Nissan Altima L32. Instruction — part 509

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-1157

< FUNCTION DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-III screen in freeze frame data
mode only if a 1st trip DTC or DTC is detected. For details, refer to

EC-1142, "Diagnosis Description"

.

*3: Always “CMPLT” is displayed.

WORK SUPPORT MODE

Work Item

ENGINE CONTROL COMPO

N

E

N

T P

A

R

T

S

OU

T

P

U

T

Fuel injector

×

×

Power transistor (Ignition timing)

×

×

Throttle control motor relay

×

×

Throttle control motor

×

EVAP canister purge volume control
solenoid valve

×

×

×

×

Air conditioner relay

×

Fuel pump relay

×

×

×

Cooling fan relay

×

×

×

Air fuel ratio (A/F) sensor 1 heater

×

×

×*

3

Heated oxygen sensor 2 heater

×

×

×*

3

EVAP canister vent control valve

×

×

×

×

Intake valve timing control solenoid
valve

×

×

×

VIAS control solenoid valve 1

×

×

×

VIAS control solenoid valve 2

×

×

×

Electronic controlled engine mount

×

×

Alternator

×

×

Calculated load value

×

×

Item

DIAGNOSTIC TEST MODE

WORK

SUPPORT

SELF-DIAGNOSTIC

RESULTS

DATA

MONI-

TOR

ACTIVE

TEST

DTC & SRT

CONFIRMATION

DTC*1

FREEZE

FRAME
DATA*2

SRT STA-

TUS

DTC

WORK

SUP-

PORT

WORK ITEM

CONDITION

USAGE

FUEL PRESSURE RELEASE

• FUEL PUMP WILL STOP BY TOUCHING “START” DUR-

ING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS.

When releasing fuel pressure from
fuel line

IDLE AIR VOL LEARN

• THE IDLE AIR VOLUME THAT KEEPS THE ENGINE

WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM.

When learning the idle air volume

SELF-LEARNING CONT

• THE COEFFICIENT OF SELF-LEARNING CONTROL

MIXTURE RATIO RETURNS TO THE ORIGINAL COEF-
FICIENT.

When clearing mixture ratio self-
learning value

EC-1158

< FUNCTION DIAGNOSIS >

[VQ35DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

*: This function is not necessary in the usual service procedure.

SELF-DIAG RESULTS MODE

Self Diagnostic Item

Regarding items of DTC and 1st trip DTC, refer to

EC-1555, "DTC Index"

.

Freeze Frame Data and 1st Trip Freeze Frame Data

EVAP SYSTEM CLOSE

CLOSE THE EVAP CANISTER VENT CONTROL VALVE IN
ORDER TO MAKE EVAP SYSTEM CLOSE UNDER THE
FOLLOWING CONDITIONS.
• IGN SW ON
• ENGINE NOT RUNNING
• AMBIENT TEMPERATURE IS ABOVE 0

°C (32°F).

• NO VACUUM AND NO HIGH PRESSURE IN EVAP SYS-

TEM

• FUEL TANK TEMP. IS MORE THAN 0

°C (32°F).

• WITHIN 10 MINUTES AFTER STARTING “EVAP SYS-

TEM CLOSE”

• WHEN TRYING TO EXECUTE “EVAP SYSTEM CLOSE”

UNDER THE CONDITION EXCEPT ABOVE, CONSULT-
III WILL DISCONTINUE IT AND DISPLAY APPROPRI-
ATE INSTRUCTION.
NOTE:
WHEN STARTING ENGINE, CONSULT-III MAY DIS-
PLAY “BATTERY VOLTAGE IS LOW. CHARGE BAT-
TERY”, EVEN WHEN IN USING A CHARGED BATTERY.

When detecting EVAP vapor leak-
age in the EVAP system

VIN REGISTRATION

• IN THIS MODE, VIN IS REGISTERED IN ECM.

