[ 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. P0237 BOOST PRESSURE SENSOR CIRCUIT LOW INPUT
Code No. P0237: Boost Pressure Sensor Circuit Low Input
 
 
 
 
OPERATION
  • A power voltage of 5 V is applied to the boost pressure sensor power terminal from the engine-ECU connector terminal UPS5 and earthed to the engine-ECU connector terminal E from the boost pressure sensor earth terminal.
  • The sensor signal is inputted to the engine-ECU connector terminal UPS from the boost pressure sensor output terminal.
 
 
FUNCTION
  • The boost pressure sensor detects a change in supercharging pressure and inputs the signal to the engine-ECU.
 
 
TROUBLE JUDGEMENT
Check Conditions
  • More than 2 seconds have passed since the engine starting sequence was completed.
  • Engine coolant temperature sensor is normal.
Judgement Criterion
  • Boost pressure sensor output voltage is less than 0.2 V for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Supercharging pressure is restricted.
 
 
PROBABLE CAUSES
  • Failed boost pressure sensor
  • Open/short circuit or harness damage in boost pressure 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 125: Boost pressure sensor 1
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 voltage measurement at boost pressure sensor connector.
  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal engine-ECU UPS5 line and body earth.
OK: 4.9 - 5.1 V
Is the check result normal?
Go to Step 5.
Go to Step 3.
 
STEP 3. Check of open circuit, and short circuit in UPS5 line between boost pressure 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 125: Boost pressure sensor 1
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. Check of damage in UPS5 line between boost pressure sensor connector and engine-ECU connector.
Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.
 
STEP 6. Perform voltage measurement at boost pressure sensor connector.
  • Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
  • Ignition switch: ON
  • Voltage between terminal engine-ECU UPS line and body earth.
  • Altitude 0 m: 3.8 - 4.2 V
  • Altitude 600 m: 3.5 - 3.9 V
  • Altitude 1,200 m: 3.3 - 3.7 V
  • Altitude 1,800 m: 3.0 - 3.4 V
Is the check result normal?
Go to Step 8.
Go to Step 7.
 
STEP 7. Check of short to earth in UPS line between boost pressure sensor connector and engine-ECU connector.
Is the check result normal?
Replace the boost pressure sensor.
Repair the connector(s) or wiring harness.
 
STEP 8. Check of open circuit, and damage in UPS line between boost pressure sensor connector and engine-ECU connector.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.