This document is a CAT C15 06-06 manual covering diagnostic code 0006-06 (Cylinder #6 Injector Current High) for C15 on-highway truck engines with MXS, NKS, or RKS serial prefix configurations. It provides step-by-step procedures to diagnose and repair short circuit conditions in the No. 6 injector solenoid circuit, including harness inspection, resistance measurements, ECM connector checks, and injector replacement guidance.
Official CAT C15 06-06 document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (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
- 0006-06 Cylinder #6 Injector Current High (74) — Conditions, System Response, and Initial Test Step
- Injector Solenoid Circuit — Test: System Operation Description
- Electronic Unit Injector (EUI) illustration
- Schematic for C15 engines
- 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 — Interpret Results (OK / Open / Short)
- 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
- Test Step 8: Check the ECM for a Short Circuit
- Short circuit return line resistance measurement and injector replacement
Applicable truck models
This manual applies to the Caterpillar C15 on-highway truck engine, specifically configuration MXS00001-UP. It also references procedures valid for NKS and RKS serial prefix C15 engines. The document covers Electronic Unit Injectors (EUI) that are mechanically actuated and electronically controlled, operating at 90–120 volts. The ECM sends a 105 volt pulse to each injector solenoid at the correct timing and duration for the given engine load and speed. P2 ECM connector pins covered include P2-99 (Injector 5 & 6 supply), P2-104, P2-105, P2-106, P2-107, P2-108, P2-115, P2-116, and P2-118. For official Caterpillar service resources, visit Caterpillar Support.
Who needs this CAT C15 06-06 manual
Diesel mechanics and workshop owners diagnosing engine misfires, low power, or active injector fault codes on C15-powered trucks need this manual. It is essential for anyone performing the Injector Solenoid Test or Cylinder Cutout Test using Caterpillar Electronic Technician (Cat ET), or tracing wiring faults through the engine harness and valve cover connectors with a 257-8718 Adapter Cable (120-PIN Breakout).
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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