Nissan Frontier. Manual - part 639

P0127 IAT SENSOR

EC-1127

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

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d. If the engine coolant temperature is not less than 96

°C (205°F), turn ignition switch OFF and cool down

engine.

• Perform the following steps before engine coolant temperature is above 96

°C (205°F).

2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode with CONSULT.
4. Start engine.
5. Hold vehicle speed at more than 70 km/h (43 MPH) for 100 consecutive seconds.
6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to 

EC-1127, "Diagnosis Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT” above.

Diagnosis Procedure

INFOID:0000000009481779

1.

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 2.

NG

>> Repair or replace ground connections.

2.

CHECK INTAKE AIR TEMPERATURE SENSOR

Refer to 

EC-1127, "Component Inspection"

.

OK or NG

OK

>> GO TO 3.

NG

>> Replace mass air flow sensor (with intake air temperature sensor). Refer to 

EM-141, "Exploded

View"

.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009481780

INTAKE AIR TEMPERATURE SENSOR

BBIA0539E

EC-1128

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

P0127 IAT SENSOR

1. Check resistance between intake air temperature sensor (1) ter-

minals 5 and 6 under the following conditions.

2. If NG, replace mass air flow sensor (with intake air temperature

sensor).

Intake air temperature 

°C (°F)

Resistance k

Ω

25 (77)

1.800 - 2.200

PBIA9559J

SEF012P

P0130, P0150 A/F SENSOR 1

EC-1129

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

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P0130, P0150 A/F SENSOR 1

Component Description

INFOID:0000000009481781

The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen-

sor. The sensor element of the A/F sensor 1 is composed an elec-

trode layer, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement   = 1, but also in the

lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide   range.

The exhaust gas components diffuse through the diffusion layer at

the sensor cell. An electrode layer is applied voltage, and this current

relative oxygen density in lean. Also this current relative hydrocar-

bon density in rich.

Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this

electrode layer of current. In addition, a heater is integrated in the

sensor to ensure the required operating temperature of about 800

°C

(1,472

°F).

On Board Diagnosis Logic

INFOID:0000000009481782

To judge the malfunctions, the diagnosis checks that the A/F signal computed by ECM from the air fuel ratio

(A/F) sensor 1 signal fluctuates according to fuel feedback control.

DTC Confirmation Procedure

INFOID:0000000009481783

Perform PROCEDURE FOR MALFUNCTION A first.

If the DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.

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 11V at idle.

PROCEDURE FOR MALFUNCTION A

1. Start engine and warm it up to normal operating temperature.

2. Let engine idle for 2 minutes.

3. Check 1st trip DTC.

4. If 1st trip DTC is detected, go to 

EC-1130, "Diagnosis Procedure"

.

JPBIA4038GB

PBIB3354E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P0130
0130
(Bank 1)

Air fuel ratio (A/F) sensor 1 
circuit

A)

The A/F signal computed by ECM from the A/F 
sensor 1 signal is constantly in a range other 
than approx. 2.2V.

• Harness or connectors

(The A/F sensor 1 circuit is open 
or shorted.)

• Air fuel ratio (A/F) sensor 1

P0150
0150
(Bank 2)

B)

The A/F signal computed by ECM from the A/F 
sensor 1 signal is constantly approx. 2.2V.

EC-1130

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

P0130, P0150 A/F SENSOR 1

PROCEDURE FOR MALFUNCTION B

CAUTION:

Always drive vehicle at a safe speed.

 With CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Select “A/F SEN1 (B1)” or “A/F SEN1 (B2)” in “DATA MONITOR” mode with CONSULT.

3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.

If the indication is constantly approx. 2.2V and does not fluctuates, go to 

EC-1130, "Diagnosis Procedure"

.

If the indication fluctuate around 2.2V, go to next step.

4. Select “A/F SEN1 (B1) P1276” (for DTC P0130) or “A/F SEN1 (B2) P1286” (for DTC P0150) of “A/F

SEN1” in “DTC WORK SUPPORT” mode with CONSULT.

5. Touch “START”.

6. When the following conditions are met, “TESTING” will be displayed on the CONSULT screen.

If “TESTING” is not displayed after 20 seconds, retry from step 2.

7. Release accelerator pedal fully.

NOTE:

Never apply brake when releasing the accelerator pedal.

8. Check that “TESTING” changes to “COMPLETED”.

If “TESTING” changed to “OUT OF CONDITION”, retry from step 6.

9. Check that “OK” is displayed after touching “SELF-DIAG RESULT”. 

If “NG” is displayed, go to 

EC-1130, "Diagnosis Procedure"

.

Overall Function Check

INFOID:0000000009481784

PROCEDURE FOR MALFUNCTION B

Use this procedure to check the overall function of the A/F sensor 1 circuit. During this check, a 1st trip DTC

might not be confirmed.

 With GST

1. Start engine and warm it up to normal operating temperature.

2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in the suitable gear position.

3. Set D position with “OD” OFF, then release the accelerator pedal fully until the vehicle speed decreases to

50 km/h (30 MPH).

NOTE:

Never apply brake during releasing the accelerator pedal.

4. Repeat steps 2 and 3 for five times.

5. Stop the vehicle and turn ignition switch OFF.

6. Turn ignition switch ON.

7. Turn ignition switch OFF and wait at least 10 seconds.

8. Restart engine.

9. Repeat steps 2 and 3 for five times.

10. Stop the vehicle and connect GST to the vehicle.

11. Check that no 1st trip DTC is displayed.

If the 1st trip DTC is displayed, go to 

EC-1130, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009481785

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

ENG SPEED

1,100 - 3,200 rpm

VHCL SPEED SE

More than 64 km/h (40 MPH)

B/FUEL SCHDL

1.0 - 8.0 msec

Shift lever

D position with “OD” OFF