I have several codes on my 2008 D6N LGP machine as follows: Mechanic's Assistant: Have you seen this code before with the same vehicle? No Mechanic's Assistant: Can you confirm the make, model, and year of your car? Anything else you want the Mechanic to know before I connect you? See first text

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I have several codes on my 2008 D6N LGP machine as follows:

I have several codes...

I have several codes on my 2008 D6N LGP machine as follows:

Mechanic's Assistant: Have you seen this code before with the same vehicle?

Mechanic's Assistant: Can you confirm the make, model, and year of your car? Anything else you want the Mechanic to know before I connect you?

See first text

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Ask Your Own Construction and Road Equipment Question

Answered in 5 minutes by:

9/27/2020

Mechanic: catmastertech, Technician replied 2 years ago

catmastertech, Technician

Category: Construction and Road Equipment

Satisfied Customers: 4,154

Experience: Field service technician for CAT 19 years.

Verified

Hey, sorry to hear you are having these problems. I know that can be frustrating. Hopefully, we can get you back to work quickly. I see no one could help you earlier, and I hope this is not too late to be helpful. Please note that I am not set up for phone calls, you can ignore the site pop-ups. We can post to this chat as much as you like to work through this issue. All experts are not employees, and we work from home in our spare time to answer questions.

What are the codes you have recorded? Please note the active codes (marked by the words SERV CODE when shown) and any Event codes (marked by the letter E in the code)

Please include the complete machine serial number (PIN) with your reply.

Thanks, Don

Customer reply replied 2 years ago

I’ll indicate SC for service code faultsSC30
SC E0179.1(###) ###-####12
SC113
SC0673.02
END(###) ###-####03(###) ###-####02(###) ###-####02

Mechanic: catmastertech, Technician replied 2 years ago

Do you have the serial number?

Customer reply replied 2 years ago

From what I can find, in order of codes above,
Monitor Fault
Alt not charging
Transmission Fault
Transmission shift lever FMI 12 bad device or component
Transmission output speed 2 sensor: FMI 02 Data erratic, intermittent, or incorrect
Signal voltage of fuel sender voltage too highNot sure about the 0248.02 and 0819.02 codesDJY00870

Mechanic: catmastertech, Technician replied 2 years ago

Basically, the 248 and 819 codes are data link problems were the ECMs are not communicating. Since these are logged and not active, they may have been created during troubleshooting.

Customer reply replied 2 years ago

There was a plug the is on the back of the machine that came undone. I had a winch on the machine and there are two large hydraulic hoses that go to what looks like a filter housing (approx 5" diameter x 1o-12" long)I saw an indicator light on the panel flashing and I stopped and plugged it in, light went off.About 20 minutes later I started having these codes. I now get a flashing "!" On the display panelMachine operates okay. Is it safe to drive it back to my building?

Mechanic: catmastertech, Technician replied 2 years ago

Which code is the very first code to appear when you check them?

Customer reply replied 2 years ago

Did you get the video?

Mechanic: catmastertech, Technician replied 2 years ago

No.

If the code is the E0179, that should be the alternator is not charging.

The machine can run until the batteries are too weak to power the solenoids.

Customer reply replied 2 years ago

First SC code 030
Then E0179.1 alternator not charging
Then SC 113 transmission faults of 0668.12 and SC 0673.02

Mechanic: catmastertech, Technician replied 2 years ago

If it is the 673-02 code that is active, you might find a gear that will work to move the machine but, if it is used in the gear selected, it will sound the alarm or stop the machine.

If it is only an alarm, it is not a problem to move the machine. The code is for an output speed sensor.

Customer reply replied 2 years ago

Then is says END but then there are more codes after END

Mechanic: catmastertech, Technician replied 2 years ago

The 668-12 code is like from a worn shift handle or damaged wiring for the direction shift position sensor.

The possible causes of this diagnostic code are listed below:

The detents for the transmission shift lever are not functioning properly.
The signal for the transmission shift lever is not within the correct range.
The transmission shift lever has not been operated properly.

