This 17-page CAT C15 03-05 manual provides the complete diagnostic procedure for resolving low and high injector current fault codes on Caterpillar C15 on-highway truck engines (MXS configuration). It covers DTC 0003-05 Cylinder #3 Injector Current Low and directs technicians through the full Injector Solenoid Circuit Test, including open-circuit and short-circuit checks at the ECM, valve cover connectors, and injector harness.
Official CAT C15 03-05 document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (C15 On-Highway Truck MXS00001-UP) |
| System / Group | Electronic Unit Injector (EUI) 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
- 0003-05 Cylinder #3 Injector Current Low (73) — Conditions, System Response
- Injector Solenoid Circuit — Test (System Operation Description)
- Diagnostic codes covered: 1-05 through 6-06 (all six cylinders, low and high current)
- Electronic Unit Injector illustration and C15 engine schematic
- P2 ECM connector pinout and valve cover connector terminal identification
- Test Step 1: Inspect Electrical Connectors and Wiring
- Test Step 3: Check the Variation of the Injectors between Cylinders (Cylinder Cutout Test)
- Test Step 4: Injector Solenoid Test — OK / Open / Short results
- Test Step 5: Check Harness between ECM and Valve Cover Base for Open Circuit
- Test Step 7: Check the ECM for an Open Circuit
- Test Step 8: Check ECM and Harness for a Short Circuit
- Resistance measurement at P2 connector — return line short diagnosis
Applicable truck models
This manual applies to Caterpillar C15 on-highway truck engines with MXS, NKS, or RKS serial number prefixes. The engines use mechanically actuated, electronically controlled Electronic Unit Injectors (EUI) driven by a 105-volt pulse from the ECM. The P2 ECM connector pinout and valve cover connector terminal layout are specific to C15 configurations. Diagnostics require Caterpillar Electronic Technician (Cat ET) software and a 257-8718 Adapter Cable Assembly (120-pin breakout). For official product support, visit Caterpillar Support.
Who needs this CAT C15 03-05 manual
Diesel mechanics and workshop owners diagnosing misfires, low power, or active injector current fault codes on C15-powered trucks need this document. It walks through every electrical test from connector inspection to ECM-level short-circuit verification, with safety warnings about the 90–120 volt injector system present throughout.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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