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Ground Circuits

  1. Turn ignition off. Using DVOM, touch negative lead to ground. Using positive lead, backprobe each control unit ground terminal. See CONTROL UNIT GROUND TERMINAL IDENTIFICATION  table. Resistance should be zero ohms. If resistance is not zero ohms, repair open to ground.
  2. Using DVOM, touch negative lead of voltmeter to a good ground. Touch positive lead of voltmeter to each ground terminal. With engine running, voltmeter should indicate less than one volt. If voltmeter reading is greater than one volt, check for open, corrosion or loose connection on ground lead.
CONTROL UNIT GROUND TERMINAL IDENTIFICATION

Application Wire Color
Justy
Carbureted
Terminal No. 12 Black/Red
Terminal No. 16 Black
Terminal No. 17 Black
PFI
Terminal No. 1 Black/Red
Terminal No. 1 Black/Green
Terminal No. 2 Black/Green
Terminal No. 10 Black/Red
Terminal No. 13 Black/Blue
Terminal No. 26 Black/Blue
Legacy
Terminal No. 11 Black/Red
Terminal No. 14 Black/White
Terminal No. 15 Black
Terminal No. 22 Black/Red
Terminal No. 24 Black/Yellow
Terminal No. 25 Black/Yellow
Loyale
Terminal No. 9 Black
Terminal No. 30 Black/Red
Terminal No. 35 Black
Terminal No. 42 Black/Red
Terminal No. 44 Black/Red
Terminal No. 50 Black/Yellow
Terminal No. 51 Black
SVX
Terminal No. 5 Black/Red
Terminal No. 11 Black/Red
Terminal No. 14 Black/White
Terminal No. 22 Black
Terminal No. 24 Blue/Black
Terminal No. 25 Black/Yellow