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Home >> Volvo >> 1998 >> S70 T-5, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> DTC P0243/EFI 242, P0245/EFI 242 & P0246/EFI 242 >> Diagnosis

DTC P0243/EFI 242, P0245/EFI 242 & P0246/EFI 242: Diagnosis

  1. If fault is permanent and signal is too high, go to next step. If fault is permanent and signal is too low, go to step  3. If fault is permanent and signal is missing, go to step  4. If fault is intermittent and signal is too high or low, go to step  8. If fault is intermittent and signal is missing, go to step  9.
  2. If fault is permanent and signal is too high, turn ignition off. Disconnect turbocharger (TC) control valve. Connect DVOM between TC control valve connector terminals No. 1 and 2. If DVOM reads approximately 24 ohms at 68°F (20°C), check for a short circuit to voltage in wiring between TC control valve terminal No. 2 and ECM connector terminal B41. If DVOM does not read approximately 24 ohms at 68°F (20°C), replace TC control valve.
  3. If fault is permanent and signal is too low, check for a short circuit to ground in wiring between TC control valve terminal No. 2 and ECM connector terminal B41. Repair as necessary.
  4. If fault is permanent and signal is missing, turn ignition off. Disconnect TC control valve. Turn ignition on. Measure voltage between TC control valve connector terminal No. 1 and ground. If battery voltage is present, go to next step. If battery voltage is not present, check wiring between TC control valve terminal No. 1 and main relay terminal No. 3 for an open circuit. Repair as necessary.
  5. Measure voltage between TC control valve connector terminal No. 2 and ground. If approximately 6 volts are present, go to next step. If approximately 6 volts are not present, go to step  7.
  6. Turn ignition off. Connect DVOM between TC control valve connector terminals No. 1 and 2. If DVOM reads approximately 24 ohms at 68°F (20°C), cause of DTC was loose connection in TC control valve and/or ECM. Check connectors for poor terminal contact and repair as necessary. If DVOM does not read approximately 24 ohms at 68°F (20°C), replace TC control valve.
  7. Turn ignition off. Disconnect ECM connector and check for poor terminal contact. Repair as necessary. Reconnect ECM connector. Turn ignition on. Measure voltage between TC control valve connector terminal No. 2 and ground. If approximately 6 volts are present, DTC was caused by poor contact at ECM connector. If approximately 6 volts are not present, check wiring between TC control valve terminal No. 2 and ECM terminal B41 for an open circuit. Repair as necessary.
  8. If fault is intermittent and signal is too high, check wiring between TC control valve terminal No. 2 and ECM terminal B41 for an intermittent short circuit to voltage. Repair as necessary. If fault is intermittent and signal is too low, check wiring between TC control valve terminal No. 2 and ECM terminal B41 for an intermittent short circuit to ground.
  9. If fault is intermittent and signal is missing, check TC control valve and/or ECM connector for poor terminal contact. Repair as necessary. If terminal contact is okay, check for an intermittent open circuit in wiring between TC control valve terminal No. 1 and main relay terminal No. 3, and wiring between TC control valve terminal No. 2 and ECM terminal B41. Repair as necessary.
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