LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2021 >> Sequoia TRD Pro >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (3UR-FE) - Diagnostic Codes (5 Of 9) >> SFI System >> DTC P144C: Open in Secondary Air Injection System Heater Control Circuit; DTC P144D: Short in Secondary Air Injection System Heater Control Circuit [08/2017 - 08/2019] >> Monitor Strategy
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Monitor Strategy

Related DTCs P144C: Air pump heater relay circuit range check (Low voltage)
P144D: Air pump heater relay circuit range check (High voltage)
Required Sensors/Components (Main) Air pump heater relay
Required Sensors/Components (Related) -
Frequency of operation Continuous
Duration 5 seconds
MIL operation Immediate
Sequence of Operation None