Nissan Frontier D22. Manual - part 544

TROUBLE DIAGNOSIS

EC-1279

[VG33ER]

C

D

E

F

G

H

I

J

K

L

M

A

EC

WORK SUPPORT MODE
Work Item

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

SELF-DIAGNOSTIC MODE
Self Diagnostic Item

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

EC-1185, "INDEX FOR DTC"

 .

Freeze Frame Data and 1st Trip Freeze Frame Data

WORK ITEM

CONDITION

USAGE

TP SW/TP SEN IDLE POSI ADJ

●

FOLLOW THE BASIC INSPECTION INSTRUCTION IN 
THE SERVICE MANUAL.

When adjusting the idle throttle 
position

 IGNITION TIMING ADJ

●

IGNITION TIMING FEEDBACK CONTROL WILL BE 
HELD BY TOUCHING “START”. AFTER DOING SO, 
ADJUST IGNITION TIMING WITH A TIMING LIGHT BY 
TURNING THE CAMSHAFT POSITION SENSOR.

When adjusting target ignition tim-
ing
After adjustment, confirm target 
ignition timing with a timing light 
by turning the distributor.

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 clean the coefficient of self-
learning control valve

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.

●

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-
II WILL DISCONTINUE IT AND DISPLAY APPROPRIATE 
INSTRUCTION. 

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

When detecting EVAP vapor leak 
point of EVAP system

TARGET IDLE RPM ADJ*

SET ENGINE SPEED AT THE SPECIFIED VALUE UNDER 
THE FOLLOWING CONDITIONS.

●

ENGINE WARMED UP

●

NO LOAD

When adjusting initial ignition tim-
ing and idle speed

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-1185, "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

FUEL SYS-B2 

EC-1280

[VG33ER]

TROUBLE DIAGNOSIS

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

DATA MONITOR MODE
Monitored Item

×: Applicable

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 
schedule.

S-FUEL TRM-B2 [%]

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 [%]

ENGINE SPEED [rpm]

●

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

VHCL 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.

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 

SIGNALS

MAIN SIG-

NALS

Description

Remarks

ENG SPEED [rpm]

×

×

●

Indicates the engine speed computed 
from the REF signal (120

° signal) of the 

camshaft position sensor.

MAS A/F SE-B1 [V]

×

×

●

The signal voltage of the mass air flow 
sensor is displayed.

●

When the engine is stopped, a cer-
tain 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 [%]

×

●

The mean value of the air-fuel ratio 
feedback correction factor per cycle is 
indicated.

●

When the engine is stopped, a cer-
tain value is indicated.

●

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 
displayed.

●

When the engine coolant tempera-
ture sensor is open or short-cir-
cuited, ECM enters fail-safe mode. 
The engine coolant temperature 
determined by the ECM is dis-
played.

HO2S1 (B1) [V]

×

×

●

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

HO2S1 (B2) [V]

×

×

HO2S2 (B1) [V]

×

×

●

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

HO2S2 (B2) [V]

×

×

TROUBLE DIAGNOSIS

EC-1281

[VG33ER]

C

D

E

F

G

H

I

J

K

L

M

A

EC

HO2S1 MNTR (B1) 
[RICH/LEAN]

×

●

Display of heated oxygen sensor 1 sig-
nal during air-fuel ratio feedback con-
trol:
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 
mixture ratio feedback control 
begins.

●

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

HO2S1 MNTR (B2) 
[RICH/LEAN]

×

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 
after three way catalyst is relatively 
large.

●

When the engine is stopped, a cer-
tain value is indicated.

HO2S2 MNTR (B2) 
[RICH/LEAN]

 

×

VHCL SPEED SE
[km/h] or [mph]

×

×

●

The vehicle speed computed from the 
vehicle speed sensor signal is dis-
played.

BATTERY VOLT [V]

×

×

●

The power supply voltage of ECM is 
displayed.

THRTL POS SEN [V]

×

×

●

The throttle position sensor signal volt-
age is displayed.

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 
temperature sensor is indicated.

EVAP SYS PRES [V]

●

The signal voltage of EVAP control sys-
tem pressure sensor is displayed.

ABSOL PRES/SE [V]

●

The signal voltage of the absolute pres-
sure sensor is displayed.

FUEL LEVEL SE [V]

×

●

The signal voltage of the fuel level sen-
sor is displayed.

START SIGNAL
[ON/OFF]

×

×

●

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

●

After starting the engine, [OFF] is 
displayed 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 conditioner signal.

P/N POSI SW 
[ON/OFF]

×

×

●

Indicates [ON/OFF] condition from the 
park/neutral position (PNP) switch sig-
nal.

PW/ST SIGNAL 
[ON/OFF]

×

×

●

[ON/OFF] condition of the power steer-
ing oil pressure switch determined by 
the power steering oil pressure signal is 
indicated.

Monitored item [Unit]

ECM 

INPUT 

SIGNALS

MAIN SIG-

NALS

Description

Remarks

EC-1282

[VG33ER]

TROUBLE DIAGNOSIS

AMB TEMP SW 
[ON/OFF]

×

●

Indicates [ON/OFF] condition from the 
ambient air temperature switch signal.

IGNITION SW 
[ON/OFF]

×

●

Indicates [ON/OFF] condition from igni-
tion 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 cer-
tain computed value is indicated.

INJ PULSE-B2 
[msec]

IGN TIMING [BTDC]

×

●

Indicates the ignition timing computed 
by ECM according to the input signals. 

●

When the engine is stopped, a cer-
tain value is indicated.

CAL/LD VALUE [%]

●

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

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 airflow sensor.

IACV-AAC/V [%]

×

●

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

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.

AIR COND RLY 
[ON/OFF]

×

●

The air conditioner relay control condi-
tion (determined by ECM according to 
the input signal) is indicated.

FUEL PUMP RLY 
[ON/OFF]

×

●

Indicates the fuel pump relay control 
condition determined by ECM accord-
ing to the input signals.

VENT CONT/V 
[ON/OFF]

●

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

●

ON: Closed
OFF: Open

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

HO2S1 HTR (B1) 
[ON/OFF]

●

Indicates [ON/OFF] condition of heated 
oxygen sensor 1 heater determined by 
ECM according to the input signals.

HO2S1 HTR (B1) 
[ON/OFF]

Monitored item [Unit]

ECM 

INPUT 

SIGNALS

MAIN SIG-

NALS

Description

Remarks