P1145 INFINITI Possible Causes
- Faulty intake valve timing control solenoid valve
- Intake valve timing control solenoid valve harness is open or shorted
- Poor electrical connection in the intake valve timing control solenoid valve circuit
- Faulty crankshaft position sensor
- Faulty camshaft position sensor
How to Fix P1145 INFINITI Code?
Start by checking the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Technical Notes
Since the intake valve timing control solenoid valve uses oil flow to control timing, dirty oil can cause the valve to stick open or closed. Before replacing the valve, change the engine oil and filter and reset the engine code.
When is the Code Detected?
When there is a discrepancy between the target angle and the phase control angle degree, the valve will stop functioning and the ECM will trigger the P1145 code.
Possible Symptoms
- Engine light on (or service engine soon warning light)
- Possible engine misfire/loss of power
- Possible rough engine idle
P1145 INFINITI Meaning
This mechanism hydraulically controls the cam phases continuously with the fixed operating angle of the intake valve.
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 based on driving conditions. This controls the intake valve closing/opening timing to increase engine torque in the low/mid speed range and output in the high speed range.
The intake valve timing control solenoid valve changes the oil amount and flow direction through the intake valve timing control unit or stops the oil flow. Longer pulse width advances the valve angle. Shorter pulse width retards the valve angle. When ON and OFF pulse widths become equal, the solenoid valve stops the oil pressure flow to fix the intake valve angle at the control position.