hi, i have just put a d16a9 out of a crx in my rover 216 gsi which did have a d16z2 in it. its all in and works but i have this fault code on the ecu (the ecu is out of the crx) the little led flashes 11 times then a space and another 11 time and the engine management light stays on.

i have found this but it doesn't mean anything to me.

Fault 11

IMA Sensor (Idle mixture adjust)
Honda say Defective circuit or unplugged / defective sensor.
Implications Probably substitution of fixed value if input is not within range.
Comment Sometimes known as the CO Pot. This is fitted to OBD-0 ECU's in some vehicles that do run an lambda sensor. This only applies to some some markets, like the UK where fitting of a catalytic converter was not law until 1991. The input is simply a potentiometer that is used to trim the base fuelling - hence the name CO pot.

also this

Q. I'm aware the ECU i have was pre cat, just wondered what the Idle Mixture Adjustor was for as its not directly connected to the ECU.

A. This adjustor is known as the CO pot in the Honda manuals, and the PGMfi system shows errors with this as a code 11. Its used to adjust the CO level at idle etc to ensure the emissions are clean. This is mainly useful for MOT time if your CO levels are too high, but that's about all, a lambda sensor is far better.

It does indeed trace back through the wiring loom to the ECU though.


the d16z2 that was in my 216 had a CAT and a o2 sensor in the exhaust. the new d16a9 didn't have a CAT or o2 sensor.

can any one tel me what i need to do to clear the fault?

Cheers,
Nick