ECM Ground Circuits
ECM is located underneath top of passenger-side carpet (behind glove box) and is mounted to floor panel. Measure resistance between engine (ground) and specified terminals at ECM connector. See the ECM GROUND CIRCUITS table. If resistance is more than 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 |
ECM Terminals No. (Wire Color) |
| GS300 |
"B" |
69 (Brown) |
| GS300 |
"B" |
78, 79 & 80 (White/Black) |