Scania 3-Pin ECU & Controller Module Connector – TE 1-968977-9 / 2-968977-9 / 3-968977-9
Direct OEM-specification replacement for the Scania 3-pin connector used on ECU (Engine Control Unit) and controller module harnesses. Cross-references TE Connectivity part numbers 1-968977-9, 2-968977-9, 3-968977-9 (female/socket variants) and 1-968976-9, 2-968976-9, 3-968976-9 (male/plug variants). The numeric prefix (1, 2, 3) denotes the keying variant, preventing mismating between different ECU connectors in the same harness. Used across Scania R, S, P, and G series trucks. Available bare or with pre-wired leads.
Scania uses a keying system on multi-pin ECU connectors to prevent mismating in the dense harness environment of a truck cab and engine bay. The numeric prefix (1, 2, 3) in the part number denotes the keying position:
| Part Number Prefix | Keying Position | Application |
|---|---|---|
| 1-968977-9 / 1-968976-9 | Key position 1 | ECU connector — position A in harness |
| 2-968977-9 / 2-968976-9 | Key position 2 | ECU connector — position B in harness |
| 3-968977-9 / 3-968976-9 | Key position 3 | ECU connector — position C in harness |
| Pin | Function | Failure Symptom if Corroded |
|---|---|---|
| 1 | ECU power supply (+24V on Scania trucks) or signal reference | ECU module inactive, no communication with SDP3 scan tool |
| 2 | Signal output or CAN bus line | U-code logged, module communication fault |
| 3 | Ground / module earth return | Intermittent ECU faults, erratic module behaviour |
| Attribute | Detail |
|---|---|
| Pin Count | 3-Pin |
| Part Numbers | 1-968977-9 / 2-968977-9 / 3-968977-9 (female); 1-968976-9 / 2-968976-9 / 3-968976-9 (male) |
| Manufacturer | TE Connectivity |
| Housing Material | High-temp nylon (PA66), waterproof sealed |
| Wire Option | Bare connector / pre-wired leads |
| Application | Scania ECU harness, controller module harness |
| Compatible Models | Scania R series, S series, P series, G series |
Q: My Scania SDP3 scan tool cannot communicate with the ECU — is it the connector?
A: Loss of SDP3 communication with the Scania ECU is frequently caused by a corroded 3-pin ECU connector rather than a failed ECU. A corroded CAN bus pin (Pin 2) or ground pin (Pin 3) causes the ECU to lose its communication interface. Inspect the connector before replacing the ECU, which requires Scania dealer programming.
Q: How do I identify which keying variant (1, 2, or 3) I need?
A: The keying variant is physically visible on the connector housing as a tab or slot in a specific position. Compare the keying position of your existing connector with the three variants. The correct variant will mate smoothly — the incorrect variant will not engage.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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3 Pin Connectors
