This CAT 3126 wiring schematic provides complete engine and vehicle electrical circuit diagrams for the Caterpillar 3126B and 3126E on-highway diesel engines. Published as RENR1368-05 (September 2005), the two-page document details every sensor, actuator, connector, and wire circuit tied to the Engine Control Module (ECM).
Official CAT 3126 wiring schematic document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3126B & 3126E On-highway Engines |
| System / Group | Electrical System — Wiring |
| Publication no. | RENR1368-05 |
| Year / Revision | September 2005 |
| Pages | 2 |
| File size | 1.9 MB |
| Format | |
| Language | English |
Document table of contents
- 3126B & 3126E Engine Electrical Schematic (Page 1) — engine-side sensors, HEUI injectors, IAPCV, speed/timing sensors, engine harness connector P2/J2
- 3126B & 3126E OEM Vehicle Electrical Schematic (Page 2) — vehicle harness connector P1/J1, cab diagnostic connector, cruise control, PTO, exhaust brake, speedometer, tachometer, data links J1587 and J1939
- Diagnostic Code Listing — full PID-FMI table with flash codes
- ECM Connector Pin-Out Reference — P1 and P2 connector pin assignments with wire colors and circuit names
- Connector Identification — DT, HD, 150 Series, and IAPCV connector plug and receptacle illustrations
Applicable truck models
This document applies to Caterpillar 3126B and 3126E on-highway engines with the following serial number prefixes: BKD1-UP, G3E1-UP, 1AJ1-UP, 8YL1-UP, CKM1-UP, CRP1-UP, 7AS1-UP, 8SZ1-UP, and 9SZ1-UP. These engines were installed in medium-duty trucks from multiple OEMs. The schematic references related Caterpillar service literature including RENR1367 (Troubleshooting) and RENR1271 (Systems Operation / Testing and Adjusting). For current parts and service support, visit Caterpillar Support.
Who needs this CAT 3126 wiring schematic manual
Fleet mechanics and workshop technicians diagnosing electrical faults on 3126B or 3126E engines will find every wire color code, ECM pin number, and diagnostic flash code in this reference. It is essential for tracing circuits related to HEUI injectors, the Injection Actuation Pressure Control Valve, camshaft speed/timing sensors, coolant temperature, oil pressure, boost pressure, and vehicle interface wiring such as cruise control, PTO, exhaust brake, and data link connections.
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