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Home >> Toyota >> 2014 >> Prius Four >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes & Circuit Tests) (Except Plug-In) >> SFI System >> DTC P261B: Engine Coolant Pump "B" Control Malfunction; DTC P261C: Engine Coolant Pump "B" Control Circuit Low; DTC P261D: Engine Coolant Pump "B" Control Circuit High [10/2013 - ] >> Typical Enabling Conditions
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Typical Enabling Conditions

ALL

Monitor runs whenever following DTCs are not present None
All of the following conditions are met -
Auxiliary battery voltage 8 V or more
Power switch On (IG)
Time after power switch off to on (IG) More than 0.5 seconds
P261B: ENGINE WATER PUMP CIRCUIT PERFORMANCE

All of the following conditions are met -
Output duty cycle 40% or more
Monitor synchronism monitor status Enable
Engine coolant temperature -10°C (14°F) or more
Engine coolant temperature sensor circuit fail (P0115, P0117, P0118) Not detected
Engine water pump circuit low voltage fail (P261C) Not detected
Engine water pump circuit high voltage fail (P261D) Not detected
P261C AND P261D: ENGINE WATER PUMP CIRCUIT RANGE CHECK (LOW VOLTAGE, HIGH VOLTAGE)

All of the following conditions are met -
Output duty cycle 40 to 60%
Engine water pump circuit performance fail (P261B) Not detected
Engine water pump output terminal voltage monitor counter 0.08 seconds or more