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ECM Ground Circuits

For ECM location, see COMPONENT LOCATIONS  under INTRODUCTION. Measure resistance between engine (ground) and specified terminals of ECM connector. See ECM GROUND CIRCUITS  table. If resistance exceeds one ohm, repair ground circuit. If resistance is one ohm or less, ground circuit is okay (ECM may be faulty).

ECM GROUND CIRCUITS

Application ECM Connector (1) (1) ECM Pin Nos. (Wire Color)
SC300 "B" 4 & 69 ((2) Brown)
" " 79 & 80 ((2) White/Black)
(1) See Figure for terminal identification.
(2) Attached to right cylinder head.
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