The heating element is located within the O2 sensor. The cable that is connected to the sensor contains 4 wires; two for the sensor itself, and two for the heater.

The O2 sensor in this car only has one wire. However, thanks to this forum (but mostly Frank Reiner) I fixed the problem. I thought about how the circuitry worked, and realized there was no power to the fuel pump. Looking at the circuit board, I saw the problem. Pin #87 goes to the body of the large relay. I noticed a little burn spot, and a crack in the solder joint. Photo shows the crack and burned spot at the screwdriver tip:

I soldered the connection, plugged in the relay, and it started right up!
Thanks again for the help, I could not have fixed it without it.....Rich

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All Diesel Fleet
1985 R107 300SLD TURBODIESEL
2005 E320 CDI (daily)

LOTS of parts for sale!


EGR block kit
http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html

1985 CA emissions 617 owners- You Need This!
Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst.

Sanden Instalation Guide (post 11):
http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html