2005 INFINITI FX35 sensor

AT-32
A/T CONTROL SYSTEM
Revision: 2005 July 2005 FX
CAN CommunicationACS004PB
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.For details, refer to LAN-30,
"CAN Communication Unit"
Input/Output Signal of TCMACS002LH
*1: Spare for vehicle speed sensor·A/T (revolution sensor)
*2: Spare for accelerator pedal position signal
*3: If these input and output signals are different, the TCM triggers the fail-safe function.
*4: Used as a condition for starting self-diagnostics; if self-diagnostics are not started, it is judged that there is some kin d of error.
*5: Input by CAN communications
*6: Output by CAN communications Control item
Line
pressure control Vehicle
speed
control Shift
control Lock-up
control Engine
brake
control Fail-safe
function (*3) Self-diag-
nostics
function
Input Accelerator pedal position signal
(*5)XXXXXXX
Vehicle speed sensor A/T
(revolution sensor) XXXXXXX
Vehicle speed sensor MTR
(*1) (*5)X
Closed throttle position signal
(*5)X (*2) X X X X (*4)
Wide open throttle position signal
(*5)XX (*4)
Turbine revolution sensor 1 X X X X X
Turbine revolution sensor 2
(for 4th speed only) XXXXX
Engine speed signals
(*5)XXXXXXX
Stop lamp switch signal
(*5)XXX X (*4)
A/T fluid temperature sensors 1, 2 X X X X X X
ASCD or
ICC Operation signal
(*5)XXX
Overdrive cancel
signal
(*5)X
Out-
put Direct clutch solenoid (ATF pres-
sure switch 5) XX XX
Input clutch solenoid (ATF pressure
switch 3) XX XX
High and low reverse clutch sole-
noid (ATF pressure switch 6) XX XX
Front brake solenoid (ATF pressure
switch 1) XX XX
Low coast brake solenoid (ATF
pressure switch 2) XX XXX
Line pressure solenoid XXXXXXX
TCC solenoid X X X
Self-diagnostics table
(*6)X
Starter relay XX

AT-34
A/T CONTROL SYSTEM
Revision: 2005 July 2005 FX
During Shift Change
The necessary and adequate line pressure for shift change is set.
For this reason, line pressure pattern setting corresponds to input
torque and gearshift selection. Also, line pressure characteristic is
set according to engine speed, during engine brake operation.
At Low Fluid Temperature
When the A/T fluid temperature drops below the prescribed tempera-
ture, in order to speed up the action of each friction element, the line
pressure is set higher than the normal line pressure characteristic.
Shift ControlACS002LJ
The clutch pressure control solenoid is controlled by the signals from the switches and sensors. Thus, the
clutch pressure is adjusted to be appropriate to the engine load state and vehicle driving state. It becomes
possible to finely control the clutch hydraulic pressure with high precision and a smoother shift change charac-
teristic is attained.
PCIA0010E
PCIA0011E
PCIA0012E

ON BOARD DIAGNOSTIC (OBD) SYSTEM AT-39
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ON BOARD DIAGNOSTIC (OBD) SYSTEMPFP:00028
IntroductionACS002LN
The A/T system has two self-diagnostic systems.
The first is the emission-related on board diagnostic system (OBD-II) performed by the TCM in combination
with the ECM. The malfunction is indicated by the MIL (malfunction indicator lamp) 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 A/T CHECK indicator lamp. The malfunction is
stored in the TCM memory. The detected items are overlapped with OBD-II self-diagnostic items. For detail,
refer to AT- 9 3 , "
Display Items List" .
OBD-II Function for A/T SystemACS002LO
The ECM provides emission-related on board diagnostic (OBD-II) functions for the A/T system. One function
is to receive a signal from the TCM used with OBD-related parts of the A/T system. The signal is sent to the
ECM when a malfunction occurs in the corresponding OBD-related part. The other function is to indicate a
diagnostic result by means of the MIL (malfunction indicator lamp) on the instrument panel. Sensors, switches
and solenoid valves are used as sensing elements.
The MIL automatically illuminates in “One or Two Trip Detection Logic” when a malfunction is sensed in rela-
tion to A/T system parts.
One or Two Trip Detection Logic of OBD-IIACS002LP
ONE TRIP DETECTION LOGIC
If a malfunction is sensed during the first test drive, the MIL 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 MIL will not illuminate. — 1st trip
If the same malfunction as that experienced during the first test drive is sensed during the second test drive,
the MIL will illuminate. — 2nd trip
The “Trip” in the “One or Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation.
OBD-II Diagnostic Trouble Code (DTC)ACS002LQ
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, P0720 etc.
These DTC are prescribed by SAE J2012.
(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, CONSULT-II (if available) is recom-
mended.
A sample of CONSULT-II display for DTC and 1st trip DTC is shown
on the next page. DTC or 1st trip DTC of a malfunction is displayed
in SELF-DIAGNOSTIC RESULTS mode for “ENGINE” with CON-
SULT-II. Time data indicates how many times the vehicle was driven
after the last detection of a DTC.
BCIA0030E

