- EN
| Parameter | Specification |
|---|---|
| COGENG Part Number | 1078139 |
| OEM Equivalent | Caterpillar 1078139 |
| Product Type | Air Pressure Sensor (Boost / MAP Sensor) |
| Sensor Type | Piezoresistive pressure transducer |
| Output Type | Analog voltage (variable) |
| Application | Intake manifold pressure / Boost pressure monitoring |
| Compatible Engines | Caterpillar C15, 3126B, 3126 |
| Compatible Equipment | Various Caterpillar heavy equipment with C15, 3126B, 3126 engines |
| Brand | Part Number |
|---|---|
| COGENG | 1078139 |
| Caterpillar | 1078139 |
| Interchange | 1078138, 1078140, 1078141, 160-5416, 1605416, 168-0657, 1680657, 193-5027, 1935027 |
| Parameter | Specification |
|---|---|
| Supply Voltage | 5V DC regulated (ECM supplied) |
| Output Signal | 0.5V - 4.5V DC (analog) |
| Output Type | Ratiometric to supply voltage |
| Current Draw | ≤ 10 mA |
| Response Time | < 10 ms |
| Insulation Resistance | ≥100MΩ @ 500V DC |
| Parameter | Specification |
|---|---|
| Pressure Range | 0 - 4 bar (0 - 58 psi) absolute |
| Measurement Type | Absolute pressure (referenced to vacuum) |
| Accuracy | ±2% of full scale |
| Overpressure Limit | 6 bar (87 psi) |
| Burst Pressure | 10 bar (145 psi) |
| Compensated Temperature | -40°C to +125°C |
| Parameter | Specification |
|---|---|
| Connector Type | 3-pin Deutsch / Weatherpack |
| Mounting Thread | 1/8" - 27 NPT |
| Hex Size | 19 mm (3/4") |
| Housing Material | High-strength engineering plastic / brass |
| Sensing Element | Piezoresistive silicon (sealed) |
| Weight | 0.05 kg (0.11 lbs) |
| Overall Length | 55 mm |
| Pin | Function | Signal Type | Wire Color (Typical) |
|---|---|---|---|
| Pin A (1) | Sensor Ground | Ground (0V) | Black / Green |
| Pin B (2) | Sensor Signal | 0.5-4.5V analog | Yellow / White |
| Pin C (3) | Sensor Supply | +5V DC regulated | Red / Orange |
| Parameter | Rating |
|---|---|
| Operating Temperature | -40°C to +125°C (-40°F to +257°F) |
| Storage Temperature | -40°C to +125°C (-40°F to +257°F) |
| Ingress Protection | IP67 (connector mated) |
| Vibration Resistance | 15G @ 50-2000Hz |
| Shock Resistance | 50G |
| Media Compatibility | Air, diesel combustion gases |
| Corrosion Protection | Passivated / coated |
| Pressure (bar) | Pressure (psi) | Output Voltage (V) | Condition |
|---|---|---|---|
| 0 | 0 | 0.5 ±0.1 | Full vacuum (engine off) |
| 0.5 | 7.25 | 1.0 ±0.1 | Low boost |
| 1.0 | 14.5 | 1.5 ±0.1 | Atmospheric (~14.7 psi) |
| 1.5 | 21.75 | 2.0 ±0.1 | Moderate boost |
| 2.0 | 29.0 | 2.5 ±0.1 | Medium boost |
| 2.5 | 36.25 | 3.0 ±0.1 | High boost |
| 3.0 | 43.5 | 3.5 ±0.1 | Maximum boost |
| 4.0 | 58.0 | 4.5 ±0.1 | Over-range |
| Condition | Pressure (bar) | Output Voltage | Notes |
|---|---|---|---|
| Key ON / Engine OFF | ~1.0 bar (ambient) | ~1.5 V | Depends on altitude |
| Idle (no boost) | ~1.0 bar | ~1.5 V | Same as atmospheric |
| Low Load | 1.2-1.5 bar | 1.7-2.0 V | Light acceleration |
| Medium Load | 1.5-2.2 bar | 2.0-2.7 V | Normal operation |
| High Load / Full Boost | 2.2-3.0 bar | 2.7-3.5 V | Under heavy load |
| Overboost | >3.0 bar | >3.5 V | Potential fault condition |
| Engine Model | Displacement | Application |
|---|---|---|
| C15 (ACERT / non-ACERT) | 15.2L (928 cu in) | Heavy trucks, construction equipment, mining |
| C15 (BXS) | 15.2L | On-highway trucks |
| C15 (MXS) | 15.2L | On-highway trucks |
| C15 (NXS) | 15.2L | On-highway trucks |
| Engine Model | Displacement | Application |
|---|---|---|
| 3126B | 7.2L (439 cu in) | Medium trucks, buses, construction equipment |
| 3126B (HEUI) | 7.2L | Hydraulic Electronic Unit Injection |
| Engine Model | Displacement | Application |
|---|---|---|
| 3126 | 7.2L (439 cu in) | Medium trucks, buses, construction equipment |
| Equipment Type | Models | Engine |
|---|---|---|
| Heavy Trucks | Various | C15, 3126B, 3126 |
| Excavators | Various large models | C15 |
| Wheel Loaders | 980G, 980H (C15), 950G (3126) | C15, 3126B |
| Motor Graders | 14M, 16M (C15) | C15 |
| Caterpillar Generators | Various | C15, 3126B |
Note: This sensor is specifically designed for CAT C15, 3126B, and 3126 engines. Verify compatibility with your engine serial number and ECU configuration before ordering. Contact COGENG with your machine details for exact application verification.
| Component | Function |
|---|---|
| Sensor Element | Piezoresistive silicon diaphragm (pressure changes resistance) |
| Signal Conditioning | Internal circuitry converts resistance to voltage |
| ECM Interface | ECM supplies 5V reference and reads voltage signal |
| Engine Management | ECM uses pressure data for fuel rate, timing, and derate protection |
| Parameter | Typical Value (3126B) | Typical Value (C15) |
|---|---|---|
| Maximum Boost | 25-30 psi (1.7-2.1 bar) | 35-45 psi (2.4-3.1 bar) |
| Atmospheric Reference | Absolute sensor (includes barometric) | Absolute sensor (includes barometric) |
| Derate Pressure | >OEM spec (derate) | >OEM spec (derate) |
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