auto transmission troubleshoot

5/21/2018 Auto Transmission Troubleshoot

1/26

N:\common\FLOW CHART COVERS\TRANSMISSION DIAGNOSTIC FLOW CHARTS.doc


2/26

3L80, TH400, TH475, TH37

EARLY OR

SOFT SHIFT

Check fluid level

and condition

LATE, HARSH,OR NO SHIFT

Check vacuum atmodulator - test

drive with kickdownswitch unplugged

ERRATIC

SHIFT Monitor vacuum to modulator and clean governor

LATE OR NO DOWNSHIFT ON COAST DOWN

HARSH DOWNSHIFTS Monitor vacuum at modulator

NO KICKDOWN

SLIPPING, CHATTERING,

SHUDDERING

LEAKS

From bellhousing

Cooler fittings to case

Governor cover

Breather tube

Pan

Fluid foaming

Fluid ok

Fluid burnt

Check filter and intake pipe and o-rings

Monitor vacuum at modulator - check line pressure

Unit failure

Replace governo

If harsh shift only, send valve body

Late - harsh or no shift, clean governor

In rare cases

could beinternal (pump)

problem

Send valve bodyIn rare cases, could be

modulator or modulator valve

Clean governor Send valve body

Send valve body In rare cases, may be an

internal (pump) problem

Connect test light to wire at

single-wire connector on the leftside of the trans - turn ignition

switch on - push accelerator all theway to the floor

Test light lights up

Test light doesn't light up

Send valve body

Vehicle problem - checktransmission control fuse at fuse

panel and check kickdown switch

Check fluid leveland condition On diesels, check

vacuum regulator valve

Fluid ok

Fluid burnt Unit failure

Check line pressure and p

Extension housing

Slinging around bellhousing

Just running out Check pump bolts and seal - check for tool gauge in sealing area

Check converter for cracks

Check for cracked case Use sealer (liquid only) on fitting threads

Check bolt torque Make sure cover is flat Reseal

Fluid level over filled Overheating or restricted cooler Internal problem

Check bolt torque Check for warped or bent pan rail

Check seal bushing and for tool gouges in the seal tohousing area - check yoke for wear or burrs

Warranty coverage onseal for one time only

CONTINUED NEXT PAGE n:\common\pdq\flowtran\3L80


3/26

3L80, TH400, TH475, TH375 - cont

Line pressure specs: If kickdown switch is activated,

pressure will be 90 - 110 psi. The

Neutral @ 1000rpm / 55 - 70 psi pressure regulator and boost valve

Drive @ 1000 rpm / 60 - 90 psi are in the pump

Reverse @ 1000 rpm 95 - 150 psi

NOISE

From bellhousing

In all gears except 3rd

In all gears - changes with road speed

Pump or converter failure

Planetary failure

Check driveline Possible internal failure

ENGAGEMENT

PROBLEMS

Check fluid leveland condition

Delayed Check manual valve adjustment

Check VRV

on diesels

Harsh Possible internal proCheck vacuum at modulator -

if ok, check line pressure

Soft or slipping on engagement Internal problem

Fluid burnt Internal problem

n:\common\pdq\flowtran\3L80two

Most likely an internal failure


4/26

4L60E

EARLY OR

SOFT SHIFT

Pull codes,check fluid level

and condition

If 95 or 96,model, check

build date

Built between

8/95 and 2/14/96

See Bulletin #66-71-03 andrepair accordingly

Fluid burnt

LATE, HARSH,

OR NO SHIFT

Pull codes,

check fluid leveland condition

Fluid burnt

Fluid ok

Internal Problem

Sweep TPS and check VSS signal,

check for updated PCM calibrations

If it sets a clip code, check VSS circuitbefore replacing unit

Send valve

bodyInternal pro

ERRATIC

SHIFT

Pull codes,

check fluidlevel and

condition

Fluid burnt

Fluid ok

Internal problem

Check wiring

connectors

Sweep TPS andcheck VSS signal

Send valvebody

Internalproblem

LATE OR NODOWNSHIFT ON

COAST DOWN

Stuck in 3rd gearuntil vehicle is

shut off?

