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Home >> Volvo >> 1998 >> V70 GLT >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> DTC P0243/EFI 414: Boost Pressure Control >> Diagnosis
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DTC P0243/EFI 414: Boost Pressure Control: Diagnosis

  1. Turn ignition on. Ensure Mass Airflow (MAF) sensor is connected. Using voltmeter, backprobe between MAF sensor connector terminals No. 2 and 4. If voltage is .1-.2 volts, go to step  3. If voltage is not approximately .1-.2 volts, go to next step.
  2. Turn ignition off. Check MAF and ECM connectors for poor terminal contact. Repair as necessary. Reconnect connectors. Turn ignition on. Using voltmeter, backprobe between MAF sensor connector terminals No. 2 and 4. If voltage is .1-.2 volts, DTC was caused by poor terminal contact at MAF and/or ECM connector. If voltage is not .1-.2 volts, replace MAF sensor.
  3. Turn ignition off. Connect test box and check ECM ground connections for good terminal contact. See WIRING DIAGRAMS. Repair as necessary. Disconnect ECM. Turn ignition on. Measure voltage between ground and test box pin No. 42. If battery voltage is present, go to next step. If battery voltage is not present, check wiring for an open circuit.
  4. Turn ignition off. Check Turbocharger (TC) control valve and Engine Control Module (ECM) connectors for poor terminal contact. Repair as necessary. Reconnect TC and ECM connectors. Turn ignition on. Using scan tool, activate TC control valve. If TC control valve operates, go to next step. If TC control valve does not operate, replace TC control valve.
  5. Turn ignition off. Ensure hose between TC and TC control valve, and hose between TC control valve and pressure servo to Boost Pressure Control (BPC) valve is not blocked or pinched. Also ensure TC control valve is not blocked between Red and Yellow connectors. If hoses and TC control valve are okay, go to next step. If hoses and TC control valve are not okay, clean and replace as necessary.
    6. NOTE: To avoid damage to pressure servo diaphragm, ensure push rod is not twisted during adjustment.
  6. Turn ignition off. Disconnect pressure servo hose. Connect Manometer (999 5230) and Pressure Tester (998 5496) to pressure servo. Pump pressure up to approximately 16.7 psi. If pressure servo is not fully open at this pressure, replace pressure servo. If pressure servo is fully open at this pressure, check basic adjustment of push rod. Connect manometer and pressure tester to pressure servo. Pump up pressure to approximately 0.14 psi. Push Boost Pressure Control (BPC) valve spindle toward Turbocharger (TC) housing. Adjust push rod so it fits onto spindle lug exactly. Install lock pin to BPC valve spindle. Tighten push rod lock nut. Remove manometer and pressure tester.
  7. Verification. After carrying out the repair, check that the fault has been remedied as follows. Reconnect connectors and reinstall components. Erase DTCs using scan tool. Test drive the car. Depress the accelerator pedal to the floor a few times. Read off any DTCs. DTC EFI-414 should not be stored.
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