TROUBLE DIAGNOSIS AT-43
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TROUBLE DIAGNOSISPFP:00004
DTC Inspection Priority ChartACS002LS
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC U1000 is displayed with other DTCs, first perform the trouble diagnosis for DTC U1000. Refer to
AT- 1 0 6
.
Fail-safeACS002LT
The TCM has an electrical fail-safe mode. This mode makes it possible to operate even if there is a an error in
a main electronic control input/output signal circuit.
In fail-safe mode, even if the selector lever is “D” or “M” mode, the transmission is fixed in 2nd, 4th or 5th
(depending on the breakdown position), so the customer should feel “slipping” or “poor acceleration”. When
fail-safe mode is triggered, when the ignition switch is switched “ON”, the A/T CHECK indicator lamp flashes
for about 8 seconds. (Refer to AT- 1 0 3 , "
TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS)" ).
Even when the electronic circuits are normal, under special conditions (for example, when slamming on the
brake with the wheels spinning drastically and stopping the tire rotation), the transmission can go into fail-safe
mode. If this happens, switch OFF the ignition switch for 10 seconds, then switch it ON again to return to the
normal shift pattern. Also, the A/T CHECK indicator lamp flashes for about 8 seconds once, then is cleared.
Therefore, the customer's vehicle has returned to normal, so handle according to the “WORK FLOW” (Refer to
AT- 4 6
).
FAIL-SAFE FUNCTION
If any malfunction occurs in a sensor or solenoid, this function controls the A/T to mark driving possible.
Vehicle Speed Sensor

Signals are input from two systems - from vehicle speed sensor A/T (revolution sensor) installed on the
transmission and from combination meter so normal driving is possible even if there is a malfunction in
one of the systems. And if vehicle speed sensor A/T (revolution sensor) has unusual cases, 5th gear and
manual mode are prohibited.
Accelerator Pedal Position Sensor

If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM accord-
ing to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow
systems, the engine speed is fixed by ECM to a pre-determined engine speed to make driving possible.
Throttle Position Sensor

If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM accord-
ing to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow
systems, the accelerator opening angle is controlled by the idle signal sent from the ECM which is based
on input indicating either idle condition or off-idle condition (pre-determined accelerator opening) in order
to make driving possible.
PNP Switch

In the unlikely event that a malfunction signal enters the TCM, the position indicator is switched OFF, the
starter relay is switched OFF (starter starting is disabled), the back-up lamp relay switched OFF (back-up
lamp is OFF) and the position is fixed to the “D” position to make driving possible.
Starter Relay

The starter relay is switched OFF. (Starter starting is disabled.)
Priority Detected items (DTC)
1 U1000 CAN communication line
2 Except above

AT-44
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
A/T Interlock

If there is an A/T interlock judgment malfunction, the transmission is fixed in 2nd gear to make driving pos-
sible.
NOTE:
When the vehicle is driven fixed in 2nd gear, a turbine revolution sensor malfunction is displayed,
but this is not a turbine revolution sensor malfunction.

