[ 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. P0098 NO. 2 INTAKE AIR TEMPERATURE SENSOR CIRCUIT HIGH INPUT
Code No. P0098: No. 2 Intake Air Temperature Sensor Circuit High Input
 
 
 
 
OPERATION
  • A power voltage of 5 V is applied to the No. 2 intake air temperature sensor power terminal of boost pressure sensor from the engine-ECU connector terminal UATS.
  • The power voltage is earthed to the engine-ECU connector terminal E from the No. 2 intake air temperature sensor.
 
 
FUNCTION
  • The No. 2 intake air temperature sensor converts the intake air temperature into a voltage and inputs the voltage signal to the engine-ECU.
  • In response to the signal, the engine-ECU corrects the fuel injection amount, etc.
  • The No. 2 intake air temperature sensor is a kind of resistor, which has characteristics to reduce its resistance as the intake air temperature rises. Therefore, the sensor output voltage varies with the intake air temperature, and becomes lower as the intake air temperature rises.
 
 
TROUBLE JUDGEMENT
Check Condition
  • Ignition switch is "ON" position.
Judgement Criterion
  • No. 2 intake air temperature sensor output voltage is more than 4.6 V (corresponding to an intake air temperature of -40°C or less) for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Using the intake air temperature measured by the No. 1 intake air temperature sensor, carry out the control.
  • Control as if the intake air temperature is 25°C if No. 1 intake air temperature sensor fails.
 
 
PROBABLE CAUSES
  • Failed No. 2 intake air temperature sensor
  • Open circuit or harness damage in No. 2 intake air temperature 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 DE: No. 2 intake air temperature 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. Check No. 2 intake air temperature sensor itself.
  • No. 2 intake air temperature sensor check (Refer to ).
Is the check result normal?
Go to Step 3.
Replace the boost pressure sensor.
 
STEP 3. Perform voltage measurement at boost pressure sensor connector.
  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal engine-ECU UATS line and body earth.
OK: 4.5 - 4.9 V
Is the check result normal?
Go to Step 6.
Go to Step 4.
 
STEP 4. Check of open circuit in UATS line between boost pressure sensor connector and engine-ECU connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. M.U.T.-IIISE data list
  • Data list reference table (Refer to ).
    1. Item DE: No. 2 intake air temperature 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 6. Perform resistance measurement at boost pressure sensor connector.
  • Disconnect connector, and measure at harness side.
  • Resistance between terminal engine-ECU E line and body earth.
OK: Continuity (2 Ω or less)
Is the check result normal?
Go to Step 8.
Go to Step 7.
 
STEP 7. Check of open circuit, and damage in E line between boost pressure sensor connector and engine-ECU connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 8. Check of damage in UATS line between boost pressure sensor connector and engine-ECU connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.