than 0C (32F)
    86 sec

    Between -30C and 0C

    (-22F and 32F)
    170 sec

    Less than -30C (-22F)
    230 sec

    C0286
    Any of the following conditions may cause DTC C0286 to set.

    The EBCM detects 2 fast MPA leakdowns during the system initialization period.
    The EBCM detects 3 fast MPA leakdowns after the system has initialized.
    The sum of the fast and slow MPA leakdowns detected after the system has initialized equals 7.
    Action Taken When the DTC Sets
    The EBCM disables the VSES.
    The message center displays the SERVICE STABILITY SYSTEM message.
    Conditions for Clearing the DTC
    The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.

    Diagnostic Aids
    Thoroughly inspect the MPA switch jumper harness for any condition that may cause an intermittent malfunction. Refer to Testing for Electrical Intermittents , Testing for Intermittent and Poor Connections , Wiring Repairs and Connector Repairs in Wiring Systems.

    An intermittent DTC may be difficult to verify since the DTC may take a substantial amount of time to set. If a DTC continues to set intermittently, remove the MPA switch and activate the switch by pressing and releasing the plunger. Ensure the plunger movement is smooth and that the plunger releases readily without sticking. Observe the MPA Switch input on the scan tool to verify that the status changes from Uncharged to Charged every time the switch is pressed. Replace the BPMV if no fault is found in the switch, circuitry or connections. Refer to Brake Pressure Modulator Valve (BPMV) Replacement .

    Test Description
    The numbers below refer to the step numbers on the diagnostic table.

    This step simulates an open MPA switch.

    This step simulates a closed MPA switch.

    This step tests the MPA switch by closing the switch manually.

    This step tests the MPA switch by ensuring the switch plunger is in the open position.

    Step
    Action
    Yes
    No

    Schematic Reference: ABS Schematics


    Important
    The introduction of air into the brakes' hydraulic system due to a BPMV replacement or for any other reason may cause DTC C0285 or C0286 to set. If it suspected that air may have been introduced to the hydraulic system, use the scan tool to perform the VSES Automated Bleed procedure and the Bleed MPA procedure before proceeding with this diagnostic table. You must refer to ABS Automated Bleed Procedure for complete system bleeding instructions.


    1
    Did you perform the ABS Diagnostic System Check?
    Go to Step 2
    Go to Diagnostic System Check - ABS

    2
    Use a scan tool in order to clear the DTCs.
    Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text for 10 minutes or until the DTC resets.
    Does the DTC reset?
    Go to Step 3
    Go to Diagnostic Aids

    3
    Turn ON the ignition.
    Select the VSES Data List on the scan tool.
    Observe the MPA Switch input on the scan tool.
    Does the scan tool display Charged?
    Go to Step 4
    Go to Step 5

    4
    Turn OFF the ignition.
    Disconnect the MPA switch harness connector.
    Turn ON the ignition.
    Observe the MPA Switch input on the scan tool.
    Does the scan tool display Uncharged?
    Go to Step 7
    Go to Step 9

    5
    Turn OFF the ignition.
    Disconnect the MPA switch harness connector.
    Use a fused jumper wire to connect the MPA switch supply circuit to the MPA switch signal circuit. Refer to Using Fused Jumper Wires in Wiring Systems.
    Turn ON the ignition.
    Observe the MPA Switch input on the scan tool.
    Does the scan tool display Charged?
    Go to Step 6
    Go to Step 8

    6
    Remove the MPA switch from the BPMV. Refer to Pressure Accumulator Switch Replacement .
    Reconnect the MPA switch harness connector.
    Press and hold the MPA switch plunger.
    Observe the MPA Switch input on the scan tool.
    Does the scan tool display Charged?
    Go to Step 15
    Go to Step 12

    7
    Remove the MPA switch from the BPMV. Refer to Pressure Accumulator Switch Replacement .
    Reconnect the MPA switch harness connector.
    Observe the MPA Switch input on the scan tool.
    Does the scan tool display Uncharged?
    Go to Step 15
    Go to Step 14

    8
    Test the MPA switch supply circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

    Did you find and correct the condition?
    Go to Step 16
    Go to Step 10

    9
    Test the MPA switch signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

    Did you find and correct the condition?
    Go to Step 16
    Go to Step 13

    10
    Test the MPA switch signal circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

    Did you find and correct the condition?
    Go to Step 16
    Go to Step 11

    11
    Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

    Did you find and correct the condition?
    Go to Step 16
    Go to Step 13

    12
    Inspect for poor connections at the harness connector of the MPA switch. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

    Did you find and correct the condition?
    Go to Step 16
    Go to Step 14

    13

    Important
    Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure.


    Replace the EBCM. Refer to Electronic Brake Control Module (EBCM) Replacement .

    Did you complete the replacement?
    Go to Step 16
    --

    14
    Replace the MPA switch. Refer to Pressure Accumulator Switch Replacement .

    Did you complete the replacement?
    Go to Step 16
    --

    15

    Important
    DTC C0285 or C0286 may set after BPMV replacement if the VSES Automated Bleed procedure and the Bleed MPA Procedure are not performed exactly as specified in the service manual instructions. Refer to ABS Automated Bleed Procedure (w/JL4) for complete bleed instructions.


