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Sensor Testing

Yahoo Message Number: 97999
During my 3,300 mile journey last month my engine temperature suddenly started to climb during a few of our driving segments. Fortunately I have installed the fan controller by-pass switch on my control panel so I was able to switch my fan to high as needed.
During most of this trip the fan would go into high speed at 207 degrees and switch to a lower speed at about 200 degrees. I was able to track this as I can hear the fan when it's on high. The fact that this happened very inconsistently leads me to believe my CAC temp sensor or my engine temp sensor are malfunctioning. So, today I went to my coach to check the ohms resistance of my sensors. According to the Sauer Danfoss Technical Information manual they should read between 1.2k to 3.0k ohms at the engine side of the 6 connector pin across pins C&D for coolant and E&F for charge air.
FINALLY TO MY PROBLEM! I only have a three pin connector coming from my fan controller. The Sauer Danfoss technical information manual does not address my three pin configuration setup.

Can someone shed some light on my situation? 2005 Country Coach Inspire #51264
Cat C-9 engine S/N 9DG01439

FAN CONTROLLER:

Sauer-Danfoss 0418
1090385

FDCA NC 12 VDC 1.2A HP 3000
S/W PARAMETERS: PO184204026A
S/N: 1215877

Thank You,
Ron Jacobs

Re: Sensor Testing

Reply #1 –
Yahoo Message Number: 98000
Ron,


You might want to call Eric @ Premier Motor Coach in Tucson. He worked on mine last spring. Premier's Number is 520-624-2024.


Jock Vargo

2005 Inspire C-9
51428

Re: Sensor Testing

Reply #2 –
Yahoo Message Number: 98001
Please post your findings here. I too have fan problems on my 05 Inspire (with a new S-D controller) and also have the 3 pin connector. Thanks.

Re: Sensor Testing

Reply #3 –
Yahoo Message Number: 98002
Ron, those same symptoms on my c9 were caused by a bad thermostat.
Jay 51457

Sent from my Verizon Wireless 4G LTE DROID
"RONANDSUE74@... [Country-Coach-Owners]" wrote:

During my 3,300 mile journey last month my engine temperature suddenly started to climb during a few of our driving segments. Fortunately I have installed the fan controller by-pass switch on my control panel so I was able to switch my fan to high as needed.
During most of this trip the fan would go into high speed at 207 degrees and switch to a lower speed at about 200 degrees. I was able to track this as I can hear the fan when it's on high. The fact that this happened very inconsistently leads me to believe my CAC temp sensor or my engine temp sensor are malfunctioning. So, today I went to my coach to check the ohms resistance of my sensors. According to the Sauer Danfoss Technical Information manual they should read between 1.2k to 3.0k ohms at the engine side of the 6 connector pin across pins C&D for coolant and E&F for charge air.
FINALLY TO MY PROBLEM! I only have a three pin connector coming from my fan controller. The Sauer Danfoss technical information manual does not address my three pin configuration setup.

Can someone shed some light on my situation? 2005 Country Coach Inspire #51264
Cat C-9 engine S/N 9DG01439

FAN CONTROLLER:

Sauer-Danfoss 0418
1090385

FDCA NC 12 VDC 1.2A HP 3000
S/W PARAMETERS: PO184204026A
S/N: 1215877

Thank You,
Ron Jacobs

Re: Sensor Testing

Reply #4 –
Yahoo Message Number: 98003
One of the first things to check when your engine temperatures start to behave erratically is the engine thermostat/s. Once you are sure that it is ok then you can proceed with the various other troubleshooting steps.
Not all CC fan controller installations used the air and coolant temperature sensors. Some were controlled by the ECM computer directly. In that case there may well be only the three wire control input plug rather than the 6. I am not sure about that but maybe some one that has the ECM driven controller will know the answer.

