2014 NISSAN TEANA ECU

EC-80
< SYSTEM DESCRIPTION >[QR25DE]
DIAGNOSIS SYSTEM (ECM)
TP SEN 1-B1
V××
• The throttle position sensor signal volt-age is displayed. • TP SEN 2-B1 signal is convert-
ed by ECM internally. Thus, it
differs from ECM terminal volt-
age signal.
TP SEN 2-B1
××
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 ו 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 displayed regardless of the
starter signal.
CLSD THL POS On/Off ×ו Indicates idle position [ON/OFF] comput-
ed by ECM according to the accelerator
pedal position sensor signal.
AIR COND SIG On/Off ×ו Indicates [ON/OFF] condition of the air
conditioner switch as determined by the
air conditioner signal.
PW/ST SIGNAL On/Off ×ו [ON/OFF] condition of the power steering
system (determined by the signal sent
from EPS control unit) is indicated.
LOAD SIGNAL On/Off ×ו Indicates [ON/OFF] condition from the
electrical load signal.
- On: Rear window defogger switch is ON and/or lighting switch is in 2nd position.
- Off: Both rear window defogger switch
and lighting switch are OFF.
IGNITION SW On/Off ×ו Indicates [ON/OFF] condition from igni-
tion switch signal.
HEATER FAN SW On/Off ו 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 indi-
cated.
IGN TIMING BTDC ו 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 air flow divided by peak
air flow.
MASS AIRFLOW g/s • Indicates the mass air flow computed by
ECM according to the signal voltage of
the mass air flow sensor.
Monitored item Unit
Monitor Item
Selection
Description Remarks
ECU
IN-
PUT
SIG-
NALS MAIN
SIG-
NAL S
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

DIAGNOSIS SYSTEM (ECM)EC-81
< SYSTEM DESCRIPTION > [QR25DE]
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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-
vance angle.
EXH/V TIM B1 °CA • Indicates [
°CA] of exhaust camshaft ad-
vance angle.
INT/V SOL(B1) %• The control value of the intake valve tim-
ing control solenoid valve (determined by
ECM according to the input signals) is in-
dicated.
• The advance angle becomes larger as
the value increases.
SWRL CONT S/V On/Off • The control condition of the intake mani-
fold runner control valve (determined by
ECM according to the input signals) is in-
dicated.
- On: Closed
- Off: Open
VIAS S/V-1 On/Off • The control condition of the intake mani-
fold tuning valve (determined by ECM ac-
cording to the input signals) is indicated.
- On: Closed
- Off: Open
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.
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.
COOLING FAN Hi/Mid/Low/Off • Indicates the condition of the cooling fan
(determined by ECM according to the in-
put signals).
- Hi: High speed operation
- Mid: Middle speed operation
- Low: Low speed operation
- Off: Stop
HO2S2 HTR (B1) On/Off • Indicates [ON/OFF] condition of heated
oxygen sensor 2 heater determined by
ECM according to the input signals.
Monitored item Unit
Monitor Item
Selection
Description Remarks
ECU
IN-
PUT
SIG-
NALS MAIN
SIG-
NAL S
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-82
< SYSTEM DESCRIPTION >[QR25DE]
DIAGNOSIS SYSTEM (ECM)
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 • The vehicle speed computed from the
vehicle speed signal sent from TCM is
displayed.
IDL A/V LEARN YET/CMPLT • Displays 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.
ENG OIL TEMP °C or °F • The engine oil temperature (determined
by the signal voltage of the engine oil
temperature sensor) is displayed.
A/F S1 HTR(B1) % • Air fuel ratio (A/F) sensor 1 heater control
value 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 combina-
tion meter 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.
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 decreased to exces- sively low compared with the ASCD set
speed, and ASCD operation is cut off.
Monitored item Unit
Monitor Item
Selection
Description Remarks
ECU
IN-
PUT
SIG-
NALS MAIN
SIG-
NAL S
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

DIAGNOSIS SYSTEM (ECM)EC-83
< SYSTEM DESCRIPTION > [QR25DE]
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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, and ASCD operation is cut off.
AT OD MONITOR On/Off • Indicates [ON/OFF] condition of CVT O/
D according to the input signal from the
TCM.
