Nissan Frontier D22. Instruction — part 394
TROUBLE DIAGNOSIS
EC-679
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
*: 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
SIG-
NALS
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 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 [%]
×
●
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.
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 dis-
played.
●
When the engine coolant temperature
sensor is open or short-circuited, ECM
enters fail-safe mode. The engine cool-
ant temperature determined by the
ECM is displayed.
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]
×
×
EC-680
[VG33E]
TROUBLE DIAGNOSIS
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 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 certain
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 displayed.
BATTERY VOLT [V]
×
×
●
The power supply voltage of ECM is dis-
played.
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 volt-
age 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.
EGR TEMP SEN [V]
×
×
●
The signal voltage of the EGR tempera-
ture 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 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 conditioner signal.
P/N POSI SW
[ON/OFF]
×
×
●
Indicates [ON/OFF] condition from the
park/neutral position (PNP) switch signal.
PW/ST SIGNAL
[ON/OFF]
×
×
●
[ON/OFF] condition of the power steering
oil pressure switch determined by the
power steering oil pressure signal is indi-
cated.
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.
Monitored item [Unit]
ECM
INPUT
SIG-
NALS
MAIN
SIG-
NALS
Description
Remarks
TROUBLE DIAGNOSIS
EC-681
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
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.
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 certain
value is indicated.
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 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.
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
FUEL PUMP RLY
[ON/OFF]
×
●
Indicates the fuel pump relay control
condition 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 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 indi-
cated.
●
ON: Open
OFF: Closed
HO2S1 HTR (B1)
[ON/OFF]
●
Indicates [ON/OFF] condition of heated
oxygen sensors 1 heater determined by
ECM according to the input signals.
HO2S1 HTR (B1)
[ON/OFF]
Monitored item [Unit]
ECM
INPUT
SIG-
NALS
MAIN
SIG-
NALS
Description
Remarks
EC-682
[VG33E]
TROUBLE DIAGNOSIS
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
DATA MONITOR (SPEC) MODE
Monitored Items
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
ACTIVE TEST MODE
Test Item
HO2S2 HTR (B1)
[ON/OFF]
●
Indicates [ON/OFF] condition of heated
oxygen sensor 2 heaters determined by
ECM according to the input signals.
HO2S2 HTR (B2)
[ON/OFF]
VOLTAGE [V]
●
Voltage measured by the voltage probe.
FREQUENCY
[msec] or [Hz] or [%]
●
Pulse width, frequency or duty cycle
measured 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
Monitored item [Unit]
ECM
INPUT
SIG-
NALS
MAIN
SIG-
NALS
Description
Remarks
MAS A/F SE-B1 [V]
×
×
●
The signal voltage of the mass air flow sensor
specification is displayed.
●
When the engine is running, specifi-
cation range is indicated.
B/FUEL SCHDL
[msec]
×
●
“Base fuel schedule” indicates the fuel injec-
tion pulse width programmed into ECM, prior
to any learned on board correction.
●
When the engine is running, specifi-
cation range is indicated.
A/F ALPHA-B1 [%]
×
●
Indicates the mean value of the air-fuel ratio
feedback correction factor per cycle.
●
When the engine is running, specifi-
cation range is indicated.
●
This data also includes the data for
the air-fuel ratio learning control.
A/F ALPHA-B2 [%]
×
TEST ITEM
CONDITION
JUDGEMENT
CHECK ITEM (REMEDY)
FUEL INJEC-
TION
●
Engine: Return to the original
trouble condition
●
Change the amount of fuel injec-
tion using CONSULT-II.
If trouble symptom disappears, see
CHECK ITEM.
●
Harness and connector
●
Fuel injector
●
Heated oxygen sensor 1
IGNITION TIM-
ING
●
Engine: Return to the original
trouble condition
●
Timing light: Set
●
Retard the ignition timing using
CONSULT-II.
If trouble symptom disappears, see
CHECK ITEM.
●
Adjust initial ignition timing
IACV-AAC/V
OPENING
●
Engine: After warming up, idle
the engine.
●
Change the IACV-AAC valve
opening percent using CON-
SULT-II.
Engine speed changes according to
the opening percent.
●
Harness and connector
●
IACV-AAC valve
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