P1140 Infiniti Code - Intake Valve Timing Control Performance Bank 1
Quick Answer
This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake valve. Common causes include Faulty Intake Valve Timing Control Solenoid Valve Bank 1, Intake Valve Timing Control Solenoid Valve Bank 1 harness is open or shorted, Intake Valve Timing Control Solenoid Valve Bank 1 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1140 Infiniti indicates Intake Valve Timing Control Performance Bank 1.
- Common causes
- Common causes include Faulty Intake Valve Timing Control Solenoid Valve Bank 1, Intake Valve Timing Control Solenoid Valve Bank 1 harness is open or shorted, Intake Valve Timing Control Solenoid Valve Bank 1 circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1140 Infiniti Description
The Engine Control Module (ECM) receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing control solenoid valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to increase engine torque in low/mid speed range and output in high-speed range.
The intake valve timing control solenoid valve changes the oil amount and direction of flow through intake valve timing control unit or stops oil flow. The longer pulse width advances valve angle. The shorter pulse width retards valve angle. When ON and OFF pulse widths become equal, the solenoid valve stops oil pressure flow to fix the intake valve angle at the control position.
What are the Possible Causes of the DTC P1140 Infiniti?
- Faulty Intake Valve Timing Control Solenoid Valve Bank 1
- Intake Valve Timing Control Solenoid Valve Bank 1 harness is open or shorted
- Intake Valve Timing Control Solenoid Valve Bank 1 circuit poor electrical connection
- Faulty Crankshaft Position Sensor
- Faulty Camshaft Position Sensor
How to Fix the DTC P1140 Infiniti?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1140 Infiniti code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1140 Infiniti Code
No Frequently Asked Questions about P1140 Infiniti Code found.
Discuss the causes and fixes for P1140 Infiniti OBDII Code
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Hey...i have a 2003 m45 motor puts out p1140 ive changed the sensor twice this year now the motor knocks then it stops then it knocks again check engine light was solid and now it just blinks can somebody out there help me
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Which sensor did you replaced? Usually the P1140 is for the Intake Valve Timing Control Solenoid Valve Bank 1 and not the sensor.
How is the engine oil level and condition? When was the last time you change the engine oil and filter? -
I have 2006 m45 with that code what the part look like n the location of it
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If the problem is the the Intake Valve Timing Control Solenoid Valve, then is in front of the engine.
Click here to enlarge image
Click here to enlarge image -
For the 2002 Infiniti Q45 with the 4.5 liter V8 "Bank 1" is the driver side.
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