Customer reply replied 2 years ago

After END, then:(###) ###-####03(###) ###-####02(###) ###-####02

Mechanic: catmastertech, Technician replied 2 years ago

Logged codes are not active and are best used to help with troubleshooting but, shold not be an issue at the current time.

Customer reply replied 2 years ago

34;Transmission shift lever not operated properly"What do you mean by that? How can you improperly operate it?I typically just keep it in one speed, "low" so I don't beat the crap out of the undercarriage

Mechanic: catmastertech, Technician replied 2 years ago

It is a position sensor and it is not sending out the proper readings for the gear selected. Sensors are expected to work in a small range and if the signal is outside that range it is a fault.

Wear is a common cause for this

Customer reply replied 2 years ago

I know how to verify alternator charging or not. To fix, is there something else to test besides the alternator itself?Where are the transmission sensors? How do I test/verify/repair/replace?0668.12 and 0673.02

Mechanic: catmastertech, Technician replied 2 years ago

Use a volt meter to check the alternator and the battery voltages

Customer reply replied 2 years ago

Liked “Use a volt meter to check the alternator and the battery voltages”

Mechanic: catmastertech, Technician replied 2 years ago

Check and compare at both loactions

Customer reply replied 2 years ago

Just wanted to me sure there isn't an external regulator somewheremake

Mechanic: catmastertech, Technician replied 2 years ago

A load test may be needed to verify the batteries are good

Customer reply replied 2 years ago

One battery was shorted before using the machine this time . It was replaced and both batteries were load tested before use

Mechanic: catmastertech, Technician replied 2 years ago

The green wire is the a signal to the monitor

Customer reply replied 2 years ago

Battery shorted = dead, failed load test)Can you point me to the other transmission sensors ? Do you have any diagrams you can text or email?

Mechanic: catmastertech, Technician replied 2 years ago

The speed sensors are inside the transmission and it must be removed to replace them

Customer reply replied 2 years ago

Average cost of that repair? And what happens if you keep using the machine?

Mechanic: catmastertech, Technician replied 2 years ago

$1000 to $5000 depending on how much repair is needed for the wiring harnesses. Old tractors usually need one of more harnesses and this could be the cause of this fault. If testing shows the harnesses are good, then the transmission must be pulled to access the sensors. A few models could be accessed under the seat but, only the early models had this option. and then it had to be the sensor on the top that had the fault needing replacing.

Then machine will not auto shift and may slam when shifting without the speed sensors working.

Customer reply replied 2 years ago

Occasionally, I will hear a noise (boom) and think it's in the transmission. Sounds like a sledge hammer hitting a drum. No warning, no issues with operation, no other symptoms. Thoughts?

Mechanic: catmastertech, Technician replied 2 years ago

If the transmission has a lot of hours on it, a series of calibrations can be done to help smooth out the shifting.

Beyond that, it could be wear in the final drives. Or just a worn out track rail.

Customer reply replied 2 years ago

3000 hours

Mechanic: catmastertech, Technician replied 2 years ago

That enough a calibration could help

Customer reply replied 2 years ago

the machine can be driven back even though the " ! " light is flashing ?

Mechanic: catmastertech, Technician replied 2 years ago

Here is the testing needed to check the speed sensor.

Test Step 1. CHECK THE SENSOR AND CHECK THE HARNESS AT THE TRANSMISSION

Before performing the following procedures, verify that the battery power in the ohmmeter is good and verify that the ohmmeter is set to the proper range of resistance.

Turn the key start switch to the OFF position.

Disconnect the machine harness from the internal harness of the transmission at the transmission case.

At the transmission case, measure the resistance between the two contacts of the sensor.

Table 1

Coil Resistance for TOS Sensor

Speed Sensor Part # Sensor Coil Resistance

3E-8848 1100 ± 100 ohms @ 25° C (77° F)

(###) ###-####(###) ###-####(###) ###-####1450 ± 180 ohms @ 25° C (77° F)

Expected Result:

The resistance is within the range listed in Table 1.

Results:

OK - The TOS sensor circuit resistance is within the listed range.The speed sensor and the internal harness for the transmission have not failed. Proceed to Test Step 3.

