engine NISSAN NAVARA 2005 Repair Owner's Manual

A/T CONTROL SYSTEM
AT-33
D
E
F
G
H
I
J
K
L
MA
B
AT
Control ValveECS00FWP
FUNCTION OF CONTROL VALVE
FUNCTION OF PRESSURE SWITCH
Name Function
Torque converter regulator valveIn order to prevent the pressure supplied to the torque converter from being excessive, the
line pressure is adjusted to the optimum pressure (torque converter operating pressure).
Pressure regulator valve
Pressure regulator plug
Pressure regulator sleeveAdjusts the oil discharged from the oil pump to the optimum pressure (line pressure) for
the driving state.
Front brake control valveWhen the front brake is coupled, adjusts the line pressure to the optimum pressure (front
brake pressure) and supplies it to the front brake. (In 1st, 2nd, 3rd, and 5th gears, adjusts
theclutchpressure.)
Accumulator control valveAdjusts the pressure (accumulator control pressure) acting on the accumulator piston and
low coast reducing valve to the pressure appropriate to the driving state.
Pilot valve AAdjusts the line pressure and produces the constant pressure (pilot pressure) required for
line pressure control, shift change control, and lock-up control.
Pilot valve BAdjusts the line pressure and produces the constant pressure (pilot pressure) required for
shift change control.
Low coast brake switching valve During engine braking, supplies the line pressure to the low coast brake reducing valve.
Low coast brake reducing valveWhen the low coast brake is coupled, adjusts the line pressure to the optimum pressure
(low coast brake pressure) and supplies it to the low coast brake.
N-R accumulator Produces the stabilizing pressure for when N-R is selected.
Direct clutch piston switching valve Operates in 4th gear and switches the direct clutch coupling capacity.
High and low reverse clutch control valveWhen the high and low reverse clutch is coupled, adjusts the line pressure to the optimum
pressure (high and low reverse clutch pressure) and supplies it to the high and low reverse
clutch. (In 1st, 3rd, 4th and 5th gears, adjusts the clutch pressure.)
Input clutch control valveWhen the input clutch is coupled, adjusts the line pressure to the optimum pressure (input
clutch pressure) and supplies it to the input clutch. (In 4th and 5th gears, adjusts the clutch
pressure.)
Direct clutch control valveWhen the direct clutch is coupled, adjusts the line pressure to the optimum pressure
(direct clutch pressure) and supplies it to the direct clutch. (In 2nd, 3rd, and 4th gears,
adjusts the clutch pressure.)
TCC control valve
TCC control plug
TCC control sleeveSwitches the lock-up to operating or released. Also, by performing the lock-up operation
transiently, lock-up smoothly.
Torque converter lubrication valveOperates during lock-up to switch the torque converter, cooling, and lubrication system oil
path.
Cool bypass valve Allows excess oil to bypass cooler circuit without being fed into it.
Line pressure relief valve Discharges excess oil from line pressure circuit.
N-D accumulator Produces the stabilizing pressure for when N-D is selected.
Manual valveSends line pressure to each circuit according to the select position. The circuits to which
the line pressure is not sent drain.
Name Function
ATFpressureswitch1(FR/B)Detects any malfunction in the front brake hydraulic pressure. When it detects any malfunction,
it puts the system into fail-safe mode.
ATFpressureswitch2(LC/B)Detects any malfunction in the low coast brake hydraulic pressure. When it detects any mal-
function, it puts the system into fail-safe mode.
ATFpressureswitch3(I/C)Detects any malfunction in the input clutch hydraulic pressure. When it detects any malfunction,
it puts the system into fail-safe mode.
ATF pressure switch 5 (D/C)Detects any malfunction in the direct clutch hydraulic pressure. When it detects any malfunc-
tion, it puts the system into fail-safe mode.
ATF pressure switch 6 (HLR/C)Detects any malfunction in the high and low reverse clutch hydraulic pressure. When it detects
any malfunction, it puts the system into fail-safe mode.