AT OD CANCEL On/Off • Indicates [ON/OFF] condition of CVT O/
D cancel request signal.
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 calu-
culated by ECM based on the battery
current sensor signal.
BAT CUR SEN mV • The signal voltage of battery current sen-
sor is displayed.
A/F ADJ-B1 — • Indicates the correction of factor stored in
ECM. The factor is calculated from the
difference between the target air-fuel ra-
tio stored in ECM and the air-fuel ratio
calculated from A/F sensor 1 signal.
TUMBLE POS SEN V • The intake manifold runner control valve
position sensor signal voltage is dis-
played.
P/N POSI SW On/Off ×ו Indicates [ON/OFF] condition from the
park/neutral position (PNP) signal.
INT/A TEMP SE °C or °F ×× • The intake air temperature (determined
by the signal voltage of the intake air tem-
perature senso r) is indicated.
AC PRESS SEN V • The signal voltage from the refrigerant
pressure sensor is displayed.
VTC DTY EX B1 % • The control value of the exhaust valve
timing control solenoid valve (determined
by ECM according to the input signals) is
indicated.
• The advance angle becomes larger as the value increases.
EVAP LEAK DIAG YET/CMPLT • Indicates the condition of EVAP leak di-
agnosis.
YET: EVAP leak diagnosis has not been
performed yet.
CMPLT: EVAP leak diagnosis has been
performed successfully.
Monitored item Unit
Monitor Item
Selection
Description Remarks
ECU
IN-
PUT
SIG-
NALS MAIN
SIG-
NAL S
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-84
< SYSTEM DESCRIPTION >[QR25DE]
DIAGNOSIS SYSTEM (ECM)
*: The item is indicated, but not used.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
EVAP DIAG
READY ON/OFF • Indicates the ready condition of EVAP
leak diagnosis.
ON: Diagnosis has been ready condition.
OFF: Diagnosis has not been ready con-
dition.
BAT TEMP SEN V • The signal voltage of battery temperature
sensor is displayed.
EOP SENSOR mV • The signal voltage of battery temperature
sensor is displayed.
THRTL STK CNT
B1
*——
A/F SEN1
DIAG1(B1) INCMP/CM-
PLT • Indicates DTC P015A or P015B self-di-
agnosis condition.
- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.
A/F SEN1
DIAG2(B1) INCMP/CM-
PLT • Indicates DTC P014C or P014D self-di-
agnosis condition.
- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.
A/F SEN1
DIAG3(B1) ABSNT/
PRSNT • Indicates DTC P014C, P014D, P015A or
P015B self-diagnosis condition.
- ABSNT: The vehicle co ndition is not with-
in the diagnosis range.
- PRSNT: The vehicle condition is within the diagnosis range.
HO2 S2 DIAG1
(B1) INCMP/CM-
PLT • Indicates DTC P0139 self-diagnosis (de-
layed response) condition.
- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.
HO2 S2 DIAG2
(B1) INCMP/CM-
PLT • Indicates DTC P0139 self-diagnosis
(slow response ) condition.
- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.
SYSTEM 1 DIAG-
NOSIS A B1 INCMP/CM-
PLT • Indicates DTC P117A self-diagnosis con-
dition.
- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.
SYSTEM 1 DIAG-
NOSIS B B1 ABSNT/
PRSNT • Indicates DTC P117A self-diagnosis con-
dition.
- ABSNT: Self-diagnosis standby
- PRSNT: Under self-diagnosis
A/F-S ATMSPHRC
CRCT B1 —Displays a determined value of atmospher-
ic correction factor necessary for correcting
an A/F sensor signal input to ECM. The sig-
nal used for the correction is an A/F sensor
signal transmitted while driving under atmo-
spheric pressure.
A/F-S ATMSPHRC
CRCT UP B1 count Displays the number of updates of the A/F
sensor atmospheric correction factor.
Monitored item Unit
Monitor Item
Selection
Description Remarks
ECU
IN-
PUT
SIG-
NALS MAIN
SIG-
NAL S
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

DIAGNOSIS SYSTEM (ECM)EC-85
< SYSTEM DESCRIPTION > [QR25DE]
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WORK SUPPORT MODE
Work Item
*: This function is not necessary in the usual service procedure.
