Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

INSPECTION START
Do you have CONSULT?

YES

GO TO 2.

NO

GO TO 3.
CHECK EVAP CANISTER VENT CONTROL VALVE CIRCUIT
With CONSULT
1. Turn ignition switch OFF and then ON.
2. On CONSULT screen, select "ENGINE">>"Active Test">>"VENT CONTROL/V".
3. Touch "ON/OFF" on CONSULT screen.
4. Check for operating sound of the valve.
  
  Clicking sound should be heard.
Is the inspection result normal?

YES

GO TO 6.

NO

GO TO 3.

CHECK EVAP CANISTER VENT CONTROL VALVE POWER SUPPLY

Turn ignition switch OFF.
Disconnect EVAP canister vent control valve harness connector.
Turn ignition switch ON.

Check the voltage between EVAP canister vent control valve harness connector and ground.

+		-	Voltage
EVAP canister vent control valve
Connector	Terminal
B31	1	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 5.

GO TO 4.

CHECK EVAP CANISTER VENT CONTROL VALVE POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect IPDM E/R harness connector.

Check the continuity between EVAP canister vent control valve harness connector and IPDM E/R harness connector.

EVAP canister vent control valve		IPDM E/R		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B31	1	E121	13	Existed

Also check harness for short to ground.

Is the inspection result normal?

YES

Perform the trouble diagnosis for power supply circuit.

Repair or replace error-detected parts.

CHECK EVAP CANISTER VENT CONTROL VALVE OUTPUT SIGNAL CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between EVAP canister vent control valve harness connector and ECM harness connector.

EVAP canister vent control valve		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B31	2	E32	193	Existed

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

Is the inspection result normal?

YES

GO TO 6.

Repair or replace error-detected parts.

CHECK RUBBER TUBE FOR CLOGGING
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.
CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to Component Inspection .

Is the inspection result normal?

YES

INSPECTION END

NO

Replace EVAP canister vent control valve. Refer to Removal and Installation .