AT-34
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
PFP:00004
DTC Inspection Priority ChartECS00FWV
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC “U1000 CAN COMM CIRCUIT” is displayed with other DTCs, first perform the trouble diagnosis
for “DTC U1000 CAN COMMUNICATION LINE”. Refer toAT-91
.
Fail-safeECS00FWW
The TCM has an electrical fail-safe mode. This mode makes it possible to operate even if there is an error in a
main electronic control input/output signal circuit. In fail-safe mode A/T is fixed in 2nd, 4th or 5th (depending
on the breakdown position), so the customer should feel “slipping” or “poor acceleration”.
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. Therefore, the customer's vehicle has returned to normal, so handle according toAT- 3 7 ,
"WORK FLOW".
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 A/T
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 is prohibited.
Accelerator Pedal Position Sensor
If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM according
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.
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

TROUBLE DIAGNOSIS
AT-35
D
E
F
G
H
I
J
K
L
MA
B
AT
A/T Interlock
lIf there is an A/T interlock judgment malfunction, the A/T is fixed in 2nd gear to make driving possible.
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.
lWhen the coupling pattern below is detected, the fail-safe action corresponding to the pattern is per-
formed.
A/T INTERLOCK COUPLING PATTERN TABLE
l: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 malfunction (electrical or functional) occurs, in order to make driving possible. If the solenoid is ON,
the A/T is held in 2nd gear. If the solenoid is OFF, the A/T is held in 4th gear. (Engine brake is not applied in
1st and 2nd gear.)
Input Clutch Solenoid
If a malfunction (electrical or functional) occurs with the solenoid either ON or OFF, the A/T is held in 4th gear
to make driving possible.
Direct Clutch Solenoid
If a malfunction (electrical or functional) occurs with the solenoid either ON or OFF, the A/T is held in 4th gear
to make driving possible.
Front Brake Solenoid
If a malfunction (electrical or functional) occurs with the solenoid ON, in order to make driving possible, the A/
T is held in 5th gear. If the solenoid is OFF, the A/T 4th gear.
High and Low Reverse Clutch Solenoid
If a malfunction (electrical or functional) occurs with the solenoid either ON or OFF, the A/T 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 is prohibited.
Gear positionATF pressure switch output
Fail-safe
functionClutch 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 interlock
coupling pat-
tern3rd – X X –lHeld in
2nd gearOFF OFF ON OFF OFF OFF
4th – X X –lHeld in
2nd gearOFF OFF ON OFF OFF OFF
5th X X – XlHeld in
2nd gearOFF OFF ON OFF OFF OFF

AT-36
TROUBLE DIAGNOSIS
How to Perform Trouble Diagnosis for Quick and Accurate Repair
ECS00FWX
INTRODUCTION
The TCM receives a signal from the vehicle speed sensor, accelera-
tor pedal position sensor or PNP switch and provides shift control or
lock-up control via A/T solenoid valves.
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 a circuit tester connected should be performed.
Follow theAT-37, "
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 WORKSFEET” as
shown on the example (Refer toAT-38
) 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-38
TROUBLE DIAGNOSIS
DIAGNOSTIC WORKSHEET
Information from Customer
KEY POINTS
lWHAT..... Vehicle & A/T model
lWHEN..... Date, Frequencies
lWHERE..... Road conditions
lHOW..... Operating conditions, Symptoms
Diagnostic Worksheet Chart
Customer name MR/MS Model & Year VIN
Trans. Model Engine Mileage
Malfunction Date Manuf. Date In Service Date
FrequencyoContinuousoIntermittent (times a day)
SymptomsoVehicle does not move. (oAny positionoParticular position)
oNo up-shift (o1st®2ndo2nd®3rdo3rd®4tho4th®5th)
oNo down-shift (o5th®4tho4th®3rdo3rd®2ndo2nd®1st)
oLock-up malfunction
oShift point too high or too low.
oShift shock or slip (oN®DoLock-upoAny drive position)
oNoise or vibration
oNo kick down
oNo pattern select
oOthers
()
OD OFF indicator lampoContinuously litoNot lit
1oRead the item on cautions concerning fail-safe and understand the customer's complaint.AT- 3 4
2oA/T fluid inspectionAT- 4 3oLeak (Repair leak location.)
oState
oAmount
3oStall test and line pressure testAT- 4 3
AT- 4 4oStall te st
oTorque converter one-way clutch
oFront brake
oHigh and low reverse clutch
oLow coast brake
oForward brake
oReverse brake
oForward one-way clutcho1st one-way clutch
o3rd one-way clutch
oEngine
oLine pressure low
oExcept for input clutch and direct
clutch, clutches and brakes OK
oLine pressure inspection - Suspected part:

TROUBLE DIAGNOSIS
AT-39
D
E
F
G
H
I
J
K
L
MA
B
AT
4oPerform all road tests and enter checks in required inspection items.AT- 4 6
4-1.Check Before Engine Is StartedAT- 4 6
oAT- 1 7 7 , "OD OFF Indicator Lamp Does Not Come On"
oPerform self-diagnosis. Enter checks for detected items.AT- 8 0,AT- 8 9
oAT-91, "DTC U1000 CAN COMMUNICATION LINE"
oAT-94, "DTC P0615 START SIGNAL CIRCUIT"
oAT-98, "DTC P0700 TCM"
oAT-99, "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
oAT-103, "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)"
oAT-108, "DTC P0725 ENGINE SPEED SIGNAL"
oAT-110, "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE"
oAT-112, "DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)"
oAT-114, "DTC P0745 LINE PRESSURE SOLENOID VALVE"
oAT-116, "DTC P1705 THROTTLE POSITION SENSOR"
oAT-118, "DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT"
oAT-123, "DTC P1716 TURBINE REVOLUTION SENSOR"
oAT-125, "DTC P1721 VEHICLE SPEED SENSOR MTR"
oAT-127, "DTC P1730 A/T INTERLOCK"
oAT-130, "DTC P1731 A/T 1ST ENGINE BRAKING"
oAT-132, "DTC P1752 INPUT CLUTCH SOLENOID VALVE"
oAT-134, "DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION"
oAT-137, "DTC P1757 FRONT BRAKE SOLENOID VALVE"
oAT-139, "DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION"
oAT-142, "DTC P1762 DIRECT CLUTCH SOLENOID VALVE"
oAT-144, "DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION"
oAT-147, "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE"
oAT-149, "DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
FUNCTION"
oAT-152, "DTC P1772 LOW COAST BRAKE SOLENOID VALVE"
oAT-154, "DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION"
oAT-156, "DTC P1841 ATF PRESSURE SWITCH 1"
oAT-158, "DTC P1843 ATF PRESSURE SWITCH 3"
oAT-160, "DTC P1845 ATF PRESSURE SWITCH 5"
oAT-162, "DTC P1846 ATF PRESSURE SWITCH 6"
4-2.Check at IdleAT- 4 7
oAT- 1 7 7 , "Engine Cannot Be Started in“P”or“N”Position"
oAT- 1 7 8 , "In“P”Position, Vehicle Moves When Pushed"
oAT- 1 7 9 , "In“N”Position, Vehicle Moves"
oAT- 1 8 0 , "Large Shock (“N”to“D”Position)"
oAT- 1 8 2 , "Vehicle Does Not Creep Backward in“R”Position"
oAT- 1 8 4 , "Vehicle Does Not Creep Forward in“D”Position"
4-3.Cruise TestAT- 4 8
Part 1
oAT- 1 8 6 , "
Vehicle Cannot Be Started from D1"
oAT- 1 8 8 , "A/T Does Not Shift: D1®D2"
oAT- 1 9 0 , "A/T Does Not Shift: D2®D3"
oAT- 1 9 2 , "A/T Does Not Shift: D3®D4"
oAT- 1 9 4 , "A/T Does Not Shift: D4®D5"
oAT- 1 9 6 , "A/T Does Not Perform Lock-up"
oAT- 1 9 7 , "A/T Does Not Hold Lock-up Condition"
oAT- 1 9 9 , "Lock-up Is Not Released"
oAT- 1 9 9 , "Engine Speed Does Not Return to Idle"

