P1165

Code

NISSAN P — Powertrain

Swirl Control Valve Control Vacuum Switch

Brand: NISSAN

Type: P — Powertrain

Views: UK: 17 EN: 28 RU: 25

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Page language: EN

Causes

Failed vacuum switching valve (VSV) or vacuum solenoid
Stuck or seized swirl control valve (mechanical)
Broken, shorted, or corroded wiring or connector in the VSV/switch circuit
Vacuum hose leak, restriction, or disconnected line to the actuator
Failed vacuum actuator (diaphragm) or internal leak
Intermittent connector contact or water intrusion

Symptoms

Malfunction Indicator Lamp (MIL) illuminated (check engine light)
Reduced low-end torque or drivability complaints during part-load
Rough idle or hesitation under some conditions
Decreased fuel economy and increased emissions
Possible limp performance or reduced engine responsiveness if ECU limits operation

What to check

Read and record freeze-frame data and pending/current DTCs with a scan tool
Confirm MIL status and readiness monitors; attempt to reproduce the fault
Visually inspect vacuum hoses, lines and fittings from VSV to actuator for disconnection, cracks or kinks
Inspect VSV/solenoid connector for corrosion, bent pins, or water intrusion
Backprobe/control-pin voltages at VSV connector with ignition ON and engine cranking (see signal parameters)
Measure coil resistance of the VSV/solenoid (compare to service spec)

Signal parameters

Control method: ECM switches/grounds VSV or provides PWM — consult model service data
Supply voltage to VSV: ~12 V (battery) when not switched; switched pin expected to be near 0 V (ground) when ECM activates (varies by model)
Coil resistance: typical VSV solenoid coil usually in the low tens of ohms (example 15–40 Ω) — check factory spec
When commanded ON, VSV should activate and allow vacuum to reach actuator; when OFF vacuum should be blocked (vacuum gauge or hand pump test)
If VSV is PWM-driven, duty cycle will vary with load and should change when commanded by ECM (use dealer/advanced scan tool to view)
Values vary by engine and year — verify exact numbers in Nissan service manual

Diagnostic algorithm

Use a scan tool to confirm P1165 is current and capture freeze-frame; clear code and attempt to reproduce.
Visually inspect vacuum lines and connectors for damage or disconnection; replace any damaged hose and re-test.
Inspect electrical connector at the VSV and actuator: unplug, check for corrosion, bent pins, and secure connection.
Backprobe the VSV connector: verify battery voltage on the supply pin and that the ECM switches/grounds the control pin when commanding the swirl function. Compare to service specifications.
Measure VSV coil resistance with a multimeter; if out of spec, replace the VSV/solenoid.
Bench test the VSV/solenoid by applying 12 V (and ground) to confirm movement. If it does not actuate, replace.
Apply vacuum to the actuator with a hand pump while observing the swirl valve operation. If the valve does not move under vacuum, inspect linkage or replace actuator or clean/replace the swirl valve.
If vacuum does not reach the actuator when VSV is commanded, verify VSV operation and check for blocked or leaking vacuum hoses; perform a smoke test for small leaks.
If wiring and components test good, check ECM output for proper switching; consider ECM fault only after eliminating wiring, connector, and component failures.
After repair or replacement, clear codes and perform a road test and confirm no return of P1165.

Likely causes

Faulty vacuum switching valve (VSV) or solenoid
Damaged/ruptured vacuum hose between VSV and actuator
Swirl control flap/shaft stuck from carbon build-up
Corroded/loose electrical connector at VSV or actuator
Open/short in control wiring to ECM

Fault status

⚠️ Status

P1165 — Swirl Control Valve Control Vacuum Switch: The ECM detected an abnormality in the vacuum/switching control circuit for the intake swirl control system. This may set the MIL and can affect low-speed torque and emissions until repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 2.5 hours

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