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.
ECM Connector Identification
On Defender 90 and Discovery, ECM is located in the right rear corner of the engine compartment. Each vehicle has 3 ECM connectors. A Black 36-pin connector, a Red 36-pin connector and a Black 18-pin connector. See Fig 1 and Fig 2 . See ECM CONNECTOR IDENTIFICATION table.
| Connector Description | (1) Identification Number | |||
|---|---|---|---|---|
| Defender | ||||
| Black 36-Pin | C634 | |||
| Black 18-Pin | C635 | |||
| Red 36-Pin | C636 | |||
| Discovery | ||||
| Black 36-Pin | C1032 | |||
| Black 18-Pin | C1033 | |||
| Red 36-Pin | C1017 | |||
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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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