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 [08/2015 - 08/2017] >> Typical Enabling Conditions
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Typical Enabling Conditions

CASE 1

Monitor runs whenever following DTCs not stored None
Current air pump heater relay (AIR PMP HTR) ON
Last air pump heater relay (AIR PMP HTR) ON
Battery voltage 8 V or more
Ignition switch ON
Starter OFF
CASE 2

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