AT-40
TROUBLE DIAGNOSIS
44-3Part 2AT- 5 0
oAT-186, "Vehicle Cannot Be Started from D1"
oAT-188, "A/T Does Not Shift: D1®D2"
oAT-190, "A/T Does Not Shift: D2®D3"
oAT-192, "A/T Does Not Shift: D3®D4"
Part 3AT- 5 1
oAT-200, "A/T Does Not Shift: 5th Gear®4th Gear"
oAT-202, "A/T Does Not Shift: 4th Gear®3rd Gear"
oAT-203, "A/T Does Not Shift: 3rd Gear®2nd Gear"
oAT-204, "A/T Does Not Shift: 2nd Gear®1st Gear"
oAT-206, "Vehicle Does Not Decelerate by Engine Brake"
oPerform self-diagnosis. Enter checks for detected items.AT- 8 0,AT- 8 9
oAT- 9 1 , "DTC U1000 CAN COMMUNICATION LINE"
oAT- 9 4 , "DTC P0615 START SIGNAL CIRCUIT"
oAT- 9 8 , "DTC P0700 TCM"
oAT- 9 9 , "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
oAT-103, "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)"
oAT-108, "DTC P0725 ENGINE SPEED SIGNAL"
oAT- 11 0 , "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE"
oAT- 11 2 , "DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)"
oAT- 11 4 , "DTC P0745 LINE PRESSURE SOLENOID VALVE"
oAT- 11 6 , "DTC P1705 THROTTLE POSITION SENSOR"
oAT- 11 8 , "DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT"
oAT-123, "DTC P1716 TURBINE REVOLUTION SENSOR"
oAT-125, "DTC P1721 VEHICLE SPEED SENSOR MTR"
oAT-127, "DTC P1730 A/T INTERLOCK"
oAT-130, "DTC P1731 A/T 1ST ENGINE BRAKING"
oAT-132, "DTC P1752 INPUT CLUTCH SOLENOID VALVE"
oAT-134, "DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION"
oAT-137, "DTC P1757 FRONT BRAKE SOLENOID VALVE"
oAT-139, "DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION"
oAT-142, "DTC P1762 DIRECT CLUTCH SOLENOID VALVE"
oAT-144, "DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION"
oAT-147, "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE"
oAT-149, "DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
FUNCTION"
oAT-152, "DTC P1772 LOW COAST BRAKE SOLENOID VALVE"
oAT-154, "DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION"
oAT-156, "DTC P1841 ATF PRESSURE SWITCH 1"
oAT-158, "DTC P1843 ATF PRESSURE SWITCH 3"
oAT-160, "DTC P1845 ATF PRESSURE SWITCH 5"
oAT-162, "DTC P1846 ATF PRESSURE SWITCH 6"
5oInspect each system for items found to be NG in the self-diagnosis and repair or replace the malfunctioning parts.
6oPerform all road tests and enter the checks again for the required items.AT- 4 6
7oFor any remaining NG items, perform the “Diagnosis Procedure” and repair or replace the malfunctioning
parts. See the chart for diagnosis by symptoms. (This chart also contains other symptoms and inspection pro-
cedures.)AT- 5 3
8oErase the results of the self-diagnostics from TCM.AT- 8 2AT- 9 0

TROUBLE DIAGNOSIS
AT-43
D
E
F
G
H
I
J
K
L
MA
B
AT
Inspections Before Trouble DiagnosisECS00FX0
A/T FLUID CHECK
A/T Fluid Leakage and A/T Fluid Level Check
Inspect for A/T fluid leakage and check the A/T fluid level. Refer toAT-12, "Checking A/T Fluid".
A/T Fluid Condition Check
Inspect the A/T fluid condition.
STALL TEST
Stall Test Procedure
1. Inspect the amount of engine oil. Replenish the engine oil if necessary.
2. Drive for about 10 minutes to warm up the vehicle so that the A/
Tfluidtemperatureis50to80°C(122to176°F). Inspect the
amount of ATF. Replenish if necessary.
3. Securely engage the parking brake so that the tires do not turn.
4. Engine start, apply foot brake, and place selector lever in “D”
position.
5. While holding down the foot brake, gradually press down the
accelerator pedal.
6. Quickly read off the stall speed, then quickly remove your foot
from the accelerator pedal.
CAUTION:
Do not hold down the accelerator pedal for more than 5 sec-
onds during this test.
7. Move selector lever to the “N” position.
8. Cool down the ATF.
Fluid condition Conceivable Cause Required Operation
Varnished (viscous
varnish state)Clutch, brake
scorchedReplace the ATF and check the A/T
main unit and the vehicle for mal-
functions (wire harnesses, cooler
pipes, etc.)
Milky white or cloudy Water in the fluidReplace the ATF and check for
places where water is getting in.
Large amount of
metal powder mixed
inUnusual wear of
sliding parts within
A/TReplace the ATF and check for
improper operation of the A/T.
SAT638A
SAT647B
SAT513G
Stall speed: 2,700 - 3,100 rpm
SAT514G

