Engine Control Unit (Except NAVAJO)
- Locate Engine Control Unit (ECU). See ECU LOCATION table. Connect Engine Signal Monitor (49-9200-162) to ECU. See Fig 1 . Check voltage at each terminal of ECU. If input and output component voltage readings are not as specified, check faulty component. See PIN VOLTAGE CHART S article, TESTS W/CODES - EXCEPT NAVAJO article and testing for appropriate component in this article.
- If input and output component voltages are as specified, and ECU voltage is incorrect, replace ECU.
CAUTION:
DO NOT apply voltage to terminals "A" and "B" of engine signal monitor. See Fig 1
.
ECU LOCATION
| Application | Location |
|---|---|
| B2200, B2600i & 929 | Behind Passenger Front Side Trim Panel |
| Miata & MPV | Under Passenger Front Floor Mat |
| MX-3, Protege & 323 | Behind Driver & Passenger Front Side Walls |
| MX-6 & 626 | Behind Passenger Side Console Cover |