2001 NISSAN ALMERA ECU

Supplemental Restraint System (SRS) ªAIR
BAGº and ªSEAT BELT PRE-TENSIONERº
NJAT0249The Supplemental Restraint System such as ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of
collision. The SRS system composition which is available to NISSAN MODEL N16 is as follows (The compo-
sition varies according to the destination and optional equipment.):
+For a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing wheel), front passenger air bag module (located on the instrument panel on passenger side), front seat
belt pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.
+For a side collision
The Supplemental Restraint System consists of front side air bag module (located in the outer side of front
seat), side air bag (satellite) sensor, diagnosis sensor unit (one of components of air bags for a frontal
collision), wiring harness, warning lamp (one of components of air bags for a frontal collision).
Information necessary to service the system safely is included in theRS sectionof this Service Manual.
WARNING:
+To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance should be per-
formed by an authorized NISSAN dealer.
+Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the RS section.
+Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and wiring harnesses covered with yellow insulation tape either just
before the harness connectors or for the complete harness are related to the SRS.
Precautions for On Board Diagnostic (EURO-
OBD) System of A/T and Engine Ð Euro-OBD
Ð
NJAT0245The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:
+Be sure to turn the ignition switch ªOFFº and disconnect the negative battery terminal before any
repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc.
will cause the MIL to light up.
+Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MIL to light up due to an open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
+Be sure to route and secure the harnesses properly after work. Interference of the harness with a
bracket, etc. may cause the MIL to light up due to a short circuit.
+Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MIL to light up due to a malfunction of the EGR system or fuel injection system,
etc.
+Be sure to erase the unnecessary malfunction information (repairs completed) from the TCM and
ECM before returning the vehicle to the customer.
SEF289H
PrecautionsNJAT0246+Before connecting or disconnecting the TCM harness
connector, turn ignition switch OFF and disconnect nega-
tive battery terminal. Failure to do so may damage the
TCM. Because battery voltage is applied to TCM even if
ignition switch is turned off.
PRECAUTIONS
Supplemental Restraint System (SRS) ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº
AT-7

SELF-DIAGNOSTIC RESULT TEST MODENJAT0022S03
Detected items
(Screen terms for CONSULT-II, ªSELF-DIAG
RESULTSº test mode)Malfunction is detected when ... Remarks
Item Display
No failure
(NO SELF DIAGNOSTIC FAILURE INDICATED
FURTHER TESTING MAY BE REQUIRED**)+No failure has been detected.
Initial start+This is not a malfunction message (Whenever shut-
ting off a power supply to the TCM, this message
appears on the screen.) INITIAL START
Ð
Revolution sensor VHCL SPEED
SEN´A/T+TCM does not receive the proper voltage signal from
the sensor.
Vehicle speed sensor
(Meter)VHCL SPEED
SEN´MTR+TCM does not receive the proper voltage signal from
the sensor.
Throttle position sen-
sor
Throttle position switchTHROTTLE POSI
SEN+TCM receives an excessively low or high voltage
from the sensor.
Shift solenoid valve A SHIFT SOLENOID/V A+TCM detects an improper voltage drop when it tries
to operate the solenoid valve.
Shift solenoid valve B SHIFT SOLENOID/V B+TCM detects an improper voltage drop when it tries
to operate the solenoid valve.
Overrun clutch sole-
noid valveOVERRUN CLUTCH
S/V+TCM detects an improper voltage drop when it tries
to operate the solenoid valve.
T/C clutch solenoid
valveT/C CLUTCH SOL/V+TCM detects an improper voltage drop when it tries
to operate the solenoid valve.
A/T fluid temperature
sensorBATT/FLUID TEMP
SEN+TCM receives an excessively low or high voltage
from the sensor.To be displayed in
case of abnormality
and when no recording
is made.
Engine speed signal ENGINE SPEED SIG+TCM does not receive the proper voltage signal from
the ECM.
Line pressure solenoid
valveLINE PRESSURE S/V+TCM detects an improper voltage drop when it tries
to operate the solenoid valve.
TCM (RAM) CONTROL UNIT
(RAM)+TCM memory (RAM) is malfunctioning.
TCM (ROM) CONTROL UNIT
(ROM)+TCM memory (ROM) is malfunctioning.
TCM (EEP ROM) CONT UNIT (EEP
ROM)+TCM memory (EEP ROM) is malfunctioning.
DATA MONITOR MODE (A/T)NJAT0022S04
Item DisplayMonitor item
Description Remarks
ECU input
signalsMain sig-
nals
Vehicle speed sensor 1
(A/T)
(Revolution sensor)VHCL/S SE´A/T
[km/h] or [mph]
XÐ+Vehicle speed com-
puted from signal of
revolution sensor is dis-
played.When racing engine in ªNº
or ªPº position with vehicle
stationary, CONSULT-II
data may not indicate 0
km/h (0 mph).
ON BOARD DIAGNOSTIC
SYSTEM DESCRIPTION
EXCEPT FOR EURO-OBD
CONSULT-II (Cont'd)
AT-40