When the coupling pattern below is detected, the fail-safe action corresponding to the pattern is per-
formed.
A/T INTERLOCK COUPLING PATTERN TABLE

: NG X: OK
A/T 1st Engine Braking

When there is an A/T first gear engine brake judgment malfunction, the low coast brake solenoid is
switched OFF to avoid the engine brake operation.
Line Pressure Solenoid

The solenoid is switched OFF and the line pressure is set to the maximum hydraulic pressure to make
driving possible.
Torque Converter Clutch Solenoid

The solenoid is switched OFF to release the lock-up.
Low Coast Brake Solenoid

When a (electrical or functional) malfunction occurs, in order to make driving possible, if the solenoid is
ON, the transmission is held in 2nd gear; if the solenoid is OFF, the transmission is held in 4th gear.
(Engine brake is not applied in 1st and 2nd gear.)
Input Clutch Solenoid

If a (electrical or functional) malfunction occurs with the solenoid either ON or OFF, the transmission is
held in 4th gear to make driving possible.
Direct Clutch Solenoid

If a (electrical or functional) malfunction occurs with the solenoid either ON or OFF, the transmission is
held in 4th gear to make driving possible.
Front Brake Solenoid

If a (electrical or functional) malfunction occurs with the solenoid ON, in order to make driving possible,
the A/T is held in 5th gear; if the solenoid is OFF, 4th gear.
High and Low Reverse Clutch Solenoid

If a (electrical or functional) malfunction occurs with the solenoid either ON or OFF, the transmission is
held in 4th gear to make driving possible.
Turbine Revolution Sensor 1 or 2

The control is the same as if there were no turbine revolution sensors, 5th gear and manual mode are pro-
hibited.
Gear position ATF pressure switch output
Fail-safe function Clutch pressure output pattern after fail-safe func-
tion
SW3 (I/C) SW6
(HLR/ C) SW5
(D/C) SW1
(FR/B) SW2
(LC/B) I/C HLR/C D/C FR/B LC/B L/U
A/T inter-
lock cou-
pling pattern 3rd – X X –

Held in
2nd gear OFF OFF ON OFF OFF OFF
4th – X X –
Held in
2nd gear OFF OFF ON OFF OFF OFF
5th X X – X
Held in
2nd gear OFF OFF ON OFF OFF OFF

TROUBLE DIAGNOSIS AT-45
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How to Perform Trouble Diagnosis for Quick and Accurate RepairACS002LU
INTRODUCTION
The TCM receives a signal from the vehicle speed sensor, accelerator pedal position sensor (throttle position
sensor) or PNP switch and provides shift control or lock-up control via A/T solenoid valves.
The TCM also communicates with the ECM by means of a signal
sent from sensing elements used with the OBD-related parts of the
A/T system for malfunction-diagnostic purposes. The TCM is capa-
ble of diagnosing malfunctioning parts while the ECM can store mal-
functions in its memory.
Input and output signals must always be correct and stable in the
operation of the A/T system. The A/T system must be in good oper-
ating condition and be free of valve seizure, solenoid valve malfunc-
tion, etc.
It is much more difficult to diagnose a error that occurs intermittently
rather than continuously. Most intermittent errors are caused by poor
electric connections or improper wiring. In this case, careful check-
ing of suspected circuits may help prevent the replacement of good
parts.
A visual check only may not find the cause of the errors. A road test
with CONSULT-II (or GST) or a circuit tester connected should be
performed. Follow the AT- 4 6 , "
WORK FLOW" .
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such errors, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A “DIAGNOSTIC WORKSHEET” as
shown on the example (Refer to AT- 4 7
) should be used.
Start your diagnosis by looking for “conventional” errors first. This will
help troubleshoot driveability errors on an electronically controlled
engine vehicle.
Also check related Service bulletins.
SAT631IB
SAT632I
SEF234G

