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Check dark blue/white wire from knock sensor to ecm(electronic computer module)

if it is grounded or shorted to ground then code 43(electronic spark control circuit) will be set

Warm car to normal temperature.shut off engine.disconnect knock sensor.turn ignition switch to on position or run position(engine is not running)

check voltage between harness and ground(should be between 4 to 6 volts)

yes-means bad connector or bad sensor

over 6 volts-shorted to voltage or bad ecm

under 4 volts-shorted to ground or bad ecm

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โˆ™ 2011-09-13 12:29:32
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Q: On a 1988 Pontiac Bonneville will a bad knock sensor give a code 43 and cause the engine to run rough stall when you slow down?
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