2003 NISSAN ALMERA N16 ecm

AT-8
PRECAUTIONS
●Internal failure of stator roller clutch.
●Heavy clutch debris due to overheating (blue converter).
●Steel particles or clutch lining material found in fluid filter or on magnet when no internal parts in unit are
worn or damaged — indicates that lining material came from converter.
The torque converter should not be replaced if:
●The fluid has an odor, is discolored, and there is no evidence of metal or clutch facing particles.
●The threads in one or more of the converter bolt holes are damaged.
●Transaxle failure did not display evidence of damaged or worn internal parts, steel particles or clutch plate
lining material in unit and inside the fluid filter.
●Vehicle has been exposed to high mileage (only). The exception may be where the torque converter
clutch dampener plate lining has seen excess wear by vehicles operated in heavy and/or constant traffic,
such as taxi, delivery or police use.
EURO-OBD SELF-DIAGNOSIS — EURO-OBD —
●A/T self-diagnosis is performed by the TCM in combination with the ECM. The results can be read through
the blinking pattern of the O/D OFF indicator lamp or the malfunction indicator (MI). Refer to the table on
AT- 4 2 , "
SELF-DIAGNOSTIC RESULT TEST MODE" for the indicator used to display each self-diagnostic
result.
●The self-diagnostic results indicated by the MI are automatically stored in both the ECM and TCM memo-
ries.
Always perform the procedure AT- 3 9 , "
HOW TO ERASE DTC" to complete the repair and avoid
unnecessary blinking of the MI.
●The following self-diagnostic items can be detected using ECM self-diagnostic results mode* only when
the O/D OFF indicator lamp does not indicate any malfunctions.
–PNP switch
–A/T 1st, 2nd, 3rd, or 4th gear function
*: For details of EURO-OBD, refer to AT-37, "
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION" .
●Certain systems and components, especially those related to EURO-OBD, may use a new style
slide-locking type harness connector.
For description and how to disconnect, refer to EL-7, "HARNESS CONNECTOR".
Wiring Diagrams and Trouble DiagnosisECS007N9
When you read wiring diagrams, refer to the following:
●GI-12, "How to Read Wiring Diagrams".
●EL-11, "POWER SUPPLY ROUTING".
When you perform trouble diagnosis, refer to the following:
●GI-22, "How to Perform Efficient Diagnosis for an Electrical Incident".
●GI-32, "How to Follow Trouble Diagnosis".

AT-28
OVERALL SYSTEM
TCM FUNCTION
The function of the TCM is to:
●Receive input signals sent from various switches and sensors.
●Determine required line pressure, shifting point, lock-up operation, and engine brake operation.
●Send required output signals to the respective solenoid valves.
INPUT/OUTPUT SIGNAL OF TCM
Control MechanismECS007NK
LINE PRESSURE CONTROL
TCM has various line pressure control characteristics to match the driving conditions.
An ON-OFF duty signal is sent to the line pressure solenoid valve based on TCM characteristics.
Hydraulic pressure on the clutch and brake is electronically controlled through the line pressure solenoid valve
to accommodate engine torque. This results in smooth shift operation.
Normal Control
The line pressure to throttle opening characteristics is set for suitable
clutch operation.
Sensors, switches and solenoid
valvesFunction
InputPNP switch Detects select lever position and sends a signal to TCM.
Throttle position sensor (accelerator
pedal position (APP) sensor)Detects throttle valve position and sends a signal to TCM.
Engine speed signal From ECM.
A/T fluid temperature sensor Detects transmission fluid temperature and sends a signal to TCM.
Revolution sensor Detects output shaft rpm and sends a signal to TCM.
Vehicle speed sensorUsed as an auxiliary vehicle speed sensor. Sends a signal when revolution
sensor (installed on transmission) malfunctions.
Overdrive control switchSends a signal, which prohibits a shift to “D
4 ” (overdrive) position, to the
TCM.
Stop lamp switch Releases lock-up system when depressing pedal in lock-up condition.
OutputShift solenoid valve A/BSelects shifting point suited to driving conditions in relation to a signal sent
from TCM.
Line pressure solenoid valveRegulates (or decreases) line pressure suited to driving conditions in relation
to a signal sent from TCM.
Torque converter clutch solenoid
valveRegulates (or decreases) lock-up pressure suited to driving conditions in rela-
tion to a signal sent from TCM.
Overrun clutch solenoid valveControls an “engine brake” effect suited to driving conditions in relation to a
signal sent from TCM.
O/D OFF indicator lamp Shows TCM faults when A/T control components malfunction.
SAT003J

