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Home >> Nissan-Datsun >> 1993 >> Sentra SE-R, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Air Induction Systems >> Swirl Control Valve (Pickup 2.4L & 240SX) >> System Test
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System Test

  1. Start engine and bring to normal operating temperature. Turn ignition off. After a few seconds, disconnect vacuum hose to swirl control valve actuator. Actuator is located near flywheel end of intake manifold. Restart engine and check vacuum at disconnected hose.
  2. On Pickup, vacuum should exist at less than 3600 RPM and not exist at more than 3600 RPM. On 240SX, vacuum should exist at less than 2400 RPM and not exist at more than 2400 RPM. On all models, if vacuum does not exist as specified, leave engine running and go to next step. If vacuum exists as specified, system is functioning properly at this time.
  3. On Pickup, measure voltage between ECM terminal No. 12 (Gray wire) and ground. On 240SX, measure voltage between ECM terminal No. 25 (Gray wire) and ground. On Pickup, zero volts should exist at less than 3600 RPM and battery voltage should exist at more than 3600 RPM. On 240SX, zero volts should exist at less than 2400 RPM and battery voltage should exist at more than 2400 RPM.
  4. On all models, if voltage is as specified, check vacuum hose and swirl control valve for clogging, cracks and proper connection and repair as necessary. If voltage is not as specified, turn ignition off. Disconnect and inspect swirl control valve solenoid connector, located under intake manifold on Pickup or rear of cylinder head on 240SX. Repair connector as necessary.
  5. Turn ignition on. Measure voltage between solenoid connector Black/White wire (Pickup) or Brown wire (240SX) and ground. Battery voltage should exist. If battery voltage exists, go to next step. If battery voltage does not exist, check harness, connectors and fuse. Repair as necessary.
  6. Turn ignition off. Disconnect and inspect ECM harness connector for pushed-out, bent, damaged or corroded terminals. Repair connector as necessary. Check continuity of Gray wire between ECM terminal No. 12 (Pickup) or terminal No. 25 (240SX) and solenoid harness connector. Continuity should exist. If continuity does not exist, repair harness or connector as necessary. If continuity exists, check operation of swirl control valve solenoid. See CONTROL SOLENOID under SWIRL CONTROL VALVE  .
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