PB Challenger surging and "crunch"

[cookie9]

The updates and SQL were free for me. Which was a surprise... my car is well out of warranty. Apart from some problems, the service manager does seem to try his best to help out.

they did SQL on mine twice that day. they must have to perform an SQL after an update so they had to do it again.

[jimiw]

I just rang them and they said the SQL figures were correct and my auto/ECU updates were done when the engine overheating recall was looked at (i didnt own the car then)

does this sound right?

Warranty runs out in May so not sure what to do now

[SwampFox55]

I just rang them and they said the SQL figures were correct and my auto/ECU updates were done when the engine overheating recall was looked at (i didnt own the car then)

does this sound right?

Warranty runs out in May so not sure what to do now

Jimiw,

These are the SW part numbers you need to have installed. They came out well after the overheating recall and OJ mentioned them back in October in another thread. I contacted my dealer a couple of times and they didn’t know anything about them until I persisted and even then there was no assurance until the MUT was connected. I was the first customer at a very large dealership to ask for them to be loaded. I had to pay for the labour.

1. Change of ATF-temperature-control-pattern. New S/W part number 8631 B047 70B.

2. Change the pre-injection amount for torque sudden change improvement to prevent cruise control hunting. New S/W part number 1860B 5555 06.


General Request:

1. Has anyone noticed a change to the various diesel noises & rattles coming from their engine since October, before or after the AT unlocks under load. Also, any change to the average engine sound level or pitch, when puttering about the burbs or at highway speeds?

2. Has anyone noticed a change to these sounds after these SW updates were/are installed?


My engine has been running quieter since November (no change at idle) and is better now than ever before – bought it new at 14km. It could be Cetane Number, the pre-injection SW change or, something else. I have observed no change to shift pattern which I expected with the ATF mod. I haven’t towed since, so I’ll need to wait until then.

Cheers,


SF55
170123

Reference:

https://www2.pajeroclub.com.au/forum...829#post532829

post #32

[whereswes]

Jimiw,

1. Change of ATF-temperature-control-pattern. New S/W part number 8631 B047 70B.

Very interesting. My dealer advised me that changes in the ATF temperature control software was partly to blame for the increased run time of my thermo fan. Thanks for that.

Cheers
Wes

[littleriver]

Very interesting. My dealer advised me that changes in the ATF temperature control software was partly to blame for the increased run time of my thermo fan. Thanks for that.

Cheers
Wes

didn't realise there is a thermo fan, only airconditioning fan

thought only cooling fan for motor is the viscous coupling fan attached to front of motor ?





...

[jimiw]

Jimiw,

These are the SW part numbers you need to have installed. They came out well after the overheating recall and OJ mentioned them back in October in another thread. I contacted my dealer a couple of times and they didn’t know anything about them until I persisted and even then there was no assurance until the MUT was connected. I was the first customer at a very large dealership to ask for them to be loaded. I had to pay for the labour.

1. Change of ATF-temperature-control-pattern. New S/W part number 8631 B047 70B.

2. Change the pre-injection amount for torque sudden change improvement to prevent cruise control hunting. New S/W part number 1860B 5555 06.


General Request:

1. Has anyone noticed a change to the various diesel noises & rattles coming from their engine since October, before or after the AT unlocks under load. Also, any change to the average engine sound level or pitch, when puttering about the burbs or at highway speeds?

2. Has anyone noticed a change to these sounds after these SW updates were/are installed?


My engine has been running quieter since November (no change at idle) and is better now than ever before – bought it new at 14km. It could be Cetane Number, the pre-injection SW change or, something else. I have observed no change to shift pattern which I expected with the ATF mod. I haven’t towed since, so I’ll need to wait until then.

Cheers,


SF55
170123

Reference:

https://www2.pajeroclub.com.au/forum...829#post532829

post #32

hey swampfox55
thanks so much! this will help a lot. I've contacted the dealer I bought the car from to see if they can do this. its a long trip away but I really wasn't impressed with the service from the Nundah Brisbane dealer I took it to yesterday they didn't even offer me a drive with a mechanic which the dealer I bought it from offered straight away.

Thanks!!

[whereswes]

didn't realise there is a thermo fan, only airconditioning fan

thought only cooling fan for motor is the viscous coupling fan attached to front of motor ?





...

My apologies, you are correct. I was referring to the viscous coupling fan and why I'm struggling to work out the relationship between this and the ATF coolant temp software (unless it's allowing it to run hotter)

[shortSteve]

didn't realise there is a thermo fan, only airconditioning fan

thought only cooling fan for motor is the viscous coupling fan attached to front of motor ?





