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Old 11-14-2014, 10:59 PM   #13
satlite440
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Join Date: Jul 2011
Location: kent wa
Posts: 1,053

2001 SL2
Default Re: Transmission Slipping

starting in 07 the abs was integrated into the tcm&ecm(transmission control module&engine control module) as an enhancement to the stability system..the ecm or the abs module can send a tourqe request via calss 2 or can or gm high speed lan depending on the communications arcatecture.. to increase or decrease delivered output tourqe from the transmission to help with the abs pulsewidth modulation of individual wheel calipers to prevent positive wheel slip(loss of traction) and stop the 1 wheel wonder effect in dumb axles or transaxles(not having a dedicated control module..most08 and newer vehicals are equipped with rear cluch modules) a wheel speed sensor or the p1811 is the most common issues on u vans...the abs harness usualy has an internal break where it goes over the lca(lower control arm) and flexes up to the hub bearing connecter or where it goes up from the subframe clips up to the body...a hub bearing can be loose and not set a dtc or can set a dtc and not be loose...diagnosticly if you have acess to a scan tool or code reader than can access the data look at all the wheel speeds at one time in the metric scale as it is finer then mph...I have had bad hubs that read ok in mph and would have intermitant failure to quickly to catch in a live plot on the tech2 but showed up and were easyer to see when in the kpm sacle....



as for the line pressure solenoid not to bad to do...

hth

...
shure you can trust the government,just ask us indians all about it...

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