AT-48
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
4 ❏
Perform all road tests and enter checks in required inspection items. AT- 5 6
4-1. Check before engine is started
AT- 5 6
❏ The A/T CHECK Indicator Lamp does come on. AT- 1 9 3 .
❏ Perform self-diagnostics. Enter checks for detected items. AT- 9 3
,AT- 1 0 3
❏ AT-106, "DTC U1000 CAN COMMUNICATION LINE" .
❏ AT-109, "
DTC P0615 START SIGNAL CIRCUIT" .
❏ AT- 11 3 , "
DTC P0700 TCM"
❏ AT- 11 4 , "DTC P0705 PARK/NEUTRAL POSITION SWITCH" .
❏ AT- 11 8 , "
DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)" .
❏ AT-123, "
DTC P0725 ENGINE SPEED SIGNAL" .
❏ AT-125, "
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE" .
❏ AT-127, "
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)" .
❏ AT-129, "
DTC P0745 LINE PRESSURE SOLENOID VALVE" .
❏ AT-131, "
DTC P1702 TRANSMISSION CONTROL MODULE (RAM)" .
❏ AT-132, "
DTC P1703 TRANSMISSION CONTROL MODULE (ROM)" .
❏ AT-133, "
DTC P1705 THROTTLE POSITION SENSOR" .
❏ AT-136, "
DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT" .
❏ AT-141, "
DTC P1716 TURBINE REVOLUTION SENSOR" .
❏ AT-143, "
DTC P1721 VEHICLE SPEED SENSOR MTR" .
❏ AT-145, "
DTC P1730 A/T INTERLOCK" .
❏ AT-148, "
DTC P1731 A/T 1ST ENGINE BRAKING" .
❏ AT-150, "
DTC P1752 INPUT CLUTCH SOLENOID VALVE" .
❏ AT-152, "
DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION" .
❏ AT-154, "
DTC P1757 FRONT BRAKE SOLENOID VALVE" .
❏ AT-156, "
DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION" .
❏ AT-158, "
DTC P1762 DIRECT CLUTCH SOLENOID VALVE" .
❏ AT-160, "
DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION" .
❏ AT-162, "
DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE" .
❏ AT-164, "
DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
FUNCTION" .
❏ AT-166, "
DTC P1772 LOW COAST BRAKE SOLENOID VALVE" .
❏ AT-168, "
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION" .
❏ AT-170, "
DTC P1815 MANUAL MODE SWITCH" .
❏ AT-175, "
DTC P1841 ATF PRESSURE SWITCH 1" .
❏ AT-177, "
DTC P1843 ATF PRESSURE SWITCH 3" .
❏ AT-179, "
DTC P1845 ATF PRESSURE SWITCH 5" .
❏ AT-181, "
DTC P1846 ATF PRESSURE SWITCH 6" .
4-2. Check at Idle
AT- 5 7
❏ AT-194, "Engine Cannot Be Started in “P” or “N” Position" .
❏ AT-195, "
In “P” Position, Vehicle Moves When Pushed"
❏ AT-196, "In “N” Position, Vehicle Moves" .
❏ AT-197, "
Large Shock (“N” to “D” Position)" .
❏ AT-200, "
Vehicle Does Not Creep Backward in “R” Position" .
❏ AT-203, "
Vehicle Does Not Creep Forward in “D” Position" .
4-3. Cruise Test
AT- 5 8
Part 1
❏ AT-205, "
Vehicle Cannot Be Started from D1" .
❏ AT-208, "
A/T Does Not Shift: D1 → D2" .
❏ AT-210, "
A/T Does Not Shift: D2 → D3" .
❏ AT-212, "
A/T Does Not Shift: D3 → D4" .
❏ AT-215, "
A/T Does Not Shift: D4 → D5" .
❏ AT-217, "
A/T Does Not Perform Lock-up"
❏ AT-219, "A/T Does Not Hold Lock-up Condition" .
❏ AT-221, "
Lock-up Is Not Released" .
❏ AT-221, "
Engine Speed Does Not Return to Idle" .