...

My auto PC has an extra electric controlled fan on the front of the radiater, top left above the auto transmission cooler. Both my manual PB and my manual MN Triton did not have this fan fitted.
I only noticed because I went to fit the transmission cooler relocation kit that I ordered with the ARB bar, cannot fit on PC

sS

[coughy]

that is the ac fan it works of the auto ac controll unit
turns on and off with the temp sensor inside the car near your left knee
so car inside temp hot it cranks
if in car inside cool it dont do much at all

[old Jack]

I only have the circuit diagrams for Challenger MY09 to MY11 but in these models the A/C condenser fan coil relay, which is what switches the condenser fan on and off is connected to both the Engine and the AT ECUs.
Without knowing the logic of the ECU programs it is likely that;
1. The Engine ECU ensures the A/C condenser fan is switched on when the A/C when the vehicle speed is below a certain limit to ensure there is adequate airflow across the condenser so the A/C works. It also raises the idle rpm whilst the A/C is selected on. It would be also possible, if it was programmed to do so, for the Engine ECU to switch on the condenser fan if coolant temperature was above a certain limit, I have not tested this to see if this occurs.
2. The reason for the activation of the A/C condenser relay coil by the AT ECU is not as clear as the fA/C condenser fan does not provide any airflow over the ATF cooler. The only possible reason I can think of is that at elevated ATF temps the A/C condenser fan is switched on by the AT ECU as precaution measure so heat soak from the ATF section of the radiator has a reduced impact on the engine coolant section of the radiator and therefore coolant temperature.

OJ.

[coughy]

mine has a ac ecu oj that controls the fan with the help of the internal sensor and there in as outhside temp sensor at the fron of the radiator as well

[coughy]

hey swampfox55
thanks so much! this will help a lot. I've contacted the dealer I bought the car from to see if they can do this. its a long trip away but I really wasn't impressed with the service from the Nundah Brisbane dealer I took it to yesterday they didn't even offer me a drive with a mechanic which the dealer I bought it from offered straight away.

Thanks!!

lol looks like mine is way out of date lol i need to see a stealer to updtae lol

this is what the stealers see

[old Jack]

mine has a ac ecu oj that controls the fan with the help of the internal sensor and there in as outhside temp sensor at the fron of the radiator as well

I have looked closely at the circuit diagram for the automatic air-conditioning and the fan which is controlled by the internal temperature sensor and the outside air temperature is the internal cabin blower fan and not the A/C condenser fan mounted on the front of the condenser in front of the radiator. The A/C condenser fan operation is the same in all MY09 to MY11 and is controlled by both the Engine and AT ECUs.

OJ.

[whereswes]

2. The reason for the activation of the A/C condenser relay coil by the AT ECU is not as clear as the fA/C condenser fan does not provide any airflow over the ATF cooler. The only possible reason I can think of is that at elevated ATF temps the A/C condenser fan is switched on by the AT ECU as precaution measure so heat soak from the ATF section of the radiator has a reduced impact on the engine coolant section of the radiator and therefore coolant temperature.

OJ.

Hi OJ. That is interesting and consistent with the behavior I'm getting.

Engine temp has no influence on the fans operation that I can tell. I can let the motor idle up to operating temperature and then run hard to +90 deg without any fan noise until ............ A/T temps reach the high 50s/low 60s.

I then get fan operation in each gearing driving up through from idle to around 2,500 rpm. It then gradually stops (winds down) until I accelerate again.

Ambient air temp appears to have very little influence other than how quickly the A/T warms up.

What doesn't make sense is whilst the fan is operating, there appears to be loss of power which I cannot explain. Not huge, but definitely noticeable.

Dealer says normal fan operation but I know it wasn't there from new. They also blame restricted airflow from the TJM bar, again which was fitted from new, by them.

Happened on a weekend. Friday OK. Saturday refueled. Sunday pressure washed (just exterior, not engine bay). Monday, excess fan operation. That was over a year ago.

Cheers
Wes

[whereswes]

mine has a ac ecu oj that controls the fan with the help of the internal sensor and there in as outhside temp sensor at the fron of the radiator as well

Coughy, you've given me food for thought. Outside temp sensor in front of the radiator.

A couple of days desert driving. A week later, a high pressure wash through the grill.

Just maybe ..........

Also after stuffing around with different bash plate set ups to redirect air, not an ounce of difference.

Cheers
Wes