Nissan Frontier. Manual - part 655

P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE

EC-1191

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

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14.

CHECK IGNITION TIMING

Check the following items. Refer to 

EC-1068, "Basic Inspection"

.

OK or NG

OK

>> GO TO 15.

NG

>> Follow the 

EC-1068, "Basic Inspection"

.

15.

CHECK A/F SENSOR 1 INPUT SIGNAL

1. Turn ignition switch OFF.

2. Disconnect A/F sensor 1 harness connector.

3. Disconnect ECM harness connector.

4. Check harness continuity between A/F sensor 1 terminal and ECM terminal as follows.

Refer to Wiring Diagram.

5. Check harness continuity between the following terminals and ground.

Refer to Wiring Diagram.

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

OK

>> GO TO 16.

NG

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

and A/F sensor 1.

16.

CHECK A/F SENSOR 1 HEATER

Refer to 

EC-1102, "Component Inspection"

.

OK or NG

Items

Specifications

Target idle speed

625 

± 50 rpm (in P or N position)

Ignition timing

15 

± 5° BTDC (in P or N position)

A/F sensor 1 terminal

ECM terminal

Bank 1

1

35

2

56

Bank 2

1

16

2

75

Continuity should exist.

Bank 1

Bank 2

A/F sensor 1 terminal

ECM terminal

A/F sensor 1 terminal

ECM terminal

1

35

1

16

2

56

2

75

Continuity should not exist.

BBIA0544E

EC-1192

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE

OK

>> GO TO 18.

NG

>> GO TO 17.

17.

REPLACE A/F SENSOR 1

Replace malfunctioning A/F sensor 1. Refer to 

EM-147, "Exploded View"

.

CAUTION:

• Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a

hard surface such as a concrete floor; use a new one.

• Before installing new A/F sensor, clean exhaust system threads using Heated Oxygen Sensor

Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END

18.

CHECK MASS AIR FLOW SENSOR

 With CONSULT

Check mass air flow sensor signal in “DATA MONITOR” mode with CONSULT.

 With GST

Check mass air flow sensor signal in Service $01 with GST.

OK or NG

OK

>> GO TO 19.

NG

>> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or

ground. Refer to 

EC-1110, "Component Description"

.

19.

CHECK SYMPTOM MATRIX CHART

Check items on the rough idle symptom in 

EC-1373, "Symptom Matrix Chart"

.

OK or NG

OK

>> GO TO 20.

NG

>> Repair or replace.

20.

ERASE THE 1ST TRIP DTC

Some tests may cause a 1st trip DTC to be set.

Erase the 1st trip DTC from the ECM memory after performing the tests. Refer to 

EC-1005, "On Board Diag-

nosis Function"

 (Without CONSULT) or 

EC-1008, "CONSULT Function"

 (With CONSULT).

>> GO TO 21.

21.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Work Flow"

.

>> INSPECTION END

2.0 - 6.0 g/s:

at idling

7.0 - 20.0 g/s:

at 2,500 rpm

2.0 - 6.0 g/s:

at idling

7.0 - 20.0 g/s:

at 2,500 rpm

P0327, P0328, P0332, P0333 KS

EC-1193

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

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P0327, P0328, P0332, P0333 KS

Component Description

INFOID:0000000009481835

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:0000000009481836

The MIL will not illuminate for these diagnoses.

DTC Confirmation Procedure

INFOID:0000000009481837

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 10V at idle.
4. Start engine and run it for at least 5 seconds at idle speed.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to 

EC-1193, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009481838

1.

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 terminals 15, 36 and ground. Refer to Wiring Diagram.

NOTE:

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

Ω.

BBIA0547E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0327
0327
(Bank 1)

Knock sensor circuit low in-
put

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

• Harness or connectors

(The sensor circuit is open or shorted.)

• Knock sensor

P0332
0332
(Bank 2)

P0328
0328
(Bank 1)

Knock sensor circuit high in-
put

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

P0333
0333
(Bank 2)

Resistance: Approximately 532 - 588 k

Ω [at 20°C (68°F)]

EC-1194

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

P0327, P0328, P0332, P0333 KS

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

OK

>> GO TO 5.

NG

>> GO TO 2.

2.

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

1. Disconnect knock sensor harness connector.

2. Check harness continuity between ECM terminal 15 and knock

sensor (bank1) terminal 1, ECM terminal 36 and knock sensor

(bank 2) terminal 1. 

Refer to Wiring Diagram.

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

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors F67, F250

• Harness for open or short between ECM and knock sensor

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

4.

CHECK KNOCK SENSOR

Refer to 

EC-1195, "Component Inspection"

.

OK or NG

OK

>> GO TO 5.

NG

>> Replace malfunctioning knock sensor. Refer to 

EM-219, "Exploded View"

.

5.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

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

Refer to 

EC-1094, "Ground Inspection"

.

OK or NG

OK

>> GO TO 6.

NG

>> Repair or replace ground connections.

6.

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 ground. Refer to Wiring Diagram.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

Continuity should exist.

BBIA0547E

BBIA0539E

Continuity should exist.