Bad throttle body and/or replace/repair?
 

My 1994 E320 w124 wagon is having these issues: After starting the engine, I am getting low idling so low it kills the engine. Troubleshooting on the DM Self Test Diagnostic Module (16 pin) indicated a code 6 meaning Idle speed control faulty. That is the only code showing using the DM.

When I use the code reader to retrieve the codes on the individual pins, the code reader shown these results:

Pin 6, code 9, SRS malfunction indicator lamp (A1e15) or time limit for DTC readout /erasing e

Pin 8, code 8: Idle speed control (ISC) system at upper or lower control stop or CC or EA indicates "limp home" mode

Pin 8, code 13: O2S (Lambda) control system operating at rich or lean limit

Pin 14, code 2: EA/CC/ISC control module (N4/1) or Safety contact switch (M16/1s1) or Stop lamp switch or Cruise control switch or Actual value potentiometer or Starter lock-out/back-up lamp switch or engine speed signal or vehicle speed signal or closed throttle position switch or safety relay in EA/CC/ISC control module.

In addition, my cruise control does not work, either.

I replaced the brake stop light that goes under the brake pedal with a new one and still have the same issues.

I checked the wire harness with the white pigtail behind the battery and it shows the date with the DELPHI 20.04.05. I assumed the wire harness is good. However, I don't see any pigtail on the throttle body harness. I did noticed the green bar code like label with numbers that are not clearly seen due to age. I am assuming that the throttle body is NON ASR because there is no yellow triangle on in the top middle of the instrument cluster panel. I believe the part number of the throttle body is Throttle Housing with Cruise Control Actuator
Part #: 000-141-57-25- without acceleration skid control (ASR).

I am not sure where to start to resolving these issues mentioned above. Any comments/feedback is greatly appreciated.

For anyone else dealing with this. Restore your Mercedes.com appears to rebuild these throttle bodies. I’m having similar trouble with my early ‘96 E320

Has the engine wiring harness and throttle body wiring been replaced? Many mechanics won't touch this model for driveablility issues unless both have been replaced.