Join Date: May 2016
Vehicle: 1996 SLK 230 Non-Runner
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carsoft v7.4 fault codes before and after battery change
Update: my carsoft v7.4 arrived from China and thankfully worked fine connected via the rs-232 serial port on an old Dell Laptop running XP pro with the anti virus switched off.
No fault codes for anything transmission related but did have the following:
B1041 CAN Communication Error with Traction Control Unit - verify the cable connection between the instrument cluster and traction control unit
2 SRS Malfunction Indicator Lamp (Ale15) - check cable, connections and operation of the lamp
27 Front passenger occupied childseat Recognistion Sensor (B48) - cable communication error - check voltage supply at connections + check continuity of cables
3 Voltage Supply Low Terminal 15R
VD (Vario Roof):
B1010 left front power window switch
B1121 Right front power window switch
B1010 Low Voltage Terminal 30E
B1267 Implausible RPM and VSS status signals
B12670 Trunk Lid open and trunk lid closed limit switch activated simultaneously
B1275 Trunk lid open limit switch
B1278 Hardtop (close) switch
PSE (Pneumatic System Equipment):
B1713, B1221, B1220, B1726 (each one repeated two times) no explanation notes
Knowing a poor battery could cause problems and at least one of the fault codes mentioned low voltage I did nothing until I could change the under-powered battery in the car (500a / 52ah) with a proper type 096 one (760a / 70ah).
Before connecting the new battery I checked the K40 module and was pleased to find it looked in really good shape. Connected the new battery, Started Car, Hard Lock Right, Hard Lock Left a few times (to reset any ABS/ESP/BAS lights) then switched off. Then cleared all the existing fault codes.
Then restarted the car and no more SRS light lit up. I cycled the gears a few times before taking a transmission fluid level with my new improved dipstick. The cold reading was off the scale indicating way too much fluid. I drove the car a short way on my driveway in reverse, drive, 2 and 3 (don't think I tried 4). All fine initially then I could detect a little slipping and then eventually no drive. Switched off, left it for a moment then restarted and it drove again back to where I could park up. Read the ATF level again and no change - off the scale. Fluid looks nice and clean (it should be).
During this time I found if I revved the car I would get an awful lot of grey smoke (perhaps not initially after starting the car up). Coolant Level is just above min and looks a nice red/pink colour.
Tried the roof out a few times up/down (with engine on) - worked fine but was slow - took 56 seconds to finish the closing sequence from being stowed in the boot.
Switched off and read the fault codes again . . . this time there were no fault codes except the following =
PSE (Pneumatic System Equipment):
B1713, B1221, B1220, B1726 (each one repeated two times) again no explanation notes.
So then, a few questions . . .
Are those PSE fault codes anything to worry about? anyone know what they are for?
To remove some ATF am I better off draining the pan - measure what comes out and put less back in - gradually taking a reading as I do so . . . or is it better to suck/syphon some out from above? If it has been over-filled should I do anything else? - bearing in mind the previous owner just replaced all the fluid and filter.
Would over-filled ATF cause grey smoke from the exhaust? I read about a vacuum modulator on the transmission (different car so not sure if the SLK 230 has one) that could suck transmission fluid into the engine and get burned up.
Sorry for the long post!