When registering VIN in ECM

TARGET IDLE RPM ADJ*

• IDLE CONDITION

When setting target idle speed

TARGET IGN TIM ADJ*

• IDLE CONDITION

When adjusting target ignition tim-
ing

WORK ITEM

CONDITION

USAGE

Freeze frame data item*

Description

DIAG TROUBLE CODE
[PXXXX]

• The engine control component part/control system has a trouble code that is displayed as PXXXX. (Refer

to

EC-1555, "DTC Index"

.)

FUEL SYS-B1

• “Fuel injection system status” at the moment a malfunction is detected is displayed.
• One of the following mode is displayed.

Mode2: Open loop due to detected system malfunction
Mode3: Open loop due to driving conditions (power enrichment, deceleration enleanment)
Mode4: Closed loop - using oxygen sensor(s) as feedback for fuel control
Mode5: Open loop - has not yet satisfied condition to go to closed loop

FUEL SYS-B2

CAL/LD VALUE [%]

• The calculated load value at the moment a malfunction is detected is displayed.

COOLANT TEMP [

°C] or

[

°F]

• The engine coolant temperature at the moment a malfunction is detected is displayed.

L-FUEL TRM-B1 [%]

• “Long-term fuel trim” at the moment a malfunction is detected is displayed.
• The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule

than short-term fuel trim.

L-FUEL TRM-B2 [%]

S-FUEL TRM-B1 [%]

• “Short-term fuel trim” at the moment a malfunction is detected is displayed.
• The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel

schedule.

S-FUEL TRM-B2 [%]

ENGINE SPEED [rpm]

• The engine speed at the moment a malfunction is detected is displayed.

VEHICL SPEED
[km/h] or [mph]

• The vehicle speed at the moment a malfunction is detected is displayed.

ABSOL TH·P/S [%]

• The throttle valve opening angle at the moment a malfunction is detected is displayed.

B/FUEL SCHDL [msec]

• The base fuel schedule at the moment a malfunction is detected is displayed.

INT/A TEMP SE [

°C] or

[

°F]

• The intake air temperature at the moment a malfunction is detected is displayed.

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-1159

< FUNCTION DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

*: The items are the same as those of 1st trip freeze frame data.

DATA MONITOR MODE

Monitored Item

×: Applicable

INT MANI PRES [kPa]

• These items are displayed but are not applicable to this model.

COMBUST CONDITION

Freeze frame data item*

Description

Monitored item

Unit

Description

Remarks

ENG SPEED

rpm

• Indicates the engine speed computed from the

signal of the crankshaft position sensor (POS)
and camshaft position sensor (PHASE).

• Accuracy becomes poor if engine

speed drops below the idle rpm.

• If the signal is interrupted while the

engine is running, an abnormal value
may be indicated.

MAS A/F SE-B1

V

• The signal voltage of the mass air flow sensor is

displayed.

• When the engine is stopped, a certain

value is indicated.

• When engine is running, specification

range is indicated in “SPEC”.

B/FUEL SCHDL

msec

• “Base fuel schedule” indicates the fuel injection

pulse width programmed into ECM, prior to any
learned on board correction.

• When engine is running, specification

range is indicated in “SPEC”.

A/F ALPHA-B1

%

• The mean value of the air-fuel ratio feedback cor-

rection factor per cycle is indicated.

• When the engine is stopped, a certain

value is indicated.

• This data also includes the data for

the air-fuel ratio learning control.

• When engine is running, specification

range is indicated in “SPEC”.

A/F ALPHA-B2

COOLAN TEMP/S

°C or °F

• The engine coolant temperature (determined by

the signal voltage of the engine coolant tempera-
ture sensor) is displayed.

• When the engine coolant temperature

sensor is open or short-circuited,
ECM enters fail-safe mode. The en-
gine coolant temperature determined
by the ECM is displayed.

A/F SEN1 (B1)

V

• The A/F signal computed from the input signal of

the air fuel ratio (A/F) sensor 1 is displayed.

A/F SEN1 (B2)

HO2S2 (B1)

V

• The signal voltage of the heated oxygen sensor 2

is displayed.

HO2S2 (B2)

HO2S2 MNTR(B1)

RICH/LEAN

• Display of heated oxygen sensor 2 signal:

RICH: means the amount of oxygen after three
way catalyst is relatively small.
LEAN: means the amount of oxygen after three
way catalyst is relatively large.

