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EC-278 < COMPONENT DIAGNOSIS > [VQ25DE, VQ35DE] P1574 ASCD VEHICLE SPEED SENSOR P1574 ASCD VEHICLE SPEED SENSOR Description INFOID:0000000003856758 The ECM receives two vehicle speed signals via CAN communication line. One is sent from combination for ASCD functions. DTC Logic INFOID:0000000003856759 DTC DETECTION LOGIC NOTE: U1001. Refer to . • If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer • If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer • If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start engine (VDC switch OFF). 2. Drive the vehicle at more than 40 km/h (25 MPH). CAUTION: Always drive vehicle at a safe speed. 3. Check DTC. Is DTC detected? YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000003856760 1. CHECK DTC WITH TCM Check DTC with TCM. Refer to TM-35, "Diagnosis Description" . Is the inspection result normal? YES >> GO TO 2. DTC No. Trouble diagnosis name DTC detecting condition Possible cause P1574 ASCD vehicle speed The difference between the two vehicle speed • Harness or connectors (The CAN communication line is open or • Combination meter |