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
AT-37
[EURO-OBD]
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONPFP:00000
IntroductionECS007NN
The A/T system has two self-diagnostic systems.
The first is the emission-related on board diagnostic system (EURO-OBD) performed by the TCM in combina-
tion with the ECM. The malfunction is indicated by the MI (malfunction indicator) and is stored as a DTC in the
ECM memory but not the TCM memory.
The second is the TCM original self-diagnosis indicated by the O/D OFF indicator lamp. The malfunction is
stored in the TCM memory. The detected items are overlapped with EURO-OBD self-diagnostic items. For
detail, refer to AT-37, "
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION" .
EURO-OBD Function for A/T SystemECS007NO
The ECM provides emission-related on board diagnostic (EURO-OBD) functions for the A/T system. One
function is to receive a signal from the TCM used with EURO-OBD-related parts of the A/T system. The signal
is sent to the ECM when a malfunction occurs in the corresponding EURO-OBD-related part. The other func-
tion is to indicate a diagnostic result by means of the MI (malfunction indicator) on the instrument panel. Sen-
sors, switches and solenoid valves are used as sensing elements.
The MI automatically illuminates in One or Two Trip Detection Logic when a malfunction is sensed in relation
to A/T system parts.
One or Two Trip Detection Logic of EURO-OBDECS007NP
ONE TRIP DETECTION LOGIC
If a malfunction is sensed during the first test drive, the MI will illuminate and the malfunction will be stored in
the ECM memory as a DTC. The TCM is not provided with such a memory function.
TWO TRIP DETECTION LOGIC
When a malfunction is sensed during the first test drive, it is stored in the ECM memory as a 1st trip DTC
(diagnostic trouble code) or 1st trip freeze frame data. At this point, the MI will not illuminate. — First Trip
If the same malfunction as that experienced during the first test drive is sensed during the second test drive,
the MI will illuminate. — Second Trip
A/T-related parts for which the MI illuminates during the first or second test drive are listed below.
The “trip” in the “One or Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation.
EURO-OBD Diagnostic Trouble Code (DTC)ECS007NQ
HOW TO READ DTC AND 1ST TRIP DTC
DTC and 1st trip DTC can be read by the following methods.
( With CONSULT-II or GST)
CONSULT-II or GST (Generic Scan Tool) Examples: P0705, P0710, P0720, P0725, etc.
These DTCs are prescribed by ISO 15031-5.
(CONSULT-II also displays the malfunctioning component or system.)
●1st trip DTC No. is the same as DTC No.
●Output of the diagnostic trouble code indicates that the indicated circuit has a malfunction. How-
ever, in case of the Mode II and GST they do not indicate whether the malfunction is still occurring
or occurred in the past and returned to normal.
CONSULT-II can identify them as shown below. Therefore, using CONSULT-II (if available) is rec-
ommended.
ItemsMI
One trip detection Two trip detection
Shift solenoid valve A — DTC: P0750 X
Shift solenoid valve B — DTC: P0755 X
Throttle position sensor — DTC: P1705 X
Except aboveX

AT-38
[EURO-OBD]
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
A sample of CONSULT-II display for DTC is shown in the following
page. DTC or 1st trip DTC of a malfunction is displayed in SELF
DIAGNOSIS mode for “ENGINE” with CONSULT-II. Time data indi-
cates how many times the vehicle was driven after the last detection
of a DTC.
If the DTC is being detected currently, the time data will be “0”.
If a 1st trip DTC is stored in the ECM, the time data will be “1t”.
Freeze Frame Data and 1st Trip Freeze Frame Data
The ECM has a memory function, which stores the driving condition such as fuel system status, calculated
load value, engine coolant temperature, short term fuel trim, long term fuel trim, engine speed and vehicle
speed at the moment the ECM detects a malfunction.
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data,
and the data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-II
or GST. The 1st trip freeze frame data can only be displayed on the CONSULT-II screen, not on the GST. For
detail, refer to EC-87, "
CONSULT-II Function" (QG).
Only one set of freeze frame data (either 1st trip freeze frame data of freeze frame data) can be stored in the
ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority
for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once
freeze frame data (2nd trip detection/MI on) is stored in the ECM memory, 1st trip freeze frame data is no
longer stored. Remember, only one set of freeze frame data can be stored in the ECM.
The ECM has the following priorities to update the data.
Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM mem-
ory is erased.
SAT014K
SAT015K
SAT016K
Priority Items
1 Freeze frame data Misfire — DTC: P0300 - P0306
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175
2 Except the above items (Includes A/T related items)
3 1st trip freeze frame data