Yes

No

Pull codes, look for 3 - 2

solenoid code

Pull codes, look for

solenoid codes

Send 3 - 2 solenoid

Solenoid codes , send all shift

solenoids

No solenoid codes - send valve

body and Tran X

T

HARSHDOWNSHIFTS


and condition

Fluid burnt

Fluid ok

Internal problem

High pressure may becaused by a trouble code

Send

valvebody

Possible

vehicleproblem

Internal problem

NO KICKDOWN Pull codes, check fluid

level and condition

Check TPS voltage range and make

sure accelerator linkage has full travelSend valve body

Ask Trans

SLIPPING, CHATTERING, SHUDDERINGIf vehicle was built between

8/95 and 2/14/96, see Bulletin66-71-03 and repair accordingly


and condition

Pull pan toconfirm if

internal problem

Ask

T

LEAKS

From bellhousing

From vent tube

From servo cover

From governor cover

From pan

Check front seal and pump bushing, check converter for cracks

Fluid level over-filled Internal problem

Servo cover seal, check case for cracks or gouges

Reseal cover, check case for cracks or gouges

Repair, check pan rail for warpageCONTINUE NEXT PAGE

n:\common\pdq\flowtran\4L60E 4


5/26

NOISE

From bellhousing


In all gears

Pump problem

Planetary failure

Make sure it's not a vehicle problem Ask Trans Tech

ENGAGEMENTPROBLEMS

Harsh

Soft

Delayed

Harsh, soft, or delayed - fluid burnt

4L60ECONTINUE

Pull codes

Pull

codes

May be caused by a trouble code Ask Trans Tech

Check linkage

adjustment

Ask Trans Tech

Unit failure

Pressure regulator valve and boost valve are in the pump.

n:\common\pdq\flowtran\4L60E2nd 4


6/26

4L80E

EARLY OR SOFT SHIFT Pull codes Check line pressure Ask Trans Tech

LATE, HARSH, OR NO SHIFT Pull codes and check speed sensors Check line pressure Ask TTe

ERRATIC SHIFT Pull codes and check wiring connections Monitor shift commandsand shift with a manual

shifter - such as a TRAN XLATE OR NO DOWNSHIFT ON COUNT DOWN Pull codes

Pull codes Send force motor, boost valve, and pressureregulator valve (valves are in pump , but are

accessible from pan)

AsTraTe

No Kickdown Check TPS and accelerator linkage travel

SLIPPING, CHATTERING, SHUDDERING Check fluid level and condition, pullcodes, check for sensor related failure

Internal prob

LEAKSLocate leak, check for cracks or tool

gouges on area of leak, repair as neededProne to driveline problem

causing case breakage or crackson right side from rear up to vent

NOISEMake sure it's in the trans

and not in the vehicle

Changes withengine speed

Changes withroad speed

Pump or inputarea failure

Make sure it's not the carrierbearing or the differential

ENGAGEMENTPROBLEMS

Pull codes

Soft ordelayed

Harsh

Unplug harness - if still soft ordelayed, has an internal problem,

Force motor (EPC) problem or pressure

regulator and boost valve problem (all partsaccessible by pulling pan)

Pressure regulator valve and boost valve are in the pump. Failsafe is 2nd gear and reverse.

HARSH DOWNSHIFTS

n:\common\pdq\flowtran\4L80E


7/26

700R4 - 4L60

Early or soft shift Check fluid leveland condition

Fluid okCheck TV pressure then

check governor Send

Valve body

Late, harsh or

no shift

Check fluid level

and condition

Fluid burnt

Neutrals out

Fluid ok Check TV pressure

then check governor

Possible pump

(internal)

problem

Send valve body

Unit failure

Erratic shift See if TV cable is stickingbinding or dragging

Governor maybe dragging

Valve bodyproblem

Possible pumpproblem (very rare)

Late or no downshift on coast down Governor dragging Valve body problem

Harsh downshifts TV pressure too high or cable sticking Valve body problem

No kickdown Make sure accelerator pedal is reaching wide open throttle TV pressure too low Valve body proble

