Nissan Titan. Instruction — part 188

DIAGNOSIS SYSTEM (ECM)

EC-53

< SYSTEM DESCRIPTION >

[VK56DE]

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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.

FUEL PUMP RLY
[ON/OFF]

• Indicates the fuel pump relay control con-

dition determined by ECM according to
the input signals.

FPCM
[HI/LOW]*1

• The control condition of the fuel pump

control module (FPCM) (determined by
the ECM according to the input signals)
is indicated.

VENT CONT/V
[ON/OFF]

• The control condition of the EVAP canis-

ter vent control valve (determined by
ECM according to the input signals) is in-
dicated.
ON: Closed
OFF: Open

THRTL RELAY
[ON/OFF]

• Indicates the throttle control motor relay

control condition determined by the ECM
according to the input signals.

A/F S1 HTR(B2)
[%]

• A/F sensor 1 heater control value com-

puted by ECM according to the input sig-
nals.

• The current flow to the heater becomes

larger as the value increases.

HO2S2 HTR (B1)
[ON/OFF]

• Indicates [ON/OFF] condition of heated

oxygen sensor 2 heater determined by
ECM according to the input signals.

HO2S2 HTR (B2)
[ON/OFF]

ALT DUTY SIG
[ON/OFF]

• The control condition of the power gener-

ation voltage variable control (deter-
mined by ECM according to the input
signals) is indicated.
ON: Power generation voltage variable
control is active.
OFF: Power generation voltage variable
control is inactive.

I/P PULLY SPD
[rpm]

• Indicates the engine speed computed

from the input speed sensor signal.

VEHICLE SPEED
[km/h] or [mph]

• Indicates the vehicle speed computed

from the output speed sensor signal.

IDL A/V LEARN
[YET/CMPLT]

• Display the condition of Idle Air Volume

Learning
YET: Idle Air Volume Learning has not
been performed yet.
CMPLT: Idle Air Volume Learning has al-
ready been performed successfully.

TRVL AFTER MIL
[km] or [mile]

• Distance traveled while MIL is activated.

Monitored item

[Unit]

ECM IN-

PUT SIG-

NALS

MAIN

SIGNALS

Description

Remarks

EC-54

< SYSTEM DESCRIPTION >

[VK56DE]

DIAGNOSIS SYSTEM (ECM)

A/F S1 HTR(B1)
[%]

• A/F sensor 1 heater control value com-

puted by ECM according to the input sig-
nals.

• The current flow to the heater becomes

larger as the value increases.

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

• The vehicle speed computed from the

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

SET VHCL SPD
[km/h] or [mph]

• The preset vehicle speed is displayed.

MAIN SW
[ON/OFF]

• Indicates [ON/OFF] condition from MAIN

switch signal.

CANCEL SW
[ON/OFF]

• Indicates [ON/OFF] condition from CAN-

CEL switch signal.

RESUME/ACC SW
[ON/OFF]

• Indicates [ON/OFF] condition from RE-

SUME/ACCELERATE switch signal.

SET SW
[ON/OFF]

• Indicates [ON/OFF] condition from SET/

COAST switch signal.

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 increased to exces-
sively high 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 exces-
sively low compared with the ASCD set
speed, and ASCD operation is cut off.

AT OD MONITOR
[ON/OFF]

• Indicates [ON/OFF] condition of A/T O/D

according to the input signal from the
TCM.

AT OD CANCEL
[ON/OFF]

• Indicates [ON/OFF] condition of A/T O/D

cancel signal sent from the TCM.

CRUISE LAMP
[ON/OFF]

• Indicates [ON/OFF] condition of CRUISE

lamp determined by the ECM according
to the input signals.

SET LAMP
[ON/OFF]

• Indicates [ON/OFF] condition of SET

lamp determined by the ECM according
to the input signals.

ETHANOL M/R
[%]*1

• Ethanol mixture ratio presumed by the

ECM according to the input signals is dis-
played.

ALT DUTY [%]

• Indicates the duty ratio of the power gen-

eration command value. The ratio is cal-
culated by ECM based on the battery
current sensor signal.

BAT CUR SEN
[mV]

• The signal voltage of battery current sen-

sor is displayed.