Item DisplayMonitor item
Description Remarks
ECU input
signalsMain sig-
nals
Vehicle speed sensor 2
(Meter)VHCL/S SE´MTR
[km/h] or [mph]
XÐ+Vehicle speed com-
puted from signal of
vehicle speed sensor is
displayed.Vehicle speed display may
not be accurate under
approx. 10 km/h (6 mph).
It may not indicate 0 km/h
(0 mph) when vehicle is
stationary.
Throttle position sensor THRTL POS SEN
[V] X Ð+Throttle position sensor
signal voltage is dis-
played.
A/T fluid temperature sen-
sorFLUID TEMP SE
[V]
XÐ+A/T fluid temperature
sensor signal voltage is
displayed.
+Signal voltage lowers as
fluid temperature rises.
Battery voltage BATTERY VOLT
[V]XÐ+Source voltage of TCM
is displayed.
Engine speed ENGINE SPEED
[rpm]
XX+Engine speed, com-
puted from engine
speed signal, is dis-
played.Engine speed display may
not be accurate under
approx. 800 rpm. It may
not indicate 0 rpm even
when engine is not run-
ning.
Overdrive control switch OVERDRIVE SW
[ON/OFF]
XÐ+ON/OFF state com-
puted from signal of
overdrive control SW is
displayed.
P/N position switch PN POSI SW
[ON/OFF]
XÐ+ON/OFF state com-
puted from signal of P/N
position SW is dis-
played.
R position switch R POSITION SW
[ON/OFF]
XÐ+ON/OFF state com-
puted from signal of R
position SW is dis-
played.
D position switch D POSITION SW
[ON/OFF]
XÐ+ON/OFF state com-
puted from signal of D
position SW is dis-
played.
2 position switch 2 POSITION SW
[ON/OFF]
XÐ+ON/OFF status, com-
puted from signal of 2
position SW, is dis-
played.
1 position switch 1 POSITION SW
[ON/OFF]
XÐ+ON/OFF status, com-
puted from signal of 1
position SW, is dis-
played.
ASCD cruise signal ASCD-CRUISE
[ON/OFF]
XÐ+Status of ASCD cruise
signal is displayed.
ON ... Cruising state
OFF ... Normal running
state+This is displayed even
when no ASCD is
mounted.
ON BOARD DIAGNOSTIC
SYSTEM DESCRIPTION
EXCEPT FOR EURO-OBD
CONSULT-II (Cont'd)
AT-41

Item DisplayMonitor item
Description Remarks
ECU input
signalsMain sig-
nals
ASCD OD cut signal ASCD-OD CUT
[ON/OFF]
XÐ+Status of ASCD OD
release signal is dis-
played.
ON ... OD released
OFF ... OD not released+This is displayed even
when no ASCD is
mounted.
Kickdown switch KICKDOWN SW
[ON/OFF]
XÐ+ON/OFF status, com-
puted from signal of
kickdown SW, is dis-
played.+This is displayed even
when no kickdown
switch is equipped.
Closed throttle position
switchCLOSED
THL/SW
[ON/OFF]XÐ+ON/OFF status, com-
puted from signal of
closed throttle position
SW, is displayed.
Wide open throttle position
switchW/O THRL/P-SW
[ON/OFF]
XÐ+ON/OFF status, com-
puted from signal of
wide open throttle posi-
tion SW, is displayed.
Gear position GEAR
ÐX+Gear position data used
for computation by
TCM, is displayed.
Selector lever position SLCT LVR POSI
ÐX+Selector lever position
data, used for computa-
tion by TCM, is dis-
played.+A specific value used
for control is displayed if
fail-safe is activated due
to error.
Vehicle speed VEHICLE SPEED
[km/h] or [mph] Ð X+Vehicle speed data,
used for computation by
TCM, is displayed.
Stop lamp switch BRAKE SW
[ON/OFF]
XÐ+ON/OFF status are dis-
played.
ON: Brake pedal is
depressed.
OFF: Brake pedal is
released.
Throttle position THROTTLE POSI
[/8]
ÐX+Throttle position data,
used for computation by
TCM, is displayed.+A specific value used
for control is displayed if
fail-safe is activated due
to error.
Line pressure duty LINE PRES DTY
[%]
ÐX+Control value of line
pressure solenoid valve,
computed by TCM from
each input signal, is dis-
played.
Torque converter clutch
solenoid valve dutyTCC S/V DUTY
[%]
ÐX+Control value of torque
converter clutch sole-
noid valve, computed by
TCM from each input
signal, is displayed.
ON BOARD DIAGNOSTIC
SYSTEM DESCRIPTION
EXCEPT FOR EURO-OBD
CONSULT-II (Cont'd)
AT-42

