P1110 NISSAN – Intake Valve Timing Control, Bank 1

Code Meaning

P1110 indicates a malfunction in the intake valve hydraulic control system (Variable Valve Timing, VVT). The ECM detects a discrepancy between the target cam angle and the actual angle, locking the solenoid valve in the default position.

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Common Symptoms

• 🚨 Check engine light on

• ⚠️ Loss of power (especially at low/mid RPM)

• 🔧 Rough idle or vibrations

• ⛽ Increased fuel consumption

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Possible Causes

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System Operation

1. Hydraulic control:

   • The ECM uses data from sensors (crankshaft, camshaft, RPM, temperature).

   • It sends a PWM signal to the VVT solenoid valve:

     • Long pulse → Advances valve angle.

     • Short pulse → Retards angle.

     • 50% duty cycle → Locks in neutral position.

2. Effects:

   • Optimizes torque (low RPM) and power (high RPM).

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Diagnostic Procedure

Step 1: Preliminary checks (80% of cases resolved here!)

• ✅ Oil check:

  • Check level and quality (dirty oil = immediate change + filter).

  • If oil pressure light is on: perform manual pressure test.

• 🔍 Visual inspection:

  • VVT solenoid valve cables and connectors (look for bent pins, corrosion, cut wires).

Step 2: Electrical tests

• 🔌 Solenoid valve test:

  • Measure resistance with a multimeter (compare to Nissan specifications).

  • Check power supply voltage (12V) and ground.

• 📡 Sensor signals:

  • Check crankshaft/camshaft sensor data via OBD2 scanner.

Step 3: Advanced diagnostics

• 🔄 Reset and test:

  • Clear the code, drive 15 km to check for reappearance.

  • If intermittent: monitor real-time data (target vs. actual VVT angle).

• ⚙️ Hydraulic test:

  • Remove solenoid valve, clean oil passages with specialized degreaser.

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Repair Solutions

Pro Tip:

• Always clean the solenoid valve before replacing it! Dirt is often the real culprit.

• Check Nissan Technical Service Bulletins (TSB) for recurring failures on your model.