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Home >> Toyota >> 2019 >> Sequoia SR5, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 22 (Engine Control System (3UR-FBE) - Diagnostic Codes (4 Of 6)) >> 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 - 08/2018] >> Monitor Description

Monitor Description

WARNING: This page is about a different car, the 2018 Toyota Sequoia, 2017 Toyota Sequoia, and 2016 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

These DTCs are designed to detect a malfunction in the air pump heater relay circuit. When the system is normal, the battery voltage is applied to terminal HAI1 of the ECM while the air pump heater relay (AI-HTR) is turned off, and the battery voltage is not applied to terminal HAI1 of the ECM while the air pump heater relay (AI-HTR) is turned on. The ECM illuminates the MIL and stores a DTC when either one of the following conditions is detected.

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