HDSCS 18-Pin 1.5mm ECU / Urea Pump Waterproof Connector – OEM 3-1563759-1 / 3-1564526-1 / 1670865-1
Direct OEM-specification replacement for the TE Connectivity HDSCS (Heavy-Duty Sealed Connector System) 18-pin waterproof wire harness connector used on ECU (engine control unit) and urea (DEF — Diesel Exhaust Fluid) pump circuits on heavy-duty trucks and commercial vehicles. Cross-references TE Connectivity OEM part numbers 3-1563759-1, 3-1564526-1, 1670865-1, and 1670866-1. Uses the 1.5mm contact series in black and green nylon housing with waterproof sealing — the HDSCS series is the industry-standard connector family for heavy-duty truck ECU and emissions system harnesses.
The 18-pin HDSCS connector is used on two critical systems on heavy-duty trucks. As an ECU connector, it carries multiple engine management signals on a single high-density connector — a failed connection causes ECU communication faults, engine derate, or no-start conditions. As a urea (DEF) pump connector, a failed connection disables the SCR (Selective Catalytic Reduction) system, triggering DEF system fault codes and causing the engine to derate to comply with emissions regulations. The HDSCS connector is also used in agricultural and construction equipment ECU harnesses.
| OEM Number | Type | Application |
|---|---|---|
| 3-1563759-1 | Female (socket) housing | TE HDSCS 18-pin female — harness side |
| 3-1564526-1 | Male (plug) housing | TE HDSCS 18-pin male — ECU/component side |
| 1670865-1 | Female housing (alternate) | TE HDSCS 18-pin alternate female |
| 1670866-1 | Male housing (alternate) | TE HDSCS 18-pin alternate male |
| Attribute | Detail |
|---|---|
| Pin Count | 18-Pin |
| Contact Series | 1.5mm pitch (TE HDSCS series) |
| Housing Material | Nylon, black and green |
| Sealing | Waterproof (heavy-duty sealed) |
| OEM Part Numbers | 3-1563759-1 / 3-1564526-1 / 1670865-1 / 1670866-1 |
| Applications | ECU harness, urea (DEF) pump, SCR system, agricultural/construction equipment ECU |
| Terminal Included | Yes |
Q: My truck has a DEF system fault and the engine is derated — could it be the urea pump connector?
A: Yes. A corroded or open 18-pin HDSCS urea pump connector is a common cause of DEF system faults on Euro IV–VI heavy-duty trucks. Inspect the connector before replacing the urea pump or DEF module.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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