Nissan Altima L32. Instruction — part 385

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-661

< FUNCTION DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

ACTIVE TEST MODE

Test Item

BRAKE SW1

ON/OFF

• Indicates [ON/OFF] condition from ASCD brake

switch signal.

BRAKE SW2

ON/OFF

• Indicates [ON/OFF] condition of stop lamp switch

signal.

VHCL SPD CUT

NON/CUT

• Indicates the vehicle cruise condition.

NON: Vehicle speed is maintained at the ASCD
set speed.
CUT: Vehicle speed decreased to excessively
low compared with the ASCD set speed, and
ASCD operation is cut off.

LO SPEED CUT

NON/CUT

• Indicates the vehicle cruise condition.

NON: Vehicle speed is maintained at the ASCD
set speed.
CUT: Vehicle speed decreased to excessively
low, and ASCD operation is cut off.

AT OD MONITOR

ON/OFF

• Indicates [ON/OFF] condition of CVT O/D ac-

cording to the input signal from the TCM.

• For M/T models, always “OFF” is dis-

played.

AT OD CANCEL

ON/OFF

• Indicates [ON/OFF] condition of CVT O/D cancel

request signal.

• For M/T models, always “OFF” is dis-

played.

CRUISE LAMP

ON/OFF

• Indicates [ON/OFF] condition of CRUISE indica-

tor determined by the ECM according to the input
signals.

SET LAMP

ON/OFF

• Indicates [ON/OFF] condition of SET indicator

determined by the ECM according to the input
signals.

BAT CUR SEN

mV

• The signal voltage of battery current sensor is

displayed.

ALT DUTY SIG

ON/OFF

• The control condition of the power generation

voltage variable control (determined by ECM ac-
cording to the input signals) is indicated.
ON: Power generation voltage variable control is
active.
OFF: Power generation voltage variable control
is inactive.

A/F ADJ-B1

—

• Indicates the correction of factor stored in ECM.

The factor is calculated from the difference be-
tween the target air-fuel ratio stored in ECM and
the air-fuel ratio calculated from A/F sensor 1 sig-
nal.

ALT DUTY

%

• Indicates the duty ratio of the power generation

command value. The ratio is calculated by ECM
based on the battery current sensor signal.

Monitored item

Unit

Description

Remarks

EC-662

< FUNCTION DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

*: Leaving cooling fan OFF with CONSULT-III while engine is running may cause the engine to overheat.

DTC & SRT CONFIRMATION MODE

SRT STATUS Mode

For details, refer to

EC-641, "Diagnosis Description"

.

SRT WORK SUPPORT Mode

This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.

DTC WORK SUPPORT Mode

TEST ITEM

CONDITION

JUDGMENT

CHECK ITEM (REMEDY)

FUEL INJECTION

• Engine: Return to the original

trouble condition

• Change the amount of fuel injec-

tion using CONSULT-III.

If trouble symptom disappears, see
CHECK ITEM.

• Harness and connectors
• Fuel injector
• Air fuel ratio (A/F) sensor 1

IGNITION TIMING

• Engine: Return to the original

trouble condition

• Timing light: Set
• Retard the ignition timing using

CONSULT-III.

If trouble symptom disappears, see
CHECK ITEM.

• Perform Idle Air Volume Learning.

POWER BALANCE

• Engine: After warming up, idle

the engine.

• A/C switch OFF
• Shift lever: P or N (CVT), Neutral

(M/T)

• Cut off each fuel injector signal

one at a time using CONSULT-
III.

Engine runs rough or dies.

• Harness and connectors
• Compression
• Fuel injector
• Power transistor
• Spark plug
• Ignition coil

COOLING FAN*

• Ignition switch: ON
• Turn the cooling fan “LOW”,

“MID”, “HI” and “OFF” CON-
SULT-III.

Cooling fan moves and stops.

• Harness and connectors
• IPDM E/R (Cooling fan relay)
• Cooling fan motor

ENG COOLANT
TEMP

• Engine: Return to the original

trouble condition

• Change the engine coolant tem-

perature using CONSULT-III.

If trouble symptom disappears, see
CHECK ITEM.

• Harness and connectors
• Engine coolant temperature sen-

sor

• Fuel injector

FUEL PUMP RELAY

• Ignition switch: ON (Engine

stopped)

• Turn the fuel pump relay “ON”

and “OFF” using CONSULT-III
and listen to operating sound.

Fuel pump relay makes the operat-
ing sound.

• Harness and connectors
• Fuel pump relay

PURG VOL CONT/V

• Engine: After warming up, run

engine at 1,500 rpm.

