Witte2Performance
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Volvo
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2000
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S70 AWD
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Self-Diagnostics - Turbo
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Diagnostic Tests
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P1651/ECM-981A: Control Module, Internal Fault
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Possible Causes
Possible Causes
Something is blocking throttle position sensor (oil film, dust etc.)
Software in ECM is not up to date
Defective mass air flow sensor
Defective accelerator pedal position sensor
Defective ECM
Defective throttle unit