Alright, tomorrow will be the day for first start.

My replacement C4 Star DAS system showed up on Wednesday and I am finishing up the small amount of wiring today.

The engine I used was removed from a 2000 ML55 AMG, the harness and ECU for this engine are ME2.7, whereas the XF is ME2.8. The harnesses and ECU's are not compatible with each other.

I purchased the engine harness from a 2003 CL500. The benefits to using this harness is that it is a ME2.8 harness and shares identical ECU connectors and pinouts.

The very small downside to the harness was that I also had to upgrade to an ME2.8 throttle body and it has a body connector that does not match the XF.

Pictured below are the differences in the connectors, the upside is that it is a simple cut and solder operation though as the wiring colors match.

The wires are as follows....

On the smaller 4 pin RCM connector

Red with White Stripe (fat wire) is power for the Air Injection Pump
Red with Green Stripe is power for both of the Upstream O2 sensor heaters
Red with Blue Stripe is power to all of the Fuel Injectors
Gray with Blue Stripe is the Air Pump Relay Control wire. This wire jumps from this connector to the larger connector below. You can see how it runs from one to the other in the pictures below.

On the larger 5 pin Body connector

Gray with Blue Stripe is jumper wire mentioned above
Black with Yellow Stripe is power to all of the Coil Packs
Purple wire energizes the Starter Solenoid
Blue with White Stripe is the Low Battery Warning and runs to the Alternator
Blue with Green Stripe is power to the AC Compressor Clutch

It really doesn't get any easier. If anyone is considering a V8 swap..... use the same harness I did.

Jared


Connectors on the CL500 Harness

Gray/Blue wire jumps between XF connectors

XF Body Connector

XF RCM Connector