sport mode NISSAN TEANA 2014 Service Manual

MWI
COMBINATION METERMWI-27
< ECU DIAGNOSIS INFORMATION >
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O PFail-SafeINFOID:0000000009461695
FA I L - S A F E
The combination meter activates the fail-safe contro l if CAN communication with each unit is malfunctioning.
DTC IndexINFOID:0000000009461696
52
(P) Ground O/D OFF/SPORT switch Input Ignition
switch
ON O/D OFF switch pressed 0 V
Other than the above 5 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
Function Specifications
Speedometer Reset to zero by suspending communication.
Tachometer
Engine coolant temperature gauge
Illumination control When suspending communication, changes to nighttime mode.
Information display Odo/trip meter An indicated value is maintained at communications blackout.
Shift position indicator The display turns OFF by suspending communication.
Warning messages The display turns OFF by suspending communication.
Buzzer The buzzer turns OFF by suspending communication.
Warning lamp/indicator lamp ABS warning lamp
The lamp turns ON by suspending communication.
O/D OFF indicator lamp
Slip indicator lamp
Brake warning lamp
Malfunction indicator lamp
VDC OFF indicator lamp
EPS warning lamp
Low tire pressure warning lamp The lamp blinking caused by suspending communication.
High beam indicator lamp
The lamp turns OFF by suspending communication.
Turn signal indicator lamp
Master warning lamp
Front lamp indicator lamp
Lane departure warning
Tail lamp indicator lamp
Air bag warning lamp
The lamp turns off when disconnected.
Charge warning lamp
Seat belt warning lamp
Security indicator lamp
Display contents of CONSULT Diagnostic item is detected when... Refer to
CAN COMM CIRCUIT
[U1000] When combination meter is not transmitting or receiving CAN communication signal for 2
seconds or more. MWI-53
CONTROL UNIT (CAN)
[U1010] When detecting error during the initial diagnosis of the CAN controller of combination
meter. MWI-54
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

TM-46
< SYSTEM DESCRIPTION >[CVT: RE0F10D]
DIAGNOSIS SYSTEM (TCM)
TRGT PRI PRESSURE (MPa)Displays the target oil pressure of the primary pressure
solenoid valve calculated from oil pressure processing of
gear shift control.
TRGT SELECT PRESSURE (MPa) Displays the target oil pressure of the select solenoid
valve calculated from oil pressure processing of gear
shift control.
TRGT SEC PRESSURE (MPa) Displays the target oil pressure of the secondary pres-
sure solenoid valve calculated from oil pressure process-
ing of gear shift control.
ISOLT1 (A) ×Displays the command current from TCM to the torque
converter clutch solenoid valve.
ISOLT2 (A) ×Displays the command current from TCM to the line
pressure solenoid valve.
PRI SOLENOID (A) ×Displays the command current from TCM to the primary
pressure solenoid valve.
SEC SOLENOID CURRENT (A) ×Displays the command current from TCM to the second-
ary pressure solenoid valve.
SELECT SOLENOID CUR-
RENT (A)
×Displays the command current from TCM to the select
solenoid valve.
SOLMON1 (A) ××Monitors the command current from TCM to the torque
converter clutch solenoid valve and displays the moni-
tored value.
SOLMON2 (A) ××Monitors the command current from TCM to the line
pressure solenoid valve and displays the monitored val-
ue.
PRI SOL MON (A) ××Monitors the command current from TCM to the primary
pressure solenoid valve and displays the monitored val-
ue.
SEC SOL MON CURRENT (A) ××Monitors the command current from TCM to the second-
ary pressure solenoid valve and displays the monitored
value.
SELECT SOL MON CURRENT (A) ××Monitors the command current from TCM to the select
solenoid valve and displays the monitored value.
D POSITION SW (On/Off) ×Displays the operation status of the transmission range
switch (D position).
N POSITION SW (On/Off) ×Displays the operation status of the transmission range
switch (N position).
R POSITION SW (On/Off) ×Displays the operation status of the transmission range
switch (R position).
P POSITION SW (On/Off) ×Displays the operation status of the transmission range
switch (P position).
