Auto Transmission Troubleshoot

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

3L80, TH400, TH475, TH375 Fluid foaming Check fluid level and condition

EARLY OR SOFT SHIFT

ERRATIC SHIFT

Fluid ok

Monitor vacuum at modulator - check line pressure

Fluid burnt

Unit failure

Late - harsh or no shift, clean governor

LATE OR NO DOWNSHIFT ON COAST DOWN

HARSH DOWNSHIFTS

Clean governor

Monitor vacuum at modulator

NO KICKDOWN

Check fluid level and condition

SLIPPING, CHATTERING, SHUDDERING

Send valve body

Send valve body

Connect test light to wire at single-wire connector on the left side of the trans - turn ignition switch on - push accelerator all the way to the floor

In rare cases, could be modulator or modulator valve

Send valve body

Monitor vacuum to modulator and clean governor

In rare cases, may be an internal (pump) problem

Test light lights up

Send valve body

Test light doesn't light up

On diesels, check vacuum regulator valve

Vehicle problem - check transmission control fuse at fuse panel and check kickdown switch

Fluid burnt Fluid ok

Just running out

From bellhousing Cooler fittings to case LEAKS

Governor cover

Breather tube Pan

Check for cracked case

Fluid level over filled

Check bolt torque

Extension housing

Unit failure

Check line pressure and pull pan

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

Slinging around bellhousing

Check bolt torque

Replace governor

In rare cases could be internal (pump) problem

If harsh shift only, send valve body

Check vacuum at modulator - test drive with kickdown switch unplugged

LATE, HARSH, OR NO SHIFT

Check filter and intake pipe and o-rings

Check converter for cracks

Use sealer (liquid only) on fitting threads

Make sure cover is flat

Reseal

Overheating or restricted cooler

Internal problem

Check for warped or bent pan rail

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

CONTINUED NEXT PAGE

Warranty coverage on seal for one time only

n:\common\pdq\flowtran\3L80

5/2000

3L80, TH400, TH475, TH375 - cont. From bellhousing NOISE

In all gears except 3rd

Pump or converter failure

Planetary failure

In all gears - changes with road speed

Delayed

ENGAGEMENT PROBLEMS


Check driveline

Possible internal failure

Check manual valve adjustment Harsh

Check VRV on diesels

Check vacuum at modulator if ok, check line pressure

Soft or slipping on engagement Fluid burnt

Line pressure specs: Neutral @ 1000rpm / 55 - 70 psi Drive @ 1000 rpm / 60 - 90 psi Reverse @ 1000 rpm 95 - 150 psi

Most likely an internal failure Possible internal problem

Internal problem

Internal problem

If kickdown switch is activated, pressure will be 90 - 110 psi. The pressure regulator and boost valves are in the pump

n:\common\pdq\flowtran\3L80two

5/2000

4L60E Pull codes, check fluid level and condition

EARLY OR SOFT SHIFT

Fluid burnt


Pull codes, check fluid level and condition

ERRATIC SHIFT

Fluid ok

NO KICKDOWN

Pull codes, look for 3 - 2 solenoid code

LEAKS

Send valve body

Fluid burnt

Internal problem

Fluid ok

High pressure may be caused by a trouble code

Send valve body

Check TPS voltage range and make sure accelerator linkage has full travel

If vehicle was built between 8/95 and 2/14/96, see Bulletin 66-71-03 and repair accordingly

Internal problem

Send 3 - 2 solenoid


Ask Trans Tech

Pull pan to confirm if internal problem

Check front seal and pump bushing, check converter for cracks

From vent tube

Fluid level over-filled

Ask Trans Tech

Possible vehicle problem

Send valve body

From bellhousing

From servo cover

Internal problem

Solenoid codes , send all shift solenoids No solenoid codes - send valve body and Tran X

Pull codes, look for solenoid codes

No



Sweep TPS and check VSS signal

Check wiring connectors

Fluid ok


HARSH DOWNSHIFTS

Send valve body

Internal problem

Fluid burnt

Stuck in 3rd gear until vehicle is shut off?