Item DisplayMonitor item
Description Remarks
ECU input
signalsMain sig-
nals
Shift solenoid valve A SHIFT S/V A
[ON/OFF]
ÐX+Control value of shift
solenoid valve A, com-
puted by TCM from
each input signal, is dis-
played.Control value of solenoid
is displayed even if sole-
noid circuit is discon-
nected.
The ªOFFº signal is dis-
played if solenoid circuit is
shorted. Shift solenoid valve B SHIFT S/V B
[ON/OFF]
ÐX+Control value of shift
solenoid valve B, com-
puted by TCM from
each input signal, is dis-
played.
Overrun clutch solenoid
valveOVERRUN/C S/V
[ON/OFF]
ÐX+Control value of overrun
clutch solenoid valve
computed by TCM from
each input signal is dis-
played.
Self-diagnosis display
lamp
(O/D OFF indicator lamp)SELF-D DP LMP
[ON/OFF] Ð X+Control status of O/D
OFF indicator lamp is
displayed.
X: Applicable
Ð: Not applicable
SAT580J
HOW TO ERASE SELF-DIAGNOSTIC RESULTS
(
WITH CONSULT-II)NJAT0022S081. If the ignition switch stays ªONº after repair work, be sure to
turn ignition switch ªOFFº once. Wait for at least 3 seconds and
then turn it ªONº again.
2. Turn CONSULT-II ªONº, and touch ªA/Tº.
SAT971J
3. Touch ªSELF-DIAG RESULTSº.
ON BOARD DIAGNOSTIC
SYSTEM DESCRIPTION
EXCEPT FOR EURO-OBD
CONSULT-II (Cont'd)
AT-43

Detected items
(Screen terms for CONSULT-II, ªSELF
DIAGNOSISº test mode)
Malfunction is detected when ...TCM self-diagnosis EURO-OBD (DTC)
Available by
O/D OFF
indicator lamp or
ªA/Tº on CONSULT-IIAvailable by
malfunction
indicator*2,
ªENGINEº on CON-
SULT-II or GST ªA/Tº ªENGINEº
No failure
(NO SELF DIAGNOSTIC FAILURE INDI-
CATED FURTHER TESTING MAY BE
REQUIRED**)+No failure has been detected.
XX
X: Applicable
Ð: Not applicable
*1: These malfunctions cannot be displayed by MI
if another malfunction is assigned to MI.
*2: Refer to EC-74, ªMalfunction Indicator (MI)º.
DATA MONITOR MODE (A/T)NJAT0256S03
Item DisplayMonitor item
Description Remarks
ECU input
signalsMain sig-
nals
Vehicle speed sensor 1
(A/T)
(Revolution sensor)VHCL/S SE´A/T
[km/h] or [mph]
XÐ+Vehicle speed computed
from signal of revolution
sensor is displayed.When racing engine in ªNº
or ªPº position with vehicle
stationary, CONSULT-II
data may not indicate 0
km/h (0 mph).
Vehicle speed sensor 2
(Meter)VHCL/S SE´MTR
[km/h] or [mph]
XÐ+Vehicle speed computed
from signal of vehicle
speed sensor is dis-
played.Vehicle speed display may
not be accurate under
approx. 10 km/h (6 mph). It
may not indicate 0 km/h (0
mph) when vehicle is sta-
tionary.
Throttle position sensor THRTL POS
SEN
[V]XÐ+Throttle position sensor
signal voltage is dis-
played.
A/T fluid temperature sen-
sorFLUID TEMP SE
[V]
XÐ+A/T fluid temperature
sensor signal voltage is
displayed.
+Signal voltage lowers as
fluid temperature rises.
Battery voltage BATTERY VOLT
[V]XÐ+Source voltage of TCM
is displayed.
Engine speed ENGINE SPEED
[rpm]
XX+Engine speed, com-
puted from engine
speed signal, is dis-
played.Engine speed display may
not be accurate under
approx. 800 rpm. It may
not indicate 0 rpm even
when engine is not run-
ning.
Overdrive control switch OVERDRIVE SW
[ON/OFF] X Ð+ON/OFF state computed
from signal of overdrive
control SW is displayed.
P/N position switch PN POSI SW
[ON/OFF] X Ð+ON/OFF state computed
from signal of P/N posi-
tion SW is displayed.
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
EURO-OBD
CONSULT-II (Cont'd)
AT-57