L POSITION SW* (On/Off) ×Displays the operation status of the transmission range
switch (L position).
DS RANGE SW (On/Off) ×Displays the operation status of the transmission range
switch (Ds position).
BRAKESW (On/Off) ××Displays the reception status of the stop lamp switch sig-
nal received through CAN communication.
IDLE SW (On/Off) ××Displays the reception status of the closed throttle posi-
tion signal received through CAN communication.
SPORT MODE SW (On/Off) ××Displays the reception status of the overdrive control
switch signal received through CAN communication.
Monitored item (Unit)
Monitor item selection
Remarks
ECU IN-
PUT SIG-
NALS MAIN SIG-
NALS
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

DIAGNOSIS SYSTEM (TCM)TM-47
< SYSTEM DESCRIPTION > [CVT: RE0F10D]
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ECO MODE SW* (On/Off) ××Displays the reception status of the ECO mode switch
signal received through CAN communication.
STRDWNSW* (On/Off) ×Displays the operation status of the paddle shifter (down
switch).
STRUPSW* (On/Off) ×Displays the operation status of the paddle shifter (up
switch).
DOWNLVR* (On/Off) ×Displays the operation status of the selector lever (down
switch).
UPLVR* (On/Off) ×Displays the operation status of the selector lever (up
switch).
NONMMODE* (On/Off) ×Displays if the selector lever position is not at the manual
shift gate.
MMODE* (On/Off) ×Displays if the selector lever position is at the manual
shift gate.
TOW MODE SW* (On/Off) ×Displays the reception status of the TOW mode switch
signal received through CAN communication.
SHIFT IND SIGNAL Displays the transaxle value of shift position signal trans-
mitted via CAN communication.
CVT LAMP* (On/Off) Displays the transaxle status of the CVT warning lamp
signal transmitted through CAN communication.
SPORT MODE IND (On/Off) Displays the transaxle status of the O/D OFF indicator
lamp signal transmitted through CAN communication.
MANU MODE SIGNAL* (On/Off) Displays the transaxle status of the manual mode signal
transmitted through CAN communication.
DS RANGE SIGNAL (On/Off) Displays the shift position signal status from transmis-
sion range switch (DS position).
ECO MODE SIGNAL* (On/Off) Displays the transaxle status of the ECO mode signal
transmitted through CAN communication.
VDC ON (On/Off) ×Displays the reception status of the VDC operation signal
received through CAN communication.
TCS ON (On/Off) ×Displays the reception status of the TCS operation signal
received through CAN communication.
ABS FAIL SIGNAL (On/Off) ×Displays the reception status of the ABS malfunction sig-
nal received through CAN communication.
ABS ON (On/Off) ×Displays the reception status of the ABS operation signal
received through CAN communication.
RANGE ×Displays the gear position recognized by TCM.
M GEAR POS* ×Display the target gear of manual mode
G SEN SLOPE* (%) Displays the gradient angle calculated from the G sensor
signal voltage.
G SEN CALIBRATION* (YET/DONE) Displays the status of “G
SENSOR CALIBRATION” in
“Work Support”.
N IDLE STATUS* (On/Off) Displays idle neutral status.
ENGBRKLVL (On/Off) Displays the
setting of “ENGINE BRAKE ADJ” in “Work
Support”.
DRIVE MODE STATS* Displays the drive mode status recognized by TCM.
SNOW MODE* (On/Off) Displays whether it is the SNOW mode.
ECO MODE* (On/Off) Displays whether it is the ECO mode. Monitored item (Unit)
Monitor item selection
Remarks
ECU IN-
PUT SIG-
NALS MAIN SIG-
NALS
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

TM-48
< SYSTEM DESCRIPTION >[CVT: RE0F10D]
DIAGNOSIS SYSTEM (TCM)
*: Not applicable but displayed.
WORK SUPPORT
Engine brake adjustment
Check the degradation level of the CVT fluid.
ACTIVE TEST
NORMAL MODE* (On/Off) D
isplays whether it is the NORMAL mode.
SPORT MODE* (On/Off) Displays whether it is the SPORT mode.
