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Home >> Subaru >> 2017 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics - Introduction) (2.5L) >> Drive Cycle >> Procedure >> Drive Cycle G
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Drive Cycle G

DTC Item Condition
P0410 Air System -
P0411 Secondary Air System Incorrect Flow Detected -
P0414 Secondary Air System Switching Valve "A" Circuit Shorted -
P0417 Secondary Air System Switching Valve "B" Circuit Shorted -
P1410 Secondary Air Injection System Combination Valve Stuck Open -
P2258 Secondary Air System Control "A" Circuit High -
P2440 Secondary Air System Switching Valve Stuck Open Bank 1 -
P2441 Secondary Air System Switching Valve Stuck Closed Bank 1 -
P2442 Secondary Air System Switching Valve Stuck Open Bank 2 -
P2443 Secondary Air System Switching Valve Stuck Closed Bank 2 -

Diagnostic procedure: 

  1. Disconnect the battery negative terminal, and reconnect after at least 10 seconds have passed.
  2. Idle the engine until engine coolant temperature is 80°C (176°F) more.
  3. Stop the engine to decrease the engine coolant temperature down to 40°C (104°F) or less.
    NOTE: Do not let engine coolant temperature drop to 5°C (41°F) or less.
  4. Idle the engine until engine coolant temperature is 80°C (176°F) more.
  5. Stop the engine to decrease the engine coolant temperature down to 40°C (104°F) or less.
    NOTE: Do not let engine coolant temperature drop to 5°C (41°F) or less.
  6. Idle the engine.
  7. Read the temporary code using the Subaru Select Monitor or general scan tool. <Ref. to OPERATION , Read Diagnostic Trouble Code (DTC).>