If it sets a clip code, check VSS circuit before replacing unit

Sweep TPS and check VSS signal, check for updated PCM calibrations

Yes LATE OR NO DOWNSHIFT ON COAST DOWN

Internal problem

Internal Problem

Fluid burnt Pull codes, check fluid level and condition

See Bulletin #66-71-03 and repair accordingly

Built between 8/95 and 2/14/96

If 95 or 96, model, check build date

Ask Trans Tech

Internal problem

Servo cover seal, check case for cracks or gouges

From governor cover

Reseal cover, check case for cracks or gouges

From pan

Repair, check pan rail for warpage

CONTINUE NEXT PAGE

n:\common\pdq\flowtran\4L60E

4/2000

4L60E CONTINUED From bellhousing NOISE

In all gears except 3rd In all gears

Harsh

Pump problem

Planetary failure Make sure it's not a vehicle problem

Pull codes

Ask Trans Tech

May be caused by a trouble code

Ask Trans Tech

Soft Pull codes

ENGAGEMENT PROBLEMS

Check linkage adjustment

Ask Trans Tech

Delayed Harsh, soft, or delayed - fluid burnt

Unit failure

Pressure regulator valve and boost valve are in the pump.

n:\common\pdq\flowtran\4L60E2nd

4/200

4L80E EARLY OR SOFT SHIFT

Pull codes

LATE, HARSH, OR NO SHIFT ERRATIC SHIFT

Check line pressure

Pull codes and check speed sensors

Pull codes and check wiring connections

LATE OR NO DOWNSHIFT ON COUNT DOWN HARSH DOWNSHIFTS

No Kickdown

Pull codes

NOISE

ENGAGEMENT PROBLEMS

Check line pressure

Ask Trans Tech

Monitor shift commands and shift with a manual shifter - such as a TRAN X

Send force motor, boost valve, and pressure regulator valve (valves are in pump , but are accessible from pan)

Ask Trans Tech

Check TPS and accelerator linkage travel


LEAKS

Pull codes

Ask Trans Tech

Check fluid level and condition, pull codes, check for sensor related failure

Locate leak, check for cracks or tool gouges on area of leak, repair as needed

Internal problem

Prone to driveline problem causing case breakage or cracks on right side from rear up to vent

Changes with engine speed

Pump or input area failure

Changes with road speed

Make sure it's not the carrier bearing or the differential

Make sure it's in the trans and not in the vehicle

Soft or delayed

Unplug harness - if still soft or delayed, has an internal problem,

Pull codes Harsh

Force motor (EPC) problem or pressure regulator and boost valve problem (all parts accessible by pulling pan)

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

n:\common\pdq\flowtran\4L80E

4/2000

700R4 - 4L60 Early or soft shift

Check TV pressure then check governor

Fluid ok


Fluid burnt Late, harsh or no shift


Unit failure

See if TV cable is sticking binding or dragging

Late or no downshift on coast down

Harsh downshifts

Possible pump (internal) problem

Neutrals out Fluid ok

Erratic shift

Check TV pressure then check governor

Governor may be dragging

Fluid ok

Valve body problem

TV pressure too low

From bellhousing From vent tube

Check TV pressure

From servo cover

From pan

In all gears except 3rd In all gears

Soft

Front seal - check pump bushing, check converter for cracks Internal problem

Servo cover seal - check case for cracks or gouges Reseal cover - check case, for cracks or gouges Repair - check pan rail for warpage

From bellhousing

Harsh

Unit failure

Possible valve body problem

From governor cover

Noise

Valve body problem

Check fluid level and condition Fluid burnt

Leaks

Possible pump problem (very rare)

Valve body problem

Governor dragging

TV pressure too high or cable sticking

Slipping, Chattering, Shuddering

Send valve body

Valve body problem

Make sure accelerator pedal is reaching wide open throttle

No kickdown

Send Valve body

If unit was just installed and has a late shift, check pressure. If 110 - 120 PSI, unit is in failsafe. Pull the cable tight, start engine and adjust pressure from high down to spec. 700's will do a 4 - 2 kickdown under 60 MPH.