Don Seager

Former CC Owner

During my 3,300 mile journey last month my engine temperature suddenly started to climb during a few of our driving segments. Fortunately I have installed the fan controller by-pass switch on my control panel so I was able to switch my fan to high as needed.
During most of this trip the fan would go into high speed at 207 degrees and switch to a lower speed at about 200 degrees. I was able to track this as I can hear the fan when it's on high. The fact that this happened very inconsistently leads me to believe my CAC temp sensor or my engine temp sensor are malfunctioning. So, today I went to my coach to check the ohms resistance of my sensors. According to the Sauer Danfoss Technical Information manual they should read between 1.2k to 3.0k ohms at the engine side of the 6 connector pin across pins C&D for coolant and E&F for charge air.
FINALLY TO MY PROBLEM! I only have a three pin connector coming from my fan controller. The Sauer Danfoss technical information manual does not address my three pin configuration setup.

Can someone shed some light on my situation? 2005 Country Coach Inspire #51264
Cat C-9 engine S/N 9DG01439

FAN CONTROLLER:

Sauer-Danfoss 0418
1090385

FDCA NC 12 VDC 1.2A HP 3000
S/W PARAMETERS: PO184204026A
S/N: 1215877

Thank You,
Ron Jacobs

Re: Sensor Testing

Reply #5 –
Yahoo Message Number: 98005
Follow-on...

The 05 Inspire C-9 uses a different Sauer Danfoss fan drive controller (3 pin) than other CC models (6 pin). I discovered this when I was chasing my tail over a faulty thermostat (two, actually).

Re: Sensor Testing

Reply #6 –
Yahoo Message Number: 98006
Yes with the 3 wire connector you are using the ECM for that data. You have no sensors going directly to the SD controller. You either have a controller going bad or a thermostat. With the C9 you have 2 thermostats. One large and one small. I also had the same problem and in my case I had a bad controller along with a bad small thermostat. So not much help in pinpointing the problem.

Buddy 06 Inspire 360 C-9

Re: Sensor Testing

Reply #7 –
Yahoo Message Number: 98007
Thanks for everyone's input.

Mine is the three wire version so I guess it's ECM controlled. I will start with the easy cheap fix, attempt, and replace the thermostats. I'll post my results. RJ 2005 Inspire #51264

Re: Sensor Testing

Reply #8 –
Yahoo Message Number: 98008
Ron,

When you say your temperatures have started to climb what do you mean? What temperatures?

I ask because your later description of fan speed ramping up to high at 207 and ramping down at 200 are as designed. Modern diesels run 195 to 210 so I don't see a problem in your description.

George in Birmingham
'03 Magna 6298
George in Birmingham
2003 Magna 6298

Re: Sensor Testing

Reply #9 –
Yahoo Message Number: 98009
George,

When all is working as it should, my fan goes to high at 207 and down at about 200.
When I get the malfunction, the temp runs up to 220, my high temp light comes on, and I have to turn on my manual override switch.
Sorry if my description was a bit confusing.
RJ

2005 Inspire #51264

Re: Sensor Testing

Reply #10 –
Yahoo Message Number: 98010
Ron:

The range on my C9 is 185 to 207 depending on ambient temp and engine load. The turbo fan comes on at 204 and is controlled by the engine ECM. The 220 is abnormal for this engine as shut down is at 224.

A couple of things to check:

Check the integrity of the 3 wire connector and connection, apply dielectric grease to the pins.
Check the engine ECM to ensure that the fan controller setting is set to on/off - dc, if not that could cause the temp excursion to 220 or higher.
Check the fan speed, there is a procedure. If it does not pass the test, it could be a problem with the ECM output to the SD controller, SD controller, hydro pump, or hydro fan motor. CAT has a spec for the ECM output to the fan controller.
I've had your issue and solved it originally by changing the ECM controller setting, CC set up a lot of engines incorrectly. Eventually, I replaced the SD controller, pump and fan motor because I couldn't meet the fan speed spec. I also installed a fan speed switch and turn it on prior to ascending a mountain.

Hope this helps.

John Beach

06 Allure, 31309

Re: Sensor Testing

Reply #11 –
Yahoo Message Number: 98012
You're right Ron. 220 is too high.

Good luck

George in Birmingham
'03 Magna 6298
George in Birmingham
2003 Magna 6298

Re: Sensor Testing

Reply #12 –
Yahoo Message Number: 98014
Ron

When my C-9 began to overheat intermittently I cleaned the connection with electrical contact spray cleaner and applied dialectic grease and so far so good after about 6000 miles. I just repeated the process in preparation for my winter travels.

Dan 2006 Allure 31348