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Code 43, ESC Error Without ESC Module: Notes

NOTE: Test numbers refer to test numbers on diagnostic chart. If an audible knock is heard from the engine at idle, repair the internal engine problems before proceeding.
  1. If tapping on engine does not produce a knock signal on "Scan" tester, try tapping the engine closer to the sensor before proceeding.
  2. The ECM supplies a 5-volt reference signal on the knock sensor line. With knock sensor connected this signal is pulled low to about 2.5 volts. Knock signal, which is an AC signal, rides on this 2.5-volt DC signal.
  3. This test determines if the knock sensor is faulty or if the ESC portion of MEM-CAL is faulty.
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