NOT OK - The TOS sensor circuit resistance is NOT within the listed range. The speed sensor and the internal harness for the transmission have failed. Proceed to Test Step 2.

Test Step 2. CHECK THE RESISTANCE OF THE SENSOR

Disconnect the speed sensor from the internal harness of the transmission.

Measure the resistance between the two contacts of the connector for the speed sensor.

Expected Result:

The resistance is within the range listed in Table 1.

Results:

OK - The TOS sensor resistance is within the listed range.

Repair: The internal harness for the transmission has failed. Repair the internal harness for the transmission or replace the internal harness for the transmission.

STOP

NOT OK - The TOS sensor resistance is NOT within the listed range.

Repair: The speed sensor has failed. Replace the sensor. Adjust the speed sensor properly when the sensor is installed. See Testing and Adjusting, "Speed Sensor - Adjust".

STOP

Test Step 3. CHECK THE SIGNAL CIRCUIT FOR AN OPEN IN THE MACHINE HARNESS

The key start switch is OFF and the machine harness is disconnected from the internal harness of the transmission at the transmission case.

At the machine harness connector for the transmission, place a jumper between the two contacts that correspond to the sensor.

Disconnect the machine harness connector J2 from the ECM.

At the J2 harness connector, measure the resistance between the positive signal contact and the negative signal contact for the suspect sensor.

Expected Result:

There should be less than 5.0 ohms resistance.

Results:

OK - There is less than 5.0 ohms resistance. The machine harness is correct. Proceed to Test Step 4.

NOT OK - There is not less than 5.0 ohms resistance.

Repair: There is an open circuit in the machine harness. The open is in positive signal wire or the negative signal wire of the machine harness. Repair the machine harness or replace the machine harness.

STOP

Test Step 4. CHECK THE SIGNAL CIRCUIT FOR A SHORT

If a jumper was used in a previous step, remove the jumper.

Reconnect the machine harness to the internal harness of the transmission at the transmission case.

At the J1 and J2 harness connectors, measure the resistance between the + signal contact (J2-25) and all sources of positive voltage and ground. The possible sources of positive voltage are contacts J1-1, J1-4, J1-6, J1-8, J1-10, J1-11, J1-12, J1-17, J1-18, J1-40, J2-1, J2-2, J2-7, J2-8, J2-13, J2-19, and J2-37. The possible sources of ground are contact J1-2, contact J1-5, contact J1-7, contact J1-15, contact J1-16, contact J2-3 and frame ground.

At the J1 and J2 harness connectors, measure the resistance between J2-31 and all sources of positive voltage and ground. The possible sources of positive voltage are contacts J1-1, J1-4, J1-6, J1-8, J1-10, J1-11, J1-12, J1-17, J1-18, J1-40, J2-1, J2-2, J2-7, J2-8, J2-13, J2-19, and J2-37. The possible sources of ground are contact J1-2, contact J1-5, contact J1-7, contact J1-15, contact J1-16, contact J2-3 and frame ground.

Expected Result:

Each resistance should be greater than 5000 ohms.

Results:

OK - Each resistance is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 5.

NOT OK - Each resistance is not greater than 5000 ohms.

Repair: There is a short in the machine harness. There is a short between the signal circuit and the circuit with a low resistance measurement. Repair the machine harness or replace the machine harness.

STOP

Test Step 5. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE

Clean the contacts of the harness connectors.

Reconnect all harness connectors.

Turn the key start switch to the ON position.

Start the engine and run the engine at low idle.

Operate the machine. For transmission output speed sensors and the intermediate speed sensors, this step will require the machine to be moving.

Enter service mode of the Caterpillar Monitoring System. Put the diagnostic code on hold.

Observe the status of the diagnostic code indicator.

Expected Result:

The diagnostic code indicator shows "SERV CODE".

Results:

YES - The diagnostic code indicator shows "SERV CODE". Proceed to Test Step 6.

NO - The diagnostic code indicator does not show "SERV CODE".

Repair: The diagnostic code is NOT present. The problem does not exist at this time. The initial problem was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.

STOP

Test Step 6. CHECK THE ADJUSTMENT OF THE SENSOR

Note: The transmission must be removed in order to adjust the speed sensor.

