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Nissan Altima L32. Manual - part 383

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-653

< FUNCTION DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

Explanation for Driving Patterns Except for “Misfire <Exhaust Quality Deterioration>”, “Fuel Injection System”

*1: When the same malfunction is de-

tected in two consecutive trips, MIL
will light up.

*2: MIL will go off after vehicle is driven 3

times (pattern B) without any mal-
functions.

*3: When the same malfunction is de-

tected in two consecutive trips, the
DTC and the freeze frame data will be
stored in ECM.

*4: The DTC and the freeze frame data

will not be displayed any longer after
vehicle is driven 40 times (pattern A)
without the same malfunction.
(The DTC and the freeze frame data
still remain in ECM.)

*5: When a malfunction is detected for

the first time, the 1st trip DTC and the
1st trip freeze frame data will be
stored in ECM.

*6: 1st trip DTC will be cleared after vehi-

cle is driven once (pattern B) without
the same malfunction.

*7: When the same malfunction is de-

tected in the 2nd trip, the 1st trip
freeze frame data will be cleared.

SEF393SD

EC-654

< FUNCTION DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

• The A counter will be cleared when the malfunction is detected regardless of (1) - (4).

• The A counter will be counted up when (1) - (4) are satisfied without the same malfunction.

• The DTC will not be displayed after the A counter reaches 40.

Driving pattern B means the vehicle operation as follows:

All components and systems should be monitored at least once by the OBD system.

• The B counter will be cleared when the malfunction is detected once regardless of the driving pattern.

• The B counter will be counted up when driving pattern B is satisfied without any malfunctions.

• The MIL will go off when the B counter reaches 3 (*2 in OBD SYSTEM OPERATION CHART).

CONSULT-III Function

INFOID:0000000004349634

FUNCTION

*: The following emission-related diagnostic information is cleared when the ECM memory is erased.
• Diagnostic trouble codes
• 1st trip diagnostic trouble codes
• Freeze frame data
• 1st trip freeze frame data
• System readiness test (SRT) codes
• Test values

ENGINE CONTROL COMPONENT PARTS/CONTROL SYSTEMS APPLICATION

AEC574

Diagnostic test mode

Function

Work support

This mode enables a technician to adjust some devices faster and more accurately by following the in-
dications on the CONSULT-III unit.

Self-diagnostic results

Self-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data
can be read and erased quickly.*

Data monitor

Input/Output data in the ECM can be read.

Active test

Diagnostic Test Mode in which CONSULT-III drives some actuators apart from the ECMs and also shifts
some parameters in a specified range.

DTC & SRT confirmation

The status of system monitoring tests and the self-diagnosis status/result can be confirmed.

Function test

This mode is used to inform customers when their vehicle condition requires periodic maintenance.

ECU part number

ECM part number can be read.

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-655

< FUNCTION DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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

GINE

CON

L COMPONENT

ARTS

INPUT

Crankshaft position sensor (POS)

Camshaft position sensor (PHASE)

Mass air flow sensor

Engine coolant temperature sensor

Air fuel ratio (A/F) sensor 1

Heated oxygen sensor 2

Vehicle speed sensor

Accelerator pedal position sensor

Throttle position sensor

Fuel tank temperature sensor

EVAP control system pressure sensor

Intake air temperature sensor

Knock sensor

Refrigerant pressure sensor

Closed throttle position switch (accel-
erator pedal position sensor signal)

Air conditioner switch

Park/neutral position (PNP) switch

Stop lamp switch

Power steering pressure sensor

Battery voltage

Load signal

Primary speed sensor

Fuel level sensor

Battery current sensor

ASCD steering switch

ASCD brake switch

EC-656

< FUNCTION DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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-641, "Diagnosis Description"

*3: Always “CMPLT” is displayed.

WORK SUPPORT MODE

Work Item

ENGINE CONTROL COMPON

T P

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

×*

Heated oxygen sensor 2 heater

×*

EVAP canister vent control valve

Intake valve timing control solenoid
valve

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

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