    Replace the BPMV. Refer to Brake Pressure Modulator Valve (BPMV) Replacement .

    Did you complete the replacement?
    Go to Step 16
    --

    16
    Use a scan tool in order to clear the DTCs.
    Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text for 10 minutes or until the DTC resets.
    Does the DTC reset?
    Go to Step 3
    System OK



    --------------------------------------------------------------------------------
    Document ID# 737684
    2002 Cadillac Escalade

  2. #17
    ewill3rd is offline Cadillac Technician
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    Re: Service Stability System AND abs Pump issue

    If it is a code for the MPA then it very likely needs a new BPMV (brake pressure modulator valve).
    They are expensive and exceedingly complicated to replace.
    There was a TSB that stated it could be a problem with a sensor for the MPA but that never works to fix it.
    I just replace the whole unit.

  3. #18
    crthorne's Avatar
    crthorne is offline Cadillac Owners Member
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    Re: Service Stability System AND abs Pump issue

    ABS code 286 is a mpa switch (medium pressure accumulator) There's a tsb on this condition & it did not fix our 02 escapade. New switch is gray not black, the black switch will not fix problem. Well neither did the gray one. It says to perform both bleed procedures & still has same problem. As soon as you hit 8 mph service stability system message pops up and 286 is the code. HELP!!

  4. #19
    ewill3rd is offline Cadillac Technician
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    Re: Service Stability System AND abs Pump issue

    As stated, if the MPA switch didn't fix it (which it never does) then it needs a BPMV.
    Expensive and difficult to replace.

  5. #20
    machflite is offline Cadillac Owners Member
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    Re: Service Stability System AND abs Pump issue

    Hey sk7,

    I found this quote you made about "bypassing" the unit altogether - interesting theory as I bought a wrecked 05 ESV and own a 02 Suburban that I am putting all the caddi body/interior and other goodies into - less the wrecked front end. I think i have everything figured out except how to bypass this part of the so called goodies... I left my master cylinder and the ABS pump from the 02 in place as i intend to just put the power booster from the old suburban back in and use the 02 brake system instead. The dilemma is the pumps are a tad bit different on the pump manifold and the electrical connector is entirely different. By leaving the 02 system in - have I already bypassed it and just need to have the 05 stabilitrak/ABS stuff programmed out when i get it reprogrammed? Is there a way to splice into the 05 wiring harness and utilize the capabilities of the 02's ABS module? Or just leave it like it is and use my brakes like we used to before all this ABS/Traction Control junk came along?

    Thanks for your input!

    Quote Originally Posted by sk7 View Post
    Bpc87, it sure sounds like the ABS pump going into self test mode. The EBCM is right under the drivers seat, attached to the frame. I'll tell you the same advice I gave to ezext, those modules are prone to failure, and a pita to remove. And even if the repair is successfull, then there's always the front bearings that are also a weak link, and the steering position sensor... Bypass the unit and live happly ever after! ATE wasnt able to fix my EBCM. I'ts ur call! You can find some info into a thread that pcguy wrote on his EBCM (codes, pics, etc); I forget the exact title...

  6. #21
    anm022771 is offline Cadillac Owners Member
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    Re: Service Stability System AND abs Pump issue

    I got my ABS disconected because when i braked pedal started jumping & noising,soon after that my 02 Escalade loose power i push gas pedal all way down and it doesn`t respond.It has been 3 days with this issue i got ABS disconnected car is running fine but I got ABS , BRAKE, and SERVICE STABILITY CONTROL on all the time on dash.Some help please

  7. #22
    clj76 is offline Cadillac Owners Member
    Automobile(s): 2005 Escalade
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    Re: Service Stability System AND abs Pump issue

    I have an 05 and tonight the service stability message came on and my brakes locked up. By the time I got home the brakes reaked and the rims were on fire. What is the problem?

  8. #23
    sosatime is offline Cadillac Owners Member
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    Re: Service Stability System AND abs Pump issue

    same thing happened to me if you hear bussing when you start to drive and youre steering pulls to the left for a quick second you probably have C0286 you have to buy the ACDelco 88983913 ABS Modulator that will take care of the problem but if you go to the Dealers (stealers) they will sell you the modulator and the module probably looking at $1,700 for modulator and $1,800 for module plus another $1,200 in labor if you're lucky. first what i did was to read the code c0286 or co285 modulator is leaking inside then I sent my module for repair (cheapest) I installed it and same problem so had no choice to buy the modulator right after that the buzzing went away but the light was still on so I bought a pump bleader and bled the brakes and after 2 weeks lights off. i did the work myself and save me thousands.. $$$$

    ----------

    I had the brakes lock up on me also I would shut truck off and restart sometimes it would work but they lock up pretty bad and smells pretty bad. buy a Innova that reads abs codes probably about $179.00 dealers want about $120to $150 just to read a code.

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