This injector troubleshooting DTCs document provides the official Caterpillar diagnostic procedure for fault code 0001-06 Cylinder #1 Injector Current High (72) on C15 on-highway truck engines (MXS configuration). It details the conditions that generate the code, system responses, and a multi-step injector solenoid circuit test sequence covering open and short circuit diagnosis, harness inspection, ECM connector checks, and injector replacement criteria.
Official injector troubleshooting DTCs document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (On-Highway, 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
- 0001-06 Cylinder #1 Injector Current High (72) — Conditions, System Response
- Injector Solenoid Circuit – Test — System Operation Description
- Cylinder Cutout Test procedure
- Injector Solenoid Test procedure
- Test Step 1: Inspect Electrical Connectors and Wiring
- Test Step 3: Check Variation of Injectors between Cylinders
- 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 and beyond: Check the ECM for a Short Circuit
- Return line resistance measurement and final injector replacement steps
- P2 ECM connector pinout and valve cover connector terminal identification
- Schematics and illustrations for C15 engines (Illustrations 1–5)
Applicable truck models
This publication applies exclusively to Caterpillar C15 on-highway truck engines in the MXS configuration (serial numbers MXS00001-UP). The Electronic Unit Injectors (EUI) in these engines are mechanically actuated and electronically controlled, receiving a 105-volt pulse from the ECM. The procedures also reference related diagnostic codes for all six cylinders (DTC 1-05 through 6-06), covering both high and low current injector faults. Diagnostic work requires Caterpillar Electronic Technician (Cat ET) software and the 257-8718 Adapter Cable Assembly (120-PIN Breakout). For official Caterpillar parts and service information, visit Caterpillar Support.
Who needs this injector troubleshooting DTCs manual
Diesel mechanics and workshop owners working on C15-powered trucks that exhibit engine misfires, low power, or active injector current fault codes will find this document essential. It provides the structured, step-by-step diagnostic path — from initial connector inspection through ECM-level short and open circuit verification — needed to isolate faults without unnecessary injector replacement.
The full 17-page PDF is available in the DiagTechPro manuals library, free account required to download.
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