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EC-394 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P1800 VIAS CONTROL SOLENOID VALVE 1 P1800 VIAS CONTROL SOLENOID VALVE 1 Description INFOID:0000000009720140 The VIAS control solenoid valve 1 cuts the intake manifold vacuum signal for power valve 1 control. It DTC Logic INFOID:0000000009720141 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. CONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- 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. TESTING CONDITION: >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start engine and let it idle for at least 5 seconds. 2. Check 1st trip DTC. Is 1st trip DTC detected? YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000009720142 1. CHECK VIAS CONTROL SOLENOID VALVE 1 POWER SUPPLY CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect VIAS control solenoid valve 1 harness connector. 3. Turn ignition switch ON. 4. Check the voltage between VIAS control solenoid valve 1 harness connector and ground. Is the inspection result normal? YES >> GO TO 2. NO >> Repair open circuit, short to ground or short to power in harness or connectors. 2. CHECK VIAS CONTROL SOLENOID VALVE 1 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. DTC No. Trouble diagnosis name DTC detecting condition Possible cause P1800 VIAS control solenoid valve 1 An excessively low or high voltage signal • Harness or connectors (The solenoid valve 1 circuit is open or • VIAS control solenoid valve 1 VIAS control solenoid valve 1 Ground Voltage Connector Terminal F74 1 Ground Battery voltage |