Engine Control Module (ECM)
The ECM consists of a microcomputer, inspection lights (except Quest), diagnostic mode selector, connectors and wiring for voltage signal input, voltage signal output, and power supply. The unit is not serviceable and should not be opened. Inspection lights are provided on side of unit for self-diagnostic checks. The ECM contains memory and logic circuits, enabling it to interpret sensor inputs and control various engine systems. To locate ECM, see ECM LOCATIONS table.
ECM LOCATIONS
| Application | Location |
|---|---|
| Altima | Under Center Console |
| Maxima, NX & Sentra | Behind Center Console |
| Pathfinder & Pickup | Under Passenger Seat |
| Quest | Behind Center Instrument Panel |
| 240SX | Behind Passenger-Side Kick Panel |
| 300ZX | Behind Glove Box |
NOTE:
Components are grouped into 2 categories. The first category is INPUT DEVICES, which are components that control or produce voltage signals monitored by the ECM. The second category is OUTPUT SIGNALS, which are components controlled by the ECM.