Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
2. Check that water is not inside connectors.
Is the inspection result normal?

YES

GO TO 2.

NO

Repair or replace harness connector.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY

Turn ignition switch ON.

Check the voltage between EVAP control system pressure sensor harness connector and ground.

+		-	Voltage (V)
EVAP control system pressure sensor
Connector	Terminal
B41	3	Ground	Approx. 5

Is the inspection result normal?

YES

GO TO 4.

GO TO 3.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.

EVAP control system pressure sensor		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B41	3	E10	125	Existed

Is the inspection result normal?

YES

INSPECTION END

Repair open circuit.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.

EVAP control system pressure sensor		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B41	1	E10	148	Existed

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

GO TO 5.

Repair open circuit, short to ground or short to power in harness or connectors.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT

Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.

EVAP control system pressure sensor		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B41	2	E10	121	Existed

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

GO TO 6.

Repair open circuit, short to ground or short to power in harness or connectors.

CHECK RUBBER TUBE
1. Disconnect rubber tube connected to EVAP canister vent control valve.
2. Check the rubber tube for clogging.
Is the inspection result normal?

YES

GO TO 7.

NO

Clean the rubber tube using an air blower, repair or replace rubber tube.
CHECK EVAP CANISTER VENT CONTROL VALVE
Check EVAP canister vent control valve. Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 8.

NO

Replace EVAP canister vent control valve. Refer to Removal and Installation .
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Check EVAP control system pressure sensor. Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 9.

NO

Replace EVAP control system pressure sensor. Refer to Removal and Installation .

CHECK IF EVAP CANISTER IS SATURATED WITH WATER

Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached. Refer to Removal and Installation .

Check if water will drain from the EVAP canister.

Courtesy of NISSAN NORTH AMERICA, INC.

Does water drain from the EVAP canister?

YES

GO TO 10.

INSPECTION END

CHECK EVAP CANISTER
Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached.

The weight should be less than 2.1 kg (4.6 lb).

Is the inspection result normal?

YES

INSPECTION END

NO

GO TO 11.
DETECT MALFUNCTIONING PART
Check the following.
- EVAP canister for damage
- EVAP hose between EVAP canister and vehicle frame for clogging or poor connection
Repair hose or replace EVAP canister. Refer to Removal and Installation .