TROUBLE DIAGNOSIS AT-49
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44-3 Part 2
AT- 6 0
❏ AT- 2 0 5 , "Vehicle Cannot Be Started from D1" .
❏ AT- 2 0 8 , "
A/T Does Not Shift: D1 → D2" .
❏ AT- 2 1 0 , "
A/T Does Not Shift: D2 → D3" .
❏ AT- 2 1 2 , "
A/T Does Not Shift: D3 → D4" .
Part 3 AT- 6 1
❏ AT- 2 2 3 , "Cannot Be Changed to Manual Mode" .
❏ AT- 2 2 3 , "
A/T Does Not Shift: 5th Gear → 4th Gear" .
❏ AT- 2 2 5 , "
A/T Does Not Shift: 4th Gear → 3rd Gear" .
❏ AT- 2 2 7 , "
A/T Does Not Shift: 3rd Gear → 2nd Gear" .
❏ AT- 2 2 9 , "
A/T Does Not Shift: 2nd Gear → 1st Gear" .
❏ AT- 2 3 1 , "
Vehicle Does Not Decelerate by Engine Brake" .
❏ Perform self-diagnostics. Enter checks for detected items. AT- 9 3
,AT- 1 0 3
❏ AT-106, "DTC U1000 CAN COMMUNICATION LINE" .
❏ AT-109, "
DTC P0615 START SIGNAL CIRCUIT" .
❏ AT-113, "
DTC P0700 TCM"
❏ AT-114, "DTC P0705 PARK/NEUTRAL POSITION SWITCH" .
❏ AT-118, "
DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)" .
❏ AT-123, "
DTC P0725 ENGINE SPEED SIGNAL" .
❏ AT-125, "
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE" .
❏ AT-127, "
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)" .
❏ AT-129, "
DTC P0745 LINE PRESSURE SOLENOID VALVE" .
❏ AT-131, "
DTC P1702 TRANSMISSION CONTROL MODULE (RAM)" .
❏ AT-132, "
DTC P1703 TRANSMISSION CONTROL MODULE (ROM)" .
❏ AT-133, "
DTC P1705 THROTTLE POSITION SENSOR" .
❏ AT-136, "
DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT" .
❏ AT-141, "
DTC P1716 TURBINE REVOLUTION SENSOR" .
❏ AT-143, "
DTC P1721 VEHICLE SPEED SENSOR MTR" .
❏ AT-145, "
DTC P1730 A/T INTERLOCK" .
❏ AT-148, "
DTC P1731 A/T 1ST ENGINE BRAKING" .
❏ AT-150, "
DTC P1752 INPUT CLUTCH SOLENOID VALVE" .
❏ AT-152, "
DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION" .
❏ AT-154, "
DTC P1757 FRONT BRAKE SOLENOID VALVE" .
❏ AT-156, "
DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION" .
❏ AT-158, "
DTC P1762 DIRECT CLUTCH SOLENOID VALVE" .
❏ AT-160, "
DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION" .
❏ AT-162, "
DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE" .
❏ AT-164, "
DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
FUNCTION" .
❏ AT-166, "
DTC P1772 LOW COAST BRAKE SOLENOID VALVE" .
❏ AT-168, "
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION" .
❏ AT-170, "
DTC P1815 MANUAL MODE SWITCH" .
❏ AT-175, "
DTC P1841 ATF PRESSURE SWITCH 1" .
❏ AT-177, "
DTC P1843 ATF PRESSURE SWITCH 3" .
❏ AT-179, "
DTC P1845 ATF PRESSURE SWITCH 5" .
❏ AT-181, "
DTC P1846 ATF PRESSURE SWITCH 6" .
5 ❏ Inspect each system for items found to be NG in the self-diagnostics and repair or replace the malfunctioning parts.
6 ❏ Perform all road tests and enter the checks again for the required items. AT- 5 6
7 ❏
For any remaining NG items, perform the “diagnostics procedure” and repair or replace the malfunctioning
parts. See the chart for diagnostics by symptoms. (This chart also contains other symptoms and inspection pro-
cedures.) AT- 6 4
8
❏ Erase the results of the self-diagnostics from the TCM. AT- 4 1,
AT-
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