Pump problem

Planetary failure Gear train or bearing failure

In failsafe

TV pressure too high

Check manual valve adjustment

Internal problem

TV pressure too low

Internal problem

Engagement problems Delayed


Harsh, soft or delayed - fluid burnt

If fluid is foaming, check filter to pump seal and housing

Internal problem

Unit failure n:\common\pdq\flowtrans\700R4-4L60

4/2000

A4LD Fluid burnt

Internal failure


EARLY OR SOFT SHIFT

Send modulator, valve body, and governor (install in that order)

Check throttle valve linkage adjustment and monitor vacuum signal at modulator

Fluid ok

Governor is sticking * #1 problem *

When cold on the first shift LATE, HARSH, OR NO SHIFT

Check throttle valve linkage adjustment and vacuum at modulator


ERRATIC SHIFT

Check for binding throttle valve linkage and kinked vacuum line to modulator


HARSH DOWNSHIFTS

Send governor and valve body (install in that order)

Check cable adjustment


From bellhousing

Check shift cable adjustment and pull pan

Internal problem

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

Check pump bushing and converter

Between main case and bellhousing

Send valve body

Send valve body


Retorque pan bolts

From pan

NOISE

Send valve body and governor (install in that order)

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

NO KICKDOWN

LEAKS

Send modulator, governor, and valve body (install in that order)

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

Replace unit

See if flex plate is broken - very common problem due to engine transmission alignment problems that are usually the fault of the engine From bellhousing Possible pump problem

Delayed

Check vacuum at modulator - should be 18 - 20 "

Send modulator and valve body (install in that order)

ENGAGEMENT PROBLEMS Harsh

Check shift cable adjustment

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.

AOD EARLY OR SOFT SHIFT

TV pressure too low, check and adjust


Late, harsh, or no shift

TV pressure too high check and adjust

ERRATIC SHIFT

Governor stuck or dragging - clean governor


HARSH DOWNSHIFTS

All gears affected clean governor


Governor sticking - clean governor

TV pressure too low - check and adjust


Leaking from bellhousing

Clutch or band failure internal problem

Ok

Check TV pressure

Low

Check front pan bolts

Front pump seal, o-ring or bolts

In bellhousing area

Possible pump problem

In all gears

Possible internal bearing failure

Clutch or band failure - possibly caused by vehicle problem or improper installation

The same as with any other leaks - check for gouges or cracks in area of leak

Planetary gear train problem

Harsh engagement Engagement problems

Acceleration linkage not achieving wide open throttle repair or replace parts as needed

In 3rd and/or 4th gear

Only when running


Sticking valve in valve body - send valve body

In 1st, 2nd, or reverse internal problem

Only after sitting

1st shift late - rest of shifts stacked - clean governor

Shift valve in valve body sticking - send valve body

TV cable dragging on deceleration - may need new cable

NO KICKDOWN

NOISE

Valve body problem - replace valve body

TV cable dragging or sticking may need new cable One gear affected send valve body

LEAKS

Valve body problem - replace valve body

TV pressure too high - check and adjust

Boost valve or pressure regulator valve sticking replace valve body

Incorrect manual valve adjustment check and adjust

Internal problem

Check fluid level Delayed engagement

n:\common\pdq\flowtran\AOD

4/2000

AODE, AODEW, 4R70W Early shifts

Pull codes - check fluid level and condition EARLY OR SOFT SHIFT

Check bulletins*

Soft shift

Most likely an internal problem

Affects one gear

Pull codes - check fluid level and condition LATE, HARSH, OR NO SHIFT

Check bulletins*


Monitor computer

Affects all gears

Possible internal problem

Use a shift monitor and manual shifter (Tran X, etc.) to determine if trans or vehicle related. Trans problem would likely be valve body related - vehicle problem could be wiring or VSS

Pull codes - check fluid level and condition ERRATIC SHIFT

Monitor shift commands - most likely a vehicle problem

Check bulletins*


HARSH DOWNSHIFTS

NO KICKDOWN

Monitor computer signals - most like a valve body problem

Pull codes - check fluid level and condition - may be high pressure caused by failsafe

TPS adjustment or high idle speed are two possibilities

Check TPS and acceleration linkage range

Possible internal trans problem


Possible internal trans problem

Possible valve body problem Possible internal trans problem

Has a slipping code but fluid is ok

Pull codes - check fluid level and condition SLIPPING, CHATTERING, SHUDDERING

Check bulletins*

Fluid burnt

Most likely an internal trans problem

Only after sitting From bellhousing From pan

LEAKS

Other areas

Check VSS

Try sealer on front pan bolts

When running

Front pump seal - check bushing and converter hub

Check pan rail for warpage Locate source of leak

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

NOISE

Possible pump problem

In all gears

Drive line noise or internal bearing failure



ENGAGEMENT PROBLEMS

Does it have the updated TR/MLPS

*Several bulletins on shift or shudder complaints requiring PCM being reprogrammed, also other unique problems. The 1-2 and 2-3 shift accumulators are in the case - not in the valve body . Pressure regulator is in the valve body

