[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
13 -FUEL > 13A-DIRECT INJECTION AND MULTIPOINT FUEL INJECTION (DI AND MPI) > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > CODE NO. P1238 AIR FLOW SENSOR TRUSTFUL FOR TORQUE MONITORING
Code No. P1238: Air Flow Sensor Trustful For Torque Monitoring
 
 
 
 
FUNCTION
  • Compare the actual measurement of volumetric efficiency by an air flow sensor signal with volumetric efficiency estimated from a throttle position sensor (main and sub) signal.
 
 
TROUBLE JUDGEMENT
Check Conditions
  • While engine is running.
  • Throttle position sensors (main and sub) are normal.
Judgement Criterion
  • Difference between the actual volumetric efficiency and the volumetric efficiency estimated by the throttle position sensor (main) is more than a predetermined value.
  • Difference between the actual volumetric efficiency and the volumetric efficiency estimated by the throttle position sensor (sub) is more than a predetermined value.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Throttle opening degree position is in default position.
 
 
PROBABLE CAUSES
  • Failed air flow sensor
  • Harness damage in air flow sensor circuit or loose connector contact
  • Failed engine-ECU
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE diagnosis code
Is any other diagnosis code than P1238 set?
Inspection chart for diagnosis code (Refer to ).
Go to Step 2.
 
STEP 2. M.U.T.-IIISE data list
  • Data list reference table (Refer to ).
    1. Item 10: Air flow sensor
Is the check result normal?
Replace the engine-ECU.
Check air flow sensor system. Check code No. P0102: air flow sensor circuit low input (Refer to ). Check code No. P0103: air flow sensor circuit high input (Refer to ).