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Old 06-08-2021, 07:53 PM   #1
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Check engine light

Hi all. 1994 Winnebago Brave on the Ford F53 chassis with the 460 and E4OD transmission. It had a bad transmission. I replaced it with a remanufactured unit. The transmission seems to be in limp mode. The check engine light does not come on when turning the key to the run position and has not since I purchased the RV. Where do I begin to figure out why the check engine light doesnít illuminate? I worked in the automotive parts industry for 20 years but have limited experience with motor homes.
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Old 06-08-2021, 08:11 PM   #2
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Does the engine run OK?
If it does not start and run you need to check power and grounds to the PCM.
Have you check the MIL bulb?
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Old 06-09-2021, 02:15 PM   #3
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I also have a 94 Brave. It should be easy to check the MIL bulb, assuming that you've discovered that the instrument pod is hinged at the back (ie the edge away from the driver), so you can push the top edge of the pod away from you and up, and then you will have access to the back of the panel, and the bulb holders.


This OBD-1 system can also have codes that do not light the MIL, so you should check for codes whether or not you are getting a MIL.


What symptoms are you getting that lead you to suspect a transmission problem?
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Old 06-10-2021, 09:22 AM   #4
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The MIL light is not blown. There is also a ďCheck TransĒ light that also doesnít illuminate. The RV does run (extremely rough and I suspect the timing is too far out for the computer to adjust as PO replaced the distributor) and it does move. In order to start off in 1st, I have to pull the selector lever to 1, otherwise it seems to start in 2nd gear.
Does anyone know where the OBD1 connector is? Iíve read on OBD2 itís by the steering plum. Iíve also read itís under the doghouse but Iíve not found it there.
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Old 06-10-2021, 10:17 AM   #5
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The OBD1 connector is called the EEC Self-Test plug in the photo below.

/
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Old 06-10-2021, 09:23 PM   #6
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Quote:
Originally Posted by Fairlane6t9 View Post
The MIL light is not blown. There is also a ďCheck TransĒ light that also doesnít illuminate. The RV does run (extremely rough and I suspect the timing is too far out for the computer to adjust as PO replaced the distributor) and it does move.

My Brave doesn't have any light that says "Check Trans". The O/D OFF button on the shift lever has a yellow light that on some models is programmed to flash if there are transmission faults. However on the 94 F-53, these are all disabled.


On the timing, the computer, the PCM doesn't know what the engine timing is. It assumes that the distributor has been correctly set at 10degrees BTDC with the SPOUT plug removed, and makes all it's calculations based on that.
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