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
AT-39
[EURO-OBD]
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HOW TO ERASE DTC
The diagnostic trouble code can be erased by CONSULT-II, GST or ECM DIAGNOSTIC TEST MODE as
described following.
●If the battery terminal is disconnected, the diagnostic trouble code will be lost within 24 hours.
●When you erase the DTC, using CONSULT-II or GST is easier and quicker than switching the mode
selector on the ECM.
The following emission-related diagnostic information is cleared from the ECM memory when erasing DTC
related to EURO-OBD. For details, refer to EC-48, "
HOW TO ERASE EMISSION-RELATED DIAGNOSTIC
INFORMATION" .
●Diagnostic trouble codes (DTC)
●1st trip diagnostic trouble codes (1st trip DTC)
●Freeze frame data
●1st trip freeze frame data
●System readiness test (SRT) codes
●Test values
HOW TO ERASE DTC (WITH CONSULT-II)
●If a DTC is displayed for both ECM and TCM, it needs to be erased for both ECM and TCM.
1. If the ignition switch stays “ON” after repair work, be sure to turn ignition switch “OFF” once. Wait at least
5 seconds and then turn it “ON” (engine stopped) again.
2. Turn CONSULT-II “ON” and touch “A/T”.
3. Touch “SELF DIAGNOSIS”.
4. Touch “ERASE”. (The DTC in the TCM will be erased.) Then touch “BACK” twice.
5. Touch “ENGINE”.
6. Touch “SELF DIAGNOSIS”.

AT-40
[EURO-OBD]
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
7. Touch “ERASE”. (The DTC in the ECM will be erased.)
HOW TO ERASE DTC (WITH GST)
1. If the ignition switch stays “ON” after repair work, be sure to turn ignition switch “OFF” once. Wait at least
5 seconds and then turn it “ON” (engine stopped) again.
2. Perform “EURO-OBD SELF-DIAGNOSTIC PROCEDURE (No Tools)”. Refer to AT- 5 0
. (The engine
warm-up step can be skipped when performing the diagnosis only to erase the DTC.)
3. Select Mode 4 with Generic Scan Tool (GST). For details, refer to EC-97, "
Generic Scan Tool (GST) Func-
tion" .
HOW TO ERASE DTC (NO TOOLS)
1. If the ignition switch stays “ON” after repair work, be sure to turn ignition switch “OFF” once. Wait at least
5 seconds and then turn it “ON” (engine stopped) again.
2. Perform “TCM SELF-DIAGNOSTIC PROCEDURE (No Tools)”. Refer to AT- 5 1
. (The engine warm-up
step can be skipped when performing the diagnosis only to erase the DTC.)
SAT017K

