Diagnostic Aids

Check circuit No. 496 for a potential short or open to ground. Also check for proper installation of MEM-CAL. Mechanical engine knock can cause a knock sensor signal. Abnormal engine noise must be corrected before using this chart.

NOTE: Code 43 circuit diagram and flow chart has been updated by Technical Service Bulletin No. 91-6-6, dated 8/24/90.

Fig 1: Code 43, Schematic, ESC Error Without ESC Module

Fig 2: Code 43 Flow Chart, ESC Error Without ESC Module