Nissan Murano: Dtc/circuit Diagnosis / P0078 Evt Control Solenoid Valve

DTC Description

DTC DETECTION LOGIC

An improper voltage is sent to the ECM through exhaust valve timing control solenoid valve.

POSSIBLE CAUSE

P0078

• Harness or connectors (Exhaust valve timing control solenoid valve circuit is open or shorted.)

• Exhaust valve timing control solenoid valve

P0084

• Harness or connectors (Exhaust valve timing control solenoid valve circuit is open or shorted.)

• Exhaust valve timing control solenoid valve

FAIL-SAFE

Not applicable

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start the engine and let it idle for 5 seconds.

2. Check 1st trip DTC.

Is 1st trip DTC detected?

Proceed to Diagnosis Procedure.

To check malfunction symptom before repair: Refer to Intermittent Incident.

Confirmation after repair: INSPECTION END

CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT - 1

1. Turn ignition switch OFF.

2. Disconnect exhaust valve timing control solenoid valve harness connector.

3. Turn ignition switch ON.

4. Check the voltage between exhaust valve timing control solenoid valve harness connector and ground.

   DTC	+			−	Voltage
   	Exhaust valve timing control solenoid valve
   	Bank	Connector	Terminal
   P0078	1	F72	1	Ground	Battery voltage
   P0084	2	F73	1

Is the inspection result normal?

GO TO 2.

GO TO 4.

CHECK EVT CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between exhaust valve timing control solenoid valve harness connector and ECM harness connector.

   DTC	+			−		Continuity
   	Exhaust valve timing control solenoid valve			ECM
   	Bank	Connector	Terminal	Connector	Terminal
   P0078	1	F72	2	F79	58	Existed
   P0084	2	F73	2		60

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

Is the inspection result normal?

GO TO 3.

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

CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE

Check exhaust valve timing control solenoid valve. Refer to Component Inspection.

Is the inspection result normal?

INSPECTION END

Replace malfunctioning exhaust valve timing control solenoid valve. Refer to Exploded View.

CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT - 2

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector.

3. Check the continuity between IPDM E/R harness connector and exhaust valve timing control solenoid valve harness connector.

   DTC	+		−		Continuity
   	IPDM E/R		Exhaust valve timing control solenoid valve
   	Connector	Terminal	Connector	Terminal
   P0075	F19	59	F72	1	Existed
   P0081			F73		Existed

4. Also check harness for short to ground.

Is the inspection result normal?

Perform the trouble diagnosis for power supply circuit.

Repair or replace error-detected parts.

CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE - 1

1. Turn ignition switch OFF.

2. Disconnect exhaust valve timing control solenoid valve harness connector.

3. Check resistance between exhaust valve timing control solenoid valve terminals as follows.

   Exhaust valve timing control solenoid valve		Condition		Resistance
   +	−
   Terminal
   2	1	Temperature	20°C (68°F)	7.0 – 7.8 Ω
   1	Ground			∞ (Continuity should not exist)
   2

Is the inspection result normal?

GO TO 2.

Replace malfunctioning exhaust valve timing control solenoid valve. Refer to Exploded View.

CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE - 2

1. Remove exhaust valve timing control solenoid valve. Refer to Exploded View.

2. Apply 12 V between exhaust valve timing control solenoid valve terminals 1 and 2, and then interrupt it. Check that the plunger moves as shown in the figure.

   

   CAUTION:

   Never apply 12 V continuously for 5 seconds or more. Doing so may result in damage to the coil in exhaust valve timing control solenoid valve.

   NOTE:

   Always replace O-ring when exhaust valve timing control solenoid valve is removed.

Is the inspection result normal?

INSPECTION END

Replace malfunctioning exhaust valve timing control solenoid valve. Refer to Exploded View.