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Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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Old 01-11-2018
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Tranny blues

I have a 2001 ranger auto 4x4 with the 4.0 whwn I start the truck the overdrive light starts flashing and goes into limp mode. Any help would be greatly appreciated.
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Old 01-11-2018
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Flashing OD light means there are Transmission Codes in computers memory, they start with P07xx

Most OBDII coder reads can read them but not all.

"Limp mode" means harsher shifts but that is actually BETTER for the transmission, safer, because clutches and bands(brakes) are not moving slowly in and out so less wear, just "bang" engaged, lol
Burnt clutches and bands come from not fully engaging or disengaging, i.e. smoother shifts

Could be something as simple as speed sensor, does your speedometer work?
Or could need a rebuild.
All Flashing OD light tells you, or me, or anyone else is that there are trans codes and a problem in the transmission

I assume you have checked ATF levels and they are OK and fluid color is good not dark
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Old 01-11-2018
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I put a coder on it and was coming up shift solenoid and torque converter soleniod. Changed transmission,new filter and oil and still same thing happens

Last edited by Bigslick; 01-12-2018 at 09:51 AM.
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Old 01-12-2018
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Not sure I am following along here

You swapped transmissions and still had flashing OD light?
If so then that would most likely be wiring or computer problem.

In 2001 fuse #41(20amp) in engine fuse box powers(12v) transmission solenoids
Computer Grounds a solenoid to activate it
Computer can "see" the 12v when key is on passing thru each solenoid, on its ground wire, so would set a code if a solenoid wasn't passing that 12v, broken wire in solenoid or harness.

So what were exact code numbers, it is important?
And you need to look at ALL related code numbers to see the code numbers the computer did NOT use, to narrow down the reason the computer used that exact code

For example:
P0740 Torque Converter Clutch Circuit Malfunction
P0741 Torque Converter Clutch Circuit Performance or Stuck Off
P0742 Torque Converter Clutch Circuit Stuck On
P0743 Torque Converter Clutch Circuit Electrical
P0744 Torque Converter Clutch Circuit Intermittent

Computer picked one of these for a reason and didn't pick the other 4

Last edited by RonD; 01-12-2018 at 10:57 AM.
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Old 01-12-2018
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Quote:
Originally Posted by RonD View Post
Not sure I am following along here

You swapped transmissions and still had flashing OD light?
If so then that would be wiring or computer problem.

In 2001 fuse #41(20amp) in engine fuse box powers(12v) transmission solenoids
Computer Grounds a solenoid to activate it
Computer can "see" the 12v when key is on passing thru each solenoid, on its ground wire, so would set a code if a solenoid wasn't passing that 12v, broken wire in solenoid or harness.

So what were exact code numbers, it is important?
And you need to look at ALL related code numbers to see the code numbers the computer did NOT use, to narrow down the reason the computer used that exact code
I'll check again and get back to you. Thanks again
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Old 01-12-2018
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Quote:
Originally Posted by Bigslick View Post
I'll check again and get back to you. Thanks again
If the codes wasn't cleared would it cause the problem?
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Old 01-12-2018
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No, it shouldn't, codes are in memory, not an active function of computer operation
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Old 01-17-2018
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Originally Posted by RonD View Post
No, it shouldn't, codes are in memory, not an active function of computer operation
ok changed a relay and the fuse #41 was blown. Ran fine for about a day now keeps blowing fuse #41 soon as I start it
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