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EC-270 < COMPONENT DIAGNOSIS > [VQ25DE, VQ35DE] P1564 ASCD STEERING SWITCH P1564 ASCD STEERING SWITCH Description INFOID:0000000003856749 ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation for the ASCD function. DTC Logic INFOID:0000000003856750 DTC DETECTION LOGIC NOTE: 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. Turn ignition switch ON and wait at least 10 seconds. 2. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds. 3. Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds. 4. Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec- 5. Press SET/COAST switch for at least 10 seconds, then release it and wait at least 10 seconds. 6. Check DTC. Is DTC detected? YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000003856751 1. CHECK GROUND CONNECTION 1. Turn ignition switch OFF. 2. Check ground connection E38. Refer to Ground Inspection in . Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace ground connection. 2. CHECK ASCD STEERING SWITCH CIRCUIT With CONSULT-III 1. Turn ignition switch ON. 2. Select “MAIN SW”, “CANCEL SW”, “RESUME/ACC SW” and “SET SW” in “DATA MONITOR” mode with DTC No. Trouble diagnosis name DTC detecting condition Possible cause P1564 ASCD steering switch • An excessively high voltage signal from the ASCD steering switch is sent to ECM. • ECM detects that input signal from the ASCD steering switch is out of the specified • ECM detects that the ASCD steering switch is stuck ON. • Harness or connectors (The switch circuit is open or shorted.) • ASCD steering switch |