Trans Fail Safe HELP X5 2005 4.8is

[B-M-W]

Seems like everyone is telling you to check your alternator.

Why don't you try that?

[X53Jay4.8is]

Originally Posted by jac

Thanks folks. I had already ordered the MAF and it got here this morning. I installed it and the the transmission light went away and the car shifts smoothly now. So, I cleared the MAF code using my cheap (bavauto SR 300-16) ECU code scanner.

However, after driving the X5 about 1 mile, I got the "Service Engine Soon" light, and reading the ECU yielded:

- O2 Sensor adaptation limit (1-3)
- O2 Sensor adaptation limit (4-6)

So, I drove it about 5 miles more and then the DSC, BRAKE and ABS lights came on.

I had replaced all 4 of the speed sensors about 5 months back, so I doubt it is the sensors.

How could I troubleshoot these two problems (O2 and the speed sensors)?

Yeah too many random non related things popping up. Check the charging system first. start with the easy work to the difficult.

[jac]

Ok, thanks. I thought the alternator was being suggested just for the transmission light diagnosis and since that had been cured by the new MAF...

Anyway, I will now move on to checking the alternator. Thank you for your help.

[jac]

How do you "unlock the cluster" ? I read that it should be unlocked to test the alternator. Is that applicable to a 2001 3.0i without NAV?

[bcredliner]

Originally Posted by jac

How do you "unlock the cluster" ? I read that it should be unlocked to test the alternator. Is that applicable to a 2001 3.0i without NAV?

https://www.youtube.com/watch?v=cO_tBe58ew8

[jac]

@bcredliner: Thanks!

For those with a basic 3.0i model, you can watch this video: https://youtu.be/pn52LmQkBhc

The cluster test functions, according to the description at the bottom of the video are:

1 Car Engine and cluster data
1.0 46nnn Chassis nr/VIN serial number (last 5 digits)
1.1 4nnn K-number
1.2 690236 Cluster Part #
1.3 045210 Coding (04)/diagnosis (52)/bus index (10)
1.4 1200 Week (12)/year of manufacture (2000)
1.5 09_160 Hardware (09) and software # (16.0) of cluster
1.6 Not used
1.7 04__44 CAN-version (04) KI-revision index (44)
2 (test) Cluster System Test - Activates the gauge drivers,
indicators and LEDs to confirm function
3 SI Data
3.0 1098 Used fuel in liters since last SI (Service Inspection)
3.1 0231 Periodic inspection days; elapsed days (since last SI)
4 Momentary Consumption
4.0 0145+ Instant fuel consumption - 0145=14.5 liters/100km
4.1 0018 Instant fuel consumption - 0018=1.8 l/Hour
5 Distance Gone Consumption
5.0 082 Average mileage; 082=8.2 liters/100km
5.1 0536 Calc. km to refuel (momentary distance to go)
6 Fuel Level sensor inputs in liters
6.0 109330+ Fuel level averaged; Left half sensor input=10.9 liters; Right sensor input=33.0 liters
6.1 0439+ Total tank level averaged; vlgs 6.0: 10.9+33.0=43.9 liters
6.2 0442+ Indicated value (44.2) and tank phase
7 Temperature and Speed
7.0 021+ Coolant/Engine temperature (2.1C)
7.1 130 Ambient/Outside temperature - chg met 5 pts. 125/130/135
7.2 + Engine speed / Current RPMs 1/min
7.3 + Vehicle speed / Current Speed in km/hour
8 Input value in HEX form
8.0 1d0+ System voltage ADC-Value Hex code
8.1 26C33C+ ADC Values HG left/HG right
8.2 0000 ADC Value brake degradation sensor (000=o.k.)
8.3 18C ADC Value outside temperature
9 Battery
9.0 140 Battery Voltage - 140 = UB 14.0v
9.1 242013+?
9.2 074_78+?
9.3 0011+?
10 Not used
11 Not used
12 Not used
13 GonG Gong Test
14 Not used
15 Status cluster I/O-ports (bit codes) 0=low; 1=high
1st-belt contact, seat belt fastened=0; 2) ignition lock contact, key inserted=0; 3) door contact, door open=0; 4) clock button pressed=0; 5) SI reset=0, for reset=0; 6) EGS transmission failure=0
Status Digital Outputs (bits) 0=inactive, 1=active
1) Gong output; 2) Brake warning lamp; 3) Low fuel warning lamp; 4) EGA lamp; 5) seat belt lamp; 6) manipulation dot
16 Not used
17 Not used
18 Not used
19 Lock Status; unlocks functions in range 3-18
19.0 L-On/L-Off Unlock: press button when "L-Off"
20 Not used
21 Software Reset; reset OBC settings

[jac]

Ok... I let the car run for like 10 mins while watching the battery voltage. The voltage stayed between 13.8 and 14.1 volts.

I used two different methods to the above: I did it with the cluster test function #9 and I also did it with my OBD-II bluetooth reader w/torque pro software on android. Both reported the same.

So, it looks to me like the battery/alternator are fine and it may have indeed been the MAF that threw that fault. But now I am getting a whole new set of codes (P0172 & P0175) AND the trifecta lights... I will start a separate thread for that so as to not pollute this one further.

Thanks for all your help...