This 17-page CAT C15 03-06 document provides the complete diagnostic procedure for fault code 0003-06 (Cylinder #3 Injector Current High) on C15 On-Highway Truck Engines (MXS configuration). It walks technicians through the Injector Solenoid Circuit Test, wiring inspection, Cylinder Cutout Test, and ECM connector checks to isolate short or open circuit faults in the Electronic Unit Injector (EUI) system.
Official CAT C15 03-06 document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (C15 On-Highway Truck MXS00001-UP) |
| System / Group | Injector Solenoid Circuit — SMCS 1290-038 |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, Updated 25/02/2009 |
| Pages | 17 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0003-06 Cylinder #3 Injector Current High (73) — Conditions Which Generate This Code, System Response
- Injector Solenoid Circuit — Test (covers DTCs 1-05 through 6-06 for all six cylinders)
- System Operation Description — Electronic Unit Injector (EUI) 105-volt pulse operation
- Cylinder Cutout Test — procedure using Caterpillar Electronic Technician (Cat ET)
- Injector Solenoid Test — diagnosing open or short circuit codes with Cat ET
- Test Step 1: Inspect Electrical Connectors and Wiring
- Test Step 3: Check the Variation of the Injectors between Cylinders
- Test Step 5: Check the Harness between the ECM and the Valve Cover Base for an Open Circuit
- Test Step 7: Check the ECM for an Open Circuit (using 257-8718 Adapter Cable / 120-PIN Breakout)
- Check the ECM for a Short Circuit — P2 ECM connector diagnostics
- Return line resistance measurement and final injector replacement steps
Applicable truck models
This guide applies to Caterpillar C15 On-Highway Truck Engines under the MXS serial number prefix (MXS00001-UP). The procedures also reference NKS and RKS configurations within the C15 engine family. The document covers the P2 ECM connector pinout (pins P2-99 through P2-118) and valve cover connectors specific to C15 engines. Schematics and illustrations included identify injector supply and return wiring for all six cylinders. For additional Caterpillar service resources, visit the Caterpillar official support site.
Who needs this CAT C15 03-06 manual
Diesel mechanics and workshop owners diagnosing injector current high or low fault codes (DTCs 1-05 through 6-06) on CAT C15 engines need this reference. It is essential for anyone performing solenoid circuit tests, harness continuity checks, or ECM connector inspections on EUI-equipped C15 trucks, especially when the engine misfires, produces low power, or logs diagnostic code 0003-06.
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