This 17-page PDF is a C15 injector troubleshooting DTCs manual for diagnosing low and high injector current fault codes on Caterpillar C15 on-highway truck engines (MXS configuration). It details the step-by-step diagnostic procedure for DTC 0002-05 Cylinder #2 Injector Current Low (72), the Injector Solenoid Circuit Test, the Cylinder Cutout Test, and harness resistance checks covering open and short circuit conditions across all six cylinders.
Official C15 injector troubleshooting DTCs 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 — DTCs 1-05 through 6-06 |
| 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
- 0002-05 Cylinder #2 Injector Current Low (72) — Conditions, System Response, and Initial Test Step
- Injector Solenoid Circuit — Test (System Operation Description)
- Electronic Unit Injector Illustration
- Schematic for C15 Engines — P2 ECM Connector Pin-Outs and Valve Cover Connectors
- Test Step 1: Inspect Electrical Connectors and Wiring
- Test Step 3: Check the Variation of the Injectors between Cylinders (Cylinder Cutout Test procedure)
- Test Step 4: Injector Solenoid Test — Evaluate OK / Open / Short Results
- Test Step 5: Check Harness between ECM and Valve Cover Base for Open Circuit
- Test Step 6: Swap Injector Harness to Isolate Faulty Injector
- Test Step 7: Check the ECM for an Open Circuit (using 257-8718 Adapter Cable / 120-PIN Breakout)
- Test Step 8–9: Check ECM and Harness for Short Circuit — Resistance Measurements
Applicable truck models
This document applies specifically to the Caterpillar C15 on-highway truck engine, configuration MXS00001-UP. The engines covered use mechanically actuated, electronically controlled Electronic Unit Injectors (EUI) with a 105-volt solenoid pulse controlled by the Engine Control Module (ECM). The procedure references the P2/J2 ECM connector, valve cover base connectors, and the 257-8718 Adapter Cable (120-PIN Breakout). Injector codes must be programmed into the ECM per the calibration procedure; failure to do so triggers DTC 253-02. For additional product support, visit Caterpillar’s official support page.
Who needs this C15 injector troubleshooting DTCs manual
Diesel mechanics and workshop owners working on C15-powered trucks need this manual when diagnosing misfires, low power, or active injector current fault codes (cylinders 1 through 6, codes x-05 and x-06). It is also essential when performing the Cylinder Cutout Test on a dynamometer or the Injector Solenoid Test with Cat Electronic Technician (ET).
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