Question about 1995 Plymouth Acclaim

4 Answers

I have check engine codes 12 and 21 on a 1995 Plymouth Acclaim.

What do they mean?

Thanks.

Posted by on

  • nukeman862 Dec 25, 2008

    Would this cause engine sputter and intermittent loss of power, but still allow the car to run enough to drive it?



  • nukeman862 Dec 25, 2008

    Would a bad alternator problem of this sort cause the car to sputter and experience momentary losses of power? Or would it run at all? This car runs, but has the sputtering/power loss problems.

    Thanks.

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12 Battery or computer recently disconnected
21 Oxygen sensor signal doesn't change (stays at 4.3-4.5V). Probably bad oxygen sensor

I hope this helps. Please let me know and thank you. Binary Bob

Posted on Dec 25, 2008

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Hi and welcome to FixYa,

Initially, I was made to understand that trouble codes:

  • 12 indicates that the battery has been recently disconnected and the ECM (computer) has performed a reset;
  • 21 refers to O2 sensor error at the catalytic converter. The O2 reading should be varying but it is not.
Of the two, trouble code 12 is merely a status report while 21 on the otherhand would affect how the computer regulates the air/fuel mixture. Since it is receiving an erroneous O2 level, the computer tries to compensate the air/fuel mix to correct error (whether there is really an error or not). This would cause erratic idling and up/down engine speed when driving. It will not cause the engine to die but the computer works overtime to try and correct certain conditions that would never be met since the O2 sensor is probably faulty.

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 25, 2008

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21 code is clearly an oxygen sensor problem
12 battery disconnected/ memory cleared last

Posted on Dec 25, 2008

  • Sibananda Jena
    Sibananda Jena Dec 25, 2008

    code list...

    11 No ignition reference signal detected during cranking (bad Hall
    effect) OR timing belt skipped one or more teeth; OR loss of either
    camshaft or crankshaft position sensor. Can cause the engine to stop
    working entirely with no limp-home mode.

    12 Battery or computer recently disconnected

    13* MAP sensor or vacuum line may not be working

    14* MAP sensor voltage below .16V or over 4.96V

    15 No speed/distance sensor signal

    16* Loss of battery voltage detected with engine running

    17 Engine stays cool too long (bad thermostat or coolant sensor?)

    17 (1985 turbo only): knock sensor circuit



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





    21 Oxygen sensor signal doesn't change (stays at 4.3-4.5V). Probably bad oxygen sensor

    22* Coolant sensor signal out of range - May have been disconnected to set timing

    23* Incoming air temperature sensor may be bad

    24* Throttle position sensor over 4.96V (SEE NOTE #3)

    25 Automatic Idle Speed (AIS) motor driver circuit shorted or target idle not reached, vacuum leak found

    26 Peak injector circuit voltage has not been reached (need to check
    computer signals, voltage reg, injectors) (SEE NOTE #4 BELOW)

    27 Injector circuit isn't switching when it's told to (TBI)

    OR (MPI) injector circuit #1 not switching right

    OR (turbo) injector circuit #2 not switching right

    OR (all 1990-) injector output driver not responding

    - check computer, connections





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





    31 Bad evaporator purge solenoid circuit or driver

    32 (1984 only) power loss/limited lamp or circuit

    32 EGR gases not working (1988) - check vacuum, valve

    32 (1990-92, all but Turbo) computer didn't see change in air/'fuel
    ratio when EGR activated - check valve, vacuum lines, and EGR
    electrical

    33 Air conditioning clutch relay circuit open or shorted (may be in the wide-open-throttle cutoff circuit)

    34 (1984-86) EGR solenoid circuit shorted or open

    34 (1987-1991) speed control shorted or open

    35 Cooling fan relay circuit open or shorted

    35 (trucks) idle switch motor fault - check connections

    36 (turbo) Wastegate control circuit open or shorted

    36 (3.9/5.2 RWD) solenoid coil circuit (air switching)

    36 (Turbo IV) #3 Vent Solenoid open/short

    37 Shift indicator light failure, 5-speed

    OR

    part throttle lock/unlock solenoid driver circuit (87-89)

    OR

    solenoid coil circuit (85-89 Turbo I-IV)

    OR

    Trans temperature sensor voltage low (1995 and on; see NOTE 2)





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





    41* Alternator field control circuit open or shorted

    42 Automatic shutdown relay circuit open or shorted

    42 Fuel pump relay control circuit

    42 Fuel level unit - no change over miles

    OR

    42 Z1 voltage missing when autoshutdown circuit energized (SEE NOTE #6)

    43 Peak primary coil current not achieved with max dwell time

    OR

    43 Cylinder misfire

    OR

    43 Problem in power module to logic module interface

    44 No FJ2 voltage present at logic board

    OR

    44 Logic module self-diagnostics indicate problem

    OR

    44 Battery temperature out of range (see Note #1!)

    45 Turbo boost limit exceeded (engine was shut down by logic module)

    46* Battery voltage too high during charging or charging system voltage too low

    47 Battery voltage too low and alternator output too low





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





    51 Oxygen sensor stuck at lean position (Bob Lincoln wrote: may be
    tripped by a bad MAP sensor system causing a rich condition, and the O2
    sensor trying to compensate. The O2 sensor may still be good. The MAP
    assembly consists of two pieces, the valve and the vacuum transducer
    (round plastic unit with cylinder on top and both electrical and vacuum
    connections) - If you get hot rough idle and stalling, especially on
    deceleration, accompanied by flooded engine and difficulty restarting,
    that can be a bad MAP sensor causing the O2 sensor to try to
    compensate. If you get poor cold driveability, stumbling and bucking,
    and acceptable warm driving with poor gas mileage (a drop of 10 mpg or
    more), that is usually the O2 sensor. [Webmaster note: MAP sensors seem
    to die regularly.]

    OR



    51 Internal logic module fault ('84 turbo only).

    52 Oxygen sensor stuck at rich position (SEE NOTE #5!)

    OR

    52 Internal logic module fault ('84 turbo only)

    53 Logic module internal problem

    54 No sync pickup signal during engine rotation (turbo only)

    OR

    54 Internal logic module fault ('84 turbo only) - or camshaft sensor/distributor timing (7)

    55 End of codes




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Fault code 12 is that the battery has been diconected within the last 50 key-on cycles.
fault code 21 or 41 is bad alternator. an open orshorted condition detected in the alternator field control circuit.

Posted on Dec 25, 2008

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