Slipping, Chattering,Shuddering


Fluid ok

Fluid burnt

Check TV pressure

Unit failure

Leaks

From bellhousing

From governor cover

From vent tube

From servo cover

From pan

Front seal - check pump bushing, check converter for cracks

Possible valve body problem

Servo cover seal - check case for cracks or gouges

Reseal cover - check case, for cracks or gouges

Repair - check pan rail for warpage

Internal problem

From bellhousing


In all gears

Pump problem

Planetary failure

Gear train or bearing failure

Noise

Engagementproblems

Harsh

Soft

Delayed

Harsh, soft or delayed - fluid burnt Unit failure

In failsafe TV pressure too high Internal problem

Check manual valve adjustment TV pressure too low Internal problem

Check fluid level and condition If fluid is foaming, check filter to pump seal and housing Interprob

If unit was just installed and has alate shift, check pressure. If 110 -PSI, unit is in failsafe. Pull the cab

tight, start engine and adjust press

from high down to spec. 700's wila 4 - 2 kickdown under 60 MPH.

n:\common\pdq\flowtrans\700R4-4L60 4/2


8/26

A4LD

EARLY ORSOFT SHIFT


ERRATICSHIFT

HARSHDOWNSHIFTS

NO KICKDOWN

SLIPPING, CHATTERING, SHUDDERING

NOISE

ENGAGEMENT

PROBLEMS

Check fluidlevel and

condition

Check for binding throttle valve linkageand kinked vacuum line to modulator

Check cable adjustment

From bellhousing

Delayed

Harsh

Fluid burnt

Fluid ok

Internal failure

Check throttle valve linkageadjustment and monitor

vacuum signal at modulator

Send modulator,

valve body, andgovernor (install

in that order)

When cold on

the first shift

Check fluid level

and condition

Governor is sticking* #1 problem *

Check throttle valve linkage

adjustment and vacuum at modulator

Send modulator, governor, and

valve body (install in that order)

Send valve body and governor(install in that order)

LATE OR NO DOWNSHIFT ON COAST DOWN Send governor and valve body (install in that order)

Unplug main harness connector - see if vacuum at modulator rises on deceleration Send valve body

Send valve body

Check fluid level and condition

Check shift cableadjustment and pull pan Internal problem

LEAKS

From pan

From bellhousing

Between main case and bellhousing

Check pump bushing and converter

Retorque pan bolts

Replace unit

Check pan rail for warpage - check case and bolt holes for cracks

Prone to engine - transmission alignment problems it is almost always the fault of the engine

See if flex plate is broken - very common problem due to engine -

transmission alignment problems that are usually the fault of the engine

Possible pump problem

Check vacuum at modulator - should be 18 - 20 "

Check shift cable adjustment

Send modulator and valve body (install in that o

Internal problem

3 - 4 shift and lock-up are commanded by the computer - these two solenoids can set codes -

governor stuck or sticking is a very common problem.


9/26

AOD

EARLY OR

SOFT SHIFTCheck fluid level and condition TV pressure too low,

check and adjust

Valve body problem - replace valve body

Late, harsh,

or no shift

TV pressure too high -

check and adjust

Governor stuck or

dragging - clean governor

Valve body problem - replace valve body

ERRATICSHIFT

TV cable dragging or sticking -may need new cable

One gear affected -send valve body

All gears affected -

clean governor

1st shift late - rest of shi

stacked - clean governo

LATE OR NO DOWNSHIFTON COAST DOWN

Governor sticking - clean governor Shift valve in valve body sticking - send valve body

HARSH

DOWNSHIFTS TV cable dragging on deceleration - may need new cable Sticking valve in valve body - send valve body

NO KICKDOWN TV pressure too low - check and adjust Acceleration linkage not achieving wide open throttle -repair or replace parts as needed

