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Home >> Toyota >> 2017 >> 4Runner TRD Pro >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (P0560-P2121) >> SFI System >> DTC P144C: Open in Secondary Air Injection System Heater Control Circuit; DTC P144D: Short in Secondary Air Injection System Heater Control Circuit [08/2015 - 08/2019] >> Typical Enabling Conditions
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Typical Enabling Conditions

P144C

Monitor runs whenever following DTCs not stored None
Current air pump heater relay (AIR PUMP HTR) state OFF
Last air pump heater relay (AIR PUMP HTR) state OFF
Battery voltage 8 V or higher
Ignition switch ON
Starter OFF
P144D

Monitor runs whenever following DTCs not stored None
Current air pump heater relay (AIR PUMP HTR) state ON
Last air pump heater relay (AIR PUMP HTR) state ON
Battery voltage 8 V or higher
Ignition switch ON
Starter OFF
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