Code 43

[fsahm]

SHOP MANUAL ??

CODES:
https://www.docstoc.com/docs/27838665/19...-ECM-Codes

There is an entire diagnostic procedure for this error. The knock sensor is on the passenger side of the block. Do a quick check and make sure the wire isn't damaged or broken. My scanner isn't working so I can't scan in the pages. Here's some information from the diagnostic aides section:

Ceck CKT 496 (dark blue wire to knock sensor) for a potential open or short to ground.

Also check for proper installation of MEMCAL.

If the customer's complaint is the "Service Engine Soon" light comes on when in acceleration, the B portion of the code is failing. There is a possibility that the High Engergy Ignition (HEI) system was in bypass mode when the 43 test was run. An intermittent open in the EST circuit will put the HEI module in bypass which will not allow the spark to be advanced so the 43B test would fail. If the ECM also had a Code 42 stored, then the EST circuit is likely the cause of Code 43.

There are two internal ECM tests run on this CKT to determine it is operating correctly. If either of the tests fail, a Code 43 will be set.

Test 1: If CKT 496 becomes open or shorted to ground, the voltage will either go above 3.62 or bleow 1.44 volts. If either of these conditions are met for approximately 0,5 seconds, Code 43 is set.

Test 2: The system also performs a functional test to determine if the knock sensor is responding to engine detonation. To perform this test, the ECM will advance the spark under certain load conditions and look for a knock signal respone. If knock is detected before the conditions are met to run the test, then the test is bypassed. If the test is run and no knock detected, Code 43 will be set.

Conditions for test: Coolant temp over 203 degrees F
High engine load based on air flow

Gruß
Friedel