Nissan Frontier. Manual - part 543

P0340, P0345 CMP SENSOR (PHASE)

EC-743

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

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P0340, P0345 CMP SENSOR (PHASE)

Component Description

INFOID:0000000009481399

The camshaft position sensor (PHASE) senses the retraction of

intake valve camshaft to identify a particular cylinder. The camshaft

position sensor (PHASE) senses the piston position.

When the crankshaft position sensor (POS) system becomes inoper-

ative, the camshaft position sensor (PHASE) provides various con-

trols of engine parts instead, utilizing timing of cylinder identification

signals.

The sensor consists of a permanent magnet and Hall IC.

When engine is running, the high and low parts of the teeth cause

the gap with the sensor to change.

The changing gap causes the magnetic field near the sensor to

change.

Due to the changing magnetic field, the voltage from the sensor changes. 

ECM receives the signals as shown in the figure.

On Board Diagnosis Logic

INFOID:0000000009481400

DTC Confirmation Procedure

INFOID:0000000009481401

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next step.

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.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 10.5V with igni-

tion switch ON.
1. Crank engine for at least 2 seconds and run it for at least 5 seconds at idle speed.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to 

EC-744, "Diagnosis Procedure"

.

If 1st trip DTC is not detected, go to next step.

4. Maintaining engine speed at more than 800 rpm for at least 5 seconds.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to 

EC-744, "Diagnosis Procedure"

.

PBIB0562E

PBIB2744E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0340
0340
(Bank 1)

Camshaft position sen-
sor (PHASE) circuit

• The cylinder No. signal is not sent to ECM for 

the first few seconds during engine cranking.

• The cylinder No. signal is not sent to ECM 

during engine running.

• The cylinder No. signal is not in the normal 

pattern during engine running.

• Harness or connectors

(The sensor circuit is open or shorted)

• Camshaft position sensor (PHASE)
• Camshaft (Intake)
• Starter motor
• Starting system circuit
• Dead (Weak) battery

P0345
0345
(Bank 2)

EC-744

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

P0340, P0345 CMP SENSOR (PHASE)

Diagnosis Procedure

INFOID:0000000009481402

1.

CHECK STARTING SYSTEM

Turn ignition switch to START position.

Yes or No

Yes

>> GO TO 2.

No

>> Check starting system. (Refer to 

STR-6, "Work Flow (With GR8-1200 NI)"

 or 

STR-10, "Work Flow

(Without GR8-1200 NI)"

.)

2.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten three ground screws on the body. Refer to 

EC-617, "Ground Inspection"

.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace ground connections.

3.

CHECK CAMSHAFT POSITION (CMP) SENSOR (PHASE) POWER SUPPLY CIRCUIT

1. Disconnect camshaft position (CMP) sensor (PHASE) harness

connector.

2. Turn ignition switch ON.

3. Check voltage between CMP sensor (PHASE) terminal 3 and ground with CONSULT or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E2, F32

• Harness for open or short between camshaft position sensor (PHASE) and ECM

• Harness for open or short between camshaft position sensor (PHASE) and IPDM E/R

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

5.

CHECK CMP SENSOR (PHASE) GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Check harness continuity between CMP sensor (PHASE) terminal 1 and ground.

3. Also check harness for short to power.
OK or NG

OK

>> GO TO 7.

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

BBIA0549E

Voltage: Battery voltage

Continuity should exist.

P0340, P0345 CMP SENSOR (PHASE)

EC-745

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

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NG

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors F32, E2

• Harness for open or short between CMP sensor (PHASE) and ground

>> Repair open circuit or short to power in harness or connectors.

7.

CHECK CMP SENSOR (PHASE) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector.

2. Check harness continuity between ECM terminal 94 (bank 1) or 93 (bank 2) and CMP sensor (PHASE)

terminal 2. 

Refer to Wiring Diagram.

3. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 8.

NG

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

8.

CHECK CAMSHAFT POSITION SENSOR (PHASE)

Refer to 

EC-745, "Component Inspection"

.

OK or NG

OK

>> GO TO 9.

NG

>> Replace malfunctioning camshaft position sensor (PHASE). Refer to 

EM-192, "Exploded View"

.

9.

CHECK CAMSHAFT (INTAKE)

Check the following.

• Accumulation of debris to the signal plate of camshaft rear end

• Chipping signal plate of camshaft rear end
OK or NG

OK

>> GO TO 10.

NG

>> Remove debris and clean the signal plate of camshaft

rear end or replace malfunctioning camshaft.

10.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009481403

CAMSHAFT POSITION SENSOR (PHASE)

1. Loosen the fixing bolt of the sensor.
2. Disconnect camshaft position sensor (PHASE) harness connector.
3. Remove the sensor.

Continuity should exist.

SEC905C

EC-746

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

P0340, P0345 CMP SENSOR (PHASE)

4. Visually check the sensor for chipping.

5. Check resistance as shown in the figure.

PBIB0563E

Terminal No. (Polarity)

Resistance 

Ω [at 25°C (77°F)]

1 (+) - 2 (-)

Except 0 or 

∞

1 (+) - 3 (-)

2 (+) - 3 (-)