Nissan Frontier D40. Manual - part 345

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-71

< FUNCTION DIAGNOSIS >

[QR25DE]

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*: The items are the same as those of 1st trip freeze frame data.

DATA MONITOR MODE

Monitored Item

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.

IN MANI PRES [kPa]

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

COMBUST CONDI-
TION

Freeze frame data 

item*

Description

Monitored item [Unit]

ECM 

INPUT 

SIG-

NALS

MAIN 

SIG-

NALS

Description

Remarks

ENG SPEED [rpm]

×

×

• Indicates the engine speed computed 

from the signals of the crankshaft position 
sensor (POS) and camshaft position sen-
sor (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.

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.

A/F ALPHA-B1 [%]

×

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

back correction factor per cycle is indicat-
ed.

• When the engine is stopped, a certain 

value is indicated.

• This data also includes the data for the 

air-fuel ratio learning control. 

COOLAN TEMP/S [

°

C] 

or [

°

F]

×

×

• The engine coolant temperature (deter-

mined by the signal voltage of the engine 
coolant temperature sensor) is displayed.

• When the engine coolant temperature 

sensor is open or short-circulated, ECM 
enters fail-safe mode. The engine coolant 
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.

HO2S2 (B1) [V]

×

• The signal voltage of the heated oxygen 

sensor 2 is displayed.

EC-72

< FUNCTION DIAGNOSIS >

[QR25DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

HO2S2 MNTR (B1) 
[RICH/LEAN]

×

• Display of heated oxygen sensor 2 signal:

RICH: Means the amount of oxygen after 
three way catalyst is relatively small.
LEAN: Means the amount of oxygen after 
three way catalyst is relatively large.

• When the engine is stopped, a certain 

value is indicated.

VHCL SPEED SE [km/
h] or [mph]

×

×

• The vehicle speed computed from the ve-

hicle speed signal sent from combination 
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 [V]

×

×

• The throttle position sensor signal voltage 

is displayed.

• TP SEN 2 signal is converted by ECM in-

ternally. Thus, it differs from ECM termi-
nal voltage signal.

TP SEN 2-B1 [V]

×

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 tem-
perature sensor) is indicated.

EVAP SYS PRES [V]

×

• The signal voltage of EVAP control sys-

tem pressure sensor is displayed.

FUEL LEVEL SE [V]

×

• The signal voltage of the fuel level sensor 

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.

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.

HEATER FAN SW [ON/
OFF]

×

• Indicates [ON/OFF] condition from the 

heater fan switch signal. 

BRAKE SW
[ON/OFF]

×

• Indicates [ON/OFF] condition from the 

stop lamp switch signal. 

Monitored item [Unit]

ECM 

INPUT 

SIG-

NALS

MAIN 

SIG-

NALS

Description

Remarks

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-73

< FUNCTION DIAGNOSIS >

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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.

IGN TIMING [BTDC]

×

• 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 airflow divided by peak 
airflow.

MASS AIRFLOW [g·m/
s]

• Indicates the mass airflow 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 value 

increases.

INT/V TIM (B1) [

°

CA]

• Indicates [

°

CA] of intake camshaft ad-

vanced angle. 

INT/V SOL (B1) [%]

• The control value of the intake valve tim-

ing control solenoid valve (determined by 
ECM according to the input signal) is indi-
cated. 

• The advance angle becomes larger as 

the value increases.

AIR COND RLY
[ON/OFF]

×

• The air conditioner relay control condition 

(determined by ECM according to the in-
put signals) is indicated.

FUEL PUMP RLY [ON/
OFF]

×

• Indicates the fuel pump relay control con-

dition determined by ECM according to 
the input signals.

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.

HO2S2 HTR (B1) [ON/
OFF]

• Indicates [ON/OFF] condition of heated 

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

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 

INPUT 

SIG-

NALS

MAIN 

SIG-

NALS

Description

Remarks

EC-74

< FUNCTION DIAGNOSIS >

[QR25DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

A/F S1 HTR (B1) [%]

• Indicates A/F sensor 1 heater control val-

ue computed by ECM according to the in-
put signals.

• The current flow to the heater becomes 

larger as the value increases.

AC PRESS SEN [V]

×

• The signal voltage from the refrigerant 

pressure sensor is displayed.

VHCL SPEED SE
[km/h] or [MPH]

×

• The vehicle speed computed from the ve-

hicle speed signal sent from TCM is dis-
played.

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, and ASCD clutch 
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.

• For M/T models always “OFF” is dis-

played.

AT OD CANCEL
[ON/OFF]

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

cancel signal sent from the TCM.

• For M/T models always “OFF” is dis-

played.

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.

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.

Monitored item [Unit]

ECM 

INPUT 

SIG-

NALS

MAIN 

SIG-

NALS

Description

Remarks