Faulty EVAP canister purge volume control solenoid valve (stuck, or open or shorted coil); Damaged, corroded or loose wiring or connector at the purge valve; Open or short circuit in the harness between the valve and the engine control unit, or in its power supply; Blocked, split or disconnected EVAP vacuum hoses affecting valve operation or feedback; Blown fuse or fault in the relay or power feed to the valve; Fault in the engine control unit driver circuit.

P1492

EVAP Canister Purge Control Solenoid Valve Circuit.

Nissan
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
4: AreaAuxiliary emission controls
92: FaultThe specific fault in that area

What it means

On a Nissan, P1492 relates to the EVAP canister purge control solenoid valve circuit. The engine control unit monitors the purge volume control valve circuit and sets the code when the electrical signal or feedback does not match what it is commanding, which points to an open circuit, short circuit or a faulty valve. Exact wording and test conditions vary by model and engine, so check the manufacturer's information for the specific vehicle.

Symptoms

Engine warning light on
Rough or unstable idle
Difficulty starting after refuelling
Slight hesitation or poor fuel economy
Fuel smell near the engine bay or tank
Possible failed emissions test

Possible causes

Faulty EVAP canister purge volume control solenoid valve (stuck, or open or shorted coil)likely
Damaged, corroded or loose wiring or connector at the purge valvelikely
Open or short circuit in the harness between the valve and the engine control unit, or in its power supplypossible
Blocked, split or disconnected EVAP vacuum hoses affecting valve operation or feedbackpossible
Blown fuse or fault in the relay or power feed to the valvepossible
Fault in the engine control unit driver circuitrare

How to diagnose

Read all stored codes and freeze frame data, noting engine temperature, load and speed when the fault set, and check for related EVAP codes.
Visually inspect the purge valve, its connector and the nearby harness for damage, corrosion, heat damage or chafing.
Check EVAP hoses and connections to the valve and canister for cracks, kinks, blockages or disconnection.
Measure the valve coil resistance and compare it with the manufacturer's specification for that model.
Check for the supply voltage at the valve connector with the ignition on, and check the related fuse.
Command the valve on and off with a suitable scan tool and listen or feel for clicking, then check the control signal at the connector.
Test the harness between the valve and the control unit for continuity, short to earth and short to voltage.
Clear the code and road test, then recheck whether it returns and whether the valve now operates correctly.

How to fix

Replace the purge volume control solenoid valve if it fails resistance or operation tests.
Repair or replace damaged wiring and clean or renew corroded connector terminals.
Replace split, blocked or loose EVAP hoses and refit them securely.
Restore the power supply by replacing a blown fuse after finding what caused it to fail.
Have the control unit tested and repaired or replaced only after the wiring and valve have been proven good.

Can I keep driving?

Low severity

The car can normally be driven while you book it in, as this is mainly an emissions and vapour control fault. If the idle becomes rough, you smell fuel or it starts to run badly, get it checked sooner.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.