Nissan Titan A60. Instruction — part 346

EC-50

< SYSTEM DESCRIPTION >

[VK56DE]

DIAGNOSIS SYSTEM (ECM)

*1: This function is not necessary in the usual service procedure.
*2: For Flexible Fuel Vehicle

SELF-DIAG RESULTS MODE

Self Diagnostic Item

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

EC-72, "DTC Index"

.

How to Read DTC and 1st Trip DTC

DTCs and 1st trip DTCs related to the malfunction are displayed in “Self-diag results”.

• When ECM detects a 1st trip DTC, “1t” is displayed for “TIME”.

• When ECM has detected a current DTC, “0” is displayed for “TIME”.

• If “TIME” is neither “0” nor “1t”, the DTC occurred in the past and ECM shows the number of times the vehi-

cle has been driven since the last detection of the DTC.

How to Erase DTC and 1st Trip DTC

NOTE:

• If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10

seconds and then turn it ON (engine stopped) again.

• If the DTC is not for A/T related items (see

EC-72, "DTC Index"

), skip step 1.

1. Erase DTC in TCM. Refer to

TM-34, "Introduction"

.

2. Select “ENGINE” with CONSULT-III.

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 the coefficient of
self-learning control value

ETHANOL M/R ADJ*

2

• THIS FUNCTION ALLOWS THE ETHANOL MIXTURE

RATIO THAT THE ECM ESTIMATED TO BE CHANGED.
IMPROPER USAGE OF THIS FUNCTION MAY CAUSE
POOR DRIVEABILITY OR DECREASING FUEL ECONO-
MY. FOLLOW THE INSTRUCTION OF SERVICE MANU-
AL.

When adjusting the ethanol mix-
ture ratio to the specified value.

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 IN USING CHARGED BATTERY.

When detecting EVAP vapor leak
point of EVAP system

VIN REGISTRATION

• IN THIS MODE, VIN IS REGISTERED IN ECM

When registering VIN in ECM

TARGET IDLE RPM ADJ*

1

• IDLE CONDITION

When setting target idle speed

TARGET IGN TIM ADJ*

1

• IDLE CONDITION

When adjusting target ignition tim-
ing

DIAGNOSIS SYSTEM (ECM)

EC-51

< SYSTEM DESCRIPTION >

[VK56DE]

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3. Select “SELF-DIAG RESULTS”.

4. Touch “ERASE”. (DTC in ECM will be erased.)

Freeze Frame Data and 1st Trip Freeze Frame Data

*: The item is the same as that of 1st trip freeze frame data.

DATA MONITOR MODE

Monitored Item

Freeze frame data

item*

Description

DIAG TROUBLE
CODE
[PXXXX]

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

EC-72, "DTC Index"

.)

FUEL SYS-B1

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

ule.

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 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.

INT MANI PRES [kPa]
or [psi]

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

COMBUST CONDI-
TION

Monitored item

[Unit]

ECM IN-

PUT SIG-

NALS

MAIN

SIGNALS

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 en-

gine 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”.

EC-52

< SYSTEM DESCRIPTION >

[VK56DE]

DIAGNOSIS SYSTEM (ECM)

B/FUEL SCHDL
[ms]

×

×

• Base fuel schedule indicates the fuel in-

jection pulse width programmed into
ECM, prior to any learned on board cor-
rection.

• When engine is running specification

range is indicated in “SPEC”.

A/F ALPHA-B1 [%]

• The mean value of the air-fuel ratio feed-

back correction factor per cycle is indi-
cated.

• When the engine is stopped, a certain

value is indicated.

• When engine is running specification

range is indicated in “SPEC”.

• This data also includes the data for the

air-fuel ratio learning control.

A/F ALPHA-B2 [%]

COOLAN TEMP/S
[

°C] or [°F]

×

×

• The engine coolant temperature (deter-

mined by the signal voltage of the engine
coolant temperature sensor) is dis-
played.

• When the engine coolant temperature

sensor is open or short-circuited, ECM
enters fail-safe mode. The engine cool-
ant temperature determined by the ECM
is displayed.

