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Home >> Volvo >> 2000 >> V70 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Turbo >> Diagnostic Tests >> P1652/ECM-982A: Control Module, Internal Fault >> Diagnostic Procedure
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Diagnostic Procedure

  1. Checking components, intake system Check the hoses and hose connectors for the intake system between the Mass Air Flow (MAF) sensor and the Electronic Throttle Module (ETM). Check for leakage.
  2. Check that the Intake Air Temperature (IAT) sensor and boost pressure sensor are correctly installed. Check for air leakage around the components.
    NOTE: Even extremely small air leaks can cause this DTC) to be stored.
  3. Check the crankcase ventilation for blockage. In particular check the Positive Crankcase Ventilation (PCV) valve on turbocharged engines. Indications of a blocked PCV valve include contamination or oil on components in the intake system. If the PCV valve/crankcase ventilation is blocked, check the electronic throttle unit shutter for dirt. Remedy as necessary.
  4. After carrying out the repair, check that the fault has been remedied. Turn ignition off. Reinstall the connectors, components etc. Turn ignition on. Read off and make a note of the adaptation value. Start the engine. Increase the RPM a couple of times. Read off the adaptation value and check that the adaptation value approaches 1. If value is within specification, diagnosis is complete. If not, go to next step.
  5. Replace ECM with a known good unit. See REMOVAL, OVERHAUL & INSTALLATION - EXCEPT S40 & V40 article.
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