SLIPPING,

CHATTERING,SHUDDERING

Check fluid

level andcondition

In 1st, 2nd, or reverse -

internal problem

In 3rd and/or 4th gear Check TV pressure

Ok

Low

Clutch or band failure -

internal problem

Clutch or band failure - po

caused by vehicle probleimproper installation

LEAKSOnly after sitting

Leaking frombellhousing

Only when running

Check front pan boltsThe same as with any

other leaks - check forgouges or cracks in

area of leak

NOISE

In bellhousing area

In all gears



Possible internal bearing failure

Planetary gear train problem

Engagement

problems Check fluid level

Harsh engagement

Delayed engagement

TV pressure too high - check and adjust

Incorrect manual valve adjustment -check and adjust

Boost valve

pressure regulvalve sticking

replace valve b

Internal probl

Front pump seal, o-ring or bolts

n:\common\pdq\flowtran\AOD 4/


10/26

AODE, AODEW, 4R70W

EARLY OR

SOFT SHIFT


ERRATIC

SHIFT

LATE OR NO

DOWNSHIFT ONCOAST DOWN

NO KICKDOWN

LEAKS

NOISE

ENGAGEMENTPROBLEMS

HARSH

DOWNSHIFTS

SLIPPING,CHATTERING,

SHUDDERING

Pull codes - check fluid level and condition Early shifts Monitor shift commands - most likely a vehicle pro

Check bulletins* Soft shift Most likely an internal problem

Pull codes - check fluid level and condition

Check bulletins*

Affects one gear

Affects all gears

Possible valve body problem

Monitor computer Possible internal problem

Pull codes - check fluid level and condition

Check bulletins*

Use a shift monitor and manual shifter (Tran X, etc.) to determineif trans or vehicle related. Trans problem would likely be valve

body related - vehicle problem could be wiring or VSS

Monitor computer signals - most like a valve body problem Possible internal trans problem

Pull codes - check fluid level

and condition - may be highpressure caused by failsafe

TPS adjustment or

high idle speed aretwo possibilities

Possible valve

body problem

Possible internal

trans problem

Check TPS and acceleration linkage range Possible valve body problemPossible internal trans proble

Pull codes - check fluid level and condition Has a slipping code but fluid is ok Check VSS

Check bulletins* Most likely an internal trans problemFluid burnt

From bellhousing

From pan

Other areas

Check pan rail for warpage

When running

Locate source of leak

Only after sitting Try sealer on front pan bolts

Front pump seal - check bushing and converter hub

Pump o-ring - check case for gouges

If slinging around bellhousing, check for cracked converter

Check bolt torque, check for cracks, check for tool gouges

In bellhousing area

In all gears



Drive line noise or internal bearing failure


Does it have the updated TR/MLPS Pull codes - check fluid level and condition Possible internal proble

*Several bulletins on shift or shudder

complaints requiring PCM being repro-grammed, also other unique problems.The 1-2 and 2-3 shift accumulators arethe case - not in the valve body . Pres

regulator is in the valve body

n:\common\pdq\flowtran\AODE


11/26

EARLY ORSOFT SHIFT

LATE, HARSH,

OR NO SHIFT

ERRATIC

SHIFT

LATE OR NODOWNSHIFT ON

COAST DOWN

NO KICKDOWN

LEAKS

NOISE

ENGAGEMENTPROBLEMS

AXOD

Check fluid level and

condition

Check TV pressure at port above top

cooler line and adjust as needed

Possible valve body problem - if unit

must be removed to access valvebody, do not replace valve body

Check fluid level and

condition

Check TV pressure at portabove top cooler line and

adjust as needed

Stripped governor gear- possible internal

problem,

Possible valve body pro- if unit must be removaccess valve body, do

replace valve body

TV cable may be sticking Possible valve body problem - if unit must be removed toaccess valve body, do not replace valve body

Possible governor problemPossible valve body problem - if unit must be removed to access

valve body, do not replace valve body

HARSH

DOWNSHIFTS

Check TV pressure - see if line pressure responds to

throttle signal or if it stays on too high

Possible valve body problem - if unit must be removed to

access valve body, do not replace valve body

TV pressure may be too lowPossible valve body problem - if unit must be removed to

access valve body, do not replace valve body

SLIPPING,


Check fluid level,

condition, andTV pressure

Fluid burnt

Fluid and TV okAdd two

quarts of fluid

Now ok

No help

Drive for 20 minutes and rec

unit - was not hot enough wfluid was checked. Fluid

temperature must be 150 -degrees to check proper

Internal problem

Side pan

Bottom pan

Channel plate (chain cover) or case

Bellhousing

Repair

Covered under 500 miles

Replace unit

Check stator support (it is soft material) and convertor bushing for seeping - if scored, replace unit

