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Home >> GMC >> 1993 >> Forward Control 7.4 N >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Tests W/Codes - V6 >> Self-Diagnostic Tests >> Code 43, Electronic Spark Control 4.3L "S" & "T" Series With M/T & "L" & "M" Series With 4.3L CPI >> Diagnostic Aids

Diagnostic Aids

VCM applies and monitors a 5-volt DC signal to knock sensors. Internal knock sensor circuitry pulls this DC signal down to about 2.5 volts. When knock sensor detects detonation, it generates an AC signal which rides back on DC signal to VCM. Knock signal intensity is dependent upon knock signal level.

Fig 1: CODE 43, Schematic, ESC (4.3L S & T Series W/ M/T & L & M Series W/ 4.3L CPI)
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Fig 2: CODE 43, Flowchart, ESC (4.3L S & T Series W/ M/T & L & M Series W/ 4.3L CPI)
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