I'm trying to confirm DTC diagnosis on a 1992 400E. Driving the car up and a 1/4 mile section of road I got the ASR light on 3 times in about 10 minutes (from initial start so engine was cold initally and never got real hot). Codes were - pin 6 code 30 and pin 7 code 3 (38 pin X11/4) all codes could be reset. I replaced the FI harness (which was all cracked) this was the first drive since replacing the harness. Previous codes (prior to FI harness replacement) were;

4 - none
6 - 13, 17, 30
7 - 3, 5, 14
8 - 6, 9, 17
16 - none
17 - none
30 - 3, 8
No Idea when the last time codes were read or reset from the previous owner.

On reading the codes there was a high pitched whine in the engine compartment with the ignition in the on position (climate control off). I believe it was from the area of the ETA but I cant be certain. I'll remove the air cleaner tonight and see if I can isolate the noise. A coworkers 92 400E makes no noise with the ignition in the on position. All 3 times it went into limp home mode I was stationary with my foot on the brake. I was hoping for a brake switch code but thats not what it looks like.

From when I replaced the FI harness I noted that the bottom of the throtle plate was dirty. Could a build up of stuff in this location cause this symptom? I figure I'll pull the air mass sensor and then clean the accessable mechanical parts of the throttle actuator.

I want to do a thorough diagnosis befor throwing money at parts. Plus I'm waiting till it eventually gets to 60deg here so I can fix the small rust spots befor I put the car on the road. Taking my time to fully sort it out is OK, I have other cars to drive in the meantime.

Thanks for any help
Paul
84 300SD
92 400E