In all gears except 3rd Planetary failure

Changes with engine speed

Changed with road speed

Pump failure or chain and sprockets

Final drive failure

Check fluid level

Harsh

Soft

Check TV pressure

If TV pressure will not respond to adjustment - poss

valve body problem if unit must be removed to accevalve body, do not replace valve body

Make sure unit was 150 -180 degreeswhen fluid was checked

Internal problem

Temperature of this trans is very importa

when checking fluid level. If not fully wa

up, fluid will check ok, but will be approx

2 quarts low. Final check fluid level ofte

after at least 20 minutes of driving drive.

n:\common\pdq\flowtran\AXOD


12/26

C6

EARLY ORSOFT SHIFT


Check vacuum hose

to modulator forkinks, pinching, or

sucking shut andtrapping valve

Gas engine

Diesel engine Check VRVTurn

modulatorscrew in 2

turns

Replvalve

LATE, HARSH,

OR NO SHIFT

Turn kickdown

rod adjustingscrew out

1/8th" inch

Check

vacuumat

modulator

Gas

engine

Diesel

engineCheck VRV

Turn

modulatorscrew 2

turns

Cleangovernor

Rep

vabo

ERRATIC

SHIFT

Check fluid level

and condition

Make sure

kickdown rod orcable is not binding

Make sure the vacuum hose to

the modulator is not routed whereit could be kinked or pinched

Clean

governor

Repl

valve

LATE OR NO DOWNSH Clean governor Replace valve body

HARSHDOWNSHIFTS

Gas engine

Diesel engine Check VRV

Changemodulator

Replacevalve body

NO KICKDOWN Adjust kickdown rod or cable Throttle linkage not reaching wide open throttle Replace valve body

SLIPPING,


Check fluid level

and condition

CheckVRV on

diesels

Fluid ok

Fluid burnt

Check pan

Unit failure

If pan is clean, replacevalve body

LEAKS Locate source of leakCheck area for toolgouges or cracks

If in bellhousing area,check converter for crack Repair as needed

NOISE

Whining noise in bellhousing

Clunking noise

Noise in all gears except 3rd

Pump is failing

ENGAGEMENTPROBLEMS


Delayed

Harsh

Check shift

linkageadjustment

Check

vacuum atmodulator

Internal problem

Check line pressure and

see if it responds tochanges in vacuum

See if valve behind

modulator is stuck, orit modulator is bad

R

Very rare for this to be a trans problem, usually in the drive train

Planetary gear train is failing

Check vacuum rise on deceleration

n:\common\pdq\flowtran\C6 4/2


13/26

TRANSMISSION

CHATTERING

OR SHUDDERING

Electronic

AODE, 4R70W, AXODE,

4R44E, 4R55E, 5R55E,

E40D, 4R100, 4L60E,

4T60E, 4T80E, 4L80E,

A604, 41TE, A606, 42LE,

42RE, 46RE, 47RE

Modulator controlled

C3, C4, C5, C6, A4LD

180, 250, 350, 400, 47

Throttle cable controlled

AOD, AXOD, ATX, 200R4,

700R4, 440T4, TH125,

Chrysler non-electronic

Correct fluid?

Correct level?

Fluid condition?

Correct fluid?

Correct level?

Fluid condition?

Go to Advanced

Diagnosis Sheet after

determining condition

of symptoms by

performing the

following tests

Correct fluid?

Correct level?

Fluid condition?

