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Home >> Subaru >> 2019 >> Ascent Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics - Introduction) >> Inspection Mode >> Procedure >> Inspection Mode A
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Inspection Mode A

DTC Item Condition Number of driving cycles on the detecting condition
P0030 A/F/O2 HEATER CONTROL CIRCUIT BANK 1 SENSOR 1 - 2
P0087 FUEL RAIL/SYSTEM PRESSURE - TOO LOW BANK 1 Complete diagnosis with inspection mode B as well. 1
P0088 FUEL RAIL/SYSTEM PRESSURE - TOO HIGH BANK 1 Complete diagnosis with inspection mode B as well. 1
P0128 COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE) - 2
P013A O2 SENSOR SLOW RESPONSE - RICH TO LEAN BANK 1 SENSOR 2 - 2
P013E O2 SENSOR DELAYED RESPONSE - RICH TO LEAN BANK 1 SENSOR 2 - 2
P0141 O2 SENSOR HEATER CIRCUIT BANK 1 SENSOR 2 - 2
P014C A/F/O2 SENSOR SLOW RESPONSE - RICH TO LEAN BANK 1 SENSOR 1 - 2
P014D A/F/O2 SENSOR SLOW RESPONSE - LEAN TO RICH BANK 1 SENSOR 1 - 2
P015A A/F/O2 SENSOR DELAYED RESPONSE - RICH TO LEAN BANK 1 SENSOR 1 - 2
P015B A/F/O2 SENSOR DELAYED RESPONSE - LEAN TO RICH BANK 1 SENSOR 1 - 2
P0171 SYSTEM TOO LEAN BANK 1 Complete diagnosis with inspection mode B as well. 2
P0172 SYSTEM TOO RICH BANK 1 Complete diagnosis with inspection mode B as well. 2
P0300 RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED Complete diagnosis with inspection mode B as well. 2
P0301 CYLINDER 1 MISFIRE DETECTED Complete diagnosis with inspection mode B as well. 2
P0302 CYLINDER 2 MISFIRE DETECTED Complete diagnosis with inspection mode B as well. 2
P0303 CYLINDER 3 MISFIRE DETECTED Complete diagnosis with inspection mode B as well. 2
P0304 CYLINDER 4 MISFIRE DETECTED Complete diagnosis with inspection mode B as well. 2
P0459 EVAP SYSTEM (CPC) PURGE CONTROL VALVE "A" CIRCUIT HIGH - 2
P0562 SYSTEM VOLTAGE LOW - 1
P0563 SYSTEM VOLTAGE HIGH - 1
P2096 POST CATALYST FUEL TRIM SYSTEM TOO LEAN BANK 1 Complete diagnosis with inspection mode B as well. 2
P2097 POST CATALYST FUEL TRIM SYSTEM TOO RICH BANK 1 Complete diagnosis with inspection mode B as well. 2
P2195 A/F/O2 SENSOR SIGNAL BIASED/STUCK LEAN BANK 1 SENSOR 1 - 2
P2196 A/F/O2 SENSOR SIGNAL BIASED/STUCK RICH BANK 1 SENSOR 1 - 2
P2227 BAROMETRIC PRESSURE SENSOR "A" CIRCUIT RANGE/PERFORMANCE - 2
P2270 O2 SENSOR SIGNAL BIASED/STUCK LEAN BANK 1 SENSOR 2 - 2
P2271 O2 SENSOR SIGNAL BIASED/STUCK RICH BANK 1 SENSOR 2 - 2
WARNING: When performing inspection mode A on a public road, pay sufficient attention to the traffic condition and give the highest priority to safe driving.
NOTE: Perform the inspection mode after warming up the engine except that the engine coolant temperature at engine start is specified.
  1. Check that the battery voltage is 12 V or more and fuel remains approx. half [20 - 40 L (5.3 - 10.6 US gal, 4.4 - 8.8 Imp gal)].
  2. Using the Subaru Select Monitor, clear the memory of [Engine Control System]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
  3. Drive for 20 minutes or more at a constant speed of 80 km/h (50 MPH) or more.
  4. Stop the vehicle and idle for one minute.
  5. Read the readiness code of [Engine Control System] using Subaru Select Monitor and check that the concerned self-diagnosis is completed. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>ALL READINESS DIAGNOSTIC CODE(S) .
  6. Read the temporary code using the Subaru Select Monitor or general scan tool. Ref. to COMMON (DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .
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