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Unread 06-27-2009, 08:47 PM   #1
home1028
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1995 jeep gran cherokee laredo

Question: Checking speed sensor. What common affects this would have if
sensor was defective? How would the transmission act?.

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Unread 06-27-2009, 11:02 PM   #2
ZeeJay1997
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Quote:
Originally Posted by home1028 View Post
Question: Checking speed sensor. What common affects this would have if
sensor was defective? How would the transmission act?.
You may get more response by posting which transmission you have. Some have 2 speed sensors.

You may also find the info your looking for by using the search function on this website.

The sensor is cheap, just change it out and save yourself a lot of troubleshooting time. Disco the battery b4 you start to dump the PCM memory.
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Unread 06-28-2009, 10:25 AM   #3
home1028
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I'm not sure what type transmission, but my 1995 jeep grand cherokee laredo is a 4.0. Checking error code (on,off,on,off and back on)
one flash pause 3 flash pause 5 flash pause 5 flash and it ends. Don't know which code it is.
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Unread 06-28-2009, 10:38 AM   #4
Mickey_D
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http://www.nagca.com/grandtech/troubleshootcodes.htm
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Unread 06-28-2009, 12:22 PM   #5
home1028
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1.I turned the ignition on and off and on the engine light goes on like it always does at start up then flashes off that begins three more blinks then pause then 5 more blinks then again 5 more blinks its that consider code 13?

2.does that indicates that MAP sensor its not working?

3. And if its code 13 would it make my trans. run at a slow pace, random
and make the ignition shut down?

Parts already replaced on vehicle recently, I changed coil, rotor with cap,replaced oil pressure sensor on top of oil filter on engine, also changed cables,replaced cps, changed speed sensor on rear of the trans. with the three wires and still have the same problem with the jeep.

Please help because on 13 on other error codes listings come out as a
no vehicle speed sensor signal. Please help if anyone has an idea or
is a simple sensor replacement problem.
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Unread 06-28-2009, 02:39 PM   #6
ZeeJay1997
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It sounds like a 13 and it could be an indication that the MAP is not working correctly. Check under it for a small 90* rubber elbow. If that looks okay, you may need to clean your throttle body. There's a small MAP port there that the elbow attaches to that gets stopped up sometimes.

Test MAP sensor supply voltage at sensor connector between terminals A and C with the ignition ON. The voltage should be approximately 5 volts.

Test the MAP sensor output voltage at the MAP sensor connector between terminals A and B. With the ignition switch ON and the engine OFF, output voltage should be 4-to-5 volts. The voltage should drop to 1.5-to-2.1 volts with a hot, neutral idle speed condition.
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Unread 06-28-2009, 06:17 PM   #7
home1028
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If MAP sensor error pops up can this be do to throttle body dirty and IAC
been dirty. Can this contribute to trans. not rising to proper gear? when I manually shift trans. it seems to have all its gears then when I put it into drive motor shuts down sometimes, mainly when engine its hot and shifting problems begin with trans.
I also notice the vehicle is having this problem with the trans. mostly when
the vehicle has been running hot for a period of time. Changed the CPS
and stopped having the engine shut down for a while but still had the trans.
shifting problem. Now engine shut off started again more frequently.

Any help would be appreciated.

Last edited by home1028; 06-28-2009 at 06:33 PM..
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Unread 06-28-2009, 07:44 PM   #8
ZeeJay1997
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Have you checked / changed fluid lately? Adjusted bands?

The tranny is dependent on the engine and sensors so try to lose the code before you start to far into the tranny
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Unread 06-30-2009, 02:37 PM   #9
home1028
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I changed the sensor MAP, let battery run for an hour and still the same error code (13) comes up. Fluids are fine. Can you please explain Band?
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Unread 07-03-2009, 04:08 PM   #10
home1028
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Code 12

code 12 is the error code i am getting not 13 like i originally thought.
just my mistake counting flashes and $50. dollars less out of my pocket.error 12 comes up as Direct battery input to PCM was disconnected within the last 50 key-on cycles. which some say is common . My question is Would the input or either output sensors would cause the trans. to not shift in a timely fashion
meaning from first to second? when i shift manual doesn't seem to be any power loss or slip, reverse fine too just seems to have the problem when the motor is hot, Does anyone know if this is an faulty input or output sensor on transmission issue? If anyone had a similar experience with output or input sensor any information in this area would be appreciated ?
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