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DTC P0403 (ERGSOL) EGR CIRCUIT MALFUNCTION Subaru Outback BG

Testing & Diagnostics ~350 words
  1. Turn ignition on. Using DVOM connected to chassis ground, backprobe ECM harness connector terminal No. 71. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-26255) article. If voltage is 10 volts or greater, go to next step. If voltage is less than 10 volts, go to step 4).
  2. Turn ignition off. Disconnect EGR solenoid valve harness connector. Turn ignition on. Backprobe ECM harness connector terminal 71. If voltage is 10 volts or greater, check for short in harness. If circuit is okay, replace ECM. If voltage is less than 10 volts, go to next step.
  3. Turn ignition off. Check resistance between EGR solenoid valve harness connector terminals No. 1 and No. 2. If resistance is one ohm or less, replace EGR solenoid valve and ECM. If resistance is greater than one ohm, check for poor connection in ECM connector. Repair as necessary. If connection is good, replace ECM.
  4. Turn ignition off. Disconnect EGR solenoid valve and ECM harness connectors. Check resistance between EGR solenoid valve harness connector terminal No. 2 and chassis ground. If resistance is greater than 10 ohms, repair short in harness between ECM and EGR solenoid valve harness connector. If resistance is 10 ohms or less, go to next step.
  5. Disconnect ECM harness connector. Check resistance of harness between ECM harness connector terminal No. 71 and EGR solenoid valve harness connector terminal No. 2. If resistance is one ohm or less, go to next step. If resistance is greater than one ohm, repair open in harness between ECM and EGR solenoid valve harness connector.
  6. Check resistance between EGR solenoid valve terminals. If resistance is 10-100 ohms, go to next step. If resistance is less than 10 or greater than 100 ohms, replace EGR solenoid valve.
  7. Reconnect ECM harness connector. Turn ignition on. Check voltage between EGR solenoid valve harness connector terminal No. 1 and chassis ground. If voltage reading is 10 volts or greater, confirm a good connection at EGR solenoid connector. If voltage is less than 10 volts, repair open circuit in harness between main relay and EGR solenoid valve harness connector.

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