Shudder in lockup - tap the

brake pedal - shudder

should go away

Shudder on a shift will

shudder when the shift occurs

but not on acceleration

Shudder after a shift will shift okmost of the time, but will shudder

under a load or on acceleration

On some vehicles, the

wrong fluid or simply wor

out fluid is the only proble

Usually on internal

problem such as a cu

lip seal, o-ring, seal, o

a checkball hanging

leaking, and in some

cases missing

Just another form o

slipping - can be an

internal problem or c

be caused by extern

influences

n:\common\pdq\flowtran\chatter 3


14/26

E40EARLY OR

SOFT SHIFT


ERRATICSHIFT

HARSH

DOWNSHIFTS

NO KICKDOWN

SLIPPING, CHATTERING, SHUDDERING

LEAKS

NOISE

ENGAGEMENT

PROBLEMS

Pull codes

Codes

No codes

See Code

Reference Chart

Check F.I.P.I.

on Diesels

Possible valve

body problem

Possible unit

failure

Pull codes Check speed sensor - check T.P.S. pr gas engine - check F.I.P.L. on diesels Ask Trans Te


Pull codes and checkconnections

Send E400 test box, solenoid pack,and complete valve body

Ask Trans Tech

LATE OR NO DOWNSHIFT ON COAST DOWN Pull codes Send solenoid pack and valve body Ask Trans Tech

Pull codes Send solenoid pack and valve body Ask Trans Tech

Pull codes Most likely an engine problem - T.P.S. ongas engines - F.I.P.I. on diesel engines

Possible valve body problem Ask Trans Te

Check fluid level and condition Pull codes Unit failure

From bellhousing

Extension housing seal and bushing area

Slinging around bellhousing

Running front of pump

Converter is most likely cracked

Pump seals, o-ring, or bolts

*On ambulances only* grounding problem causeselectrical arcing between yoke and bushing. Put ground

strap on extension housing and on the differential

From bellhousing


All gears all the time

Pump problem


Bearing or bushing failure

Delayed

Harsh

Is line pressure 55-65 in

forward and 74-100 in reverse

Yes

No

Remove engagement spring in valve body

Internal problem

Does it have the new M.L.P.S.? Check TPS or F.I.P.L . voltage - check idle speed Ask Trans Te

F.I.P.L.- Fuel Injection Pump Lever Sensor - the diesel version of a T.P.S.

n:\common\pdq\flowtran\E40D 4/2


15/26

TRANSMISSION

EARLY SHIFT

Electronic

AODE, 4R70W AXODE,

4R44E, 4R55E, 5R55E,

E40D, 4R100, 4L60E,

4T60E, 4T80E, 4L80E,

A604, 41TE, A606, 42LE,

42RE, 46RE, 47RE



700R4, 440T4, TH125,



C3, C4, C5, C6, A4LD,

180, 250, 350, 400, 475

Pullcodes

Cable

too loose

Vacuum hose pinched

collapsed, hooked to

wrong source. See if

vacuum drops when

throttle is opened

See Code

Reference

Chart

If just installed,possible wrong

governor *Wintertime*

Ice in

modulator lineSee

Advanced

Diagnosis

Sheet

If just

installed -

possible

wronggovernor

See

Advanced

Diagnosis

Sheet

See

Advanced

DiagnosisSheet

n:\common\pdq\flowtran\earlyshi 3/2


16/26

TRANSMISSION

ERRATIC SHIFT

Electronic

AODE, 4R70W, AXODE,

4R44E, 4R55E, 5R55E,

E40D, 4R100, 4L60E,

4T60E, 4T80E, 4L80E,

A604, 41TE, A606, 42LE,

42RE, 46RE, 47RE

Modulator controlle

C3, C4, C5, C6, A4LD

180, 250, 350, 400, 47



700R4, 440T4, TH125,


Pull codes

Codes No

codes

See

Code

Reference

Chart

Check

wiring

connections

Cable sticking

or dragging

Governor

sticking or

dragging

Valve body

See

Advanced

DiagnosisSheet

Make sure hose

to modulator is in

good shape

Check kickdown

cable or switch

Governor sticking

or dragging

See

Advanced

Diagnosis

Sheet

See

Advanced

Diagnosis

Sheet

Valve body

n:\common\pdq\flowtran\erratic 3/2


17/26

TRANSMISSION

HARSH SHIFT

Electronic

AODE, 4R70W, AXODE,

4R44E, 4R55E, 5R55E,

E40D, 4R100, 4L60E,

4T60E, 4T80E, 4L80E,

A604, 41TE, A606, 42LE,

42RE, 46RE, 47RE

Modulator controlle

C3, C4, C5, C6, A4LD

180, 250, 350, 400, 4



700R4, 440T4, TH125,


Pull codes

Codes No

codes

See

Code

Reference

Chart

See Advanced

Diagnosis Sheet

Is shift timing

late or normal

Late Normal

Check cable

adjustment

or TV

pressure

setting

See AdvancedDiagnosis Sheet

Is shift timing

late or normal

Late Norm

Check

kickdown

cable

Check

18"