Check the speed sensor adjustment. See Testing and Adjusting, "Speed Sensor - Adjust".

Clean the contacts of the harness connectors.

Reconnect all harness connectors.

Turn the key start switch to the ON position.

Start the engine and run the engine at low idle.

Operate the machine. For transmission output speed sensors and the intermediate speed sensors, this step will require the machine to be moving.

Enter service mode of the Caterpillar Monitoring System. Put the diagnostic code on hold.

Observe the status of the diagnostic code indicator.

Expected Result:

The diagnostic code indicator shows "SERV CODE".

Results:

YES - The diagnostic code indicator shows "SERV CODE".

Repair: Replace the speed sensor. Adjust the speed sensor. See Testing and Adjusting, "Speed Sensor - Adjust".

Proceed to Test Step 7.

NO - The diagnostic code indicator does not show "SERV CODE".

Repair: The adjustment of the speed sensor corrected the problem. Resume normal machine operation.

STOP

Test Step 7. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE

Remove connectors J1 and J2 from the ECM. Inspect the contacts and clean the contacts of the harness connectors.

Turn the key start switch to the ON position.

Enter service mode of the Caterpillar Monitoring System and clear all inactive diagnostic codes.

Operate the machine.

Determine if the diagnostic code for the speed sensor is present.

Expected Result:

CID 673 FMI 2 is present.

Results:

YES - CID 673 FMI 2 is present.

Repair: Exit this procedure and perform the diagnostic code procedure again. If the problem persists, the ECM may have failed. Prior to replacing an ECM, contact your dealer Technical Communicator (TC) for possible consultation with Caterpillar. This consultation may greatly reduce repair time. See the Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

STOP

NO - CID 673 FMI 2 is not present.

Repair: The problem does not exist at this time. The new speed sensor corrected the problem. Resume normal machine operation.

STOP

Yes, it can be moved as long as it is not jumping out of gear or slamming hard into gear.

Customer reply replied 2 years ago

Okay, thank you. Are you able to receive photos?

Mechanic: catmastertech, Technician replied 2 years ago

You can upload files and pictures using this site. If you cannot get that to work, send a link to a cloud share site and we can view them there.

Customer reply replied 2 years ago

File attached (34S1LMP)

6DF9DEE5-B60E-445C-B864...jpeg6DF9DE...jpeg

Customer reply replied 2 years ago

Just sent one - let me know when you get it

Mechanic: catmastertech, Technician replied 2 years ago

yes, I see it

Customer reply replied 2 years ago

What is the canister looking part that has the 2 hoses running to it? The small wire on the left going to the bottom is what came unplugged about 20 - 30 minutes before these problems started.

Mechanic: catmastertech, Technician replied 2 years ago

That is your transmission filter

The wire is likely the filter bypass warning switch

Customer reply replied 2 years ago

Thanks. One last question - the machine appears to have been configured for a hydraulic winch, which was removed. Joystick control in the cab. I have a CAT ripper that I purchased and it only has 2 hydraulic hoses that operate the cylinder. There doesn't appear to be any place on the machine to connect the hoses. Any ideas as to what's needed to connect and use?

Mechanic: catmastertech, Technician replied 2 years ago

Check your hydraulic control valve to see if it has a fourth section. If so, normally a line (tubes) kit will make the connection to the rear of the machine for the hoses.

I am not sure if the winch control can be adapted but, if not the ripper control handle will fit in the same place.

The sale department might have a kit to convert it otherwise the parts guys must order it piece by piece.

Customer reply replied 2 years ago

Okay, thank you!

Mechanic: catmastertech, Technician replied 2 years ago

I have installed the lines kit before but, I haven't converted a winch out. It could be a little more work but, I am not for certain how much.

Mechanic: catmastertech, Technician replied 2 years ago

Glad I could help.

Thank you for using JustAnswer, if you do need further help please let me know.

If you are satisfied with my service, please take a moment to provide a rating.

Thanks again, Don

CATMASTERTECH

catmastertech, Technician

Category: Construction and Road Equipment

Satisfied Customers: 4,154

Experience: Field service technician for CAT 19 years.

Verified

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