Monitored item

[Unit]

ECM IN-

PUT SIG-

NALS

MAIN

SIGNALS

Description

Remarks

DIAGNOSIS SYSTEM (ECM)

EC-55

< SYSTEM DESCRIPTION >

[VK56DE]

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A/F ADJ-B1

• Indicates the correction factor stored in

ECM. The factor is calculated from the
difference between the target air/fuel ra-
tio stored in ECM and the air-fuel ratio
calculated from air fuel ratio (A/F) sensor
1 signal.

A/F ADJ-B2

P/N POSI SW
[ON/OFF]

×

×

• Indicates [ON/OFF] condition from the

park/neutral position (PNP) signal.

INT/A TEMP SE
[

°C] or [°F]

×

×

• The intake air temperature (determined

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

AC PRESS SEN [V]

• The signal voltage from the refrigerant

pressure sensor is displayed.

A/F SEN1 (B2) [V]

×

×

• The A/F signal computed from the input

signal of the A/F sensor 1 is displayed.

VTC DTY EX B2
[%]

—

FPCM DR VOLT
[V]*1

• The voltage between fuel pump and

FPCM is displayed.

THRTL STK CNT
B1

*2

—

HO2 S2 DIAG2
(B1)

*2

[INCMP/CMPLT]

• Indicates DTC P0139 self-diagnosis

(slow response) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

HO2 S2 DIAG2
(B2)

*2

[INCMP/CMPLT]

• Indicates DTC P0159 self-diagnosis

(slow response) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

EVAP LEAK DIAG

• Indicates the condition of EVAP leak di-

agnosis.
YET: EVAP leak diagnosis has not been
performed yet.
CMPLT: EVAP leak diagnosis has been
performed successfully.

EVAP DIAG
READY

• Indicates the ready condition of EVAP

leak diagnosis.
ON: Diagnosis has been ready condition.
OFF: Diagnosis has not been ready con-
dition.

A/F SEN1
DIAG2(B1)

*2

• Indicates DTC P0133 self-diagnosis con-

dition.
INCMP:Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

A/F SEN1
DIAG2(B2)

*2

• Indicates DTC P0153 self-diagnosis con-

dition.
INCMP:Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

A/F-S ATMSPHRC
CRCT B1

Displays a determined value of atmospher-
ic correction factor necessary for correcting
an A/F sensor signal input to ECM. The sig-
nal used for the correction is an A/F sensor
signal transmitted while driving under at-
mospheric pressure.

Monitored item

[Unit]

ECM IN-

PUT SIG-

NALS

MAIN

SIGNALS

Description

Remarks

EC-56

< SYSTEM DESCRIPTION >

[VK56DE]

DIAGNOSIS SYSTEM (ECM)

NOTE:

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

*1: For Flexible Fuel Vehicle

*2: The item is indicated, but not used.

WORK SUPPORT MODE

Work Item

A/F-S ATMSPHRC
CRCT B2

Displays a determined value of atmospher-
ic correction factor necessary for correcting
an A/F sensor signal input to ECM. The sig-
nal used for the correction is an A/F sensor
signal transmitted while driving under at-
mospheric pressure.

A/F-S ATMSPHRC
CRCT UP B1
[count]

Displays the number of updates of the A/F
sensor atmospheric correction factor.

A/F-S ATMSPHRC
CRCT UP B2
[count]

Displays the number of updates of the A/F
sensor atmospheric correction factor.

Monitored item

[Unit]

ECM IN-

PUT SIG-

NALS

MAIN

SIGNALS

Description

Remarks

WORK ITEM

CONDITION

USAGE

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

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
WILL DISCONTINUE IT AND DISPLAY APPROPRIATE
INSTRUCTION.
NOTE:
WHEN STARTING ENGINE, CONSULT MAY DISPLAY
“BATTERY VOLTAGE IS LOW. CHARGE BATTERY”,
EVEN IN USING CHARGED BATTERY.

When detecting EVAP vapor leak
point of EVAP system

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

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

TARGET IDLE RPM ADJ*

1

• IDLE CONDITION

When setting target idle speed

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.

VIN REGISTRATION

• IN THIS MODE, VIN IS REGISTERED IN ECM

When registering VIN in ECM