AIR BLDING STATE* (INCOMP/
COMP) Displays the status of “E
LECTRIC O.P. AIR BLEEDING”
in “Work Support”.
ELECTRIC OP DUTY* (%) Displays the command signal value (duty) of the electric
oil pump transmitted from TCM.
E-OP DUTY MON* (%) Monitors the status signal value (duty) transmitted from
the electric oil pump and displays the monitored value.
ELECTRIC OP RELAY* (On/Off) Displays the command status from TCM to the electric oil
pump relay.
E-OP RELAY MON* (On/Off) Monitors the command status from TCM to the oil pump
relay and displays the monitored value.
Monitored item (Unit)
Monitor item selection
Remarks
ECU IN-
PUT SIG-
NALS MAIN SIG-
NALS
Item name Description
CONFORM CVTF DETERIORTN Checks the degradation level of the CVT fluid under severe conditions.
ERASE MEMORY DATA Performs “erasing of the calibration data” and “erasing of the learned value” at the
same time.
G SENSOR CALIBRATION Compensates the G sensor.
ERASE LEARNING VALUE Erases lear ning value memorized by TCM.
ENGINE BRAKE ADJ. Although there is no malfunction on the transaxle and the CVT system, if a cus-
tomer make a complaint like “I do not feel comfortable with automatic operation of
the engine brake on downhill”, the engine brake may be cancelled with “engine
brake adjustment”.
ERASE CALIBRATION DATA Erases cali bration data memorized by TCM.
WRITE IP CHARA - REPLACEMENT AT/CVT Writes IP characteristics when transaxle assembly is replaced.
READ IP CHARA - REPLACEMENT TCM Reads IP characteristics when TCM is replaced.
WRITE IP CHARA - REPLACEMENT TCM Writes IP characteristics when TCM is replaced.
ENGINE BRAKE LEVEL
ON : Turn ON the engine brake control.
OFF : Turn OFF the engine brake control.
CVTF degradation level data
210,000 or more : Replacement of the CVT fluid is required.
Less than 210,000 : Replacement of the CVT fluid is not required.
Item name Description
CVT OIL COOLER FAN CIRCUIT Checks the operation of CVT oil cooler fan relay.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

TCM
TM-51
< ECU DIAGNOSIS INFORMATION > [CVT: RE0F10D]
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PRI SOLENOID • After engine warm up
• Selector lever: “N” position
• At idle 0.800 – 0.850 A
SEC SOLENOID CURRENT • After engine warm up
• Selector lever: “N” position
• At idle 0.800 – 0.850 A
SELECT SOLENOID CURRENT • After engine warm up
• Selector lever: “N” position
• At idle 1.000 A
SOLMON1 • Engine started
• Vehicle is stopped. 0.000 A
• Selector lever: “D” position
• Accelerator pedal position: 1/8 or less
• Vehicle speed: 20 km/h (12 MPH) or more 0.500 A
SOLMON2 • After engine warm up
• Selector lever: “N” position
• At idle 0.800 – 0.850 A
PRI SOL MON • After engine warm up
• Selector lever: “N” position
• At idle 0.800 – 0.850 A
SEC SOL MON CURRENT • After engine warm up
• Selector lever: “N” position
• At idle 0.800 – 0.850 A
SELECT SOL MON CURRENT • After engine warm up
• Selector lever: “N” position
• At idle 1.000 A
D POSITION SW Selector lever: “D” position On
Other than the above Off
N POSITION SW Selector lever: “N” position On
Other than the above Off
R POSITION SW Selector lever: “R” position On
Other than the above Off
P POSITION SW Selector lever: “P” position On
Other than the above Off
L POSITION SW Always Off
DS RANGE SW Selector lever: “DS” position On
Other than the above Off
BRAKESW Brake pedal is depressed On
Brake pedal is released Off
IDLE SW Accelerator pedal is fully depressed On
Accelerator pedal is released Off
SPORT MODE SW Press the overdrive control switch On
Release the overdrive control switch Off
ECO MODE SW Always Off
STRDWNSW Always Off
STRUPSW Always Off
DOWNLVR Always Off
UPLVR Always Off
NONMMODE Always On Monitor item Condition Value/Status (Approx.)
