need help with o/d flashing light

[nhawks]

I have a 97 explorer the o/d light flashes very randomly, sometimes it will be flashing immediately once you start it sometimes it will after driving it for a few minutes and sometimes it shuts off after being on while driving. When its on it makes it shift harder, it use to slip in od when it was on but its recently stopped. When the lights off the truck drives normal.I did the transmission fluid recently it didn't affect the o/d light but I did notice whoever did the previous filter didn't put the o rings on the inlet/ outlets of the filter. I have a code reader but it doesn't read transmission codes if I clear the ecu on my code reader while driving with the light on it will go away but come back after 30secs or so. Any help is appreciated

 

[drdoom]

Get the codes read ...you may be looking at torque converter clutch problems.

 

[01STrunner]

Or shift solenoids in the transmission. My flashed off and on for around a year and then I developed a 2-3 shift flare which finally caused me to fix the problem.

 

[nhawks]

Tonight I was ofroading going through some mud and sand, was mainly in 1st or second gear in higher ROMs. Was acting pretty normal but after I got out onto the pavement and got going 30 35 I was probably in 3rd or 4th gear and if a gave it gas it would start slipping and Rpms would be 3-4k ish. So I put it in 2 which didn't slip at all. Then I put it into drive and now it will only shift once you accelerate to around 4k but its not slipping or at least not as much as before. Now does this seem more like solenoids or valve body gasket a or something else

 

[J_Train]

Shift Concerns: Feel — Harsh (Some/All) Possible Component Reference/Action
214 — ELECTRICAL ROUTINE
Powertrain Control System
Electrical inputs/outputs, vehicle wiring harness, internal transmission wiring harness, PCM, EPC, TFT, RPM, DTR, OSS, TP*, MAF*

Run on-board diagnostics. Refer to Powertrain Control/Emissions Diagnosis Manual. Use NGS to perform the following Pinpoint Tests: B, D, E. Repair as required. Clear codes, road test and rerun on-board diagnostics.

* Also see Routine 265

314 — HYDRAULIC/MECHANICAL ROUTINE
Fluid
Improper level
Adjust to proper level.

Improper Pressures
Improper band/clutch application pressures, line pressure high
Check line pressure at tap. Perform line pressure and stall speed tests. Refer to pressure chart No. 401 for specifications. If pressure is high check the following possible components: main control.

Main Control Assembly
Screw out of torque specification
Tighten to specification.

Gasket damaged, off location
Inspect and replace gasket.

Separator plate damaged
Inspect for damage. Repair as required.

EPC, solenoid stuck, damaged, O-ring damaged or out of bore
Inspect for damage. Perform solenoid function test as listed in electrical routine. Repair as required.

Forward modulator valve/EPC boost valve (207), pressure boost valve/main regulator valve (208), spring, damaged, missing, misassembled, stuck, bore damaged
Inspect for damage. If damaged, replace main control. If parts are missing, replace missing parts or main control. If misassembled, reassemble properly. Do not stone, file or sand valves. This will remove the anodized finish and may result in further main control or transmission damage.

Wrong component used in rebuild
Verify that proper components were used.

Front Band
Misadjusted (tight)
Readjust to specification.

Intermediate Band
Misadjusted (tight)
Readjust to specification.

For diagnosis related to a specific shift, refer to Reference/Action. For diagnosis of a specific harsh shift, refer to the appropriate shift routine.

Harsh Shift 1-2, Routine 232/332
Harsh Shift 2-3, Routine 233/333
Harsh Shift 3-4, Routine 234/334
Harsh Shift 4-5, Routine 274/374
Harsh Shift 4-3, Routine 235/335
Harsh Shift 3-2, Routine 236/336

 

[J_Train]

Shift Concerns: Feel — Soft/Slipping (Some/All) Possible Component Reference/Action
213 — ELECTRICAL ROUTINE
Powertrain Control System
Electrical inputs/outputs, vehicle wiring harnesses, internal transmission wiring harness, PCM, TP, RPM, EPC, TFT, MAF
Engine — restricted air inlet
Perform shift point test. Run on-board diagnostics. Refer to Powertrain Control/Emissions Diagnosis Manual. Use NGS to perform the following Pinpoint Tests: B, E. Repair as required. Clear codes, road test and rerun on-board diagnostics.

313 — HYDRAULIC/MECHANICAL ROUTINE
Fluid
Improper level
Adjust to proper level.