Pull codes - check fluid level and condition

Possible internal problem n:\common\pdq\flowtran\AODE

4/2000

AXOD Check fluid level and condition

EARLY OR SOFT SHIFT


Check TV pressure at port above top cooler line and adjust as needed

Check TV pressure at port above top cooler line and adjust as needed


ERRATIC SHIFT

HARSH DOWNSHIFTS

Possible valve body problem - if unit must be removed to access valve body, do not replace valve body


TV pressure may be too low

Fluid burnt SLIPPING, CHATTERING, SHUDDERING

Check fluid level, condition, and TV pressure



Possible governor problem

Check TV pressure - see if line pressure responds to throttle signal or if it stays on too high

NO KICKDOWN

Stripped governor gear - possible internal problem,


TV cable may be sticking



Now ok

Fluid and TV ok

Add two quarts of fluid

No help

Drive for 20 minutes and recheck unit - was not hot enough when fluid was checked. Fluid temperature must be 150 -180 degrees to check properly

Internal problem Side pan

Bottom pan

Repair Covered under 500 miles

LEAKS Channel plate (chain cover) or case Bellhousing

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

In all gears except 3rd NOISE

Planetary failure

Changes with engine speed

Pump failure or chain and sprockets

Changed with road speed

Final drive failure

Harsh ENGAGEMENT PROBLEMS

Replace unit

Check TV pressure

Temperature of this trans is very important when checking fluid level. If not fully warmed up, fluid will check ok, but will be approx. 2 quarts low. Final check fluid level often after at least 20 minutes of driving drive.

If TV pressure will not respond to adjustment - possible valve body problem if unit must be removed to access valve body, do not replace valve body

Check fluid level Soft

Make sure unit was 150 -180 degrees when fluid was checked

Internal problem

n:\common\pdq\flowtran\AXOD

4/2000

C6 EARLY OR SOFT SHIFT

Check vacuum hose to modulator for kinks, pinching, or sucking shut and trapping valve


Turn kickdown rod adjusting screw out 1/8th" inch


ERRATIC SHIFT

LATE OR NO DOWNSH

Diesel engine

Make sure kickdown rod or cable is not binding

Clean governor

Diesel engine

Check VRV

Turn modulator screw 2 turns

Make sure the vacuum hose to the modulator is not routed where it could be kinked or pinched

Clean governor

Clean governor

Replace valve body

Replace valve body

Replace valve body

Replace valve body Change modulator

Check vacuum rise on deceleration

Gas engine

Turn modulator screw in 2 turns

Check VRV

Gas engine

Check vacuum at modulator


Gas engine

Replace valve body

HARSH DOWNSHIFTS Diesel engine

NO KICKDOWN


LEAKS

Check VRV

Adjust kickdown rod or cable


Fluid burnt

Unit failure

If in bellhousing area, check converter for crack

Replace valve body

If pan is clean, replace valve body

Repair as needed

Pump is failing

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

Noise in all gears except 3rd

Planetary gear train is failing

Delayed ENGAGEMENT PROBLEMS

Check pan

Check area for tool gouges or cracks

Locate source of leak

Clunking noise

Fluid ok Check VRV on diesels

Whining noise in bellhousing NOISE

Throttle linkage not reaching wide open throttle

Check shift linkage adjustment

Internal problem

Check fluid level and condition Harsh

Check vacuum at modulator

Check line pressure and see if it responds to changes in vacuum

See if valve behind modulator is stuck, or it modulator is bad

n:\common\pdq\flowtran\C6

Replace valve body

4/2000

TRANSMISSION

CHATTERING OR SHUDDERING Electronic AODE, 4R70W, AXODE, 4R44E, 4R55E, 5R55E, E40D, 4R100, 4L60E, 4T60E, 4T80E, 4L80E, A604, 41TE, A606, 42LE, 42RE, 46RE, 47RE

Correct fluid? Correct level? Fluid condition?

