This CAT C15 05-06 document provides the complete diagnostic procedure for DTC 0005-06 Cylinder #5 Injector Current High (74) and the related Injector Solenoid Circuit Test on Caterpillar C15 on-highway truck engines (MXS configuration). It details the conditions that generate the fault code, system responses, step-by-step electrical testing sequences, and repair actions for open-circuit and short-circuit conditions in the injector solenoid wiring.
Official CAT C15 05-06 document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (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
- 0005-06 Cylinder #5 Injector Current High (74) — Conditions, System Response, and Test Step 1
- Injector Solenoid Circuit — Test: System Operation Description
- Cylinder Cutout Test procedure and Manual Cylinder Cutout Test
- Injector Solenoid Test — interpreting OK, Open, and Short results
- Test Step 1: Inspect Electrical Connectors and Wiring (90–120 V shock hazard warnings)
- Test Step 3: Check the Variation of the Injectors between Cylinders (dynamometer procedure)
- Test Step 5: Check Harness between ECM and 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)
- Test Step 8+: Check the ECM for a Short Circuit — P2 connector diagnostics
- Return-line resistance measurement and final injector replacement steps
- Illustrations: Electronic Unit Injector, C15 engine schematic, P2 ECM connector pinout, valve cover connectors, injector harness connector
Applicable truck models
This publication applies to the Caterpillar C15 on-highway truck engine, configuration MXS00001-UP. The C15 uses mechanically actuated, electronically controlled Electronic Unit Injectors (EUI) with a 105-volt solenoid pulse controlled by the ECM. The document references diagnostics via Caterpillar Electronic Technician (Cat ET) and covers all six cylinder injector current codes (1-05 through 6-06). It also references DTC 253-02 for unprogrammed injector codes. P2 ECM connector pins documented include P2-99, P2-104, P2-105, P2-106, P2-107, P2-108, P2-115, P2-116, and P2-118. For official Caterpillar parts and service information, visit Caterpillar Support.
Who needs this CAT C15 05-06 manual
Diesel mechanics and workshop owners diagnosing misfires, low power, or injector current fault codes on C15 truck engines will find this guide essential. It is particularly useful when Cat ET reports “SHORT” or “OPEN” during the Injector Solenoid Test and when the automatic Cylinder Cutout Test is inoperative due to active codes.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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