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SMEC Turbo Fault Codes and Descriptions

Displaying and Reading Trouble Codes

If suitable diagnostic read-out tool is not available, stored fault codes can be accessed directly through the power loss/check engine lamp. To call up codes, cycle ignition switch on, off, on, off and on within 5 seconds. Stored codes will be indicated by flashes of the power loss/check engine lamp. The codes will be indicated as two digit numbers, with a four second pause between codes.

An example of a code is as follows:
  1. Power Loss/Check Engine Lamp illuminated for approximately 2 to 3 seconds as a bulb check, then turns off.
  2. Lamp flashes two times, pauses, then flashes six times.
  3. Lamp pauses for approximately four seconds.
  4. Lamp flashes three times, pauses, then flashes one time.
  5. This would indicate that code 26 and 31 are stored. The lamp will continue to flash until all stored codes have been displayed.
Once the lamp starts flashing the stored fault codes, it cannot be stopped. If a code is missed, the entire procedure must be repeated.

Code Descriptions
  • Code 11 - Distributor signal circuit
    When monitored​
    - During cranking
    When placed in memory - If no signal is present since memory was last cleared.
  • Code 12 - Battery feed to computer
    When monitored​
    - Ignition on
    When placed in memory - If battery disconnected in last 30-100 engine starts.
  • Code 13 - MAP sensor, vacuum
    When monitored​
    - From 600 to 1500 rpm
    When placed in memory - No change in signal between ignition pulses.
  • Code 14 - MAP sensor, electrical
    When monitored​
    - From 400 to 1500 rpm
    When placed in memory - MAP sensor above 4.7V or below .02V.
  • Code 15 - Speed sensor
    When monitored​
    - Decel at closed throttle
    When placed in memory - If less than 2 mph indicated for over 7-10 seconds on decel.
  • Code 16 - Battery sense voltage
    When monitored​
    - 1 min after start
    When placed in memory - Battery voltage drops 4 volts for more then 14 sec.
  • Code 17 - Cooling system
    When monitored​
    - 12 min after start
    When placed in memory - Coolant doesn't reach 160 degrees after 8 min.
  • Code 21 - Oxygen sensor
    When monitored​
    - Temp 170F/ RPM over 1500 
    When placed in memory - If no rich/lean indicated for 2-12 min.
  • Code 22 - Coolant sensor
    When monitored​
    - Ignition on
    When placed in memory - If voltage above 4.96(cold) or below .51(warm)
  • Code 23 - Charge air sensor
    When monitored​
    - Ignition on
    When placed in memory - If voltage above 4.96(cold) or below .51(warm)
  • Code 24 - Throttle P. sensor
    When monitored​
    - Ignition on
    When placed in memory - If voltage above 4.7 or below .16
  • Code 25 - Idle speed motor
    When monitored​
    - Engine at idle
    When placed in memory - Proper voltage not present, open circuit will not set.
  • Code 26 - Fuel injectors 1 & 2
    When monitored​
    - Engine cranking
    When placed in memory - 85-87 injectors not firing correctly
  • Code 27 - Fuel injectors 3 & 4
    When monitored​
    - Engine cranking
    When placed in memory - 85-87 injectors not firing correctly
  • Code 31 - Purge solenoid
    When monitored​
    - Ignition on
    When placed in memory - Solenoid not turning on and off properly
  • Code 32 - Power loss lamp 
    When monitored​
    - Ignition on
    When placed in memory - 84-86 lamp not working correctly
  • Code 33 - A/C relay
    When monitored​
    - Ignition on
    When placed in memory - Relay not turning on and off properly. This can post on a car that didn't come with A/C! Thanks markrochesterrc !!
  • Code 34 - EGR solenoid
    When monitored​
    - Ignition on
    When placed in memory - 84-86 solenoid not turning on and off properly
  • Code 34 - Speed control
    When monitored​
    - Engine running
    When placed in memory - 87-88 servo not working properly when cruise is on
  • Code 35 - Radiator fan relay
    When monitored​
    - Ignition on
    When placed in memory - Relay not turning on and off properly
  • Code 36 - Wastegate control
    When monitored​
    - Ignition on
    When placed in memory - 85-88 solenoid not turning on and off properly
  • Code 37 - Baro read solenoid
    When monitored​
    - Ignition on
    When placed in memory - Solenoid not turning on and off properly
  • Code 41 - Alternator Field
    When monitored​
    - Ignition on
    When placed in memory - Battery volts to ASD is below 11.75 for more than 22 sec
  • Code 42 - Auto shutdown relay
    When monitored​
    - Ignition on
    When placed in memory - Relay not turning on and off properly
  • Code 43 - Spark control
    When monitored​
    - Ignition on
    When placed in memory - 84-86 S.C.Interface fails to switch properly
  • Code 43 - Spark control
    When monitored​
    - During cranking
    When placed in memory - 87-88 S.C.Interface fails to switch properly
  • Code 44 - Logic module
    When monitored​
    - Ignition on
    When placed in memory - 84 only wrong PROM in logic module
  • Code 44 - Battery temp voltage
    When monitored​
    - During cranking
    When placed in memory - 85-87 sensor signal above 4.9 or below .04
  • Code 44 - Fused J-2
    When monitored​
    - Ignition on
    When placed in memory - 88 J2 not present to logic module in SMEC
  • Code 45 - Overboost monitor
    When monitored​
    - Engine running
    When placed in memory - Boost out of predetermined range
  • Code 46 - Battery volt sensing
    When monitored​
    - Engine running
    When placed in memory - Battery volts 1 volt above desired for more than 25 sec
  • Code 47 - Battery volt sensing
    When monitored​
    - Engine running/160F
    When placed in memory - Battery volts 1 volt below desired for more than 35 sec
  • Code 51 - Oxygen sensor
    When monitored​
    - Engine running/closed loop
    When placed in memory - 84 rich/lean more than 2 min/85-88 lean more than 12 min
  • Code 52 - Oxygen sensor
    When monitored​
    - Engine running/closed loop
    When placed in memory - 85-88 rich more than 12 min
  • Code 52 - Logic module failure
    When monitored​
    - Ignition on
    When placed in memory - 84 Logic module failure
  • Code 53 - Logic module failure
    When monitored​
    - Ignition on
    When placed in memory - 85-86 Logic module failure
  • Code 54 - Dist.Sync.pickup
    When monitored​
    - Engine running
    When placed in memory - No signal at logic module
  • Code 55 - End of Codes
 
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