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P1574 ASCD VEHICLE SPEED SENSOR EC-1421 < COMPONENT DIAGNOSIS > [VQ35DE] C D E F G H I J K L M A EC N P O P1574 ASCD VEHICLE SPEED SENSOR Description INFOID:0000000004362282 The ECM receives two vehicle speed signals via the CAN communication line. One is sent from combination meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD con- trol. Refer to DTC Logic INFOID:0000000004362283 DTC DETECTION LOGIC NOTE: • If DTC P1574 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX. 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 perform the following before conduct- ing the next test. 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start engine (ESP switch OFF). 2. Drive the vehicle at more than 40 km/h (25 MPH). CAUTION: Always drive vehicle at a safe speed. NOTE: This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle. 3. Check DTC. YES >> Go to EC-1421, "Diagnosis Procedure" NO >> INSPECTION END Diagnosis Procedure INFOID:0000000004362284 1. CHECK DTC WITH TCM Check DTC with TCM. Refer to TM-117, "Diagnosis Description" 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 |