AT-42
[EURO-OBD]
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
SELF-DIAGNOSTIC RESULT TEST MODE
Detected items
(Screen terms for CONSULT-II, “SELF
DIAGNOSIS” test mode)
Malfunction is detected when...TCM self-diagnosis EURO-OBD (DTC)
Available by O/D OFF
indicator lamp or “A/T”
on CONSULT-IIAvailable by malfunc-
tion indicator*
2 ,
“ENGINE” on CON-
SULT-II or GST “A/T” “ENGINE”
Park/neutral position (PNP) switch circuit
●TCM does not receive the correct
voltage signal (based on the gear
position) from the switch.— P0705
—PNP SW/CIRC
Revolution sensor
●TCM does not receive the proper
voltage signal from the sensor.
X P0720
VHCL SPEED
SEN·A/TVEH SPD SEN/CIR
AT
Vehicle speed sensor (Meter)
●TCM does not receive the proper
voltage signal from the sensor.
X—
VHCL SPEED
SEN·MTR—
A/T 1st gear function
●A/T cannot be shifted to the 1st
gear position even if electrical cir-
cuit is good.—
P0731*1
—A/T 1ST GR FNCTN
A/T 2nd gear function
●A/T cannot be shifted to the 2nd
gear position even if electrical cir-
cuit is good.—
P0732*1—A/T 2ND GR FNCTN
A/T 3rd gear function
●A/T cannot be shifted to the 3rd
gear position even if electrical cir-
cuit is good.—
P0733*1—A/T 3RD GR FNCTN
A/T 4th gear function
●A/T cannot be shifted to the 4th
gear position even if electrical cir-
cuit is good.—
P0734*1
—A/T 4TH GR FNCTN
Shift solenoid valve A
●TCM detects an improper voltage
drop when it tries to operate the
solenoid valve.XP0750
SHIFT SOLENOID/V
ASFT SOL A/CIRC
Shift solenoid valve B
●TCM detects an improper voltage
drop when it tries to operate the
solenoid valve.XP0755
SHIFT SOLENOID/V
BSFT SOL B/CIRC
Overrun clutch solenoid valve
●TCM detects an improper voltage
drop when it tries to operate the
solenoid valve.XP1760
OVERRUN CLUTCH
S/VO/R CLUCH SOL/
CIRC
T/C clutch solenoid valve
●TCM detects an improper voltage
drop when it tries to operate the
solenoid valve.XP0740
T/C CLUTCH SOL/V TCC SOLENOID/
CIRC
Line pressure solenoid valve
●TCM detects an improper voltage
drop when it tries to operate the
solenoid valve.XP0745
LINE PRESSURE S/
VL/PRESS SOL/CIRC
Throttle position sensor (Accelerator Pedal
Position (APP) sensor)
●TCM receives an excessively low
or high voltage from the sensor.
XP1705
THROTTLE POSI
SENTP SEN/CIRC A/T
Engine speed signal
●TCM does not receive the proper
voltage signal from the ECM.X P0725
ENGINE SPEED SIG

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
AT-43
[EURO-OBD]
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X: Applicable
—: Not applicable
*1: These malfunctions cannot be displayed by MI if another malfunction is assigned to lamp MI.
*2: Refer to AT- 4 1 , "
Malfunction Indicator (MI)" .
*3: A/T COMM LINE means CAN COMM LINE in this model.
DATA MONITOR MODE (A/T)
A/T fluid temperature sensor●TCM receives an excessively low
or high voltage from the sensor.
X P0710
BATT/FLUID TEMP
SENATF TEMP SEN/
CIRC
Engine control
●The ECM-A/T communication line
is open or shorted.X U1000
A/T COMM LINE
*3—
TCM (RAM)
●TCM memory (RAM) is malfunc-
tioning.
——
CONTROL UNIT
(RAM)—
TCM (ROM)
●TCM memory (ROM) is malfunc-
tioning.
——
CONTROL UNIT
(ROM)—
TCM (EEP ROM)
●TCM memory (EEP ROM) is mal-
functioning.
——
CONT UNIT (EEP
ROM)—
Initial start
●This is not a malfunction message
(Whenever shutting off a power
supply to the TCM, this message
appears on the screen.)X— INITIAL START
—
No failure
(NO SELF DIAGNOSTIC FAILURE INDI-
CATED FURTHER TESTING MAY BE
REQUIRED**)
●No failure has been detected.
XX Detected items
(Screen terms for CONSULT-II, “SELF
DIAGNOSIS” test mode)
Malfunction is detected when...TCM self-diagnosis EURO-OBD (DTC)
Available by O/D OFF
indicator lamp or “A/T”
on CONSULT-IIAvailable by malfunc-
tion indicator*
2 ,
“ENGINE” on CON-
SULT-II or GST “A/T” “ENGINE”
Item DisplayMover to center Monitor items
Description Remarks TCM
Input
signalsCAN
comm
sig-
nalsMain
signalsSelection
from
menu
Vehicle speed
sensor 1 (A/T)
(Revolution sen-
sor)VHCL/S SE·A/T
[km/h] or [mph]
X——
●Vehicle speed com-
puted from signal of
revolution sensor is
displayed.When racing engine in N
or P with vehicle station-
ary, CONSULT-II data
may not indicate 0 km/h
(0 mph).
Vehicle speed
sensor 2
(Meter)VHCL/S
SE·MTR
[km/h] or [mph]
X——
●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 indi-
cate 0 km/h (0 mph)
when vehicle is station-
ary.