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

TM-52
< ECU DIAGNOSIS INFORMATION >[CVT: RE0F10D]
TCM
MMODE Always Off
TOW MODE SW Always Off
SHIFT IND SIGNAL When the selector lever is positioned in be-
tween each position. OFF
Selector lever: P position P
Selector lever: R position R
Selector lever: N position N
Selector lever: D position D
CVT LAMP Approx. 2 seconds after ignition switch ON On
Other than the above Off
SPORT MODE IND In overdrive off On
Other than the above Off
MANU MODE SIGNAL Always Off
DS RANGE SIGNAL Selector lever in DS position On
Other than the above Off
ECO MODE SIGNAL Always Off
VDC ON Always Off
TCS ON Always Off
ABS FAIL SIGNAL When ABS malfunction signal is received On
Other than the above Off
ABS ON ABS is activated On
Other than the above Off
RANGE Selector lever: P and N positions N/P
Selector lever: R position R
Selector lever: D position D
Selector lever: DS position S
Selector lever: D position (in O/D OFF) S
M GEAR POS Always 1
G SEN SLOPE Flat road 0%
Uphill gradient The value changes to the positive side
along with uphill gradient. (Maximum
40.45%)
Downhill gradient The value changes to the negative side
along with downhill gradient. (Minimum
40.45%)
G SEN CALIBRATION When G sensor calibration is completed DONE
When G sensor calibration is not completed YET
N IDLE STATUS Always Off
ENGBRKLVL When the engine brake level of “ENGINE
BRAKE ADJ”. in “Work Support” is ON On
When the engine brake level of “ENGINE
BRAKE ADJ”. in “Work Support” is OFF Off
DRIVE MODE STATS While driving in D position AUTO
SNOW MODE Always Off
ECO MODE Always Off
NOTMAL MODE Always Off
SPORT MODE Always Off Monitor item Condition Value/Status (Approx.)
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

TM-168
< DTC/CIRCUIT DIAGNOSIS >[CVT: RE0F10D]
OD OFF INDICATOR LAMP
OD OFF INDICATOR LAMP
Component Function CheckINFOID:0000000009464109
1.CHECK O/D OFF INDICATOR LAMP FUNCTION
Check O/D OFF indicator lamp turns ON for approx. 2 seconds when ignition switch turns ON.
Is the inspection results normal?
YES >> INSPECTION END
NO >> Go to TM-168, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000009464110
1.CHECK DTC (TCM)
With CONSULT
1. Turn ignition switch ON.
2. Check “Self Diagnostic Results” in “TRANSMISSION”.
Is any DTC detected?
YES >> Check DTC detected item. Refer to TM-60, "DTC Index".
NO >> GO TO 2.
2.CHECK DTC (COMBINATION METER)
With CONSULT
Check “Self Diagnostic Results” in “METER/M&A”.
Is any DTC detected?
YES >> Check DTC detected item. Refer to MWI-27, "DTC Index".
NO >> GO TO 3.
3.CHECK COMBINATION METER INPUT SIGNAL
With CONSULT
1. Shift the selector lever to “D” position.
2. Select “Data Monito r” in “METER/M&A”.
3. Select “O/D OFF IND”.
4. Check that “O/D OFF IND” turns ON/OFF when ov erdrive control switch is operated. Refer to MWI-22,
"Reference Value".
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-82, "Removal and Installation".
NO >> GO TO 4.
4.CHECK TCM INPUT/OUTPUT SIGNAL
With CONSULT
1. Select “Data Monitor” in “TRANSMISSION”.
2. Select “SPORT MODE SW”.
3. Check that “SPORT MODE SW” turns ON/OFF when overdrive control switch is operated. Refer to TM-
49, "Reference Value".
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-82, "Removal and Installation".
NO >> Check overdrive control switch. Refer to TM-166, "Diagnosis Procedure"
.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

TM-248
< SYSTEM DESCRIPTION >[CVT: RE0F10E]
DIAGNOSIS SYSTEM (TCM)
TRGT PRI PRESSURE (MPa)Displays the target oil pressure of the primary pressure
solenoid valve calculated from oil pressure processing of
gear shift control.
