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DTC P1490 VACUUM CUT VALVE BYPASS VALVE EC-581 C D E F G H I J K L M A EC 3. CHECK VACUUM CUT VALVE BYPASS VALVE POWER SUPPLY CIRCUIT 1. Turn ignition switch “OFF”. 2. Disconnect vacuum cut valve bypass valve harness connector. 3. Turn ignition switch “ON”. 4. Check voltage between vacuum cut valve bypass valve terminal OK or NG OK >> GO TO 5. NG >> GO TO 4. 4. DETECT MALFUNCTIONING PART Check the following. ● Harness connectors B401, B251 ● Harness connectors B204, E224 ● Fuse, fusible link and relay block (J/B) connector E3 ● 10A fuse ● Harness for open or short between vacuum cut valve bypass valve and fuse >> Repair harness or connectors. 5. CHECK VACUUM CUT VALVE BYPASS VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch “OFF”. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 43 and vacuum cut valve bypass valve terminal 2. 4. Also check harness for short to ground and short to power. OK or NG OK >> GO TO 7. NG >> GO TO 6. Voltage: Battery voltage PBIB0026E PBIB0158E Continuity should exist. |