Diagnosis Procedure

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

CHECK DTC PRIORITY
1. Turn ignition switch ON.
2. Connect CONSULT and check for "ENGINE" diagnostic trouble codes.
3. Are any other DTCs displayed as current on the CONSULT screen.
Is DTC P0A0F-00 only current DTC detected?

YES

GO TO 2 .

NO

Refer to DTC Index .
INSPECT CAMSHAFT POSITION SENSOR
1. Turn ignition switch OFF.
2. Inspect camshaft position sensor for damage or misalignment.
Is the inspection result normal?

YES

GO TO 3 .

NO

Realign or replace camshaft position sensor. Refer to Removal and Installation .
INSPECT CRANKSHAFT POSITION SENSOR
1. Turn ignition switch OFF.
2. Inspect crankshaft position sensor for damage or misalignment.
Is the inspection result normal?

YES

GO TO 4 .

NO

Realign or replace crankshaft position sensor. Refer to Removal and Installation .
INSPECT CRANKSHAFT TONE WHEEL
1. Turn ignition switch OFF.
2. Inspect crankshaft tone wheel for damage.
Is the inspection result normal?

YES

GO TO 5 .

NO

Replace crankshaft tone wheel. Refer to Removal and Installation .

CHECK THE CRANKSHAFT SENSOR SUPPLY VOLTAGE AND RETURN CIRCUIT

Turn ignition switch OFF.
Disconnect the crankshaft position sensor harness connector F110.
Turn ignition switch ON.

Measure the voltage between crankshaft position sensor harness connector F110 terminals 1 and 2.

Crankshaft position sensor

Voltage (V)

(Approx.)

Connector

Terminal

F110

4.75-5.25

Is inspection result normal?

YES

GO TO 10 .

GO TO 6.

INSPECT ECM AND HARNESS CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector F101.
3. Inspect the ECM connector pins for the following:
  - Loose connector
  - Corroded pins
  - Bent or broken pins
  - Pushed back or expanded pins
  - Moisture in or on the connector
  - Missing or damaged connector seals
  - Dirt or debris on or in the connector pins
  - Connector shell broken
  - Wire insulation damage
  - Damaged connector locking tab.
Is the inspection result normal?

YES

GO TO 7 .

NO

Repair or replace error-detected parts

CHECK FOR AN OPEN CIRCUIT IN THE HARNESS

Turn ignition switch OFF.
Disconnect the ECM harness connector F101.
Disconnect the crankshaft position sensor harness connector F110.

Measure the resistance between the ECM harness connector F101 terminal 189 and the crankshaft position sensor harness connector F110 terminal 3.

ECM		Camshaft position sensor		Resistance
Connector	Terminal	Connector	Terminal	Resistance
F101	189	F110	3	< 10 Ω

Is the inspection result normal?

YES

GO TO 8 .

Repair or replace the harness for an open.

CHECK FOR A PIN-TO-PIN SHORT CIRCUIT IN THE HARNESS

Turn ignition switch OFF.
Disconnect the ECM harness connector F101.
Disconnect the crankshaft position sensor harness connector F110.

Measure the resistance between the ECM harness connector F101 terminal 189 and all other terminals in the ECM harness connector F101.

ECM		ECM		Resistance
Connector	Terminal	Connector	Terminal	Resistance
F101	189	F101	All	> 100k Ω

Is the inspection result normal?

YES

GO TO 9 .

Repair or replace the harness for a short.

VERIFY CRANKSHAFT POSITION SENSOR AIR GAP
1. Turn ignition switch OFF.
2. Disconnect the ECM harness connector F101.
3. Disconnect crankshaft position sensor harness connector F110.
4. Remove crankshaft position sensor.
5. Measure crankshaft position sensor air gap at several points in the crankshaft's revolution. Refer to Component Inspection .
Is the inspection result normal?

YES

Replace the crankshaft position sensor. Refer to Removal and Installation .

NO

Replace or shim the sensor if the air gap is out of specification.

CHECK THE CAMSHAFT SENSOR SUPPLY VOLTAGE AND RETURN CIRCUIT

Turn ignition switch OFF.
Disconnect the camshaft position sensor harness connector F109.
Turn ignition switch ON.

Measure the voltage between camshaft position sensor harness connector F109 terminals 1 and 2.

Camshaft position sensor

Voltage (V)

(Approx.)

Connector

Terminal

F109

4.75-5.25

Is inspection result normal?

YES

GO TO 15.

GO TO 11.

INSPECT ECM AND HARNESS CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector F101.
3. Inspect the ECM connector pins for the following:
  - Loose connector
  - Corroded pins
  - Bent or broken pins
  - Pushed back or expanded pins
  - Moisture in or on the connector
  - Missing or damaged connector seals
  - Dirt or debris on or in the connector pins
  - Connector shell broken
  - Wire insulation damage
  - Damaged connector locking tab
Is the inspection result normal?

YES

GO TO 12 .

NO

Repair or replace error-detected parts.

CHECK FOR AN OPEN CIRCUIT IN THE HARNESS

Turn ignition switch OFF.
Disconnect the ECM harness connector F101.
Disconnect the camshaft position sensor harness connector F109.

Measure the resistance between the ECM harness connector F101 terminal 168 and the camshaft position sensor harness connector F109 terminal 3.

ECM		Camshaft position sensor		Resistance
Connector	Terminal	Connector	Terminal	Resistance
F101	168	F109	3	< 10 Ω

Is the inspection result normal?

YES

GO TO 13 .

Repair or replace the harness for an open.

CHECK FOR A PIN-TO-PIN SHORT CIRCUIT IN THE HARNESS

Turn ignition switch OFF.
Disconnect the ECM harness connector F101.
Disconnect the camshaft position sensor harness connector F109.

Measure the resistance between the ECM harness connector F101 terminal 168 and all other terminals in the ECM harness connector F101.

ECM		ECM		Resistance
Connector	Terminal	Connector	Terminal	Resistance
F101	168	F101	All	> 100k Ω

Is the inspection result normal?

YES

GO TO 14 .

Repair or replace the harness for a short.

VERIFY CAMSHAFT POSITION SENSOR AIR GAP
1. Turn ignition switch OFF.
2. Disconnect the ECM harness connector F101.
3. Disconnect camshaft position sensor harness connector F109.
4. Remove camshaft position sensor.
5. Measure camshaft position sensor air gap at several points in the camshaft's revolution. Refer to Component Inspection .
Is the inspection result normal?

YES

Replace the camshaft position sensor. Refer to Removal and Installation .

NO

Replace or shim the sensor if the air gap is out of specification.
ERASE DTC
1. Connect all components.
2. Turn ignition switch ON.
3. Using CONSULT erase "ENGINE" diagnostic trouble codes.
4. Perform "DTC CONFIRMATION PROCEDURE".
Is P0A0F-00 DTC current?

YES

Return to the diagnosis procedure steps if all steps have been completed and check again.

NO

Inspection End.