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  #37  
Old 08-03-2014, 02:28 PM
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Hi, that's a good idea. Just one thing, I need to do that when the transmission over temp message comes on, correct? We've already checked the electrical systems (battery, started, etc.) and transmission (besides it's insides) have even flushed the tranny cooler lines. Jeep dealer said they were not able to duplicate the message after 2 drives and a few hours with a tranny specialist.

Some info:

1. I received this message the day or week after I gave someone a long boost on a dead battery.
2. I had my water pump changed a month earlier because it was leaking.
3. All oils changed the last 2 years.
4. My front wheel bearings were changed a few weeks ago during the same time I first got that message. They were damaged when I went over a huge pothole at night...changed them
5. Jeep required a tow because of dead battery 2 weeks after bad boost. Battery was recharged, garage said it was drained.

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  #38  
Old 08-03-2014, 03:36 PM
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Re: Transmission Over Temp Message 4.7 WK

Quote:
Originally Posted by Laredo2006 View Post
Hi, that's a good idea. Just one thing, I need to do that when the transmission over temp message comes on, correct?
Correct.
Quote:
Some info:

1. I received this message the day or week after I gave someone a long boost on a dead battery.
2. I had my water pump changed a month earlier because it was leaking.
3. All oils changed the last 2 years.
4. My front wheel bearings were changed a few weeks ago during the same time I first got that message. They were damaged when I went over a huge pothole at night...changed them
5. Jeep required a tow because of dead battery 2 weeks after bad boost. Battery was recharged, garage said it was drained.
It almost sounds like you damaged your alternator during the boost and the battery discharged over the next week or two while driving. I'm not sure how this could affect the transmission other than provide bad voltage. If your battery reads 13 to 14 VDC and less than 0.1 VAC at the terminals while running with all accessories off, I'd eliminate electrical from the list....for now anyways. Getting a true temperature with a meter on the transmission pan immediately after an overheat is the most important thing right now.
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  #39  
Old 08-03-2014, 04:01 PM
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Re: Transmission Over Temp Message 4.7 WK

Roger that, infrared lights are easily available? It will even show in the day? I have to the jeep, get right under the transmission and open the infrared how do I do this?
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  #40  
Old 08-03-2014, 05:51 PM
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Re: Transmission Over Temp Message 4.7 WK

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Originally Posted by Laredo2006 View Post
Roger that, infrared lights are easily available? It will even show in the day? I have to the jeep, get right under the transmission and open the infrared how do I do this?
They are referred to as "Infrared guns". You aim and pull the trigger. They are readily available for $50 - $75.

http://www.amazon.com/gp/aw/d/B002YE...&robot_redir=1
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  #41  
Old 08-03-2014, 08:44 PM
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Re: Transmission Over Temp Message 4.7 WK

Quote:
Originally Posted by ExcursionDiesel View Post
They are referred to as "Infrared guns". You aim and pull the trigger. They are readily available for $50 - $75.

http://www.amazon.com/gp/aw/d/B002YE...&robot_redir=1

Didn't realise these were so cheap ,thanks for the link


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  #42  
Old 08-03-2014, 08:47 PM
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Re: Transmission Over Temp Message 4.7 WK

Hey where do I point this exactly? I get under the jeep and towards the transmission? Or from inside the hood? Thx
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  #43  
Old 08-03-2014, 09:43 PM
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Re: Transmission Over Temp Message 4.7 WK

Well I ended up buying this one, hopefully it can be here buy August 15...

Non Contact LCD IR Laser Infrared Digital Temperature Thermometer Gun TE | eBay
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  #44  
Old 08-04-2014, 12:10 AM
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Re: Transmission Over Temp Message 4.7 WK

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Originally Posted by Laredo2006 View Post
Hey where do I point this exactly? I get under the jeep and towards the transmission? Or from inside the hood? Thx
The bottom of the transmission oil pan should be the closest to the internal temperature. It holds the hot trans oil.
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  #45  
Old 08-04-2014, 11:44 AM
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Re: Transmission Over Temp Message 4.7 WK

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Originally Posted by ExcursionDiesel View Post
Next step is to use an Infrared Temperature meter (gun) and verify that the transmission temperature agrees with the sensor reading. An ODB2 scanner can be used to read the value of the sensor for the ECU. If the two don't agree within a few degrees, you have a bad sensor. If they agree and the tranny is in fact too hot, you may have a faulty cooling system....thermostat, radiator, transmission cooler, etc.

