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Old 02-23-2015, 01:56 PM
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Exclamation transmission problem - no codes, any advice greatly appreciated!

The fluid is clear and full. No engine codes! 1st it would not shift onto 3rd. Adjusted the shift cable on the throttle body and it helped a lot but ocassionaly would not hit 3rd gear, if I let off the gas it seems ok. Today, it like miss shifted, the RPMS went to 0 and I thought that was it! Pulled over checked fluid and cable all ok. Drove 10 miles and it did it again. I know that could be a lot if things, but there are no codes. I'm going to drop the pan look for parts and signs of the problem and replace filter and fluid. Has anyone seen that problem before? ANY suggestions are appreciated!

1999 Jeep Grand Cherokee Laredo 4.0

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Old 02-23-2015, 03:15 PM
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Re: transmission problem - no codes, any advice greatly appreciated!

Welcome to the garage.
I wonder if the problem is the transmission, or the engine. That the rpmīs went to 0, looks more as an engine stall. Was the crank sensor replaced recently?
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Old 02-23-2015, 07:25 PM
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Re: transmission problem - no codes, any advice greatly appreciated!

Quote:
Originally Posted by Frango100 View Post
Welcome to the garage.
I wonder if the problem is the transmission, or the engine. That the rpmīs went to 0, looks more as an engine stall. Was the crank sensor replaced recently?

No engine work at all, it's been solid. I just assumed this was the tranny. It's been acting up. At first the only problem was that late shift which I had 90% fixed by adjusting the shift cable.

The new problem happen twice, the 1st time driving normal. The second time I hit the has hard to kick in OD. It did kick in but then it was like it then engine/tranny disengaged. The motor stayed running, but the tach dropped to 0 for a few seconds and then went back to normal. When that happen it was coast mode until things reenguaged. Weird .

Would a crank sensor cause that? What's killing me is no engine codes!

Thanks for your help, I really appreciate it.
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Old 02-24-2015, 06:29 AM
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Re: transmission problem - no codes, any advice greatly appreciated!

A bad crank sensor will cause the engine to stall and the rpm indication to drop to 0, eventhough the engine can still be rotating. But there are also cases known with the 4.0 of shaved wiring, which caused a short and an engine stall. There runs a wire bundle around the cylinder head and it can be rubbing on a bolt head, eventually rubbing through the isolation and causing a short. My advise would be to first check the wire bundle. You said that the problem occured during acceleration. The engine will move due torsional loads when accelerating (and logical it moves more when accelerating harder), so it can be that the short only happens when the engine is under a certain load and moved a bit due to that load.
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Old 02-24-2015, 07:30 AM
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Re: transmission problem - no codes, any advice greatly appreciated!

Quote:
Originally Posted by Frango100 View Post
A bad crank sensor will cause the engine to stall and the rpm indication to drop to 0, eventhough the engine can still be rotating. But there are also cases known with the 4.0 of shaved wiring, which caused a short and an engine stall. There runs a wire bundle around the cylinder head and it can be rubbing on a bolt head, eventually rubbing through the isolation and causing a short. My advise would be to first check the wire bundle. You said that the problem occured during acceleration. The engine will move due torsional loads when accelerating (and logical it moves more when accelerating harder), so it can be that the short only happens when the engine is under a certain load and moved a bit due to that load.
Well I took it out this morning and same problem but with engine codes!

p1594 Battery voltage sense input above target charging voltage during engine operation.

AND as was mentioned earlier
p0320 No Crank Reference Signal at PCM.

I'm thinking the 1594 was caused by the 0320? I will check to wire bundle too.

Thanks again for your help.
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Old 02-24-2015, 11:20 AM
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Re: transmission problem - no codes, any advice greatly appreciated!

If the check of the wire bundle doesnīt reveil anything special, i would change the crank sensor. Jeepme did a nice writeup with pictures on it. How To: Replace Crankshaft Position Sensor
For the P1594 code i would measure the battery voltage with engine operating. If its between 13.5 and 14.5 V, its ok and i would errase the code and see if it comes back.
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Old 02-24-2015, 11:02 PM
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Re: transmission problem - no codes, any advice greatly appreciated!

Quote:
Originally Posted by Frango100 View Post
If the check of the wire bundle doesnīt reveil anything special, i would change the crank sensor. Jeepme did a nice writeup with pictures on it. How To: Replace Crankshaft Position Sensor
For the P1594 code i would measure the battery voltage with engine operating. If its between 13.5 and 14.5 V, its ok and i would errase the code and see if it comes back.

I took a quick look at rhe wire bundle and didn't notice anything. So I replaced the CPS, thought I had it but after a few minutes it started again, only the p0320 code now.

I'm going to really look at that wiring bundle tomorrow. If it is the bundle, do you repair just the bad wires? If not the wiring bundle what else could cause this problem & flip that code?

Thanks again for all of the help.
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Old 02-24-2015, 11:44 PM
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Re: transmission problem - no codes, any advice greatly appreciated!

If a wire is shaved, i would just put isolation tape on it. It can be that there is an internal wire break somewhere in the bundle. You will have to measure the wire resistance and mess a bit with the bundle to see if there is any problem.
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Old 02-28-2015, 01:02 PM
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Re: transmission problem - no codes, any advice greatly appreciated!

Did you check the kick-down lever on the transmission, my was seized up from sitting for a month, trams wasn't shifting properly. I free up the kick-down lever on trans, shifts ok now.


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