Nissan Frontier. Manual — part 372
DIAGNOSIS SYSTEM (ECM)
EC-59
< SYSTEM DESCRIPTION >
[QR25DE]
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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
1. Erase DTC in TCM. Refer to
2. Select “ENGINE” with CONSULT.
3. Select “SELF-DIAG RESULTS”.
4. Touch “ERASE”. (DTC in ECM will be erased.)
Freeze Frame Data and 1st Trip Freeze Frame Data
*: The items are the same as those of 1st trip freeze frame data.
DATA MONITOR MODE
NOTE:
• The following table includes information (items) inapplicable to this vehicle. For information (items) applica-
ble to this vehicle, refer to CONSULT display items.
• For reference values of the following items, refer to
EC-68, "CONSULT Reference Value in Data Monitor
Monitored Item
Freeze frame data
item*
Description
DIAG TROUBLE
CODE
[PXXXX]
• The engine control component part/control system has a trouble code, that is displayed as PXXXX. (Refer
.)
FUEL SYS-B1
• “Fuel injection system status” at the moment a malfunction is detected is displayed.
• One of in the following made 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 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.
INT MANI PRES [psi]
• Always a certain value is displayed.
• These items are displayed but are not applicable to this model.
COMBUST CONDI-
TION
EC-60
< SYSTEM DESCRIPTION >
[QR25DE]
DIAGNOSIS SYSTEM (ECM)
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 posi-
tion 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.
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 indi-
cated.
• 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 dis-
played.
• When the engine coolant temperature
sensor is open or short-circulated, 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.
HO2S2 (B1) [V]
×
×
• The signal voltage of the heated oxygen
sensor 2 is displayed.
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.
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 [V]
×
×
• The throttle position sensor signal volt-
age 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.
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 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.
DIAGNOSIS SYSTEM (ECM)
EC-61
< SYSTEM DESCRIPTION >
[QR25DE]
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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.
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.
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/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 val-
ue 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 in-
dicated.
• The advance angle 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 signals) is indicated.
FUEL PUMP RLY [ON/
OFF]
• Indicates the fuel pump relay control con-
dition determined by ECM according to
the input signals.
Monitored item [Unit]
ECM
INPUT
SIG-
NALS
MAIN
SIG-
NALS
Description
Remarks
EC-62
< SYSTEM DESCRIPTION >
[QR25DE]
DIAGNOSIS SYSTEM (ECM)
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.
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.
A/F S1 HTR (B1) [%]
• Indicates A/F sensor 1 heater control val-
ue computed by ECM according to the
input signals.
• 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 TCM 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 brake
pedal position switch signal, and clutch
pedal position switch signal.
BRAKE SW2
[ON/OFF]
• Indicates [ON/OFF] condition of stop
lamp switch signal.
Monitored item [Unit]
ECM
INPUT
SIG-
NALS
MAIN
SIG-
NALS
Description
Remarks
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