Fluid contaminated
Inspect fluid for contamination. If contaminated, locate source of contamination. If burnt, inspect mechanical band, clutches. Repair as required.

Improper Pressures
Improper band/clutch application pressures, line pressure low
Check line pressure at tap. Perform line pressure and stall speed tests. Refer to pressure chart No. 401 for specifications. If pressure is low check the following possible components: main control, filter/seal, pump assembly.

Filter and Seal Assembly
Filter damaged, plugged; seal damaged, cut or missing
Inspect for damage and replace.

Main Control Assembly
Screw out of torque specification
Tighten to specification.

Gasket damaged, off location
Inspect and replace gasket.

Separator plate damaged
Inspect for damage. Repair as required.

EPC, solenoid stuck, damaged, O-ring damaged or out of bore
Inspect for damage. Perform solenoid function test as listed in electrical routine. Repair as required.

Pressure boost valve/main regulator valve (208), EPC blow-off valve, extension housing lube orifice, check ball C missing, valve spring, damaged, missing, misassembled, stuck, bore damaged
Inspect for damage. If damaged, replace main control. If parts are missing, replace missing parts or main control. If misassembled, reassemble properly. Do not stone, file or sand valves. This will remove the anodized finish and may result in further main control or transmission damage.

Wrong component used in rebuild
Verify that proper components were used.

Pump Assembly
Screws out of torque specification
Tighten screws to specification.

Front Band
Not adjusted properly
Readjust to proper specification.

Servo, piston and seals damaged
Inspect for damage. Repair as required.

Intermediate Band
Not adjusted properly
Readjust to proper specification.

Servo, piston and seals damaged
Inspect for damage. Repair as required.

For diagnosis related to a specific shift see Reference/Action. To diagnose a specific shift concern, refer to the appropriate shift routine.

Soft/Slipping Shift 1-2, Routine 226/326
Soft/Slipping Shift 2-3, Routine 227/327
Soft/Slipping Shift 3-4, Routine 228/328
Soft/Slipping Shift 4-5, Routine 272/372
Soft/Slipping Shift 5-4, Routine 273/373
Soft/Slipping Shift 4-3, Routine 229/329

 

[J_Train]

Also when the O/D light flashes if you dont have a scanner count the flashes. there will be so many flashes then a pause then more flashes then post the number when it happens again I'll tell you what the code is. thats what the flashing is, a DTC

 

[01STrunner]

Tonight I was ofroading going through some mud and sand, was mainly in 1st or second gear in higher ROMs. Was acting pretty normal but after I got out onto the pavement and got going 30 35 I was probably in 3rd or 4th gear and if a gave it gas it would start slipping and Rpms would be 3-4k ish. So I put it in 2 which didn't slip at all. Then I put it into drive and now it will only shift once you accelerate to around 4k but its not slipping or at least not as much as before. Now does this seem more like solenoids or valve body gasket a or something else

Mine did that. You really had to mash on it or it wouldn't shift up. My code was solenoids. Best thing to do would be hook up a reader and see what comes up.

 

[01STrunner]

Also when the O/D light flashes if you dont have a scanner count the flashes. there will be so many flashes then a pause then more flashes then post the number when it happens again I'll tell you what the code is. thats what the flashing is, a DTC

Very interesting. Amazing what they can build into cars

 

[nhawks]

I have a p1762 code cleared ecu and it shifted better but still hard into 3 and 4

 

[J_Train]

That is a trans code for sure. I believe for a band slippage. I'll look it up in a few on PTS.

 

[nhawks]

thanks for the help i just bought a rebuilt valve body after figuring out it would only cost $40 more then all the solenoids. i figured id need a shift solenoid and epv solenoid, but if i was going in there i was just going to do them all so i dont put $50 worth of transmission fluid in only to drain it out to replace another part soon after. but heres a site i found that helped me out, http://www.sonnax.com/system/pdfs/110/original/TS6-BW-106-109.pdf

 

[J_Train]

Well that didn't take long there's a TSB pertaining to that code give a few more moments so i can post it on here.

 

[J_Train]

https://docs.google.com/file/d/0B-v8dwcw3zecVjdrUGFUdW5DY00/edit

 

[nhawks]

alright so i replaced the valve body with a rebuilt one, it drives normal until i hit 65 in o/d then the 0o/d light starts flashing. its a steady flashing doesnt bring a code. it does the shift flare 2-3 and hard downshifts, but only after hitting 65. i can drive all day under 65 no problems minute i get up in that range it brings up that light. now im stumped