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Last Modified: 9-16-2014 6.6 C Doc ID: RM0000046N101EX Model Year: 2015 Model: Tundra Prod Date Range: [08/2014 - ] Title: 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P144C,P144D; Open in Secondary Air Injection System Heater Control Circuit; 2015 MY Tundra [08/2014 - ] DTC P144C Open in Secondary Air Injection System Heater Control Circuit DTC P144D Short in Secondary Air Injection System Heater Control Circuit DESCRIPTION The ECM operates the air pump heater (AI-HTR) relay which causes the air pump heater (AI-HTR) to operate. DTC NO. DTC DETECTION CONDITION TROUBLE AREA P144C Open or short in the air pump heater (AI-HTR) relay circuit for 5 seconds (1 trip detection logic). Open or short in air pump heater (AI-HTR) relay circuit Air pump heater (AI-HTR) relay ECM P144D Open or short in the air pump heater (AI-HTR) relay circuit for 5 seconds (1 trip detection logic). Open or short in air pump heater (AI-HTR) relay circuit Air pump heater (AI-HTR) relay ECM MONITOR DESCRIPTION These DTCs are designed to detect a malfunction in the air pump heater (AI-HTR) relay circuit. When the system The battery voltage is not applied to terminal HAI1 while the air pump heater (AI-HTR) relay is off. The battery voltage is applied to terminal HAI1 while the air pump heater (AI-HTR) relay is on. 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 (AI-HTR) Required Sensors/Components (Related) - Duration 5 seconds 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P144C,P144D... |