This CAT C10 C12 C15 C16 on-highway schematic is a 2-page wiring diagram reference covering the complete electronic engine control circuits for Caterpillar C-10, C-12, C-15, C-16, and 3406E on-highway diesel engines. It includes connector pinouts, sensor locations, injector harness wiring, diagnostic fault code listings with PID-FMI values and flash codes, and harness part number cross-references.
Official CAT C10 C12 C15 C16 schematic document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-10, C-12, C-15, C-16, 3406E On-Highway Engines |
| System/Group | Electronic Engine Control — Wiring Schematic |
| Publication no. | RENR2237-07 |
| Year/Revision | © 2007 Caterpillar |
| Pages | 2 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- Diagnostic Code Listing — full PID-FMI table with flash codes (cylinder faults, sensor open/short circuits, data link faults, warning codes)
- C-10 and C-12 Left Side View / Front Right Side View / Front Top View — sensor and connector locations
- C-15 and C-16 Left Side View / Front Top View — sensor and connector locations
- 3406E Left Side View / Right Side View / Front View — sensor and connector locations
- Connector and Splice Locations for Harness — part numbers for C-10/C-12, C-15/C-16, 3406E engine and injector harnesses
- Harness and Wire Symbols legend — pin, socket, fuse, wire color, gauge, connector reference designator
- ECM Connector J1/P1 and J2/P2 Pin Assignments — all 70 pins with circuit descriptions
- Primary and Secondary Engine Speed/Timing Sensor circuits (crankshaft and camshaft position)
- Engine Coolant Temperature, Oil Pressure, Boost Pressure, Atmospheric Pressure, Fuel Temperature sensor wiring
- Injector Harness wiring — cylinders 1 through 6
- Starting circuit, key switch, battery, and alternator connections
- Engine Retarder Solenoid circuits (Lo/Hi, Med/Hi)
- Air Inlet Shutoff Solenoid and Relay wiring (optional, harness 197-9635 for C-10/C-12)
- J1587 and J1939 Data Link connections and 9-pin diagnostic connector
- Related Electrical Service Manuals list — RENR2238, RENR2235, RENR2307, SENR5017
- Notes A through Z — optional equipment, twisted pair specifications, diagnostic connector details
Applicable truck models
This schematic applies to Caterpillar 3406E, C-10, C-12, C-15, and C-16 on-highway engines with serial number prefixes CPD1-UP, EGH1-UP, 1MM1-UP, 2KS1-UP, and 2WS1-UP. These engines are found in Class 8 highway trucks from multiple OEMs. Related troubleshooting and systems operation manuals include RENR2238 (Troubleshooting, All), RENR2235 (C-10/C-12 Systems Operation), RENR2307 (C-15/C-16 Systems Operation), and SENR5017 (3406E Systems Operation). For official Caterpillar parts and service information, visit Caterpillar Support.
Who needs this CAT C10 C12 C15 C16 schematic manual
Diesel mechanics and workshop owners troubleshooting ECM wiring faults, sensor circuits, injector harness issues, or data link communication problems on Caterpillar on-highway engines will find this schematic essential. The diagnostic code listing with flash codes enables rapid fault identification without proprietary software.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
Applies to these truck models
This is the manufacturer document shared across 2 model families. It applies to:
- CAT – C10, C12, C15 & C16 On-Highway Schematic
- CAT Schematics
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