Throttle cable controlled AOD, AXOD, ATX, 200R4, 700R4, 440T4, TH125, Chrysler non-electronic


Modulator controlled C3, C4, C5, C6, A4LD, 180, 250, 350, 400, 475


Go to Advanced Diagnosis Sheet after determining condition of symptoms by performing the following tests

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 ok most of the time, but will shudder under a load or on acceleration

On some vehicles, the wrong fluid or simply worn out fluid is the only problem

Usually on internal problem such as a cut lip seal, o-ring, seal, or a checkball hanging, leaking, and in some cases missing

Just another form of slipping - can be an internal problem or can be caused by external influences n:\common\pdq\flowtran\chatter

3/2000

Codes EARLY OR SOFT SHIFT

E40D

See Code Reference Chart

Pull codes No codes


ERRATIC SHIFT

Pull codes

Pull codes and check connections


Pull codes

NO KICKDOWN


Possible unit failure

Check speed sensor - check T.P.S. pr gas engine - check F.I.P.L. on diesels


HARSH DOWNSHIFTS

Check F.I.P.I. on Diesels

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

Pull codes

Send solenoid pack and valve body

Send solenoid pack and valve body

Pull codes


Slinging around bellhousing

Ask Trans Tech

Ask Trans Tech

Ask Trans Tech


Most likely an engine problem - T.P.S. on gas engines - F.I.P.I. on diesel engines


Ask Trans Tech

Pull codes

Ask Trans Tech

Unit failure

Converter is most likely cracked

From bellhousing Running front of pump

Pump seals, o-ring, or bolts

LEAKS Extension housing seal and bushing area

From bellhousing NOISE

*On ambulances only* grounding problem causes electrical arcing between yoke and bushing. Put ground strap on extension housing and on the differential

Pump problem



All gears all the time

Bearing or bushing failure

Yes Delayed ENGAGEMENT PROBLEMS

No Harsh

Remove engagement spring in valve body

Is line pressure 55-65 in forward and 74-100 in reverse

Does it have the new M.L.P.S.?

Internal problem

Check TPS or F.I.P.L . voltage - check idle speed

Ask Trans Tech

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

n:\common\pdq\flowtran\E40D

4/2000

TRANSMISSION

EARLY SHIFT Electronic AODE, 4R70W AXODE, 4R44E, 4R55E, 5R55E, E40D, 4R100, 4L60E, 4T60E, 4T80E, 4L80E, A604, 41TE, A606, 42LE, 42RE, 46RE, 47RE

Pull codes See Code Reference Chart

See Advanced Diagnosis Sheet



Cable too loose

Vacuum hose pinched, collapsed, hooked to wrong source. See if vacuum drops when throttle is opened

If just installed, possible wrong governor


*Wintertime* Ice in modulator line

If just installed possible wrong governor


n:\common\pdq\flowtran\earlyshi

3/2000

TRANSMISSION

ERRATIC SHIFT Electronic AODE, 4R70W, AXODE, 4R44E, 4R55E, 5R55E, E40D, 4R100, 4L60E, 4T60E, 4T80E, 4L80E, A604, 41TE, A606, 42LE, 42RE, 46RE, 47RE

Pull codes

Codes


No codes


Cable sticking or dragging Governor sticking or dragging

Valve body Check wiring connections




Make sure hose to modulator is in good shape

Check kickdown cable or switch Governor sticking or dragging Valve body


n:\common\pdq\flowtran\erratic

3/2000

TRANSMISSION

HARSH SHIFT Electronic AODE, 4R70W, AXODE, 4R44E, 4R55E, 5R55E, E40D, 4R100, 4L60E, 4T60E, 4T80E, 4L80E, A604, 41TE, A606, 42LE, 42RE, 46RE, 47RE

Pull codes

Codes

No codes



Is shift timing late or normal


Is shift timing late or normal Late

Late

Normal

Normal

Check cable adjustment or TV pressure setting

Check kickdown cable

Check for 18" vacuum at modulator

See Advanced Diagnosis Sheet See Advanced Diagnosis Sheet


n:\common\pdq\flowtran\harsh

3/2000

TRANSMISSION

HARSH DOWNSHIFTS Electronic AODE, 4R70W, AXODE, 4R44E, 4R55E, 5R55E, E40D, 4R100, 4L60E, 4T60E, 4T80E, 4L80E, A604, 41TE, A606, 42LE, 42RE, 46RE, 47RE Are upshifts ok