vacuum

modula

See Advanced

Diagnosis Sheet

n:\common\pdq\flowtran\harsh 3/2


18/26

TRANSMISSION

HARSH

DOWNSHIFTS

Electronic

AODE, 4R70W, AXODE,

4R44E, 4R55E, 5R55E,

E40D, 4R100, 4L60E,

4T60E, 4T80E, 4L80E,

A604, 41TE, A606, 42LE,

42RE, 46RE, 47RE


C3, C4, C5, C6, A4LD

180, 250, 350, 400, 47



700R4, 440T4, TH125,


Are upshifts ok

Pull codes

See Code

Reference Chart

Are upshifts ok

See if cable is

sticking or

dragging

Go to

Advanced

Diagnosis

Sheet

Are upshifts ok

Make sure vacuum a

modulator increases o

deceleration

Go to

Advanced

Diagnosis

Sheet

Go to

Advanced

Diagnosis

Sheet

n:\common\pdq\flowtran\harshdow 3/20


19/26

TRANSMISSION

LATE OR

NO SHIFT

Electronic

AODE, 4R70W, AXODE,

4R44E, 4R55E, 5R55E,

E40D, 4R100, 4L60E,

4T60E, 4T80E, 4L80E,

A604, 41TE, A606, 42LE,

42RE, 46RE, 47RE


C3, C4, C5, C6, A4LD

180, 250, 350, 400, 47



700R4, 440T4, TH125,


Stuck in 1st gear

or in fail safe?

In failsafe Stuck in

1st gear

Check

speed

sensor

Pull codes

Codes No

codes

See

CodeReference

Chart

See

Advanced

Diagnosis

Sheet

Will it shift when you let

off of the accelerator

Yes No

Cable is

too tight

Stuck or

dragging

governor

Stuck or

dragging

governor

Valve body

(except 440-T4)

See

Advanced

Diagnosis

Sheet

Check kickdowncable or switch

Stuck or dragging

governor

Valve

body

See

Advanced

Diagnosis

Sheet

Check vacuum to

modulator - needs 18

n:\common\pdq\flowtran\lateiorno 3/


20/26

TRANSMISSION

LEAKS

LOCATION OF LEAKS

Pan

Covered by

warranty

under 500

miles

Cooler

lines or

fittings

Loose or

mis-matched

fittings or

cracked

case

Servo

cover or

extension

housing

to case

Not

commonbut can

usually be

field

repaired

Rear

seal

Use liquid teflon sealer

only - teflon tape on

fittings is a major

cause of cracked case

or cooler fittings

Warranty coverag

one-time only -

check housing fo

gouges and yoke f

burrs, etc.

Bellhousing

When

running

Not

running

Front

pump sealor pump

o-ring

and/or

pump bolts

On some

units, panbolts

provide

into the

bellhousing

area and

can be the

source of

small leaks

Tool gouges and

small cracks can also

be the source of leaks

n:\common\pdq\flowtran\leaks 3/2


21/26

TRANSMISSION

NO DOWNSHIFTSTUCK IN HIGHER GEAR

Electronic

AODE, 4R70W, AXODE,

4R44E, 4R55E, 5R55E,

E40D, 4R100, 4L60E,

4T60E, 4T80E, 4L80E,

A604, 41TE, A606, 42LE,

42RE, 46RE, 47RE

Modulator controlle

C3, C4, C5, C6, A4LD

180, 250, 350, 400, 47



700R4, 440T4, TH125,


Most likely in failsafe

so pull codes

Codes No

codes

See Code

Reference

Chart

Check

power to

trans andcomputer

See Advanced

Diagnosis Sheet

Will it upshift and

downshift manually

Yes NO

Clean or

replace

governor

Does it

bind up in

reverse

Yes NO

Clutch or

band

welded or

stuck

Valve body

See Advanced

Diagnosis Sheet

n:\common\pdq\flowtran\nodown 3/2


22/26

TRANSMISSION

NOISES

KNOCKING NOISE usually a cracked or broken flexplate - common on

A4LD's and TH350's.