You need to do this before you cook something and it cost you big $$$.
Hi again excursion, want to say thx for all the help you and frango are giving me here. I ordered the infrared reader and will now wait, the message has not appeared again in the last 2 weeks almost. But than again, I have not driven for over 20 straight kilometers. One thing I did not understand how to do was the ODb2 scanner to read the value of the sensor for the ecu, what is that exactly? How will I do that, I think I will be able to do the infrared reading, but that....hmm
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  #46  
Old 08-04-2014, 12:42 PM
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Re: Transmission Over Temp Message 4.7 WK

Just some info from our tech material - ignore if not helpful/interesting:

OPERATION
The transmission temperature sensor is used by the TCM to sense the temperature of the fluid in the sump. Since fluid temperature can affect transmission shift quality and convertor lock up, the TCM requires this information to determine which shift schedule to operate in.

Calculated Temperature
A failure in the temperature sensor or circuit will result in calculated temperature being substituted for actual temperature. Calculated temperature is a predicted fluid temperature which is calculated from a combination of inputs:

Battery (ambient) temperature
Engine coolant temperature
In-gear run time since start-up

OPERATION
The transmission over-temperature indicator gives an indication to the vehicle operator when the transmission fluid temperature is excessive, which may lead to accelerated transmission component wear or failure. This indicator is controlled by the instrument cluster logic circuit based upon cluster programming and electronic messages received over the Controller Area Network (CAN) data bus from the Powertrain Control Module (PCM).

The transmission over-temperature indicator function of the reconfigurable dot matrix Organic Light Emitting Diode (OLED) display unit is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the OLED transmission over-temperature indication will always be OFF when the ignition switch is in any position except ON or START. The instrument cluster will turn ON the transmission over-temperature indicator for the following reasons:

Trans Over-Temp Indicator Lamp-On Message - Each time the cluster receives an electronic trans over-temp indicator lamp-ON message from the PCM indicating that the fluid temperature is 135 C (275 F) or higher, the transmission over-temperature indicator will be illuminated and a single chime tone is sounded. The indicator remains illuminated until the cluster receives a lamp-OFF message from the PCM, or until the ignition switch is turned to the OFF position, whichever occurs first. The chime tone feature will only repeat during the same ignition cycle if the indicator is cycled OFF and then ON again by the appropriate lamp-ON and lamp-OFF messages from the PCM.
The PCM continually monitors the transmission temperature sensor to determine the transmission operating condition. The PCM then sends the proper lamp-ON or lamp-OFF message to the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN). If the instrument cluster illuminates the transmission over-temperature indicator due to a high transmission oil temperature condition, it may indicate that the transmission or the transmission cooling system are being overloaded or that they require service.

For proper diagnosis of the transmission temperature sensor, the PCM, the EMIC, the CAN data bus or the electronic communication related to transmission over-temperature indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.

DESCRIPTION
The Transmission Range Sensor (TRS) is part of the solenoid module, which is mounted to the top of the valve body inside the transmission.

The Transmission Range Sensor (TRS) has five switch contact pins that:

Determine shift lever position
Supply ground to the Starter Relay in Park and Neutral only.
Supply +12 V to the backup lamps in Reverse only.
The TRS also has an integrated temperature sensor (thermistor) that communicates transmission temperature to the TCM and PCM.
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  #47  
Old 08-04-2014, 01:24 PM
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Re: Transmission Over Temp Message 4.7 WK

You can order a Bluetooth to ODB2 adapter for $25 USD and an Android App called Torque for $6 USD. If you are an iPhone user, there is a WIFI to ODB2 adapter and app available. A search of this forum will lead you to the info.

There are other dedicated ODB2 scantools but the smartphone app method is a better option IMO.
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  #48  
Old 08-04-2014, 07:16 PM
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Re: Transmission Over Temp Message 4.7 WK

Yes, in one of my previous posts i had already recommended to check the transmission pan temperature with an infrared gun. Since you can't see the transmission temperature yourself and should ask the dealer or some mechanic with the right scanner (=$$$) to compare the indicated temperature with the infrared gun, i would just check the pan temperature at the moment the overtemp message is displayed.
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