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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.
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12 Battery or computer recently disconnected
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13* MAP sensor or vacuum line may not be working
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14* MAP sensor voltage below .16V or over 4.96V
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>15 No speed/distance sensor signal
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16* Loss of battery voltage detected with engine running
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17 Engine stays cool too long (bad thermostat or coolant sensor?)
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17 (1985 turbo only): knock sensor circuit
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21 Oxygen sensor signal doesn't change (stays at 4.3-4.5V). Probably bad oxygen sensor
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22* Coolant sensor signal out of range - May have been disconnected to set timing
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23* Incoming air temperature sensor may be bad
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24* Throttle position sensor over 4.96V (SEE NOTE #3)
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25 Automatic Idle Speed (AIS) motor driver circuit shorted or target idle not reached, vacuum leak found
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26 Peak injector circuit voltage has not been reached (need to check computer signals, voltage reg, injectors) (SEE NOTE #4 BELOW)
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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
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31 Bad evaporator purge solenoid circuit or driver
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32 (1984 only) power loss/limited lamp or circuit
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32 EGR gases not working (1988) - check vacuum, valve
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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
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33 Air conditioning clutch relay circuit open or shorted (may be in the wide-open-throttle cutoff circuit)
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34 (1984-86) EGR solenoid circuit shorted or open
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34 (1987-1991) speed control shorted or open
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35 Cooling fan relay circuit open or shorted
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35 (trucks) idle switch motor fault - check connections
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36 (turbo) Wastegate control circuit open or shorted
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36 (3.9/5.2 RWD) solenoid coil circuit (air switching)
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36 (Turbo IV) #3 Vent Solenoid open/short
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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)
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41* Alternator field control circuit open or shorted
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42 Automatic shutdown relay circuit open or shorted
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42 Fuel pump relay control circuit
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42 Fuel level unit - no change over miles
OR
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42 Z1 voltage missing when auto shutdown circuit energized (SEE NOTE #6)
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43 Peak primary coil current not achieved with max dwell time
OR
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43 Cylinder misfire
OR
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43 Problem in power module to logic module interface
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44 No FJ2 voltage present at logic board
OR
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44 Logic module self-diagnostics indicate problem
OR
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44 Battery temperature out of range (see Note #1!)
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45 Turbo boost limit exceeded (engine was shut down by logic module)
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46* Battery voltage too high during charging or charging system voltage too low
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47 Battery voltage too low and alternator output too low
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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 drivability, stumbling and bucking, and acceptable warm driving with poor gas mileage (a drop of 10 mpg or more), that is usually the O2 sensor.
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We provide our customers with a 15 day, unconditional, return privilege that begins the day you receive your item. If for any reason you decide the item is not right for you, simply return the item to us along with a COPY of your original receipt. There is a 15% restock fee on NEW items. Payments received via PayPal are refunded through paypal. If other payment options are used a check will be used to refund your money. Refunds are processed within two business days from the receipt of the retuned item. Please be sure to include your full contact information.