ACTIVE TEST MODE
Test Item
Work item Condition Usage
IDLE AIR VOL LEARN • The idle air volume that keeps the engine within the spec- ified range is memorized in ECM. When learning the idle air volume
EVAP SYSTEM CLOSE Close the EVAP canister vent control valve in order to make
EVAP system close under the following conditions.
• Ignition switch ON
• Engine not running
• Ambient temperature is above 0 °C (32 °F).
• No vacuum and no high pressure in EVAP system
• Fuel tank temp is more than 0 °C (32 °F).
• Within 10 minutes after starting “EVAP SYSTEM CLOSE”
• When trying to execute “EVAP SYSTEM CLOSE” under the condition except above, CONSULT will discontinue it
and display appropriate instruction.
NOTE:
When starting engine, CONSULT may display “BAT-
TERY VOLTAGE IS LOW. CHARGE BATTERY”, even in
when using a charged battery. When detecting EVAP vapor leak
in the EVAP system
FUEL PRESSURE RELEASE • Fuel pump will st op by touching “START” during idling.
Crank a few times after engine stalls. When releasing fuel pressure from
fuel line
TARGET IGN TIM ADJ* • Idle condition When adjusting target ignition tim- ing
TARGET IDLE RPM ADJ* • Idle condition When setting target idle speed
VIN REGISTRATION • In this mode , VIN is registered in ECM. When registering VIN in ECM
SELF-LEARNING CONT • The coefficient of self-learning control mixture ratio returns to the original coefficient. When clearing mixture ratio self-
learning value
CLSD THL POS LEARN • Ignition on and engine stopped. When learning the throttle valve
closed position
SAVING DATA FOR REPLC CPU In th is mode, save data that is in ECM. When ECM is replaced.
WRITING DATA FOR REPLC CPU In this mode, write data stored by “SAVE DATA FOR CPU
REPLC” in work support mode to ECM. When ECM is replaced.
Test item Condition Judgment Check item (Remedy)
FUEL INJECTION • Engine: Return to the original
trouble condition
• Change the amount of fuel injec- tion using CONSULT. If trouble symptom disappears, see
CHECK ITEM. • Harness and connectors
• Fuel injector
• Air fuel ratio (A/F) sensor 1
ENG COOLANT
TEMP • Engine: Return to the original
trouble condition
• Change the engine coolant tem- perature using CONSULT. If trouble symptom disappears, see
CHECK ITEM. • Harness and connectors
• Engine coolant temperature
sensor
• Fuel injector
PURG VOL CONT/V • Engine: After warming up, run en-
gine at 1,500 rpm.
• Change the EVAP canister purge volume control solenoid valve
opening percent using CON-
SULT. Engine speed changes according
to the opening percent. • Harness and connectors
• Solenoid valve
FUEL/T TEMP SEN • Change the fuel tank temperature using CONSULT.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-88
< ECU DIAGNOSIS INFORMATION >[QR25DE]
ECM
ECU DIAGNOSIS INFORMATION
ECM
Reference ValueINFOID:0000000009462121
VALUES ON THE DIAGNOSIS TOOL
NOTE:
• The following table includes information (items) inapplicable to this vehicle. For information (items) applica- ble to this vehicle, refer to CONSULT display items.
• Numerical values in the following table are reference values.
• These values are input/output values that ECM receiv es/transmits and may differ from actual operations.
Example: The ignition timing shown by the timing light may differ from the ignition timing displayed on the
data monitor.
This occurs because the timing light shows a value calculated by ECM according to signals received from
the camshaft position sensor and other sensors related to ignition timing.
• For outlines of following items, refer to EC-77, "CONSULT Function"
.
Monitor Item Condition Values/Status
ENG SPEED • Run engine and compare CONSULT value with the tachometer indication.Almost the same speed as
the tachometer indication.
MAS A/F SE-B1 See EC-196, "Diagnosis Procedure"
.
B/FUEL SCHDL See EC-196, "Diagnosis Procedure"
.
A/F ALPHA-B1 See EC-196, "Diagnosis Procedure"
.