A/F SEN1 (B1) [V]

×

×

• The A/F signal computed from the input

signal of the A/F sensor 1 is displayed.

A/F SEN1 (B2) [V]

×

×

HO2S2 (B1) [V]

×

×

• The signal voltage of the heated oxygen

sensor 2 is displayed.

HO2S2 (B2) [V]

×

×

HO2S2 MNTR(B1)
[RICH/LEAN]

×

• Display of heated oxygen sensor 2 sig-

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

• When the engine is stopped, a certain

value is indicated.

HO2S2 MNTR(B2)
[RICH/LEAN]

×

VHCL SPEED SE
[km/h] or [mph]

×

×

• The vehicle speed computed from the

vehicle speed signal sent from combina-
tion meter is displayed.

BATTERY VOLT
[V]

• The power supply voltage of ECM is dis-

played.

ACCEL SEN 1 [V]

• The accelerator pedal position sensor

signal voltage is displayed.

• ACCEL SEN 2 signal is converted by

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

ACCEL SEN 2 [V]

TP SEN 1-B1

×

×

• The throttle position sensor signal volt-

age is displayed.

• 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 tempera-
ture sensor) is displayed.

INT/A TEMP SE
[

°C] or [°F]

×

×

• The intake air temperature (determined

by the signal voltage of the intake air
temperature sensor) is indicated.

EVAP SYS PRES
[V]

• The signal voltage of EVAP control sys-

tem pressure sensor is displayed.

FPCM DR VOLT
[V]*

1

• The voltage between fuel pump and

FPCM is displayed.

FUEL LEVEL SE
[V]

×

• The signal voltage of the fuel level sen-

sor is displayed.

START SIGNAL
[ON/OFF]

• Indicates start signal status [ON/OFF]

computed by the ECM according to the
signals of engine speed and battery volt-
age.

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

played regardless of the starter signal.

Monitored item

[Unit]

ECM IN-

PUT SIG-

NALS

MAIN

SIGNALS

Description

Remarks

DIAGNOSIS SYSTEM (ECM)

EC-53

< SYSTEM DESCRIPTION >

[VK56DE]

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CLSD THL POS
[ON/OFF]

×

×

• Indicates idle position [ON/OFF] comput-

ed by ECM according to the accelerator
pedal position sensor signal.

AIR COND SIG
[ON/OFF]

×

×

• Indicates [ON/OFF] condition of the air

conditioner switch as determined by the
air conditioner signal.

P/N POSI SW
[ON/OFF]

×

×

• Indicates [ON/OFF] condition from the

park/neutral 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
signal) is indicated.

LOAD SIGNAL
[ON/OFF]

×

×

• Indicates [ON/OFF] condition from the

electrical load signal.
ON: Lighting switch is in 2nd position.
OFF: Lighting switch is OFF.

IGNITION SW
[ON/OFF]

×

×

• Indicates [ON/OFF] condition from igni-

tion switch signal.

HEATER FAN SW
[ON/OFF]

×

• Indicates [ON/OFF] condition from heat-

er 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 signals.

• When the engine is stopped, a certain

computed value is indicated.

INJ PULSE-B2
[msec]

IGN TIMING [BT-
DC]

• 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 val-

ue of the current air flow divided by peak
air flow.

MASS AIRFLOW
[g·/s]

• Indicates the mass air flow computed by

ECM according to the signal voltage of
the mass air flow sensor.

PURG VOL C/V [%]

• Indicates the EVAP canister purge vol-

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

• The opening becomes larger as the val-

ue increases.

INT/V TIM(B1)
[

°CA]

• Indicates [

°CA] of intake camshaft ad-

vanced angle.

INT/V TIM(B2)
[

°CA]

INT/V SOL(B1) [%]

• The control value of the intake valve tim-

ing control solenoid valve (determined by
ECM according to the input signals) is in-
dicated.

• The advance angle becomes larger as

the value increases.

INT/V SOL(B2) [%]

AIR COND RLY
[ON/OFF]

• The air conditioner relay control condi-

tion (determined by ECM according to
the input signals) is indicated.

Monitored item

[Unit]

ECM IN-

PUT SIG-

NALS

MAIN

SIGNALS

Description

Remarks