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CONTROL SYSTEM 01–40–17 01–40 Maximum Cam Retard Mode • When any of the following conditions are met: — Cranking — Idling after completion of cleaning mode — DTC stored for the following devices: • ECT sensor • CKP sensor • CMP sensor • TP sensor • MAF sensor • OCV Purpose • Maximum cam retard mode stabilizes engine speed by maximally retarding the valve timing when the engine speed is low during idling. Operation • When the target current in the maximum cam retard mode is fixed at 100 mA. When 100 mA current is supplied, the OCV opens the hydraulic passage for the retard chamber and hydraulic pressure from the oil Feedback Hold Mode • Target valve timing and actual valve timing are almost the same. Purpose • The feedback hold mode holds the valve timing by returning the OCV spool valve to the neutral position when target valve timing suitable for the engine operation conditions is obtained. Operation • Though the target current in the feedback hold mode is basically around 600 mA, feedback operation is performed at all times so that the present OCV drive current approaches the target current. Because the hold ADVANCE SPEED INCREASES CHANGES ACCORDING TO MECHANICAL ADVANCE RETARD APPROX. 100 mA APPROX. 600 mA APPROX. 1,000 mA OCV OPERATION CURRENT E5U140ZT5101 |