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
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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
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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
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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 straineroil pumppressure 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
TROUBLE DIAGNOSIS
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Symptom ChartECS00FX8
lThe diagnostic item numbers show the sequence for inspection. Inspect in order from item 1.
lOverhaul and inspect inside the A/T only if A/T fluid condition is NG. Refer toAT-43, "A/T Fluid Con-
dition Check".
No. Items Symptom Condition Diagnostic ItemReference
page
1
Shift
ShockLarge shock. (“N”®“D”
position)
Refer toAT-180,
"Large Shock (“N”to
“D”Position)".ON vehicle1. Engine idle speedEC-38
2. Engine speed signalAT-108
3. Accelerator pedal position sensorAT- 11 6
4. Control cable adjustmentAT- 2 11
5. A/T fluid temperature sensorAT- 11 8
6. ATF pressure switch 1 and front brake solenoid valveAT-156,
AT-137
7. CAN communication lineAT- 9 1
8. A/T fluid level and stateAT- 4 3
9. Line pressure testAT- 4 4
10. Control valve with TCMAT-218
OFF vehicle11. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer toAT- 1 4 , "Cross-
Sectional View (2WD Models)",AT- 1 5 , "Cross-Sectional View
(4WD Models)".)AT-263
2Shock is too large
when changing D1
®D2.ON vehicle1. Accelerator pedal position sensorAT- 11 6
2. Control cable adjustmentAT- 2 11
3. ATF pressure switch 5 and direct clutch solenoid valveAT-160,
AT-142
4. CAN communication lineAT- 9 1
5. Engine speed signalAT-108
6. Turbine revolution sensorAT-123
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT-103,
AT-125
8. A/T fluid level and stateAT- 4 3
9. Control valve with TCMAT-218
OFF vehicle 10. Direct clutchAT-298
3Shock is too large
when changing D2
®D3.ON vehicle1. Accelerator pedal position sensorAT- 11 6
2. Control cable adjustmentAT- 2 11
3. ATF pressure switch 6 and high and low reverse clutch
solenoid valveAT-162,
AT-147
4. CAN communication lineAT- 9 1
5. Engine speed signalAT-108
6. Turbine revolution sensorAT-123
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT-103,
AT-125
8. A/T fluid level and stateAT- 4 3
9. Control valve with TCMAT-218
OFF vehicle 10. High and low reverse clutchAT-296
AT-54
TROUBLE DIAGNOSIS
4
Shift
ShockShockistoolarge
when changing D3
®D4.ON vehicle1. Accelerator pedal position sensorAT- 11 6
2. Control cable adjustmentAT- 2 11
3. ATF pressure switch 3 and input clutch solenoid valveAT- 1 5 8,
AT- 1 3 2
4. CAN communication lineAT- 9 1
5. Engine speed signalAT- 1 0 8
6. Turbine revolution sensorAT- 1 2 3
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 3,
AT- 1 2 5
8. A/T fluid level and stateAT- 4 3
9. Control valve with TCMAT- 2 1 8
OFF vehicle 10. Input clutchAT- 2 8 6
5Shockistoolarge
when changing D4
®D5.ON vehicle1. Accelerator pedal position sensorAT- 11 6
2. Control cable adjustmentAT- 2 11
3. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 6,
AT- 1 3 7
4. CAN communication lineAT- 9 1
5. Engine speed signalAT- 1 0 8
6. Turbine revolution sensorAT- 1 2 3
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 3,
AT- 1 2 5
8. A/T fluid level and stateAT- 4 3
9. Control valve with TCMAT- 2 1 8
OFF vehicle10. Front brake (brake band)AT- 2 5 111. Input clutchAT- 2 8 6
6Shockistoolargefor
downshift when accel-
erator pedal is
pressed.ON vehicle1. Accelerator pedal position sensorAT- 11 6
2. Control cable adjustmentAT- 2 11
3. CAN communication lineAT- 9 1
4. Engine speed signalAT- 1 0 8
5. Turbine revolution sensorAT- 1 2 3
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 3,
AT- 1 2 5
7. A/T fluid level and stateAT- 4 3
8. Control valve with TCMAT- 2 1 8
OFF vehicle9. Front brake (brake band)AT- 2 5 110. Input clutchAT- 2 8 6
11. High and low reverse clutchAT- 2 9 6
12. Direct clutchAT- 2 9 8
No. Items Symptom Condition Diagnostic ItemReference
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