Quote:
Originally Posted by Runoffroad
Hi all,
Another 5 speed Transmission issue
New TCM installed. No codes on Full Jscan
JScan Live Data
........ idle for 15mins from cold start (all ok)
Transmission Transmission Transfer
Shift & EVIC Temp. Case. Status
Position
Park 49°C AWD Auto - AWD
Rev 37°C AWD Auto - AWD
Neut 49°C AWD Auto - AWD
Drive 37°C AWD Auto - AWD
Park - T/case position sensor voltage 2.53v
Rev - T/case position sensor voltage 2.86v
Neut - T/case position sensor voltage 2.55v
Drive - T/case position sensor voltage 2.98v
.........Engine idle for 30 minutes
Transmission Transmission Transfer
Shift & EVIC Temp. Case. Status
Position
Jscan
Park (Park) 68°C AWD Auto -AWD
Rev. (disengaged) 37°C AWD Auto -AWD
Neut (disengaged) 65°C AWD Auto -AWD
Drive(disengaged) 37°C AWD Auto -AWD
Transfer Case position sensor voltages as above.
.....Using Jscan
with shift in Drive I "Bussed Current Gear" & it shows 1st & then current gear changes from "disengaged" to "1st" even though the transmission is actually still disengaged
Turn engine off & wait 10 minutes and everything is good again & then all the above starts over again.
I have done a lot of work with cars & I am really enjoying the challenge of these Jeep issues so I now have 2 that need work. Retirement gives me so much more time.
Thank you.
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Always interested in these gearbox issues as I swear that’s what causes my intermittent loss of power when the gearbox warms up. Having the gearbox rebuilt solves the problem for a while. As my gearbox was failing there was a stage that no throttle response in D or R but came back in P or N also after it warmed up. Never any codes or lights. The car did actually select the gear as it could drive forward or back at idle on flat ground
Your other problem, the hpfp is mechanically driven so as drover said check the filter in the M Prop solenoid it is where the fuel goes from low pressure to the high pressure side (on top of the pump), the filter will be either missing (destroyed) or choked with fine metal shavings from the roller follower chewing out the cam as it has turned 90 degrees
I have been meaning to look at the other thread where the TCM was suspected but it hasn’t been updated, might give it a nudge although he was getting a tc clutch slipping code even though it wasn’t slipping
Bob
PS my handbook (original) says not to idle the Diesel engine longer than ten minutes as it cools down too much and can varnish the bore, oh and originally my gearbox ran at 68 deg C then when the dealer serviced it at 40,000 k’s it was increased to 80 deg C