I've got a CL600 from 2001 with the NA engine.
I've been fixing a bunch of issues recently to get it back on the road since I abandoned it on my parents drive for 3 years.
However, I currently have an issue were it doesn't use the left bank of cylinders (7-12) at all. It's down on power, the exhaust is cold and I can see in the Autel that the O2 sensors, fuel injectors and camshaft sensor are all in a sort of off state. There are no DTC trouble codes in the computer at all. (well apart from a Distronic error). I've been struggling to work this out. The car behaves as if CSO (cylinder deactivation) is active and all is well in the world, like that's how it intended. No amount of throttle or changes to other inputs get the left bank to start.
Today a friend mentioned the right signal acquisition module that sits next to the ECU. I replaced this module with a used one from eBay because my fuse box was corroded to hell and some of the SAM pins also were. Everything else controlled by that SAM works well so I never thought to check if it needs coding. However I am now told that it does - although I got the identical part number (A0315451732), the software is specific to the car its installed into from new?
So here's the question, could a mismatched right SAM unit cause my left bank of cylinders not to fire?
Or do you have any other ideas as to what could cause this?
I'm thinking that the ECU might be commanding that side on, but if the SAM came from a v8 say, that signal might to get to the left bank, and so the default state might be off rather than on? As far as I can see in WIS there are no dedicated fuses or relays for CSO in that fuse box. Only the ECU dedicated ones.
I can get it coded, but only at a MB stealer for the princely sum of £260 for the 30 minutes it will take, so I am reluctant to do that on a gamble because at the moment everything else works.
I can't correlate the failure of the left bank to the SAM change or any other meaningful event purely in time, because the car was not being used. It's sat for 3 years and last time I parked it I had a bunch of errors, one being some misfire codes that I didn't want to get into 3 years ago.
Here's a pic of it squeezed into my back yard. Soooo dirty!
I've been fixing a bunch of issues recently to get it back on the road since I abandoned it on my parents drive for 3 years.
However, I currently have an issue were it doesn't use the left bank of cylinders (7-12) at all. It's down on power, the exhaust is cold and I can see in the Autel that the O2 sensors, fuel injectors and camshaft sensor are all in a sort of off state. There are no DTC trouble codes in the computer at all. (well apart from a Distronic error). I've been struggling to work this out. The car behaves as if CSO (cylinder deactivation) is active and all is well in the world, like that's how it intended. No amount of throttle or changes to other inputs get the left bank to start.
Today a friend mentioned the right signal acquisition module that sits next to the ECU. I replaced this module with a used one from eBay because my fuse box was corroded to hell and some of the SAM pins also were. Everything else controlled by that SAM works well so I never thought to check if it needs coding. However I am now told that it does - although I got the identical part number (A0315451732), the software is specific to the car its installed into from new?
So here's the question, could a mismatched right SAM unit cause my left bank of cylinders not to fire?
Or do you have any other ideas as to what could cause this?
I'm thinking that the ECU might be commanding that side on, but if the SAM came from a v8 say, that signal might to get to the left bank, and so the default state might be off rather than on? As far as I can see in WIS there are no dedicated fuses or relays for CSO in that fuse box. Only the ECU dedicated ones.
I can get it coded, but only at a MB stealer for the princely sum of £260 for the 30 minutes it will take, so I am reluctant to do that on a gamble because at the moment everything else works.
I can't correlate the failure of the left bank to the SAM change or any other meaningful event purely in time, because the car was not being used. It's sat for 3 years and last time I parked it I had a bunch of errors, one being some misfire codes that I didn't want to get into 3 years ago.
Here's a pic of it squeezed into my back yard. Soooo dirty!
lol. Tomorrow I’ll continue going through all the wires to see if I can find more corrosion anywhere and report back.
