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Home >> Subaru >> 2017 >> Impreza Base, 4D Sedan, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics - Introduction) >> Inspection Mode >> Procedure >> Inspection Mode H >> Diagnostic procedure

Diagnostic procedure

  1. With the ignition switch ON (engine stopped), read the values in [Engine Coolant Temperature] and [Intake Air Temperature]. Ref. to ENGINE (DIAGNOSTICS) >Data Monitor .
  2. If the values from step 1) satisfy the following conditions, idle the engine for two minutes or more.

    Condition: 

    Engine coolant temperature - Intake air temperature ≤ 5°C (9°F)

    NOTE:
    • If the conditions are not satisfied, turn the ignition switch to OFF and wait until the parameters are satisfied.
    • For CVT models, hold the select lever to "P" range or "N" range at idling, and for MT models, the shift lever in the neutral position at idling.
  3. Read the temporary code using the Subaru Select Monitor or general scan tool.
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