Nissan Frontier D22. Manual - part 250

TROUBLE DIAGNOSIS

EC-103

[KA24DE]

C

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EC

*: This function is not necessary in the usual service procedure.

SELF-DIAG RESULTS MODE
Self Diagnostic Item

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

EC-18, "INDEX FOR DTC"

 .

Freeze Frame Data and 1st Trip Freeze Frame Data

EVAP SYSTEM CLOSE

OPEN THE VACUUM CUT VALVE BYPASS VALVE AND 
CLOSE THE EVAP CANISTER VENT CONTROL VALVE IN 
ORDER TO MAKE EVAP SYSTEM CLOSE UNDER THE 
FOLLOWING CONDITIONS.

●

BATTERY VOLTAGE IS SUFFICIENT.

●

IGN SW “ON”

●

ENGINE NOT RUNNING

●

AMBIENT TEMPERATURE IS ABOVE 0

°C (32°F).

●

NO VACUUM AND NO HIGH PRESSURE IN EVAP SYS-
TEM

●

TANK FUEL 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 CONDITIONS ABOVE, CONSULT-II WILL 
DISCONTINUE AND DISPLAY INSTRUCTIONS.

NOTE:
WHEN STARTING ENGINE, CONSULT-II MAY DISPLAY 
“BATTERY VOLTAGE IS LOW. CHARGE BATTERY”, 
EVEN WHEN USING A CHARGED BATTERY.

When detecting EVAP vapor leak 
point of EVAP system

TARGET IDLE RPM ADJ*

●

IDLE CONDITION

When setting target idle speed

WORK ITEM

CONDITION

USAGE

Freeze frame data 

item*

Description

DIAG TROUBLE 
CODE
[PXXXX]

●

Engine Control component part/control system has a trouble code, it is displayed as “PXXXX”. (Refer to 

EC-18, "INDEX FOR DTC"

 .)

FUEL SYS-B1

●

“Fuel injection system status” at the moment a malfunction is detected is displayed.

●

 One mode in the following is displayed.
“Mode 2”: Open loop due to detected system malfunction
“Mode 3”: Open loop due to driving conditions (power enrichment, deceleration enleanment)
“Mode 4”: Closed loop - using oxygen sensor(s) as feedback for fuel control
“Mode 5”: Open loop - has not yet satisfied condition to go to closed loop

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.

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.

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.

ENGINE SPEED 
[rpm]

●

The engine speed at the moment a malfunction is detected is displayed.

VEHICLE 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 angle at the moment a malfunction is detected is displayed.

EC-104

[KA24DE]

TROUBLE DIAGNOSIS

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

DATA MONITOR MODE
Monitored Item

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.

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 REF signal (180

° signal) of the 

camshaft position sensor.

●

Accuracy becomes poor if engine 
speed drops below the idle rpm.

●

If the signal is interrupted while the 
engine 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 
[msec]

×

●

“Base fuel schedule” indicates the fuel 
injection pulse width programmed into 
ECM, prior to any learned on board cor-
rection.

A/F ALPHA-B1 [%]

×

●

Indicates the mean value of the air-fuel 
ratio feedback correction factor per cycle.

●

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-circuited, ECM 
enters fail-safe mode. The engine 
coolant temperature determined by 
the ECM is displayed.

HO2S1 (B1) [V]

×

×

●

The signal voltage of the heated oxygen 
sensor 1 is displayed.

HO2S2 (B1) [V]

×

×

●

The signal voltage of the heated oxygen 
sensor 2 is displayed.

HO2S1 MNTR (B1)
[RICH/LEAN]

×

●

Display of heated oxygen sensor 1 signal 
during air-fuel ratio feedback control:
RICH... means the mixture became “rich”, 
and control is being affected toward a 
leaner mixture.
LEAN... means the mixture became 
“lean”, and control is being affected 
toward a rich mixture.

●

After turning ON the ignition switch, 
“RICH” is displayed until air-fuel mix-
ture ratio feedback control begins.

●

When the air-fuel ratio feedback is 
clamped, the value just before the 
clamping is displayed continuously.

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 
vehicle speed sensor signal is displayed.

BATTERY VOLT [V]

×

×

●

The power supply voltage of ECM is dis-
played.

THRTL POS SEN [V]

×

×

●

The throttle position sensor signal voltage 
is displayed.

TROUBLE DIAGNOSIS

EC-105

[KA24DE]

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EC

FUEL T/TMP SE
[

°C] or [°F]

×

●

The fuel temperature judged from the fuel 
tank temperature sensor signal voltage is 
displayed.

