Nissan Altima L32. Instruction — part 253

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-133

< FUNCTION DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

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*: 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-112, "Diagnosis Description"

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SRT 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 Learn-

ing.

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”, “HI”

and “OFF” CONSULT-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

sensor

• 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 en-

gine at 1,500 rpm.

• Change the EVAP canister purge

volume control solenoid valve
opening percent using CON-
SULT-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 using

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

TUMBLE CONTROL
VALVE

• Ignition switch: ON
• Turn tumble control valve “ON”

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

Tumble control valve motor makes
an operating sound.

• Harness and connectors
• Tumble control valve motor

EC-134

< FUNCTION DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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

DTC WORK SUPPORT Mode

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

Diagnosis Tool Function

INFOID:0000000004349182

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-295

P0455

EC-330

EVP V/S LEAK P0456/P1456*

P0456

EC-336

A/F SEN1

A/F SEN1 (B1) P1278/P1279

P0133

EC-209

A/F SEN1 (B1) P1276

P0130

EC-199

HO2S2

HO2S2 (B1) P1146

P0138

EC-220

HO2S2 (B1) P1147

P0137

EC-214

HO2S2 (B1) P139

P0139

EC-228

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-527, "DTC Index"

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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.

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-135

< FUNCTION DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

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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

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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

EC-136

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

COMPONENT DIAGNOSIS

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Description

INFOID:0000000004349183

The specification (SP) value indicates the tolerance of the value that is displayed in “SPEC” of “DATA MONI-

TOR” mode of CONSULT-III during normal operation of the Engine Control System. When the value in “SPEC”

of “DATA MONITOR” mode is within the SP value, the Engine Control System is confirmed OK. When the

value in “SPEC” of “DATA MONITOR” mode is NOT within the SP value, the Engine Control System may have

one or more malfunctions.

The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the

MIL.

The SP value will be displayed for the following three items:

• B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correc-

tion)

• A/F ALPHA-B1 (The mean value of air-fuel ratio feedback correction factor per cycle)

• MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)

Component Function Check

INFOID:0000000004349184

1.

START

Make sure that all of the following conditions are satisfied.

• Vehicle driven distance: More than 5,000 km (3,107 miles)
• Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm

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, 14.25 - 15.12 psi)

• Atmospheric temperature: 20 - 30

°C (68 - 86°F)

• Engine coolant temperature: 75 - 95

°C (167 - 203°F)

• Transmission: Warmed-up

- CVT models: After the engine is warmed up to normal operating temperature, drive vehicle until “ATF TEMP

SEN” (CVT fluid temperature sensor signal) indicates more than 60

°C (140°F).

- M/T models: After the engine is warmed up to normal operating temperature, drive vehicle for 5 minutes.

• Electrical load: Not applied*

• Engine speed: Idle

*: Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight

ahead.

>> GO TO 2.

2.

PERFORM “SPEC” OF “DATA MONITOR” MODE

With CONSULT-III

NOTE:

Perform “SPEC” in “DATA MONITOR” mode in maximum scale display.

1. Perform

EC-24, "BASIC INSPECTION : Special Repair Requirement"

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2. Select “B/FUEL SCHDL”, “A/F ALPHA-B1” and “MAS A/F SE-B1” in “SPEC” of “DATA MONITOR” mode

with CONSULT-III.

3. Make sure that monitor items are within the SP value.
Is the inspection result normal?

YES

>> END

NO

>> Go to

EC-137, "Diagnosis Procedure"

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