ECU Trouble code 43

[Bibs]

43 - Electronic Spark Control (ESC) Circuit

Any ideas what causes this and how to fix it? My searching of the net points to this being a signal from the 'knock sensor' which picks up engine vibrations usually associated with pinking but might be something else... any clues guys?

[Mark Blanchard]

Didn't know the N/A had an ECU.

[s4simon]

The Bible says:

********

The ECM performs two tests on this circuit to determine if it is operating correctly. If either of the tests fail, a code 43 will be set.

* If there is an indication of knock for 3.67 seconds over a 3.9 second interval with the engine running.

* If ECM terminal 'J1A11' voltage is either above about 3.75 volts (indicating open CKT 37U), or below about 1.25 volts (indicating CKT 37U is shorted to ground) for 5 seconds or more.

********

It says to - Check CKT 37U at the ECM connector.

Do you have a copy of the Electronic MPFI Chargecooler Manual ???

Do you need a copy of the Code 43 Fault finding pages ??

[Bibs]

That would be superb please

[s4simon]

Emails Away !!!

Check your in boxe(s).

Hope you've got broadband

[Bibs]

Thanks to tinywillyuk Simon for the replacement knock sensor which is now fitted and the fault code cleared

Thank you.

[Vulcan Grey]

This just happened to me today on the way to work.

Used freescan to see the code and that the knock was at only 6 and not climbing.

Looked at the connector and measured it at 4K to ground, so it wasn't shorted.

Bought a replacement knock sensor Borg Warner S8009 at the local autoparts store for $32.

That knock sensor is out of a 1990 Buick Century btw.