• Change the EVAP canister

purge volume control solenoid
valve opening percent using
CONSULT-III.

Engine speed changes according
to the opening percent.

• Harness and connectors
• Solenoid valve

FUEL/T TEMP SEN

• Change the fuel tank temperature using CONSULT-III.

VENT CONTROL/V

• Ignition switch: ON (Engine

stopped)

• Turn solenoid valve “ON” and

“OFF” with the CONSULT-III and
listen to operating sound.

Solenoid valve makes an operating
sound.

• Harness and connectors
• Solenoid valve

V/T ASSIGN ANGLE

• Engine: Return to the original

trouble condition

• Change intake valve timing us-

ing CONSULT-III.

If trouble symptom disappears, see
CHECK ITEM.

• Harness and connectors
• Intake valve timing control sole-

noid valve

ALTERNATOR DUTY

• Engine: Idle
• Change duty ratio using CON-

SULT-III.

Battery voltage changes.

• Harness and connectors
• IPDM E/R
• Alternator

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-663

< FUNCTION DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

*: DTC P1442 and P1456 does not apply to L32 models but appears in DTC Work Support Mode screens.

Diagnosis Tool Function

INFOID:0000000004349635

DESCRIPTION

Generic Scan Tool (OBD II scan tool) complying with SAE J1978 has

several functions explained below.

ISO15765-4 is used as the protocol.

The name “GST” or “Generic Scan Tool” is used in this service man-

ual.

FUNCTION

Test mode

Test item

Corresponding DTC No.

Reference page

EVAPORATIVE SYSTEM

EVP SML LEAK P0442/P1442*

P0442

EC-801

P0455

EC-835

EVP V/S LEAK P0456/P1456*

P0456

EC-841

A/F SEN1

A/F SEN1 (B1) P1278/P1279

P0133

EC-734

A/F SEN1 (B1) P1276

P0130

EC-724

HO2S2

HO2S2 (B1) P1146

P0138

EC-745

HO2S2 (B1) P1147

P0137

EC-739

HO2S2 (B1) P139

P0139

EC-753

SEF139P

Diagnostic Service

Function

Service $01

READINESS TESTS

This diagnostic service gains access to current emission-related data values, including an-
alog inputs and outputs, digital inputs and outputs, and system status information.

Service $02

(FREEZE DATA)

This diagnostic service gains access to emission-related data value which were stored by
ECM during the freeze frame. For details, refer to

EC-1015, "DTC Index"

.

Service $03

DTCs

This diagnostic service gains access to emission-related power train trouble codes which
were stored by ECM.

Service $04

CLEAR DIAG INFO

This diagnostic service can clear all emission-related diagnostic information. This in-
cludes:
• Clear number of diagnostic trouble codes (Service $01)
• Clear diagnostic trouble codes (Service $03)
• Clear trouble code for freeze frame data (Service $01)
• Clear freeze frame data (Service $02)
• Reset status of system monitoring test (Service $01)
• Clear on board monitoring test results (Service $06 and $07)

Service $06

(ON BOARD TESTS)

This diagnostic service accesses the results of on board diagnostic monitoring tests of
specific components/systems that are not continuously monitored.

Service $07

(ON BOARD TESTS)

This diagnostic service enables the off board test drive to obtain test results for emission-
related powertrain components/systems that are continuously monitored during normal
driving conditions.

EC-664

< FUNCTION DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

INSPECTION PROCEDURE

1. Turn ignition switch OFF.
2. Connect “GST” to data link connector (2), which is located under

LH dash panel near the hood opener handle (1).

3. Turn ignition switch ON.

4. Enter the program according to instruction on the screen or in

the operation instruction.

(*: Regarding GST screens in this section, sample screens are

shown.)

5. Perform each diagnostic mode according to each service proce-

dure.

For further information, see the GST Operation Instruction of

the tool maker.

Service $08

—

This diagnostic service can close EVAP system in ignition switch ON position (Engine
stopped). When this diagnostic service is performed, EVAP canister vent control valve can
be closed.
In the following conditions, this diagnostic service cannot function.
• Low ambient temperature
• Low battery voltage
• Engine running
• Ignition switch OFF
• Low fuel temperature
• Too much pressure is applied to EVAP system

Service $09

(CALIBRATION ID)

This diagnostic service enables the off-board test device to request specific vehicle infor-
mation such as Vehicle Identification Number (VIN) and Calibration IDs.

Diagnostic Service

Function

ALBIA0047ZZ

SEF398S

SEF416S