Nissan Frontier. Manual — part 388

INSPECTION AND ADJUSTMENT

EC-123

< BASIC INSPECTION >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

>> GO TO 9.

9.

PERFORM IDLE AIR VOLUME LEARNING

Perform idle air volume learning. Refer to

EC-124, "Idle Air Volume Learning"

.

>> END

VIN Registration

INFOID:0000000009480758

DESCRIPTION

VIN Registration is an operation to registering VIN in ECM. It must be performed each time ECM is replaced.

NOTE:

Accurate VIN which is registered in ECM may be required for Inspection & Maintenance (I/M).

OPERATION PROCEDURE

With CONSULT

1. Check the VIN of the vehicle and note it. Refer to

GI-24, "Identification Number"

.

2. Turn ignition switch ON and engine stopped.
3. Select “VIN REGISTRATION” in “WORK SUPPORT” mode.
4. Follow the instruction of CONSULT display.

Accelerator Pedal Released Position Learning

INFOID:0000000009480759

DESCRIPTION

Accelerator Pedal Released Position Learning is an operation to learn the fully released position of the accel-

erator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time

the harness connector of the accelerator pedal position sensor or ECM is disconnected.

OPERATION PROCEDURE

1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch ON and wait at least 2 seconds.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON and wait at least 2 seconds.
5. Turn ignition switch OFF and wait at least 10 seconds.

Throttle Valve Closed Position Learning

INFOID:0000000009480760

DESCRIPTION

Throttle Valve Closed Position Learning is a function of ECM to learn the fully closed position of the throttle

valve by monitoring the throttle position sensor output signal. It must be performed each time the harness con-

nector of the electric throttle control actuator or ECM is disconnected or electric throttle control actuator inside

is cleaned.

OPERATION PROCEDURE

With CONSULT

1. Turn ignition switch ON.

2. Select “CLSD THL POS LEARN” in “WORK SUPPORT” mode of “ENGINE” using CONSULT.

3. Follow the instructions on the CONSULT display.

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

Check that throttle valve moves during the above 10 seconds by confirming the operating sound.

Without CONSULT

1. Start the engine.

NOTE:

Engine coolant temperature is 25

°C (77°F) or less before engine starts.

2. Warm up the engine.

NOTE:

Raise engine coolant temperature until it reaches 65

°C (149°F) or more.

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

EC-124

< BASIC INSPECTION >

[QR25DE]

INSPECTION AND ADJUSTMENT

Check that throttle valve moves during the above 10 seconds by confirming the operating sound.

Idle Air Volume Learning

INFOID:0000000009480761

DESCRIPTION

Idle Air Volume Learning is an operation to learn the idle air volume that keeps each engine within the specific

range. It must be performed under of the following conditions:

• Each time electric throttle control actuator or ECM is replaced.

• Idle speed or ignition timing is out of specification.

PREPARATION

Before performing Idle Air Volume Learning, make sure that all of the following conditions are satisfied.

Learning will be cancelled if any of the following conditions are missed for even a moment.

• Battery voltage: More than 12.9V (At idle)

• Engine coolant temperature: 70 - 95

°C (158 - 212°F)

• Selector lever position: P or N (A/T), Neutral (M/T)

• Electric load switch: OFF

(Air conditioner, headlamp)

On vehicles equipped with daytime light systems, if the parking brake is applied before the engine is

started the headlamp will not be illuminated.

• Steering wheel: Neutral (Straight-ahead position)

• Vehicle speed: Stopped

• Transmission: Warmed-up

- A/T models

• With CONSULT: Drive vehicle until “ATF TEMP SE 1” in “DATA MONITOR” mode of “A/T” system indicates

less than 0.9V.

• Without CONSULT: Drive vehicle for 10 minutes.

- M/T models: Drive vehicle for 10 minutes.

OPERATION PROCEDURE

With CONSULT

1. Perform

EC-123, "Accelerator Pedal Released Position Learning"

.

2. Perform

EC-123, "Throttle Valve Closed Position Learning"

.

3. Start engine and warm it up to normal operating temperature.
4. Check that all items listed under the topic PREPARATION (previously mentioned) are in good order.
5. Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.
6. Touch “START” and wait 20 seconds.
7. Make sure that “CMPLT” is displayed on CONSULT screen. If “CMPLT” is not displayed, Idle Air Volume

Learning will not be carried out successfully. In this case, find the cause of the incident by referring to the

DIAGNOSTIC PROCEDURE below.

8. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the

specifications. Refer to

EC-121, "Idle Speed and Ignition Timing Check"

.

Without CONSULT

NOTE:

• It is better to count the time accurately with a clock.

• It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has

a malfunction.

1. Perform

EC-123, "Accelerator Pedal Released Position Learning"

.

2. Perform

EC-123, "Throttle Valve Closed Position Learning"

.

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

ITEM

SPECIFICATION

Idle speed

M/T: 625

± 50 rpm (in Neutral position)

A/T: 700

± 50 rpm (in P or N position)

Ignition timing

M/T: 15

± 5° BTDC (in Neutral position)

A/T: 15

± 5° BTDC (in P or N position)

INSPECTION AND ADJUSTMENT

EC-125

< BASIC INSPECTION >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

4. Check that all items listed under the topic PREPARATION (previously mentioned) are in good order.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
7. Repeat the following procedure quickly 5 times within 5 seconds.
a. Fully depress the accelerator pedal.
b. Fully release the accelerator pedal.
8. Wait 7 seconds, fully depress the accelerator pedal for approx. 20 seconds until the MIL stops blinking

and turns ON.

9. Fully release the accelerator pedal within 3 seconds after the MIL turns ON.
10. Start engine and let it idle.
11. Wait 20 seconds.

12. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the

specifications. Refer to

EC-121, "Idle Speed and Ignition Timing Check"

.

13. If idle speed and ignition timing are not within the specification, Idle Air Volume Learning will not be carried

out successfully. In this case, find the cause of the incident by referring to the DIAGNOSTIC PROCE-

DURE below.

DIAGNOSTIC PROCEDURE

If idle air volume learning cannot be performed successfully, proceed as follows:
1. Check that throttle valve is fully closed.
2. Check PCV valve operation.
3. Check that downstream of throttle valve is free from air leakage.
4. When the above three items check out OK, engine component parts and their installation condi-

tion are questionable. Check and eliminate the cause of the incident.

It is useful to perform

EC-138

.

5. If any of the following conditions occur after the engine has started, eliminate the cause of the

incident and perform Idle Air Volume Learning all over again:

• Engine stalls.

• Erroneous idle.

ITEM

SPECIFICATION

Idle speed

M/T: 625

± 50 rpm (in Neutral position)

A/T: 700

± 50 rpm (in P or N position)

Ignition timing

M/T: 15

± 5° BTDC (in Neutral position)

A/T: 15

± 5° BTDC (in P or N position)

SEC897C

EC-126

< BASIC INSPECTION >

[QR25DE]

HOW TO SET SRT CODE

HOW TO SET SRT CODE

Description

INFOID:0000000009480762

OUTLINE

In order to set all SRTs, the self-diagnoses as in the “SRT ITEM” table must have been performed at least

once. Each diagnosis may require actual driving for a long period of time under various conditions.

SRT ITEM

The table below shows required self-diagnostic items to set the SRT to “CMPLT”.

• *1: Though displayed on the CONSULT screen, “HO2S HTR” is not SRT item.

• *2: If completion of several SRTs is required, perform driving patterns (DTC confirmation procedure), one by

one based on the priority for models with CONSULT.

SRT SERVICE PROCEDURE

If a vehicle has failed the state emissions inspection due to one or more SRT items indicating “INCMP”, review

the flowchart diagnostic sequence, referring to the following flowchart.

SRT item

*1

(CONSULT indication)

Performance

Priority

*2

Required self-diagnostic items to set the SRT to “CMPLT”

Corresponding

DTC No.

CATALYST

2

Three way catalyst function

P0420

EVAP SYSTEM

2

EVAP control system purge flow monitoring

P0441

1

EVAP control system

P0442

2

EVAP control system

P0456

HO2S

1

Air fuel ratio (A/F) sensor 1

P014C, P014D,
P015A, P015B

Heated oxygen sensor 2

P0137

Heated oxygen sensor 2

P0138

Heated oxygen sensor 2

P0139

EGR/VVT SYSTEM

3

Intake value timing control function

P0011