WHINING NOISE FROM THE BELLHOUSING usually indicates a failing pump or

input area bearing.

WHINING NOISE IN REVERSE is usally normal due to power flow through the

gear train.

WHINING OR GRINDING NOISE IN ALL GEARS EXCEPT 3RD GEAR

is a sure sign of planetary component failure.

STRANGE AND UNUSUAL NOISES usually have strange and unusual causes -

see Advanced Diagnosis Sheet.

WHINING NOISE IN ALL GEARS can be a sign of bearing failure, especially

in the output shaft area.

n:\common\pdq\flowtran\noises 3/20


23/26

TRANSMISSION

NO KICKDOWN

Electronic

AODE, 4R70W, AXODE,

4R44E, 4R55E, 5R55E,

E40D, 4R100, 4L60E,

4T60E, 4T80E, 4L80E,

A604, 41TE, A606, 42LE,

42RE, 46RE, 47RE


C3, C4, C5, C6, A4LD,

180, 250, 350, 400, 475



700R4, 440T4, TH125,


Pull Codes

See Code

Reference

Chart

Check

TPS

OperatingRange

See

Advanced

Diagnosis

Sheet

Check

cable or TV

Pressure

adjustment

See

Advanced

Diagnosis

Sheet

Check detent

cable or

kickdown

switch

See

Advanced

Diagnosis

Sheet

n:\common\pdq\flowtran\nokick 3/2


24/26

TRANSMISSION

SLIPPING

Electronic

AODE, 4R70W, AXODE,

4R44E, 4R55E, 5R55E,

E40D, 4R100, 4L60E,

4T60E, 4T80E, 4L80E,

A604, 41TE, A606, 42LE,

42RE, 46RE, 47RE


C3, C4, C5, C6, A4LD

180, 250, 350, 400, 47



700R4, 440T4, TH125,


Pull codes

See

Code

Reference

Chart

Find out which gear(s)

and go to Advanced

Diagnosis Sheet

Some people confuse a late shift with slipping. Slipping should

be considered as an incorrect gear ratio after a shift, or the clutch

pack or band not allowing full power transfer.

n:\common\pdq\flowtran\slipping 3/2


25/26

TRANSMISSION

SOFT ORSOGGY SHIFT

Electronic

AODE, 4R70W, AXODE,

4R44E, 4R55E, 5R55E,

E40D, 4R100, 4L60E,

4T60E, 4T80E, 4L80E,

A604, 41TE, A606, 42LE,

42RE, 46RE, 47RE


C3, C4, C5, C6, A4LD

180, 250, 350, 400, 47



700R4, 440T4, TH125,


Fluid level and

condition and

pull codes

Codes No

codes

See

CodeReference

Chart

If fluid is

burnt,

check

Code

Reference

Chart forsensor

related

failure

See Advanced

Diagnosis Sheet

Fluid level

and condition

Fluid ok Fluid burnt

See

Advanced

Diagnosis

Sheet

See

Advanced

Diagnosis

Sheet. Unit

will most

likely needto be

replaced

Fluid level

and condition

Fluid ok Fluid bu

See

Advanced

Diagnosis

Sheet

See

Advanc

Diagno

Sheet.

will mo

likely n

to be

replac

n:\common\pdq\flowtran\softor 3/2


26/26

TRANSMISSION

VIBRATION

Make sure it's not ashuddering or

chattering problem

Conditions

Changes with

engine speed

Changes with

road speed

Most likely

a driveline

problem

Will it vibrate inneutral when you

rev the engine

Yes No

Possible

engine

mis-fire onmalfunction

under a load

or possible

mount

problem

Make sure trans

was ordered for

the correctengine size -

some externally

balanced engines

have weights on

the converter

On some

vehicles, it is

possible to

unbolt theconverter and run

the engine - this

is a very good

way to confirm

diagnosis

n:\common\pdq\flowtran\vibrastio 3/2

auto transmission troubleshoot

Documents