INT/A TEMP SE
[

°C] or [°F]

×

×

●

The intake air temperature determined by 
the signal voltage of the intake air temper-
ature sensor is indicated.

EGR TEMP SEN [V]

×

×

●

The signal voltage of the EGR tempera-
ture sensor is displayed.

EVAP SYS PRES [V]

×

●

The signal voltage of EVAP control system 
pressure sensor is displayed.

FUEL LEVEL SE [V]

×

●

The signal voltage of the fuel level sensor 
is displayed.

START SIGNAL
[ON/OFF]

×

×

●

Indicates [ON/OFF] condition from the 
starter signal.

●

After starting the engine, [OFF] is dis-
played regardless of the starter signal.

CLSD THL POS
[ON/OFF]

×

×

●

Indicates idle position [ON/OFF] com-
puted by ECM according to the throttle 
position sensor signal.

CLSD THL/P SW
[ON/OFF]

×

●

Indicates mechanical contact [ON/OFF] 
condition of the closed throttle position 
switch.

AIR COND SIG
[ON/OFF]

×

×

●

Indicates [ON/OFF] condition of the air 
conditioner switch as determined by the 
air conditioning signal.

P/N POSI SW
[ON/OFF]

×

×

●

Indicates [ON/OFF] condition from the 
PNP switch signal.

PW/ST SIGNAL
[ON/OFF]

×

×

●

Indicates [ON/OFF] condition of the power 
steering oil pressure switch determined by 
the power steering oil pressure switch sig-
nal.

IGNITION SW
[ON/OFF]

×

●

Indicates [ON/OFF] condition from ignition 
switch.

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.

CAL/LD VALUE [%]

●

“Calculated load value” indicates the value 
of the current airflow divided by peak air-
flow.

ABSOL TH·P/S [%]

●

“Absolute throttle position sensor” indi-
cates the throttle opening computed by 
ECM according to the signal voltage of the 
throttle position sensor.

MASS AIRFLOW
[g·m/s]

●

Indicates the mass airflow computed by 
ECM according to the signal voltage of the 
mass air flow sensor.

IACV-AAC/V [%]

×

●

Indicates the IACV-AAC valve control 
value computed by ECM according to the 
input signals.

Monitored item [Unit]

ECM 

INPUT 

SIG-

NALS

MAIN 

SIG-

NALS

Description

Remarks

EC-106

[KA24DE]

TROUBLE DIAGNOSIS

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

PURG VOL C/V [%]

●

Indicates the EVAP canister purge volume 
control value computed by the ECM 
according to the input signals.

●

The opening becomes larger as the value 
increases.

AIR COND RLY
[ON/OFF]

×

●

Indicates the air conditioner relay control 
condition determined by ECM according 
to the input signals.

EGRC SOL/V
[ON/OFF]
(FLOW/CUT)

×

●

Indicates the control condition of the 
EGRC-solenoid valve determined by ECM 
according to the input signals.

●

ON... EGR valve is operational
OFF... EGR valve operation is cut-off

TCC SOL/V

●

Indicates [ON/OFF] condition of torque 
converter clutch solenoid valve deter-
mined by ECM according to the input sig-
nals.

FUEL PUMP RLY
[ON/OFF]

×

●

Indicates the fuel pump relay control con-
dition determined by ECM according to 
the input signals.

VC/V BYPASS/V
[ON/OFF]

●

 The control condition of the vacuum cut 
valve bypass valve (determined by ECM 
according to the input signal) is indicated.

●

ON... Open
OFF... Closed

VENT CONT/V
[ON/OFF]

●

The control condition of the EVAP canister 
vent control valve (determined by ECM 
according to the input signal) is indicated.

●

ON... Closed
OFF... Open

HO2S1 HTR (B1)
[ON/OFF]

●

Indicates [ON/OFF] condition of heated 
oxygen sensor 1 heater determined by 
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.

VOLTAGE [V]

●

Voltage measured by the voltage probe.

Frequency
[msec] or [Hz] or [%]

●

Pulse width, frequency or duty cycle mea-
sured by the pulse probe.

●

Only “#” is displayed if item is unable 
to be measured.

●

Figures with “#”s are temporary ones. 
They are the same figures as an 
actual piece of data which was just 
previously measured.

Monitored item [Unit]

ECM 

INPUT 

SIG-

NALS

MAIN 

SIG-

NALS

Description

Remarks