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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 Type |
ECM Connector |
ECM Terminals No. (Wire Color) |
| GS300 |
"B" |
4 & 69 ( Brown) |
| " |
"B" |
79 & 80 ( White/Black) |