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Code 43, Electronic Spark Control: Notes

WARNING: This page is about a different car, the 1990 Pontiac Sunbird. However, it is still accessible from the selected car via links, so may be relevant.

Code 43 indicates the ECM has seen high or low voltage at circuit No. 496 for longer than 5 seconds with the engine running.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. If conditions for test as described above are being met, Code 43 will currently set and the "SES" light will be illuminated.
  2. The ECM has a 5-volt pull-up resistor, which should be present at the knock sensor terminal.
  3. This test determines if internal resistance of knock sensor is within an acceptable range.
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