AT-44
TROUBLE DIAGNOSIS
CAUTION:
Run the engine at idle for at least 1 minute.
9. Repeat steps 5 through 8 with selector lever in “3”, “2”, “1” and “R” positions.
Judgement of Stall Test
O: Stall speed within standard value position
H: Stall speed higher than standard value
L: Stall speed lower than standard value
Stall test standard value position
LINE PRESSURE TEST
Line Pressure Test Port
Line Pressure Test Procedure
1. Inspect the amount of engine oil and replenish if necessary.
2. Drive the car for about 10 minutes to warm it up so that the ATF reaches in range of 50 to 80°C(122to
176°F), then inspect the amount of ATF and replenish if necessary.
NOTE:
The A/T fluid temperature rises in range of 50 to 80°C (122 to 176°F) during 10 minutes of driving.
3. After warming up remove the oil pressure detection plug and
install the oil pressure gauge (ST2505S001).
CAUTION:
When using the oil pressure gauge, be sure to use O-ring
attached to the oil pressure detection plug.
Selector lever position
Expected problem location
“D”, “3”, “2”
and “1”“R”
Stall rotationHO
lForward brake
lForward one-way clutch
l1st one-way clutch
l3rd one-way clutch
OH
lReverse brake
LL
lEngine and torque converter one-way clutch
HH
lLine pressure low
Does not shift-up “D” position 1®2 Slipping in 2nd, 3rd or 4th gear Direct clutch slippage
Does not shift-up “D” position 2®3 Slipping in 3rd, 4th or 5th gear High and low reverse clutch slippage
Does not shift-up “D” position 3®4 Slipping in 4th or 5th gear Input clutch slippage
Does not shift-up “D” position 4®5 Slipping in 5th gear Front brake slippage
SCIA2187E
SCIA0574E

TROUBLE DIAGNOSIS
AT-45
D
E
F
G
H
I
J
K
L
MA
B
AT
4. Securely engage the parking brake so that the tires do not turn.
5. Start the engine, then measure the line pressure at both idle and
the stall speed.
CAUTION:
lKeep the brake pedal pressed all the way down during
measurement.
lWhen measuring the line pressure at the stall speed.
Refer toAT-43, "
STALL TEST".
6. After the measurements are complete, install the oil pressure
detection plug and tighten to the specified torque. Refer toAT-
251, "Components".
CAUTION:
lDo not reuse O-ring.
lApply ATF to O-ring.
Line Pressure
Judgement of Line Pressure Test
SAT513G
SAT493G
Engine speedLine pressure [kPa (bar, kg/cm
2,psi)]
“R” position “D” position
At idle speed 425 - 465 (4.3 - 4.6, 4.3 - 4.7, 62 - 67) 379 - 428 (3.8 - 4.3, 3.9 - 4.4, 55 - 62)
At stall speed 1,605 - 1,950 (16.0 - 19.5, 16.4 - 19.9, 233 - 283) 1,310 - 1,500 (13.1 - 15.0, 13.4 - 15.3, 190 - 218)
Judgement Possible cause
Idle speedLow for all positions
(“P”, “R”, “N” and “D”)Possible causes include malfunctions in the pressure supply system and low oil pump output.
For example
lOil pump wear
lPressure regulator valve or plug sticking or spring fatigue
lOil strainer
oil pump
pressure regulator valve passage oil leak
lEngine idle speed too low
Only low for a specific
positionPossible causes include an oil pressure leak in a passage or device related to the position
after the pressure is distributed by the manual valve.
HighPossible causes include a sensor malfunction or malfunction in the line pressure adjustment
function.
For example
lAccelerator pedal position signal malfunction
lA/T fluid temperature sensor malfunction
lLine pressure solenoid malfunction (sticking in OFF state, filter clog, cut line)
lPressure regulator valve or plug sticking