Item DisplayMonitor item
Description Remarks
ECU input
signalsMain sig-
nals
R position switch R POSITION SW
[ON/OFF] X Ð+ON/OFF state computed
from signal of R position
SW is displayed.
D position switch D POSITION SW
[ON/OFF] X Ð+ON/OFF state computed
from signal of D position
SW is displayed.
2 position switch 2 POSITION SW
[ON/OFF]
XÐ+ON/OFF status, com-
puted from signal of 2
position SW, is dis-
played.
1 position switch 1 POSITION SW
[ON/OFF]
XÐ+ON/OFF status, com-
puted from signal of 1
position SW, is dis-
played.
ASCD cruise signal ASCD-CRUISE
[ON/OFF]
XÐ+Status of ASCD cruise
signal is displayed.
ON ... Cruising state
OFF ... Normal running
state+This is displayed even
when no ASCD is
mounted.
ASCD OD cut signal ASCD-OD CUT
[ON/OFF]
XÐ+Status of ASCD OD
release signal is dis-
played.
ON ... OD released
OFF ... OD not released+This is displayed even
when no ASCD is
mounted.
Kickdown switch KICKDOWN SW
[ON/OFF]
XÐ+ON/OFF status, com-
puted from signal of
kickdown SW, is dis-
played.+This is displayed even
when no kickdown
switch is equipped.
Closed throttle position
switchCLOSED
THL/SW
[ON/OFF]XÐ+ON/OFF status, com-
puted from signal of
closed throttle position
SW, is displayed.
Wide open throttle position
switchW/O THRL/P-SW
[ON/OFF]
XÐ+ON/OFF status, com-
puted from signal of
wide open throttle posi-
tion SW, is displayed.
Gear position GEAR
ÐX+Gear position data used
for computation by
TCM, is displayed.
Selector lever position SLCT LVR POSI
ÐX+Selector lever position
data, used for computa-
tion by TCM, is dis-
played.+A specific value used for
control is displayed if
fail-safe is activated due
to error.
Vehicle speed VEHICLE
SPEED
[km/h] or [mph]ÐX+Vehicle speed data,
used for computation by
TCM, is displayed.
Stop lamp switch BRAKE SW
[ON/OFF]
XÐ+ON/OFF status are dis-
played.
ON: Brake pedal is
depressed.
OFF: Brake pedal is
released.
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
EURO-OBD
CONSULT-II (Cont'd)
AT-58

Item DisplayMonitor item
Description Remarks
ECU input
signalsMain sig-
nals
Throttle position THROTTLE
POSI
[/8]ÐX+Throttle position data,
used for computation by
TCM, is displayed.+A specific value used for
control is displayed if
fail-safe is activated due
to error.
Line pressure duty LINE PRES DTY
[%]
ÐX+Control value of line
pressure solenoid valve,
computed by TCM from
each input signal, is dis-
played.
Torque converter clutch
solenoid valve dutyTCC S/V DUTY
[%]
ÐX+Control value of torque
converter clutch sole-
noid valve, computed by
TCM from each input
signal, is displayed.
Shift solenoid valve A SHIFT S/V A
[ON/OFF]
ÐX+Control value of shift
solenoid valve A, com-
puted by TCM from
each input signal, is dis-
played.Control value of solenoid is
displayed even if solenoid
circuit is disconnected.
The ªOFFº signal is dis-
played if solenoid circuit is
shorted.
Shift solenoid valve B SHIFT S/V B
[ON/OFF]
ÐX+Control value of shift
solenoid valve B, com-
puted by TCM from
each input signal, is dis-
played.
Overrun clutch solenoid
valveOVERRUN/C S/V
[ON/OFF]
ÐX+Control value of overrun
clutch solenoid valve
computed by TCM from
each input signal is dis-
played.
Self-diagnosis display lamp
(O/D OFF indicator lamp)SELF-D DP LMP
[ON/OFF] Ð X+Control status of O/D
OFF indicator lamp is
displayed.
X: Applicable
Ð: Not applicable
SAT998J
DTC WORK SUPPORT MODE WITH CONSULT-IINJAT0256S04CONSULT-II Setting ProcedureNJAT0256S04011. Turn ignition switch ªOFFº.
2. Connect CONSULT-II to data link connector which is located
in left side lower dash panel.
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
EURO-OBD
CONSULT-II (Cont'd)
AT-59