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Home >> Volvo >> 2000 >> S70 GLT >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Turbo >> Diagnostic Tests >> P0236/ECM-170F: Atmospheric Pressure Sensor/Boost Pressure Sensor Range Check >> Diagnostic Procedure

Diagnostic Procedure

  1. Ignition OFF. Check boost pressure sensor connector for contact resistance and oxidation. See CHECKING WIRING & CONNECTIONS .
  2. Connect electrical connectors. Ignition ON. Read boost pressure and atmospheric pressure using a scan tool. Difference in pressure should not be greater than 2.0 psi (140 hPa). If difference is less than 2.0 psi (140 hPa) , cause of fault was poor connections. If fault remains, go to next step.
    NOTE: Normal atmospheric pressure is 14.7 psi (1013 hPa).
  3. Replace boost pressure sensor with a known good unit. See Figure.
  4. Turn ignition on. Read out boost pressure and atmospheric pressure using a scan tool. Difference in pressure should not be greater than 2.0 psi (140 hPa). If difference is less than 2.0 psi (140 hPa) , cause of fault was a defective sensor. If fault remains, go to next step.
  5. Atmospheric pressure sensor is built into ECM. Replace ECM to test whether atmospheric pressure sensor is faulty. See REMOVAL, OVERHAUL & INSTALLATION - EXCEPT S40 & V40 article.
  6. Turn ignition on. Read out boost pressure and atmospheric pressure using a scan tool. Difference in pressure should not be greater than 2.0 psi (140 hPa). If difference is less than 2.0 psi (140 hPa), cause of fault was a defective sensor.
  7. Verify repair. Ignition OFF. Ensure all sensors are installed and electrical connections assembled. Ignition ON. Read out boost pressure and atmospheric pressure using a scan tool. Difference in pressure should not be greater than 2.0 psi (140 hPa). If difference is less than 2.0 psi (140 hPa), fault has not been repaired. Repeat procedure as necessary to find fault.
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