• When the engine is stopped, a certain

value is indicated.

HO2S2 MNTR(B2)

VHCL SPEED SE

km/h or mph

• The vehicle speed computed from the vehicle

speed signal sent from combination meter is dis-
played.

BATTERY VOLT

V

• The power supply voltage of ECM is displayed.

ACCEL SEN 1

V

• The accelerator pedal position sensor signal volt-

age is displayed.

• ACCEL SEN 2 signal is converted by

ECM internally. Thus, it differs from
ECM terminal voltage signal.

ACCEL SEN 2

TP SEN 1-B1

V

• The throttle position sensor signal voltage is dis-

played.

• TP SEN 2-B1 signal is converted by

ECM internally. Thus, it differs from
ECM terminal voltage signal.

TP SEN 2-B1

FUEL T/TMP SE

°C or °F

• The fuel temperature (determined by the signal

voltage of the fuel tank temperature sensor) is
displayed.

EC-1160

< FUNCTION DIAGNOSIS >

[VQ35DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

INT/A TEMP SE

°C or °F

• The intake air temperature (determined by the

signal voltage of the intake air temperature sen-
sor) is indicated.

EVAP SYS PRES

V

• The signal voltage of EVAP control system pres-

sure sensor is displayed.

FUEL LEVEL SE

V

• The signal voltage of the fuel level sensor is dis-

played.

START SIGNAL

ON/OFF

• Indicates start signal status [ON/OFF] computed

by the ECM according to the signals of engine
speed and battery voltage.

• After starting the engine, [OFF] is dis-

played regardless of the starter sig-
nal.

CLSD THL POS

ON/OFF

• Indicates idle position [ON/OFF] computed by

ECM according to the accelerator pedal position
sensor signal.

AIR COND SIG

ON/OFF

• Indicates [ON/OFF] condition of the air condition-

er switch as determined by the air conditioner sig-
nal.

P/N POSI SW

ON/OFF

• Indicates [ON/OFF] condition from the park/neu-

tral position (PNP) signal.

PW/ST SIGNAL

ON/OFF

• [ON/OFF] condition of the power steering system

(determined by the signal voltage of the power
steering pressure sensor) is indicated.

LOAD SIGNAL

ON/OFF

• Indicates [ON/OFF] condition from the electrical

load signal.
ON: Rear window defogger switch is ON and/or
lighting switch is in 2nd position.
OFF: Both rear window defogger switch and light-
ing switch are OFF.

IGNITION SW

ON/OFF

• Indicates [ON/OFF] condition from ignition switch

signal.

HEATER FAN SW

ON/OFF

• Indicates [ON/OFF] condition from the heater fan

switch signal.

BRAKE SW

ON/OFF

• Indicates [ON/OFF] condition from the stop lamp

switch signal.

INJ PULSE-B1

msec

• Indicates the actual fuel injection pulse width

compensated by ECM according to the input sig-
nals.

• When the engine is stopped, a certain

computed value is indicated.

INJ PULSE-B2

IGN TIMING

BTDC

• Indicates the ignition timing computed by ECM

according to the input signals.

• When the engine is stopped, a certain

value is indicated.

CAL/LD VALUE

%

• “Calculated load value” indicates the value of the

current air flow divided by peak air flow.

MASS AIRFLOW

gm/s

• Indicates the mass air flow computed by ECM ac-

cording to the signal voltage of the mass air flow
sensor.

PURG VOL C/V

%

• Indicates the EVAP canister purge volume con-

trol solenoid valve control value computed by the
ECM according to the input signals.

• The opening becomes larger as the value in-

creases.

INT/V TIM (B1)

°CA

• Indicates [

°CA] of intake camshaft advance an-

gle.

INT/V TIM (B2)

INT/V SOL-B1

%

• The control value of the intake valve timing con-

trol solenoid valve (determined by ECM accord-
ing to the input signals) is indicated.

• The advance angle becomes larger as the value

increases.

INT/V SOL-B2

Monitored item

Unit

Description

Remarks