ECU Diagnostic Codes

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					ECU Diagnostic Codes



How To Read


    •    Turn ignition OFF
    •    Connect read memory connectors (jumper 5) [black connectors]
    •    Turn ignition on (Engine OFF)
    •    Engine check lamp turns on
    •    Code is indicated by Pulsing lamp
    •    If Code is OK then turn ignition OFF & disconnect Connectors
    •    Check ECU Code
    •    Turn ignition OFF & disconnect Connectors
    •    If there is a fault check appropriate sensor



ECU Reset



On early MYs (especially pre MY97) the ECU retards the ignition when knock is detected, however, it is very
slow to advance the timing again. An ECU reset will restore the car to factory default settings. This will
remove any stored fault codes and restore ignition advance. It is possible to reset the ECU by following these
steps:


    •    Turn ignition OFF
    •    Connect Read Memory Connectors & Test Mode Connectors (jumper 5) [black connectors] -
         (jumper 6) [green connectors]
    •    Turn ignition on (engine off)
    •    Engine Check lamp turns on
    •    Depress accelerator pedal completely
    •    Then return it to the half-throttle position and hold it there for two seconds
    •    Release pedal completely
    •    Start engine
    •    Code is indicated by Pulsing lamp
    •    If a fault is detected - Check ECU Code
    •    If no fault is detected - drive the car sensible for a couple of minutes i.e. until warm (do not thrash
         it!)
    •    When the ECU has been reset the Check Engine Light will flash
    •    Code is indicated by Pulsing lamp
    •    If a fault is detected check ECU code
    •    Turn ignition OFF & disconnect connectors
    •    If there is a fault check appropriate sensor




How to interpret the error codes

Reading ECU Codes

The ECU codes are displayed as pulses of the Check Engine Light.
If Check Engine Light goes out there is no fault.
In Diagnostic Mode - No Fault is indicated by the Check Engine Light continuously & evenly flashing on/off
(this is also used to indicate the successful completion of an ECU Reset).
The long pulses (1.3 Seconds) indicate Tens and the short pulses (0.2 Seconds) indicate ones. Pulses are
separated by Short Pauses (0.2 Seconds), multiple codes are separated by a Long Pause (1.8 Seconds).
The simplest way for an inexperienced mechanic to retrieve codes is to write the codes down in a sort of
Morse Code (dots and dashes), and start a new line when you get a 1.8 Second pause (for NEW code), and
then add the actual numbers up after code retrieval is completed.
       (See Example Below)



       --- CODE EXAMPLE, SINGLE CODE ---
       1.3 second pulse (10)
       0.2 second pause
       1.3 second pulse (10....for a total of 20)
       0.2 second pause
       0.2 second pulse (1.....for a total of 21)
       0.2 second pause
       0.2 second pulse (1.....for a total of 22)
       0.2 second pause
       0.2 second pulse (1.....for a total of 23)
       (Code 23 -- MAF Sensor)



       --- CODE EXAMPLE, MULTIPLE CODE ---
       1.3 second pulse (10)
       0.2 second pause
       1.3 second pulse (10....for a total of 20)
       0.2 second pause
       0.2 second pulse (1.....for a total of 21)
       0.2 second pause
       0.2 second pulse (1.....for a total of 22)
       0.2 second pause
       0.2 second pulse (1.....for a total of 23)


       1.8 second pause (this means NEW code)


       1.3 second pulse (10)
       0.2 second pause
       0.2 second pulse (1.....for a total of 11)
       0.2 second pause
       .2 second pulse (1.....for a total of 12)
       (Codes 23 and 12, MAF Sensor and Starter Circuit)




Subaru ECU Codes



Impreza Codes

These are the Impreza Error codes that are documented in the Workshop Manual & Stored in the ECU.
Note - not all error codes are stored and not all are documented (though they are all decoded by a Select Monitor), some
more error codes may be found in the next section.


                      Code                                                           ITEM
                       11                                                 Crankshaft position sensor
                       12                                                       Starter Switch
                       13                                                 Camshaft position sensor
                       21                                            Engine coolant temperature sensor
                       22                                                        Knock sensor
                       23                                                    Mass air flow sensor
                       24                                                  Idle air control solenoid
                       32                                                       Oxygen sensor
                       33                                                   Vehicle speed sensor 2
                       35                                                Purge control solenoid valve
                       42                                                         Idle switch
                       44                                             Wastegate control solenoid valve
                       45                                     Pressure sensor/Pressure exchange solenoid valve
                       51                                                   Neutral position swith
Other Subaru Codes
These codes are not documented in the Impreza Workshop manual but are mentioned in other Subaru Documentation (and
can be decoded by a Select Monitor), these may or may not be applicable to the Impreza.


                    Code                                                           Item
                     11                                             Crank Angle Sensor or Circuit
                     12                                                 Starter Switch or Circuit
                     13                                Cam Position Sensor or Circuit (TDC Sensor on Justy)
                     14                                  Fuel Injector No. 1 (Legacy, Impreza, Justy, SVX)
                     15                                  Fuel Injector No. 2 (Legacy, Impreza, Justy, SVX)
                     16                                  Fuel Injector No. 3 (Legacy, Impreza, Justy, SVX)
                     17                                      Fuel Injector No. 4 (Legacy, Impreza, SVX)
                     18                                                Fuel Injector No. 5 (SVX)
                     19                                                Fuel Injector No. 6 (SVX)
                     21                                        Coolant Temperature Sensor or Circuit
                     22                                     Knock Sensor or Circuit (Right Side on SVX)
                     23                                         Air Flow Meter or Circuit (Exc. Justy)
                     24                                        Air Control Valve or Circuit (Exc. Justy)
                     25                                            Fuel injector No. 3 and 4 (XT-6)
                     26                                            Air Temperature Sensor (Justy)
                     28                                         Knock Sensor No. 2 (SVX, Left Side)
                     29                                           Crank Angle Sensor (SVX, No. 2)
                     31                                           Throttle Position Sensor or Circuit
                     32                                 Oxygen Sensor or Circuit (No. 1, Right Side, on SVX)
                     33                                        Vehicle Speed Sensor (VSS) or Circuit
                     34                                                 EGR Solenoid or Circuit
                     35                                            Purge Control Solenoid or Circuit
                     36                                         Air Suction Solenoid Valve (Impreza)
                     37                                       Oxygen Sensor (No. 2, Left Side, on SVX)
                     38                                              Engine Torque Control (SVX)
                     41                                                Air/Fuel Adaptive Control
                     42                                                  Idle Switch or Circuit
                     43                                                      Throttle Switch
                     44                                       Wastegate Duty Solenoid (Turbo Models)
                     45                                    Pressure Sensor Duty Solenoid (Turbo Models)
                     45                              Atmospheric Pressure Sensor or Circuit (Non-Turbo Models)
                     46                                          Neutral or Parking Switch or Circuit
                     47                                                        Fuel Injector
                     49                                                      Airflow Sensor
                     51                                    Neutral Switch (Manual Transmission Models)
                     51                                  Inhibitor Switch (Automatic Transmission Models)
                     52                                           Parking Brake Switch (Exc. Justy)
                     53                                                   Fuel Pump or Circuit
                     54                                                  Choke Control System
                     55                                          EGR Temperature Sensor or Circuit
                     56                                                        EGR System
                     57                                                Canister Control System
                     58                                                    Air Control System
                     61                                   Fuel Tank Pressure Control Solenoid (Impreza)
                     62                                          Fuel Temperature Sensor (Impreza)
                     63                                         Fuel Tank Pressure Sensor (Impreza)
                     64                                         Vacuum Line Control Valve or Circuit
                     65                                                Vacuum Pressure Sensor
                     66                                                Sequential turbo system
                     67                                      Exhaust valve solenoid (positive pressure)
                     68                                              Exhaust valve duty solenoid
                     71                                                  Ignition Pulse System
                     73                                                  Ignition Pulse System
                     74                                                  Ignition Pulse System
                     88                                                     TBI Control Unit
Sensors
Sensors
   Sensor   Diagnostics
       -    Starter switch is abnormal

       -    Neutral position switch is abnormal.(AT)

       3    Wastegate control solenoid valve is not functioning

       1    Pressure sensor is abnormal

       2    Pressure exchange solenoid valve is not functioning

       5    Mass air flow sensor signal is abnormal

       6    Oxygen sensor is not functioning

       7    Vehicle speed sensor 2 is not functioning

       8    Engine coolant temperature sensor signal is abnormal

       9    Throttle position sensor signal is abnormal

       9    Idle switch signal is abnormal

      10    Idle air control solenoid valve is not functioning

      11    Knock sensor signal is abnormal

      12    No signal from camshaft position sensor, but signal from crankshaft position sensor

      13    No signal from crankshaft position sensor when starter switch is on

      14    Purge control solenoid valve is not functioning

				
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