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TM-264 < COMPONENT DIAGNOSIS > [CVT: RE0F10A] P1778 STEP MOTOR - FUNCTION P1778 STEP MOTOR - FUNCTION Description INFOID:0000000003806475 • The step motor changes the step by turning 4 coils ON/OFF according to the signal from TCM. As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled. • This diagnosis item is detected when the electrical system is OK, but the mechanical system is NG. operate normally. DTC Logic INFOID:0000000003806476 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE CAUTION: • Always drive vehicle at a safe speed. “PRI SPEED” and “VEHICLE SPEED” on “Data Monitor”. • If hi-geared fixation occurred, go to NOTE: 1. CHECK DTC DETECTION With CONSULT-III 1. Turn ignition switch ON. 2. Select “Data Monitor” mode for “TRANSMISSION”. 3. Make sure that output voltage of CVT fluid temperature sensor is within the range specified below. 4. Start engine and maintain the following conditions for at least 30 consecutive seconds. With GST. Follow the procedure “With CONSULT-III”. YES >> Go to NO >> Check intermittent incident. Refer to GI-35, "Intermittent Incident" . Diagnosis Procedure INFOID:0000000003806477 1. CHECK STEP MOTOR SYSTEM DTC Item (CONSULT-III screen term) Malfunction is detected when... Possible cause P1778 STEP MOTR/FNC There is a big difference be- Step motor ATF TEMP SEN : 1.0 – 2.0 V If it is out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the Start test from 0 km/h (0 MPH) Constant acceleration : Keep 30 sec or more VEHICLE SPEED : 10 km/h (6 MPH) or more ACC PEDAL OPEN : More than 1.0/8 RANGE : “D” position ENG SPEED : 450 rpm or more |