Oh, so that basically tells you the ECU is pooched.
HELP...1992 jf80 went swimming
- Thread starter Ten4GoodBuddy
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Or ignition fuse blown or fusible link blown.
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Not necessarily. Several things can cause the CEL not to illuminate. Basic lack of power to the ECU, a faulty AFM, fuse, etc.
The ECUs are pretty robust in general, and the fact that he has a short somewhere in the gauge circuit is not helping. Without the 10 amp gauge fuse, the CEL won't light to even tell you that the ECU is in a ready state.
The GAUGE fuse runs a LOT of stuff that has all been compromised by water. From the FSM:
AT fluid temp sensor
AT indicator switch
Back up light switch
Brake fluid level switch
CDL control relay
Check engine light
Combination meter
Cooling fan for radio
Cruise control ECU
Defogger switch
Part of the Engine ECU
4WD indicator switch
Fuel sender
Heater blower switch and relay
OD solenoid
Oil pressure sender
Parking brake switch
Rear heater
Back up light
Seat belt warning
Tcase control
Water temp sender
LS1FJ40
SILVER Star
Rule #1: ALWAYS check the fusible links first. ALWAYS. It is the easiest and most common cause for no CEL.
I thought Rule #1 for the FJ80 was listen to @jonheld and ignore the people who obviously haven't read the entire post. Not referring to you. Seriously though guys, he had a running motor on starter fluid....obviously he had spark so why all the dizzy talk? Sounds like a fueling issue.
Any updates after the swim lesson?
- Thread starter
- #68
Sorry about the lack of updates... so it turns out that the “fuel” I pulled out of the tank wasn’t fuel after all, but all water! What you see in the picture is what I got out after draining more out of it, you can clearly see the separation and how much water we had in the tank.
After draining out the water, she started right up!!! Funny how she didn’t want to run on water! So obviously the ECU was fine and didn’t need replaced.
Now we’ve moved on to the fluids. We changed the oil(chocolate milk) and have moved on to the transmission. We’ve flushed it probably 5 or 6 times and are still getting milky fluid out when we drain it, so we’ll do it a few more times until it clears up. We did put it in gear and pulled her forward up the driveway and she did fine, but won’t take her for a spin until all of the water is cleared out.
Once the transmission is done(and hopefully in working condition) we’ll do the transfer case and differentials and then go from there.
After draining out the water, she started right up!!! Funny how she didn’t want to run on water! So obviously the ECU was fine and didn’t need replaced.
Now we’ve moved on to the fluids. We changed the oil(chocolate milk) and have moved on to the transmission. We’ve flushed it probably 5 or 6 times and are still getting milky fluid out when we drain it, so we’ll do it a few more times until it clears up. We did put it in gear and pulled her forward up the driveway and she did fine, but won’t take her for a spin until all of the water is cleared out.
Once the transmission is done(and hopefully in working condition) we’ll do the transfer case and differentials and then go from there.
Glad to see you got her going again. I think someone mentioned the water in the gas tank on post #11 
Damn, and I think my boys (4, 6, 8) are a handful now 
.
Glad things are looking positive.
. Glad things are looking positive.
Do the fluid exchange method in the transmission. Take 5 gallons of fluid but less overall time.
- Thread starter
- #73
What do you mean by the fluid exchange method?
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Nothing to add other than I’ll be showing this thread to my 9yr old as a preventive measure for the safety of my own rig.
Happy it is running again, keep up the good work.
Happy it is running again, keep up the good work.
From the transmission cooler in front of the radiator, unhook one hose and install a long hose to run into a 5 gallons bucket. Mark the bucket for quart levels. I measured the height and divided by 20 to get quart dimension.
Buy 5 gallons of new transmission fluid.
Start engine and run until the transmission pump starts making noise.
Shut it off.
Pour in same amount of new fluid through dipstick tube.
Repeat until all 5 gallons have been flushed through.
Make sure the hose you pull will flush the cooler as well.
You cannot stick one hose in a fresh bucket and the other in an empty bucket. The transmission will only push out, it will not suck back in.