Pull codes




Are upshifts ok Are upshifts ok

See if cable is sticking or dragging

Go to Advanced Diagnosis Sheet

Make sure vacuum at modulator increases on deceleration



n:\common\pdq\flowtran\harshdow

3/2000

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

Stuck in 1st gear or in fail safe? In failsafe

Stuck in 1st gear

Check speed sensor

Pull codes

Codes

No codes



Will it shift when you let off of the accelerator Yes

Cable is too tight

No

Stuck or dragging governor

Stuck or dragging governor

Valve body (except 440-T4)


Check vacuum to modulator - needs 18" Check kickdown cable or switch Stuck or dragging governor Valve body See Advanced Diagnosis Sheet


See Advanced Diagnosis Sheet n:\common\pdq\flowtran\lateiorno

3/2000

TRANSMISSION

LEAKS LOCATION OF LEAKS Bellhousing

When running Front pump seal or pump o-ring and/or pump bolts

Not running On some units, pan bolts 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

Pan

Covered by warranty under 500 miles

Cooler lines or fittings

Servo cover or extension housing to case

Not common but can usually be field repaired

Rear seal Warranty coverage one-time only check housing for gouges and yoke for burrs, etc.

Loose or mis-matched fittings or cracked case

Use liquid teflon sealer only - teflon tape on fittings is a major cause of cracked case or cooler fittings

n:\common\pdq\flowtran\leaks

3/2000

TRANSMISSION

NO DOWNSHIFT STUCK IN HIGHER GEAR Electronic AODE, 4R70W, AXODE, 4R44E, 4R55E, 5R55E, E40D, 4R100, 4L60E, 4T60E, 4T80E, 4L80E, A604, 41TE, A606, 42LE, 42RE, 46RE, 47RE

Most likely in failsafe so pull codes Codes


No codes Check power to trans and computer




Will it upshift and downshift manually Yes

Clean or replace governor

NO

Does it bind up in reverse

Yes

Clutch or band welded or stuck

NO

Valve body


n:\common\pdq\flowtran\nodown

3/2000

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. WHINING NOISE IN ALL GEARS can be a sign of bearing failure, especially in the output shaft area. STRANGE AND UNUSUAL NOISES usually have strange and unusual causes see Advanced Diagnosis Sheet.

n:\common\pdq\flowtran\noises

3/2000

TRANSMISSION

NO KICKDOWN Electronic AODE, 4R70W, AXODE, 4R44E, 4R55E, 5R55E, E40D, 4R100, 4L60E, 4T60E, 4T80E, 4L80E, A604, 41TE, A606, 42LE, 42RE, 46RE, 47RE

Pull Codes



Check cable or TV Pressure adjustment



Check detent cable or kickdown switch


Check TPS Operating Range


n:\common\pdq\flowtran\nokick

3/2000

TRANSMISSION

SLIPPING Electronic AODE, 4R70W, AXODE, 4R44E, 4R55E, 5R55E, E40D, 4R100, 4L60E, 4T60E, 4T80E, 4L80E, A604, 41TE, A606, 42LE, 42RE, 46RE, 47RE



Pull codes


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

3/2000

TRANSMISSION

SOFT OR SOGGY SHIFT Electronic AODE, 4R70W, AXODE, 4R44E, 4R55E, 5R55E, E40D, 4R100, 4L60E, 4T60E, 4T80E, 4L80E, A604, 41TE, A606, 42LE, 42RE, 46RE, 47RE

Fluid level and condition and pull codes

Codes

No codes



Fluid level and condition Fluid ok



Fluid level and condition Fluid ok

Fluid burnt


See Advanced Diagnosis Sheet. Unit will most likely need to be replaced

Fluid burnt

See Advanced Diagnosis Sheet. Unit will most likely need to be replaced

If fluid is burnt, check Code Reference Chart for sensor related failure


n:\common\pdq\flowtran\softor

3/2000

TRANSMISSION

VIBRATION Make sure it's not a shuddering or chattering problem

Conditions Changes with engine speed

Changes with road speed

Will it vibrate in neutral when you rev the engine

Most likely a driveline problem

Yes

Make sure trans was ordered for the correct engine size some externally balanced engines have weights on the converter

No

Possible engine mis-fire on malfunction under a load or possible mount problem

On some vehicles, it is possible to unbolt the converter and run the engine - this is a very good way to confirm diagnosis

n:\common\pdq\flowtran\vibrastio

3/2000

Auto Transmission Troubleshoot

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