[ 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. P0103 AIR FLOW SENSOR CIRCUIT HIGH INPUT
Code No. P0103: Air Flow Sensor Circuit High Input
 
 
 
 
OPERATION
  • Power is supplied by the engine control relay to the air flow sensor.
  • Power is supplied by the engine-ECU connector terminal AFS5 to the air flow sensor, and the air flow sensor is earthed through the engine-ECU connector terminal AFSE.
  • The air flow sensor outputs a sensor signal, which is input into the engine-ECU connector terminal AFS.
 
 
FUNCTION
  • The air flow sensor outputs current that varies in accordance with the intake air volume.
  • The engine-ECU uses the amperage output by the air flow sensor and the engine speed signal in order to determine the basic injection duration of the injector.
 
 
TROUBLE JUDGEMENT
Check Condition
  • More than 3 seconds have passed since the ignition switch was turned to "ON" position.
Judgement Criterion
  • Air flow sensor output voltage is more than 4.9 V for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Estimate the throttle opening degree and the amount of intake air given by a normal sensor, and then carry out the fuel control.
  • Supercharging pressure is restricted.
 
 
PROBABLE CAUSES
  • Failed air flow sensor
  • Open circuit or harness damage in air flow sensor circuit or loose connector contact
  • Failed engine-ECU
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE data list
  • Data list reference table (Refer to ).
    1. Item 10: Air flow sensor
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2.
 
STEP 2. Perform resistance measurement at air flow sensor connector.
  • Disconnect connector, and measure at harness side.
  • Resistance between terminal engine-ECU AFSE line and body earth.
OK: Continuity (2 Ω or less)
Is the check result normal?
Go to Step 5.
Go to Step 3.
 
STEP 3. Check of open circuit, and damage in AFSE line between air flow sensor connector and engine-ECU connector.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. M.U.T.-IIISE data list
  • Data list reference table (Refer to ).
    1. Item 10: Air flow sensor
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-ECU.
 
STEP 5. M.U.T.-IIISE data list
  • Data list reference table (Refer to ).
    1. Item 10: Air flow sensor
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 6.
 
STEP 6. Replace the air flow sensor
  • After replacing the air flow sensor, reconfirm whether the diagnosis code is set.
Is the diagnosis code set?
Replace the engine-ECU.
Check end.