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ABS code 4-4-3 came on after heavy rain??? 850 1993

posted by  viggen_78 on  Mon Jun 9 02:19 CST 2003
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Hi...

My 93 850 aka "Money Pit" decided to once again pull a fast one on me last night. I drove home from work in some heavy rain last night and parked the car. Went to start it this morning (no rain) and the ABS light did it's normal quick flicker and turned off only to come right back on. I pulled the codes and got 4-4-3 (which for this year is the ABS pump. I am wondering if water may have for some strange reason gotten into something and caused it to crap out. I have no idea. I check all the connections and they were dry this morning. I cleared the code and it just came back as soon as the car was started. I love the car but I have put too much money into it in the last few months (pnp switch, rear main seal, water pump, cmp sensor, and hopefully not an ABS module too).

Any ideas as to where or how I should go about this?

Thanks,
Nate Brown

93 850GLT 155K








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    ABS code 4-4-3 came on after heavy rain??? 850 1993

    posted by  Hamfisted on  Mon Jun 9 15:37 CST 2003
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    Nathan I sent you a seperate email so I could include the diagram they reference, but this is the troubleshooting steps from the shop manual. Could be something as simple as a fuse. There's a few things to check, here's what the book says:

    DTC 4-4-3: PUMP MOTOR, ELECTRICAL OR MECHANICAL FAULT

    1) DTC 4-4-3 is set when control module activates pump motor
    and detects that voltage between terminals No. 39 and 49 is not at
    least 500 millivolts AC. Disconnect combination relay 15-pin connector
    located next to hydraulic modulator. See Fig. 4.

    2) Connect voltmeter between relay connector terminal No. 15
    and ground. If battery voltage is present, go to next step. If battery
    voltage is not present, check for an open circuit in fuse or wiring.

    3) Connect voltmeter between relay connector terminals No. 2
    and 15. If battery voltage is present, go to next step. If battery
    voltage is not present, check wiring to ground for an open or short
    circuit.

    4) Disconnect combination relay 4-pin connector located next
    to hydraulic modulator. Connect an ohmmeter between relay connector
    terminals No. 2 and 4. See Fig. 4. Ohmmeter should indicate 10-40
    ohms. Connect ohmmeter between 4-pin connector terminal No. 2 and
    ground. Ohmmeter should indicate no continuity. If one reading is
    incorrect, replace hydraulic modulator. If both readings are correct,
    go to next step.

    5) Connect jumper wire between 15-pin connector terminal No.
    2 and 4-pin connector terminal No. 3. Connect another jumper wire
    between 15-pin connector terminal No. 15 and 4-pin connector terminal
    No. 1. If pump motor operates, leave jumper wires in place and go to
    next step. If pump motor does not operate, replace hydraulic
    modulator.

    6) Connect voltmeter between 4-pin connector terminals No. 4
    and 2. Voltmeter should read greater than .5 volts AC while pump motor
    is running. Remove jumper wires. If voltage was to specification, go
    to next step. If voltage was not to specification, replace hydraulic
    modulator.

    7) Connect an ohmmeter between 4-pin relay connector terminal
    No. 1 and 15-pin relay connector terminal No. 15. Ohmmeter should
    indicate no continuity. Connect ohmmeter between 4-pin relay connector
    terminal No. 3 and 15-pin relay connector terminal No. 2. Ohmmeter
    should indicate zero ohms. Connect ohmmeter between 4-pin relay
    connector terminal No. 2 and 15-pin relay connector terminal No. 8.
    Ohmmeter should indicate zero ohms.

    8) Connect ohmmeter between 4-pin relay connector terminal
    No. 4 and 15-pin relay connector terminal No. 7. Ohmmeter should
    indicate zero ohms. Connect ohmmeter between 15-pin connector
    terminals No. 10 and 13. Ohmmeter should indicate 45-90 ohms.

    9) If any resistance readings are not to specification,
    replace combination relay. If all resistance readings are to
    specification, connector connectors and go to next step.

    10) Connect test box to control module. See Fig. 3. Connect a
    jumper wire between test box terminal No. 15 and voltage. If pump
    motor operates, go to next step. If pump motor does not operate, check
    if combination relay wiring is shorted or open. If wiring is okay,
    replace combination relay.

    11) Connect ohmmeter between test box terminals No. 31 and
    49. If ohmmeter indicates 10-40 ohms, go to next step. If ohmmeter
    does not indicate 10-40 ohms, check for an open circuit.

    12) Connect an ohmmeter between test box terminals No. 1 and
    49, then between test box terminals No. 1 and 31. If ohmmeter
    indicates an open circuit, replace control module. If ohmmeter
    indicates a closed circuit, check for a short to ground. If no short
    is present, replace combination relay.


    Hope this helps....







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