TRGT SELECT PRESSURE (MPa) Displays the target oil pressure of the select solenoid
valve calculated from oil pressure processing of gear
shift control.
TRGT SEC PRESSURE (MPa) Displays the target oil pressure of the secondary pres-
sure solenoid valve calculated from oil pressure process-
ing of gear shift control.
ISOLT1 (A) ×Displays the command current from TCM to the torque
converter clutch solenoid valve.
ISOLT2 (A) ×Displays the command current from TCM to the line
pressure solenoid valve.
PRI SOLENOID (A) ×Displays the command current from TCM to the primary
pressure solenoid valve.
SEC SOLENOID CURRENT (A) ×Displays the command current from TCM to the second-
ary pressure solenoid valve.
SELECT SOLENOID CUR-
RENT (A)
×Displays the command current from TCM to the select
solenoid valve.
SOLMON1 (A) ××Monitors the command current from TCM to the torque
converter clutch solenoid valve and displays the moni-
tored value.
SOLMON2 (A) ××Monitors the command current from TCM to the line
pressure solenoid valve and displays the monitored val-
ue.
PRI SOL MON (A) ××Monitors the command current from TCM to the primary
pressure solenoid valve and displays the monitored val-
ue.
SEC SOL MON CURRENT (A) ××Monitors the command current from TCM to the second-
ary pressure solenoid valve and displays the monitored
value.
SELECT SOL MON CURRENT (A) ××Monitors the command current from TCM to the select
solenoid valve and displays the monitored value.
D POSITION SW (On/Off) ×Displays the operation status of the transmission range
switch (D position).
N POSITION SW (On/Off) ×Displays the operation status of the transmission range
switch (N position).
R POSITION SW (On/Off) ×Displays the operation status of the transmission range
switch (R position).
P POSITION SW (On/Off) ×Displays the operation status of the transmission range
switch (P position).
L POSITION SW* (On/Off) ×Displays the operation status of the transmission range
switch (L position).
DS RANGE SW (On/Off) ×Displays the operation status of the transmission range
switch (Ds position).
BRAKESW (On/Off) ××Displays the reception status of the stop lamp switch sig-
nal received through CAN communication.
IDLE SW (On/Off) ××Displays the reception status of the closed throttle posi-
tion signal received through CAN communication.
SPORT MODE SW* (On/Off) ××Displays the reception status of the overdrive control
switch signal received through CAN communication.
Monitored item (Unit)
Monitor item selection
Remarks
ECU IN-
PUT SIG-
NALS MAIN SIG-
NALS
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

DIAGNOSIS SYSTEM (TCM)TM-249
< SYSTEM DESCRIPTION > [CVT: RE0F10E]
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ECO MODE SW* (On/Off) ××Displays the reception status of the ECO mode switch
signal received through CAN communication.
STRDWNSW (On/Off) ×Displays the operation status of the paddle shifter (down
switch).
STRUPSW (On/Off) ×Displays the operation status of the paddle shifter (up
switch).
DOWNLVR* (On/Off) ×Displays the operation status of the selector lever (down
switch).
UPLVR* (On/Off) ×Displays the operation status of the selector lever (up
switch).
NONMMODE (On/Off) ×Displays if the selector lever position is not at the manual
shift gate.
MMODE (On/Off) ×Displays if the selector lever position is at the manual
shift gate.
TOW MODE SW* (On/Off) ×Displays the reception status of the TOW mode switch
signal received through CAN communication.
SHIFT IND SIGNAL Displays the transaxle value of shift position signal trans-
mitted via CAN communication.
CVT LAMP* (On/Off) Displays the transaxle status of the CVT warning lamp
signal transmitted through CAN communication.
SPORT MODE IND* (On/Off) Displays the transaxle status of the O/D OFF indicator
lamp signal transmitted through CAN communication.
MANU MODE SIGNAL (On/Off) Displays the transaxle status of the manual mode signal
transmitted through CAN communication.
DS RANGE SIGNAL (On/Off) Displays the shift position signal status from transmis-
sion range switch (Ds position).
