Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC PRIORITY
If DTC P0340 is displayed with DTC P0643, first perform the confirmation procedure (trouble diagnosis) for DTC P0643.

Is DTC P0643 detected?

YES

Perform diagnosis for P0643. Refer to DTC Description .

NO

GO TO 2.
CHECK STARTING SYSTEM
Turn ignition switch to START position.

Does the engine turn over? Does the starter motor operate?

YES

GO TO 3.

NO

Check starting system. (Refer to Work Flow (With GR8-1200 NI) or Work Flow (Without GR8-1200 NI) . For details, Refer to Special Service Tool .)
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in Circuit Inspection .
Is the inspection result normal?

YES

GO TO 4.

NO

Repair or replace ground connection.

CHECK INTAKE CAMSHAFT POSITION SENSOR POWER SUPPLY

Disconnect intake camshaft position sensor harness connector.
Turn ignition switch ON.

Check the voltage between intake camshaft position sensor harness connector and ground.

DTC	+			-	Voltage (Approx.)
	Intake camshaft position sensor
	Bank	Connector	Terminal
P0340	1	F113	1	Ground	5 V
P0345	2	F115	1

Is the inspection result normal?

YES

GO TO 7.

GO TO 5.

CHECK INTAKE CAMSHAFT POSITION SENSOR POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between intake camshaft position sensor harness connector and ECM harness connector.

DTC	Intake camshaft position sensor			ECM		Continuity
DTC	Bank	Connector	Terminal	Connector	Terminal	Continuity
P0340	1	F113	1	F78	36	Existed
P0345	2	F115	1	F78	85	Existed

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

Is the inspection result normal?

YES

P0340: Perform the trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure .

YES

P0345: GO TO 6.

Repair or replace error-detected parts.

CHECK SENSOR POWER SUPPLY 2 CIRCUIT
Refer to Diagnosis Procedure .

Is the inspection result normal?

YES

Perform the trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure .

NO

Repair or replace error-detected parts.

CHECK INTAKE CAMSHAFT POSITION SENSOR GROUND CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between intake camshaft position sensor harness connector and ECM harness connector.

DTC	Intake camshaft position sensor			ECM		Continuity
DTC	Bank	Connector	Terminal	Connector	Terminal	Continuity
P0340	1	F113	2	F78	29	Existed
P0345	2	F115	2	F78	82	Existed

Also check harness for short to power.

Is the inspection result normal?

YES

GO TO 8.

Repair or replace error-detected parts.

CHECK INTAKE CAMSHAFT POSITION SENSOR INPUT SIGNAL CIRCUIT

Check the continuity between intake camshaft position sensor harness connector and ECM harness connector.

DTC	Intake camshaft position sensor			ECM		Continuity
DTC	Bank	Connector	Terminal	Connector	Terminal	Continuity
P0340	1	F113	3	F78	26	Existed
P0345	2	F115	3	F78	77	Existed

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

Is the inspection result normal?

YES

GO TO 9.

Repair or replace error-detected parts.

CHECK INTAKE CAMSHAFT POSITION SENSOR
Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 10.

NO

Replace malfunctioning intake camshaft position sensor. Refer to Exploded View .

CHECK CAMSHAFT (INTAKE)

Check the following.

Accumulation of debris to the signal plate of camshaft rear end

Chipping signal plate of camshaft rear end

Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES

INSPECTION END

Remove debris and clean the signal plate of camshaft rear end or replace camshaft. Refer to .