COOLAN TEMP/S • Engine: After warming up More than 70 °C (158 °F)
A/F SEN1 (B1) • Engine: After warming up Maintaining engine speed at 2,000 rpm Fluctuates around 2.2 V
HO2S2 (B1) • Revving engine from idle up to 3,000 rpm quickly after the following conditions
are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load 0 - 0.3 V
←→ Approx. 0.6 -
1.0 V
HO2S2 MNTR(B1) • Revving engine from idle up to 3,000 rpm quickly after the following conditions
are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load LEAN
←→ RICH
VHCL SPEED SE • Turn drive wheels and compare CONSULT value with the speedometer indi-
cation. Almost the same speed as
speedometer indication
BATTERY VOLT • Ignition switch: ON (Engine stopped) 11 - 14 V
ACCEL SEN 1 • Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released 0.5 - 1.0 V
Accelerator pedal: Fully depressed 4.2 - 4.8 V
ACCEL SEN 2*
1• Ignition switch: ON (Engine stopped) Accelerator pedal: Fully released 0.5 - 1.0 V
Accelerator pedal: Fully depressed 4.2 - 4.8 V
TP SEN 1-B1 • Ignition switch: ON
(Engine stopped)
• Selector lever: D Accelerator pedal: Fully re
leased More than 0.36 V
Accelerator pedal: Fully depressed Less than 4.75 V
TP SEN 2-B1*
1• Ignition switch: ON (Engine stopped)
• Selector lever: D Accelerator pedal: Fully released Less than 4.75 V
Accelerator pedal: Fully depressed More than 0.36 V
FUEL T/TMP SE • Ignition switch: ON Indicates fuel tank tempera-
ture
EVAP SYS PRES • Ignition switch: ON Approx. 1.8 - 4.8 V
FUEL LEVEL SE • Ignition switch: ON Depending on fuel level of
fuel tank
START SIGNAL • Ignition switch: ON → START → ON Off → On → Off
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ECM
EC-89
< ECU DIAGNOSIS INFORMATION > [QR25DE]
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CLSD THL POS
• Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released On
Accelerator pedal: Slightly depressed Off
AIR COND SIG • Engine: After warming up, idle the
engine Air conditioner switch: OFF Off
Air conditioner switch: ON
(Compressor operates.) On
PW/ST SIGNAL • Engine: After warming up, idle the
engine Steering wheel: Not being turned Off
Steering wheel: Being turned On
LOAD SIGNAL • Ignition switch: ON Rear window defogger switch: ON
and/or Lighting switch: 2nd position On
Rear window defogger switch and lighting
switch: OFF Off
IGNITION SW • Ignition switch: ON → OFF → ON On → Off → On
HEATER FAN SW • Engine: After warming up, idle the
engine Heater fan switch: ON On
Heater fan switch: OFF Off
BRAKE SW • Ignition switch: ON Brake pedal: Fully released Off
Brake pedal: Slightly depressed On
INJ PULSE-B1 • Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
•No load Idle 2.0 - 3.0 msec
2,000 rpm 1.9 - 2.9 msec
IGN TIMING • Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
•No load Idle 5
° - 15 ° BTDC
2,000 rpm 25 ° - 45 ° BTDC
CAL/LD VALUE • Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
•No load Idle 10% - 35%
2,500 rpm 10% - 35%
MASS AIRFLOW • Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
•No load Idle 1.0 - 4.0 g/s
2,500 rpm 4.0 - 10.0 g/s
PURG VOL C/V • Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
•No load Idle
(Accelerator pedal: Not depressed even
slightly, after engine starting.) 0%
2,000 rpm 20% - 90%
INT/V TIM(B1) • Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
•No load Idle
−5 ° - 5 °CA
4,000 rpm Approx. 0 ° - 30 °CA
EXH/V TIM B1 • Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
•No load Idle
−5 ° - 5 °CA
2,000 rpm Approx. 0 ° - 40 °CA
INT/V SOL (B1) • Engine: Idle speed
• Selector lever: P or N
• Air conditioner switch: OFF
•No load After warming up 0%
Cold condition [Engine coolant tempera-
ture below 60 °C (140 °F)] Approx. 50% - 100%
SWRL CONT S/V • Ignition switch: ON
• Engine coolant temperature: Be- tween -12 °C (10 °F) and 59 °C
(138 °F) Accelerator pedal: Fully released On
Accelerator pedal: Fully depressed Off
Monitor Item Condition Values/Status
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM