I have a 94 jeep cheroke SE with the 4.0 and aw4 transmission. Last week the jeep started shifting only when it hit 4500rpm. I tested the TPS and had 5 volts input and 4.6 volts output at all times. Even when the TPS is unplugged. I have replaced the TPS and PCM with no change. The jeep still idles high and shifts at 4500 rpm. I'm at my wits end. I'm also getting a code 24 from the computer.
You are still getting high or low voltage at tps? What is the voltage and do you have a unstable idle? Put you + lead on terminal 3 and - lead on terminal 1 turn ignition on and check voltage to be at approximately 5 volts. You can also back probe with it connected at center wire and ground probe to a good ground at engine. Turn ignition on it should read between 0.20 - 0.90 slowly manually open throttle it should rise all the way to 4.5 voltd at full open. If its bad change tps if no 5.0 volts from pcm on first test check connections at pcm. The center tps connector supply wire comes from pin 22 and connection 3 ( which is 5 volt supply ) comes from pin 6. You should be able to back probe pin 6 turn ignition on and have 5 volts. If not 5 v brain has problem.
You are still getting high or low voltage at tps? What is the voltage and do you have a unstable idle? Put you + lead on terminal 3 and - lead on terminal 1 turn ignition on and check voltage to be at approximately 5 volts. You can also back probe with it connected at center wire and ground probe to a good ground at engine. Turn ignition on it should read between 0.20 - 0.90 slowly manually open throttle it should rise all the way to 4.5 voltd at full open. If its bad change tps if no 5.0 volts from pcm on first test check connections at pcm. The center tps connector supply wire comes from pin 22 and connection 3 ( which is 5 volt supply ) comes from pin 6. You should be able to back probe pin 6 turn ignition on and have 5 volts. If not 5 v brain has problem. Call me if you need more help 5419427218 my name is Richard hopefully well get You back on the road.
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SOURCE: 1993 JEEP GRAND CHEROKEE AUTOMATIC TRANSMISSION
Likely you have a shift control module malfunction. Module is probably on the right side fender in the engine compartment. Check to see if you have one (some do and some dont... go figure...I've got a 91 & 95... I have about five different diagrams and NONE apply to my vehicles)
SOURCE: 94 jeep grand cherokee will not shift into overdrive
My 97 Jeep Grand Cherokee was doing the same thing. I changed the TPS ( Throttle Position Sensor) Now it is great goes into overdrive fine. It is really easy to change.
SOURCE: Change transmission fluide in 1999 Jeep Cherokee
Flush is Recomended Here as Changing Fluid can get Messy
SOURCE: shift indicator light 1999 Jeep Grand Cherokee
There are two parts to it, a voltage resistor, and the EL panel itself.
You need to remove the console first. There are 2 screws under the front rubber pad, two under the cup holder, two in the bin. Remove those six first, take the storage bin out, then slide the rear cupholder out, remove the two screws under the cup holder, and one in front of it.
There are a total of 6 flat screws, and 3 self tapping screws you have removed.
Put the parking brake on, shift the tranny to N, and the transfer case to the middle position if equipped.
Remove the entire console. Slide the shifter beezel as far up vertically as you can. There are 4 clips you ned to remove to do it.
You will see a blue and black wire running into the back. Follow those wires to the resistor. You will see a transparent EL panel attatched to the resistor by two clips.
Usually, one or both of these clips has come loose, causing the light to work intermittantly. Clip them back on, and turn on the headlights to confirm that the light works correctly now.
Re-install everything in the opposite order.
SOURCE: 2004 Jeep Cherokee 4.0 getting Error code P0505, I
Yes its possible that PCM, is issue, but its not possible that PCM is issue.---------
Do you notice the difference after replacing the idle, was the idle high or low before replacing the IAC valve? And did the idle problem solved after replacing the IAC valve.-----------
The check engine light will need to be reset with a scan tool, or you can wait and the computer will reset after the computer has seen that the problem is gone for a certain amount of starts. This is assuming that the IAC was actually the problem, there are other causes that can cause this code to set but if the idle was to high and now it is good the problem is likely fixed. some times it takes approx next 100 or 50 drive cycles to automatically reset the code.------------
But if you still notice the idle problem, even after replacing the IAC valve, then other possible causes for this same error code P0505 are:---
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