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Nissan Frontier. Manual - part 421

P0327, P0328 KS

EC-255

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0327, P0328 KS

Component Description

INFOID:0000000009480911

The knock sensor is attached to the cylinder block. It senses engine

knocking using a piezoelectric element. A knocking vibration from

the cylinder block is sensed as vibrational pressure. This pressure is

converted into a voltage signal and sent to the ECM.

On Board Diagnosis Logic

INFOID:0000000009480912

The MIL will not light up for these self-diagnoses.

DTC Confirmation Procedure

INFOID:0000000009480913

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT

1. Start engine 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-255, "Diagnosis Procedure"

WITH GST

Follow the procedure “WITH CONSULT” above.

Diagnosis Procedure

INFOID:0000000009480914

CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check resistance between ECM terminal 61 and 67. Refer to Wiring Diagram.

NOTE:

It is necessary to use an ohmmeter which can measure more than 10 M

Ω.

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

>> GO TO 4.

>> GO TO 2.

CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II

BBIA0618E

DTC No.

Trouble Diagnosis Name

DTC Detected Condition

Possible Cause

P0327
0327

Knock sensor circuit low
input

An excessively low voltage from the sensor is
sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted.)

• Knock sensor

P0328
0328

Knock sensor circuit high
input

An excessively high voltage from the sensor is
sent to ECM.

Resistance: Approximately 532 - 588 k

Ω [at 20°C (68°F)]

EC-256

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0327, P0328 KS

1. Disconnect knock sensor harness connector.

2. Check harness continuity between ECM terminal 61 and knock

sensor terminal 1.

Refer to Wiring Diagram.

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

>> GO TO 3.

>> Repair open circuit, short to ground or short to power in

harness or connectors.

CHECK KNOCK SENSOR

Refer to

EC-257, "Component Inspection"

OK or NG

>> GO TO 4.

>> Replace knock sensor. Refer to

EM-80, "Exploded View"

CHECK GROUND CONNECTIONS

Loosen and retighten two ground screws on the body.

Refer to

EC-149, "Ground Inspection"

OK or NG

>> GO TO 5.

>> Repair or replace ground connections.

CHECK KNOCK SENSOR SHIELD CIRCUIT FOR OPEN AND SHORT

1. Disconnect knock sensor harness connector.

2. Check harness continuity between knock sensor terminal 2 and ECM terminal 67. Refer to Wiring Dia-

gram.

OK or NG

>> GO TO 6.

>> GO TO 7.

DETECT MALFUNCTIONING PART

Check the following.

• Harness for open or short between knock sensor and ground

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

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

>> INSPECTION END

Continuity should exist.

BBIA0618E

BBIA0614E

Continuity should exist.

P0327, P0328 KS

EC-257

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

Component Inspection

INFOID:0000000009480915

KNOCK SENSOR

Check resistance between knock sensor terminal 1 and 2.

NOTE:

It is necessary to use an ohmmeter which can measure more

than 10 M

Ω.

CAUTION:

Never use any knock sensors that have been dropped or physi-

cally damaged. Use only new ones.

Resistance: Approximately 532 - 588k

Ω [at 20°C (68°F)]

SEF227W

EC-258

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0335 CKP SENSOR (POS)

P0335 CKP SENSOR (POS)

Component Description

INFOID:0000000009480916

The crankshaft position sensor (POS) is located on the cylinder

block rear housing facing the gear teeth (cogs) of the signal plate at

the end of the crankshaft. It detects the fluctuation of the engine rev-

olution.

The sensor consists of a permanent magnet and Hall IC.

When the 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.

The ECM receives the voltage signal and detects the fluctuation of

the engine revolution.

ECM receives the signals as shown in the figure.

On Board Diagnosis Logic

INFOID:0000000009480917

DTC Confirmation Procedure

INFOID:0000000009480918

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

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

tion switch ON.

WITH CONSULT

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-259, "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-259, "Diagnosis Procedure"

PBIB0562E

PBIB2382E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0335
0335

Crankshaft position sen-
sor (POS) circuit

• The crankshaft position sensor (POS) signal

is not detected by the ECM during the first
few seconds of engine cranking.

• The proper pulse signal from the crankshaft

position sensor (POS) is not sent to ECM
while the engine is running.

• The crankshaft position sensor (POS) signal

is not in the normal pattern during engine run-
ning.

• Harness or connectors

(The sensor circuit is open or shorted)

• Crankshaft position sensor (POS)
• Signal plate

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