This document is a CAT C15 100-04 troubleshooting manual covering diagnostic code 0100-04 (Oil Pressure Voltage Low) for C15 On-Highway Truck Engines with MXS configuration. It provides step-by-step electrical testing procedures for engine pressure sensors, wiring harness inspection, and ECM fault isolation across 14 pages.
Official CAT C15 100-04 troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | Engine Pressure Sensors / DTCs (SMCS 1439-038-OC; 1924-038) |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, Updated 25/02/2009 |
| Pages | 14 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0100-04 Oil Pressure Voltage Low (PID 0100 FMI 04) — Conditions Which Generate This Code
- System Response and Possible Performance Effect
- Engine Pressure Sensor Open or Short Circuit — Test (covers codes 100-3, 100-4, 102-3, 102-4, 108-3, 108-4, 385-3, 385-4)
- 108-3 Diagnostic Code and High Crankcase Pressure
- Schematic for Engine Pressure Sensors (Illustration 1)
- Locations of Engine Pressure Sensors — Boost Pressure, Barometric Pressure, Engine Oil Pressure (Illustration 2)
- Test Step 1: Diagnostic Procedure Reference
- Test Step 2: Check Integrity of Connections at Connectors
- Test Step 3: Check Supply Voltage at Sensor Connector (4.5–5.5 VDC)
- Test Step 5: Check Signal Wire for Open Circuit
- Test Step 6: ECM Detection Verification at P2 Connector
- Test Step 7: Check Signal Wire for Short Circuit
- ECM Replacement Procedure — Test ECM Mode
Applicable truck models
This manual applies to Caterpillar C15 On-Highway Truck Engines, specifically the MXS configuration (serial numbers MXS00001-UP). The document also references procedures applicable to NKS and RKS serial prefixes within the C15 family. The ECM monitors signal voltage from the engine oil pressure sensor and triggers code 0100-04 when voltage drops below 0.2 VDC for more than eight seconds. Atmospheric pressures below 79 kPa at elevations above 1900 m (6300 ft) may cause false activation. For official Caterpillar parts and service information, visit Caterpillar Support.
Who needs this CAT C15 100-04 troubleshooting manual
Diesel mechanics and workshop owners servicing Caterpillar C15 on-highway engines will use this guide to diagnose voltage-low faults on the engine oil pressure sensor circuit. It is essential for anyone performing electrical connector inspections, multimeter-based supply voltage checks, signal wire open/short circuit tests, and ECM replacement procedures using Caterpillar Electronic Technician (ET).
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