Nissan Frontier. Manual - part 632

P0011, P0021 IVT CONTROL

EC-1099

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

C

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E

F

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EC

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6.

CHECK TIMING CHAIN INSTALLATION

Check service records for any recent repairs that may cause timing chain misalignment.

Are there any service records that may cause timing chain misalignment?
Yes or No

Yes

>> Check timing chain installation. Refer to 

EM-176, "Exploded View"

.

No

>> GO TO 7.

7.

CHECK LUBRICATION CIRCUIT

Refer to 

LU-21, "Lubrication Circuit"

.

OK or NG

OK

>> GO TO 8.

NG

>> Clean lubrication line.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009481740

INTAKE VALVE TIMING CONTROL SOLENOID VALVE

1. Disconnect intake valve timing control solenoid valve harness connector.
2. Check resistance between intake valve timing control solenoid

valve as follows.

If NG, replace intake valve timing control solenoid valve.

If OK, go to next step.

3. Remove intake valve timing control solenoid valve.

4. Provide 12V DC between intake valve timing control solenoid

valve terminals and then interrupt it. Check that the plunger

moves as shown in the figure.

CAUTION:

Never apply 12V DC continuously for 5 seconds or more.

Doing so may result in damage to the coil in intake valve

timing control solenoid valve.

If NG, replace intake valve timing control solenoid valve.

NOTE:

Always replace O-ring when intake valve timing control

solenoid valve is removed.

Terminal

Resistance

1 and 2

7.0 - 7.7

Ω at 20°C (68°F)

1 or 2 and ground

∞Ω

(Continuity should not exist.)

PBIB0193E

PBIB2275E

EC-1100

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

Description

INFOID:0000000009481741

SYSTEM DESCRIPTION

The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating

condition to keep the temperature of A/F sensor 1 element within the specified range.

On Board Diagnosis Logic

INFOID:0000000009481742

DTC Confirmation Procedure

INFOID:0000000009481743

NOTE:

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

least 10 seconds before conducting 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 between 10.5V and 16V at

idle.

1. Start engine and let it idle for at least 10 seconds.

2. Check 1st trip DTC.

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

EC-1100, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009481744

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

Sensor

Input Signal to ECM

ECM function

Actuator

Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)

Engine speed

Air fuel ratio (A/F) sensor 1 
heater control

Air fuel ratio (A/F) sensor 1 heater

Mass air flow sensor

Amount of intake air

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0031
0031
(Bank 1)

Air fuel ratio (A/F) sensor 
1 heater control circuit low

The current amperage in the A/F sensor 1 heater 
circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM 
through the A/F sensor 1 heater.)

• Harness or connectors

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

• A/F sensor 1 heater

P0051
0051
(Bank 2)

P0032
0032
(Bank 1)

Air fuel ratio (A/F) sensor 
1 heater control circuit 
high

The current amperage in the A/F sensor 1 heater 
circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM 
through the A/F sensor 1 heater.)

• Harness or connectors

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

• A/F sensor 1 heater

P0052
0052
(Bank 2)

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

EC-1101

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

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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 AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.

2. Turn ignition switch ON.

3. Check voltage between air fuel ratio sensor 1 terminal 4 and

ground with CONSULT or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E2, F32

• IPDM E/R harness connector E119

• 15 A fuse (No.54)

• Harness for open or short between air fuel ratio sensor 1 and fuse

>> Repair or replace harness or connectors.

4.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 2 (bank 1) or 24, 43 (bank 2) and air fuel ratio (A/F) sen-

sor 1 terminal 3.

Refer to Wiring Diagram.

4. Also check harness for short to ground or short to power.

BBIA0539E

Voltage: Battery voltage

BBIA0544E

PBIB3308E

Continuity should exist.

EC-1102

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

OK or NG

OK

>> GO TO 5.

NG

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

5.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER

Refer to 

EC-1102, "Component Inspection"

.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 7.

6.

CHECK INTERMITTENT INCIDENT

Perform 

GI-42, "Intermittent Incident"

.

OK or NG

OK

>> GO TO 7.

NG

>> Repair or replace.

7.

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to 

EM-147, "Exploded View"

.

CAUTION:

• Discard any air fuel ratio (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 air fuel ratio (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

Component Inspection

INFOID:0000000009481745

AIR FUEL RATIO (A/F) SENSOR 1 HEATER

1. Check resistance between A/F sensor 1 terminals as follows.

2. If NG, replace air fuel ratio (A/F) sensor 1.

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.

Terminal No.

Resistance

3 and 4

1.98 - 2.66 

Ω [at 25°C (77°F)]

3 and 1, 2

∞ Ω

(Continuity should not exist)

4 and 1, 2

PBIB3309E