This CAT C15 electrical schematic provides the complete wiring diagram and connector pinout tables for the Caterpillar C15 on-highway engine electrical system. Published as SENR9697-01 (August 2005), the two-page document covers ECM connector details, sensor wiring, injector circuits, intake valve actuation, and a full diagnostic trouble code (PID-FMI) reference list.
Official CAT C15 electrical schematic document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 On-Highway Engine (BXS1-UP) |
| System / Group | Electrical System — 3126B & 3126E / Manuals |
| Publication no. | SENR9697-01 |
| Year / Revision | August 2005 |
| Pages | 2 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- Right Side View — sensor and solenoid locations (engine coolant temperature sensor, boost pressure sensor, primary and secondary engine speed/timing sensors, timing calibration probe connector, atmospheric pressure sensor, engine oil pressure sensor, intake manifold air temperature sensor, fuel temperature sensor)
- Left Side View — ECM, valve cover connectors (P681 front, P682 rear), intake valve actuation pressure sensor and solenoid, engine coolant diverter solenoid
- ECM Connector P2 (70-pin) — full pinout with wire color, gauge, circuit name, and terminal part numbers
- Sensor and solenoid connector tables — P100, P103, P105, P200, P400, P401, P402, P531, P540, J201, J203, J227
- Valve cover connector tables — P681 (12-pin front), P682 (rear) with injector and intake valve actuator wiring for cylinders 1–6
- Harness and wire symbol legend — wire identification, connector symbols, ground connections
- Connector and splice locations for harnesses 229-7366-02, 229-7365-03, and 241-3150-01
- PID-FMI diagnostic trouble code reference — injector faults, sensor voltage faults, intake valve actuator codes, retarder solenoid codes, coolant level and temperature warnings, flash code cross-reference
- Vehicle interface wiring — accelerator pedal sensor, vehicle speed sensor, cruise control, service brake switch, clutch switch, J1939 datalink, tachometer, warning and check engine lamps
Applicable truck models
This CAT C15 electrical schematic applies to Caterpillar C15 on-highway engines with serial prefix BXS1-UP. These engines are commonly installed in Class 8 trucks from multiple OEMs. The document references ACERT-era intake valve actuation components and engine retarder solenoids specific to this engine family. For additional technical resources, visit Caterpillar Support.
Who needs this CAT C15 electrical schematic manual
Diesel technicians and fleet workshop owners troubleshooting sensor failures, injector wiring faults, or diagnostic codes on C15-powered trucks will find this document essential. The detailed 70-pin ECM pinout and PID-FMI code list streamline fault isolation without needing Cat ET software on hand.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
Applies to these truck models
This is the manufacturer document shared across 2 model families. It applies to:
- CAT – C15 On-Highway Schematic – 003255
- CAT Add On Files
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