Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Ford Bronco II RWD, Standard, M5OD-R1FACTORY OEM SERVICE PROCEDURE
Electronic DISTRIBUTORLESS Ignition System (EDIS) Module
- Remove EDIS module connector. Measure resistance between module terminal No. 4 (IGND) and No. 9 (GND). See EDIS MODULE PIN IDENTIFICATION . If resistance is less than 5 ohms go to Step 2. If resistance is more than 5 ohms, replace EDIS module and check for fault codes. See TESTS W/CODES article.
- With key off, check resistance between EDIS module harness connector terminal No. 4 and ECA connector pin No. 16 (IGN GND) of the ECA connector. See Figure . If resistance is less than 5 ohms, replace EDIS module and rerun test. If reading is more than 5 ohms, service open circuit, reconnect ECA and check for fault codes. See TESTS W/CODES article.
EDIS MODULE PIN IDENTIFICATION (1)
| Pin No. | Circuit | ||
|---|---|---|---|
| 1 | PIP | ||
| 2 | IDM | ||
| 3 | SAW | ||
| 4 | IGND | ||
| 5 | VRS - | ||
| 6 | VRS + | ||
| 7 | VRS Shield - | ||
| 8 | VBAT | ||
| 9 | GND | ||
| 10 | Coil 1 | ||
| 11 | Coil 2 | ||
| 12 | Coil 3 | ||
|
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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