ECO MODE SIGNAL* (On/Off) Displays the transaxle status of the ECO mode signal
transmitted through CAN communication.
VDC ON (On/Off) ×Displays the reception status of the VDC operation signal
received through CAN communication.
TCS ON (On/Off) ×Displays the reception status of the TCS operation signal
received through CAN communication.
ABS FAIL SIGNAL (On/Off) ×Displays the reception status of the ABS malfunction sig-
nal received through CAN communication.
ABS ON (On/Off) ×Displays the reception status of the ABS operation signal
received through CAN communication.
RANGE ×Displays the gear position recognized by TCM.
M GEAR POS ×Display the target gear of manual mode
G SEN SLOPE* (%) Displays the gradient angle calculated from the G sensor
signal voltage.
G SEN CALIBRATION* (YET/DONE) Displays the status of “G
SENSOR CALIBRATION” in
“Work Support”.
N IDLE STATUS* (On/Off) Displays idle neutral status.
ENGBRKLVL (On/Off) Displays the
setting of “ENGINE BRAKE ADJ” in “Work
Support”.
DRIVE MODE STATS* Displays the drive mode status recognized by TCM.
SNOW MODE* (On/Off) Displays whether it is the SNOW mode.
ECO MODE* (On/Off) Displays whether it is the ECO mode. Monitored item (Unit)
Monitor item selection
Remarks
ECU IN-
PUT SIG-
NALS MAIN SIG-
NALS
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

TM-250
< SYSTEM DESCRIPTION >[CVT: RE0F10E]
DIAGNOSIS SYSTEM (TCM)
*: Not applicable but displayed.
WORK SUPPORT
Engine brake adjustment
Check the degradation level of the CVT fluid.
ACTIVE TEST
NORMAL MODE* (On/Off) D
isplays whether it is the NORMAL mode.
SPORT MODE* (On/Off) Displays whether it is the SPORT mode.
AIR BLDING STATE* (INCOMP/
COMP) Displays the status of “E
LECTRIC O.P. AIR BLEEDING”
in “Work Support”.
ELECTRIC OP DUTY* (%) Displays the command signal value (duty) of the electric
oil pump transmitted from TCM.
E-OP DUTY MON* (%) Monitors the status signal value (duty) transmitted from
the electric oil pump and displays the monitored value.
ELECTRIC OP RELAY* (On/Off) Displays the command status from TCM to the electric oil
pump relay.
E-OP RELAY MON* (On/Off) Monitors the command status from TCM to the oil pump
relay and displays the monitored value.
Monitored item (Unit)
Monitor item selection
Remarks
ECU IN-
PUT SIG-
NALS MAIN SIG-
NALS
Item name Description
CONFORM CVTF DETERIORTN Checks the degradation level of the CVT fluid under severe conditions.
ERASE MEMORY DATA Performs “erasing of the calibration data” and “erasing of the learned value” at the
same time.
G SENSOR CALIBRATION Compensates the G sensor.
ERASE LEARNING VALUE Erases lear ning value memorized by TCM.
ENGINE BRAKE ADJ. Although there is no malfunction on the transaxle and the CVT system, if a cus-
tomer make a complaint like “I do not feel comfortable with automatic operation of
the engine brake on downhill”, the engine brake may be cancelled with “engine
brake adjustment”.
ERASE CALIBRATION DATA Erases cali bration data memorized by TCM.
WRITE IP CHARA - REPLACEMENT AT/CVT Writes IP characteristics when transaxle assembly is replaced.
READ IP CHARA - REPLACEMENT TCM Reads IP characteristics when TCM is replaced.
WRITE IP CHARA - REPLACEMENT TCM Writes IP characteristics when TCM is replaced.
ENGINE BRAKE LEVEL
ON : Turn ON the engine brake control.
OFF : Turn OFF the engine brake control.
CVTF degradation level data
210,000 or more : Replacement of the CVT fluid is required.
Less than 210,000 : Replacement of the CVT fluid is not required.
Item name Description
CVT OIL COOLER FAN CIRCUIT Checks the operation of CVT oil cooler fan relay.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM