Diagnostika OBD1 Subaru
Subaru Trouble Code Info
Retrieving Trouble Codes
96 - later are OBD2 systems
There are self-diagnositic connectors on all models, when connected with the key ON (engine off), flash trouble codes on the LED light of the oxygen moniter of the ECU.
Images used with permission Copyright � 2001 ALLDATA LLC.
- The connectors are under the steering wheel, to the left of the module on most models.
- On carberated and SPFI injected 89 models,the test connectors are located on the engine side/driver's side of the firewall.
- Imprenza models have the ECU and test connectors located behind the right side of the dash, instead of the left.
- On SVX models the connectors are located behind the driver's side kick panel.
Test Modes
-
- With neither test connector connected and the key ON(not running), the codes will display codes related to starting and driving.
- With only the Read Memory connector connected, historic codes will be displayed.
- With only the Test Mode connector connected, a technician can perform dynamic tests.
- The last mode is for clearing codes.(See Clearing Codes)
Reading Trouble Codes
The codes are displayed as pulses of the LED mounted on the module. Long pulses (1.2 seconds) indicate tens and the short pulses (.2 seconds) indicate ones. Pulses are seperated by .3 second puses and codes are seperated by 1.8 second pauses. NOTE:on 89 MPFI models, the Oxygen Moniter light and ECU are mounted under the rear package shelf and are only accessible from the trunk.
On some later models the Check engine lamp and O2 monitor lamp flash the code(s) corresponding to the faulty part. The long segment (1.2 sec on) indicates a ten, and the short segment (0.2 sec on) signifies a one.
- 90 models - Trouble codes on the Justy are viewed on the Oxygen Moniter light, all other models the codes can be viewed on either the Oxygen Moniter light or the MIL (check engine light).
- 95 Imprenza and Legacy models have OBD2 systems and require a scanner,but some basic codes can be retreived using the flashing MIL method.
Clearing Codes
Codes will only clear when the faulty system or circuit has been repaired. After making the repairs, codes can be cleared by connecting 2 pairs of connectors, the Self-diagnostic connectors and the Read Memory connectors that are usually to the right of the diagnostic connectors.
- Start with a warmed up engine
- Turn off the engine
- Connect both pairs of connectors
- Fianlly start the engine
- This should clear the codes.
Trouble Codes
| 83 - 88 Subaru carb models | |
| 11 | Ignition pulse system/crank angle sensor(87 - later) |
| 12 | Ignition pulse system (1983 only)/Starter switch (84 - later) |
| 13 | Crank angle sensor or circuit |
| 14 | Vacuum switches stay on or off (1983 only)/Duty solenoid or circuit(1983 to 1985)/Injectors 1 - 2 (87-up) |
| 15 | Solenoid valve stays on or off (1983 only)/Coasting Fuel Cut (CFC) system (1983 to 1985 ) |
| 16 | Feedback system (1983 to 1985 models) |
| 17 | Fuel pump and automatic choke (1983 to 1985 carbureted) |
| 21 | Ignition pulse system (1983 only)/coolant temperature sensor or circuit (1983 to 1985 carbureted) |
| 22 | Ignition pulse system (1983 only)/Vehicle speed sensor or circuit or VLC solenoid valve or circuit. (1984 to 1988 carbureted) |
| 23 | Oxygen sensor or circuit (1983 to 1988)/pressure sensor or circuit (1983 to 1985) |
| 24 | Vacuum switches stay on or off (1983 only)/coolant temperature sensor or circuit, or Idle-up solenoid or circuit (1984 to 1988 carbureted) |
| 25 | Manifold vacuum sensor or circuit/coolant temperature sensor or circuit on 1984 models)/float chamber vent solenoid valve or circuit (1983 to 1985) |
| 32 | Coolant temperature sensor or circuit (1983)/Oxygen sensor or circuit (1984 to 1988) |
| 33 | Main system in feedback (1983 to 1988)/Vehicle speed sensor or circuit (1983 to 1985) |
| 34 | Choke power stays on or off (1983)/EGR system solenoid or circuit (1883 to 1988) |
| 35 | Canister purge solenoid or circuit (1983 to 1985) |
| 41 | Vacuum switches stay on or off (1983 only)/Feedback system (California models 1983 to 1985) |
| 42 | Vacuum switches stay on or off (1983 only)/clutch switch or circuit (1983 to 1988) |
| 43 | Choke power stays on or off (1983) |
| 46 | Radiator fan control (1983 to 1985) |
| 52 | Solenoid valve control system or clutch switch |
| 53 | Fuel pump circuit or Altitude compensator switch |
| 54 | Choke control system |
| 55 | Upshift control or EGR sensor |
| 56 | EGR system |
| 62 | Exhaust Gas Recirculation (EGR) solenoid valve control or Idle-up system |
| 63 | Canister solenoid valve or circuit/Idle-up system |
| 64 | Vacuum line control valve or circuit |
| 65 | Float chamber vent control valve circuit |
| 71 | Ignition pulse system |
| 73 | Ignition pulse system |
| 74 | Ignition pulse system |
| 84 - 86 Fuel Injected models | |
| 11 | Ignition pulse |
| 12 | Starter switch off |
| 13 | Starter switch on |
| 14 | Airflow meter or circuit |
| 15 | Atmospheric pressure switch - fixed value |
| 16 | Crank angle sensor or circuit |
| 17 | Starter switch or circuit |
| 21 | Seized airflow meter flap |
| 22 | Pressure or vacuum switches - fixed value |
| 23 | Idle switch - fixed value |
| 24 | Wide open throttle switch - fixed value |
| 25 | Throttle sensor idle switch or circuit |
| 31 | Speed sensor or circuit |
| 32 | Oxygen sensor or circuit |
| 33 | Coolant sensor or circuit |
| 34 | Abnormal aspirated air thermosensor |
| 35 | Air flow meter/EGR solenoid switch or circuit |
| 41 | Atmospheric pressure sensor or circuit |
| 42 | Fuel injector - fixed value |
| 43 | KDLH control system |
| 46 | Neutral or parking switch or circuit |
| 47 | Fuel injector |
| 53 | Fuel pump or circuit |
| 55 | KDLH control system |
| 57 | Canister control system |
| 58 | Air control system |
| 62 | EGR control system |
| 88 | TBI control unit |
| 87 Fuel Injected models | |
| 11 | Ignition pulse/crank angle sensor |
| 12 | Starter switch or circuit |
| 13 | Crank angle sensor or circuit |
| 14 | Injectors 1 and 2 |
| 15 | Injectors 3 and 4 |
| 21 | Coolant temperature sensor or circuit |
| 22 | Knock sensor or circuit |
| 23 | Air flow meter or circuit |
| 24 | Air control |
| 31 | Throttle sensor or circuit |
| 32 | Oxygen sensor or circuit |
| 33 | Vehicle Speed Sensor (VSS) or circuit |
| 34 | EGR solenoid valve stuck on or off |
| 35 | Purge control solenoid or circuit |
| 41 | Lean fuel mixture indicated |
| 42 | Idle switch or circuit |
| 45 | Kick-down relay or circuit |
| 51 | Neutral switch or curcuit |
| 61 | Parking switch or circuit |
| 88 and later models with Single-Point Fuel Injection | |
| 11 | Crank angle sensor or circuit |
| 12 | Starter switch or circuit |
| 13 | Crank angle sensor or circuit |
| 14 | Fuel injector - abnormal output |
| 21 | Coolant temperature or circuit |
| 23 | Air flow meter or circuit |
| 24 | Air control valve or circuit |
| 31 | Throttle sensor or circuit |
| 32 | Oxygen sensor or circuit |
| 33 | Vehicle Speed Sensor or circuit |
| 34 | EGR solenoid or circuit |
| 35 | Purge control solenoid or circuit |
| 42 | Idle switch or circuit |
| 45 | Kick-down control relay or circuit |
| 51 | Neutral switch continuously in the on position |
| 55 | EGR temperature sensor or circuit |
| 61 | Parking switch or circuit |
| 1988 and later models with Multi-Point Fuel Injection (including Legacy) | |
| 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); Fuel injector 1 and 2 (XT, Loyale, GL, DL) |
| 15 | Fuel injector no. 2 (Legacy, Impreza, Justy, SVX); Fuel injector 3 and 4 (Loyale, GL, DL); Fuel injector 5 and 6 (XT6) |
| 16 | Fuel injector no. 3 (Legacy, Impreza, Justy, SVX); Fuel injector 3 and 4 (XT) |
| 17 | Fuel injector no. 4 (Legacy, Impreza, SVX); Fuel injector 1 and 2 (XT6) |
| 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); Pressure sensor (Justy) |
| 24 | Air control valve or circuit (exc. Justy); Idle speed control solenoid valve (Justy) |
| 25 | Fuel Injector 3 and 4 (XT6) |
| 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 valve |
| 35 | Canister purge solenoid or circuit |
| 36 | Air suction solenoid valve (Impreza); Igniter circuit (Justy) |
| 37 | Oxygen sensor (no. 2, left side , SVX) |
| 38 | Engine torque control (SVX) |
| 41 | Air/fuel adaptive control |
| 42 | Idle switch or circuit |
| 43 | Throttle switch (Justy) |
| 44 | Wastegate duty solenoid (turbo) |
| 45 | Pressure duty solenoid (turbo)/atmospheric pressure sensor circuit (non-turbo) |
| 49 | Airflow sensor |
| 51 | Neutral switch (manual transmission)/inhibitor switch (automatic transmission) |
| 52 | Parking brake switch (exc. Justy)/Clutch switch (Justy) |
| 55 | EGR temperature sensor |
| 56 | EGR system |
| 61 | Parking brake switch (Loyale)/Fuel tank pressure control solenoid valve (Impreza) |
| 62 | Fuel temperature sensor (Impreza)/Electric load signal (Justy) |
| 63 | Fuel tank pressure sensor (Impreza)/Blower fan switch (Justy) |
| 65 | Vacuum pressure sensor |
| Subaru OBD2 Codes | |
| P0031 | Front oxygen (A/F) sensor heater circuit low input |
| P0032 | Front oxygen (A/F) sensor heater circuit high input |
| P0037 | Rear oxygen sensor heater circuit malfunction |
| P0038 | Rear oxygen sensor heater circuit high input |
| P0065 | Air assist injector solenoid valve malfunction |
| P0066 | Air assist injector solenoid valve circuit low input |
| P0067 | Air assist injector solenoid valve circuit high input |
| P0100 | Mass Air Flow Sensor Circuit Malfunction |
| P0101 | Mass Air Flow Sensor Circuit Range Problem |
| P0102 | Mass Air Flow Sensor Circuit Low Input |
| PO103 | Mass Air Flow Sensor Circuit High Input |
| P0105 | Pressure Sensor Circuit Malfunction |
| P0106 | Pressure Sensor Circuit Range Problem |
| PO107 | Pressure Sensor Circuit Low Input |
| PO108 | Pressure Sensor Circuit High Input |
| P0111 | Intake air temperature sensor circuit range/performance problem |
| P0112 | Intake air temperature sensor circuit low input |
| P0113 | Intake air temperature sensor circuit high input |
| P0115 | Engine Coolant Temperature Sensor Circuit |
| P0116 | Engine Coolant Temp Sensor Circuit Low Input |
| PO117 | Engine Coolant Temp Sensor Circuit Low Input |
| PO118 | Engine Coolant Temp Sensor Circuit High Input |
| P0120 | Throttle Position Sensor Circuit Malfunction |
| P0121 | Throttle Position Sensor Circuit Range Problem |
| PO122 | Throttle Position Sensor Circuit Range Problem |
| PO123 | Throttle Position Sensor Circuit High Input |
| P0125 | Insufficient Coolant Temperature for Closed Loop |
| P0128 | Thermostat malfunction |
| P0130 | Front Oxygen Sensor Circuit Malfunction |
| P0131 | Front oxygen (A/F) sensor circuit range/performance problem (low input) |
| P0132 | Front oxygen (A/F) sensor circuit range/performance problem (high input) |
| P0133 | Front Oxygen Sensor Circuit Slow Response |
| P0135 | Front Oxygen Sensor Heater Circuit Malfunction |
| P0136 | Rear Oxygen Sensor Circuit Malfunction |
| P0139 | Rear Oxygen Sensor Circuit Slow Response |
| P0141 | Rear Oxygen Sensor Heater Circuit Malfunction |
| P0170 | Fuel Trim Malfunction |
| P0171 | Fuel trim malfunction (A/F too lean) |
| P0172 | Fuel trim malfunction (A/F too rich) |
| PO181 | Fuel Temperature Sensor A Range Problem |
| PO182 | Fuel Temperature Sensor A Circuit Low Input |
| PO183 | Fuel Temperature Sensor A Circuit High Input |
| P0201 | Fuel Injector Circuit Malfunction - #1 |
| P0202 | Fuel Injector Circuit Malfunction - #2 |
| P0203 | Fuel Injector Circuit Malfunction - #3 |
| P0204 | Fuel Injector Circuit Malfunction - #4 |
| P0244 | Wastegate control solenoid valve malfunction (high input) |
| P0245 | Wastegate control solenoid valve circuit low input |
| P0246 | Wastegate control solenoid valve circuit high input |
| PO261 | Fuel Injector Circuit Low Input - #1 |
| PO262 | Fuel Injector Circuit High Input - #1 |
| PO264 | Fuel Injector Circuit Low Input - #2 |
| PO265 | Fuel Injector Circuit High Input - #2 |
| PO267 | Fuel Injector Circuit Low Input - #3 |
| PO268 | Fuel Injector Circuit High Input - #3 |
| PO270 | Fuel Injector Circuit Low Input - #4 |
| PO271 | Fuel Injector Circuit High Input - #4 |
| P0301 | Cylinder 1 Misfire Detected |
| P0302 | Cylinder 2 Misfire Detected |
| P0303 | Cylinder 3 Misfire Detected |
| P0304 | Cylinder 4 Misfire Detected |
| P0325 | Knock Sensor Circuit Malfunction |
| P0327 | Knock sensor circuit low input |
| P0328 | Knock sensor circuit high input |
| P0335 | Crankshaft Position Sensor Circuit Malfunction |
| PO336 | Crankshaft Position Sensor Circuit Range Problem |
| P0340 | Camshaft Position Sensor Circuit Malfunction |
| PO341 | Camshaft Position Sensor Circuit Range Problem |
| P0400 | Exhaust Gas Recirculation Flow Malfunction |
| P0403 | Exhaust Gas Recirculation Circuit Malfunction |
| PO420 | Catalyst System Efficiency Below Threshold |
| PO440 | Evaporative Emission Control System Malfunction |
| P0441 | Evap System Incorrect Purge Flow |
| P0442 | Evaporative emission control system malfunction |
| P0443 | Evap System Purge Control Valve Circuit |
| PO443 | EVAP System Purge Control Valve Circuit Low Input |
| P0444 | Evaporative emission control system purge control valve circuit low input |
| P0445 | Evaporative emission control system purge control valve circuit high input |
| PO446 | EVAP System Vent Control Low Input |
| P0447 | Evaporative emission control system vent control low input |
| P0448 | Evaporative emission control system vent control high input |
| PO451 | EVAP Pressure Sensor Range Problem |
| PO452 | EVAP Pressure Sensor Low Input |
| PO453 | EVAP Pressure Sensor High Input |
| P0456 | Evaporative emission control system malfunction |
| PO461 | Fuel Level Sensor Circuit Range/Performance Problem |
| PO462 | Fuel Level Sensor Circuit Low Input |
| PO463 | Fuel Level Sensor Circuit High Input |
| P0464 | Fuel level sensor intermittent input |
| P0480 | Cooling Fan Relay 1 Circuit Low Input |
| P0483 | Cooling Fan Function Problem |
| P0500 | Vehicle Speed Sensor Malfunction |
| P0505 | Idle Control System Malfunction |
| P0506 | Idle Control System RPM Lower Than Expected |
| P0507 | Idle Control System RPM Higher Than Expected |
| P0509 | Idle control system circuit high input |
| P0512 | Starter switch circuit high input |
| P0545 | Exhaust gas temperature sensor circuit low input |
| P0546 | Exhaust gas temperature sensor circuit high input |
| P0600 | Serial Communication Link Malfunction |
| P0601 | Internal Control Module Memory Checksum Error |
| P0604 | Internal control module memory check sum error |
| P0703 | Brake Switch Input Malfunction |
| P0705 | Transmission Range Sensor Circuit Malfunction |
| P0710 | Transmission Fluid Temperature Sensor Circuit |
| P0715 | Torque Converter Turbine Speed Sensor Circuit Malfunction |
| P0720 | Output Speed Sensor Circuit Malfunction |
| P0725 | Engine Speed Input Circuit Malfunction |
| P0731 | Gear 1 Incorrect Ratio |
| P0732 | Gear 2 Incorrect Ratio |
| P0733 | Gear 3 Incorrect Ratio |
| P0734 | Gear 4 Incorrect Ratio |
| P0740 | Torque Converter Clutch System Malfunction |
| P0741 | Torque converter clutch system malfunction |
| P0743 | Torque Converter Clutch System Electrical |
| P0748 | Pressure Control Solenoid Electrical |
| P0753 | Shift Solenoid A Electrical |
| P0758 | Shift Solenoid B Electrical |
| P0760 | Shift Solenoid C Malfunction |
| P0763 | Shift Solenoid C Electrical |
| P0778 | 2-4 brake pressure control solenoid valve (2-4 brake duty solenoid) circuit malfunction |
| P0785 | 2-4 brake timing control solenoid valve (2-4 brake timing solenoid) circuit malfunction |
| P1086 | Tumble generator valve #2 (LH) position sensor circuit low input |
| P1087 | Tumble generator valve #2 (LH) position sensor circuit high input |
| P1088 | Tumble generator valve #1 (RH) position sensor circuit low input |
| P1089 | Tumble generator valve #1 (RH) position sensor circuit high input |
| P1090 | Tumble generator valve #1 (RH) malfunction (stuck open) |
| P1091 | Tumble generator valve #1 (RH) malfunction (stuck close) |
| P1092 | Tumble generator valve #2 (LH) malfunction (stuck open) |
| P1093 | Tumble generator valve #2 (LH) malfunction (stuck close) |
| P1094 | Tumble generator valve circuit #1 (open circuit) |
| P1095 | Tumble generator valve circuit #1 (over current) |
| P1096 | Tumble generator valve circuit #2 (open circuit) |
| P1097 | Tumble generator valve circuit #2 (over current) |
| P1100 | Starter Switch Circuit Malfunction |
| P1101 | Neutral Position Switch Circuit High Input (A/T) |
| P1101 | Neutral Position Switch Circuit Malfunction (M/T) |
| P1102 | Pressure Sources Solenoid Valve Circuit Malfunction |
| P1103 | Pressure Sources Switching Solenoid Valve Circuit |
| P1104 | Engine Torque Control Signal Circuit Malfunction |
| P1106 | Engine Torque Control Signal 2 Circuit Malfunction |
| P1110 | Atmospheric pressure sensor low input |
| P1111 | Atmospheric pressure sensor high input |
| P1112 | Atmospheric pressure sensor range/performance problem |
| P1115 | Engine Torque Control Cut Signal Circuit High Input |
| P1116 | Engine Torque Control Cut Signal Circuit Low Input |
| P1120 | Starter Switch High Input |
| P1121 | Neutral Position Switch Circuit High Input [MT Vehicles] |
| P1121 | Neutral Position Switch Circuit Low Input [AT Vehicles] |
| P1122 | Pressure Sources Switching Valve Circuit High Input |
| P1124 | TCS Signal Circuit High Input |
| P1130 | Front oxygen sensor circuit malfunction (open circuit) |
| P1131 | Front oxygen sensor circuit malfunction (short circuit) |
| P1134 | Front oxygen (A/F) sensor microcomputer problem |
| P1137 | Front oxygen (A/F) sensor circuit range/performance problem |
| P1139 | Front oxygen (A/F) sensor #1 heater circuit performance/range problem |
| P1141 | Mass Air Flow Sensor Circuit High Input |
| P1142 | Mass Air Flow Sensor Circuit Low Input |
| P1143 | Pressure Sensor Circuit Low Input |
| P1144 | Pressure Sensor Circuit High Input |
| P1146 | Pressure sensor circuit range/performance problem (high input) |
| P1150 | Front Oxygen Sensor Heater Circuit High Input |
| P1151 | Rear Oxygen Sensor Heater Circuit High Input |
| P1230 | Fuel pump control unit malfunction |
| P1244 | Wastegate control solenoid valve malfunction (low input) |
| P1245 | Wastegate control solenoid valve malfunction (fail-safe) |
| P1301 | Fire due to increased exhaust temperature |
| P1312 | Exhaust temperature sensor malfunction |
| P1325 | Knock Sensor Circuit Low Input |
| P1400 | Fuel Tank Pressure Control Solenoid Low Input |
| P1420 | Fuel Tank Pressure Control Solenoid High Input |
| P1421 | Exhaust Gas Recirculation Circuit High Input |
| P1422 | EVAP Purge Control Valve Circuit High Input |
| P1423 | EVAP Vent Control High Input |
| P1440 | Fuel Tank Pressure Control System Low Input |
| P1441 | Fuel Tank Pressure Control System High Input |
| P1442 | Fuel Level Sensor Circuit Range/Perf |
| P1443 | EVAP Control System Vent Control Function Problem |
| P1480 | Cooling fan relay 1 circuit high input |
| P1500 | Radiator Fan Relay 1 Circuit Malfunction |
| P1501 | Idle Control System Malfunction (Fail Safe) |
| P1502 | Radiator Fan Function Problem |
| P1507 | Idle Control System Malfunction (Fail Safe) |
| P1510 | Idle Air Control Solenoid Signal 1 Circuit Low Input |
| P1511 | Idle Air Control Solenoid Signal 1 Circuit High Input |
| P1512 | Idle Air Control Solenoid Signal 2 Circuit Low Input |
| P1513 | Idle Air Control Solenoid Signal 2 Circuit High Input |
| P1514 | Idle Air Control Solenoid Signal 3 Circuit Low Input |
| P1515 | Idle Air Control Solenoid Signal 3 Circuit High Input |
| P1516 | Idle Air Control Solenoid Signal 4 Circuit Low Input |
| P1517 | Idle Air Control Solenoid Signal 4 Circuit High Input |
| P1518 | Starter switch circuit low input |
| P1520 | Radiator Fan Relay 1 Circuit High Input |
| P1540 | Vehicle Speed Sensor Malfunction 2 |
| P1544 | High exhaust temperature detected |
| P1560 | Back-Up Voltage Circuit Malfunction |
| P1590 | Neutral position switch circuit high input |
| P1591 | Neutral position switch circuit low input |
| P1592 | Neutral position switch circuit (MT model) |
| P1594 | Automatic transmission diagnosis input signal circuit malfunction |
| P1595 | Automatic transmission diagnosis input signal circuit low input |
| P1596 | Automatic transmission diagnosis input signal circuit high input |
| P1698 | Engine torque control cut signal circuit low input |
| P1699 | Engine torque control cut signal circuit high input |
| P1700 | Throttle Position Sensor Circuit Malfunction (A/T) |
| P1701 | Cruise Control Set Signal Circuit Malfunction (A/T) |
| P1702 | Auto Trans Diagnosis Input Signal Circuit |
| P1703 | Low clutch timing control solenoid valve circuit malfunction |
| P1704 | 2-4 Brake Timing Solenoid Valve Circuit Malfunction |
| P1705 | 2-4 Brake Pressure Solenoid Valve (Solenoid D) Circuit |
| P1711 | Engine torque control signal 1 circuit malfunction |
| P1712 | Engine torque control signal 2 circuit malfunction |
| P1722 | Auto Trans Diagnosis Input Signal High Input |
| P1742 | Auto Trans Diagnosis Input Signal Malfunction |
