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Volvo engine code DTC P2578
Turbocharger Speed Sensor (TSS): Rationality Monitor This OBD monitor evaluates the turbo speed sensor for missing signal and for rationality faults. The turbo speed is compared during two working conditions, one when the turbo speed is supposed to be low and another when the turbo speed is supposed to be high. Low Flow Condition : When the engine is in idle or in low engine speed and torque condition, the expected Turbo Speed is expected to be low. If the turbo speed exceeds a calibrated threshold, a low speed error is set. High Flow Condition : When the engine is in higher engine speed and torque condition, the expected Turbo Speed is expected to be high. If the turbo speed lies below a calibrated threshold, a high speed error is set. P2578 Turbocharger Speed Sensor (TSS): Missing Signal Monitor DTC P2578 Component / System TSS - Missing Signal Monitor Strategy Description Missing signal Fault Limit Average turbo speed ≤ 0 RPM Enable Conditions • Engine Speed 500 - 2000 RPM • Engine Torque > 200 Nm Disable Conditions No Active DTC's: • P2581 Time Required For DTC To Be Set 5 seconds MIL Illumination 2 Drive Cycles