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System Description EGR CONTROL Camshaft position sensor (TDC) E Engine speed ECM E EGRC-solenoid valve A Mass air flow sensor E Mass air flow E EGRC-solenoid valve B Engine coolant temperature sensor E Engine coolant temperature E Throttle control solenoid valve Ignition switch E Start signal Atmospheric pressure sensor E Atmospheric pressure Air conditioner switch E Air conditioner “ON” signal The ECM receives signals sent from the engine coolant tempera- Engine coolant temperature °C (°F) Load EGRC-solenoid valve Throttle control solenoid valve EGR valve Throttle control valve Amount of EGR gas A B Below 45 (113) Any OFF (Closed) OFF (Closed) OFF (Closed) Fully closed Fully open — Above 45 (113) Low load ON (Open) ON (Open) ON (Open) Fully open Closed Large Medium load-1 ON (Open) ON (Open) OFF (Closed) Fully open Fully open Medium Medium load-2 ON (Open) OFF (Closed) OFF (Closed) Half open Fully open Small High load OFF (Closed) OFF (Closed) OFF (Closed) Fully closed Fully open — Component Description The EGRC-solenoid valves A and B, control vacuum pressure act- NEF513 DTC P1404 EGR SOL/V A, DTC P1405 EGR SOL/V B/P1407 THROTTLE SOLENOID VALVE TD27Ti EC-454 |