This document is a CAT 0100-01 low oil pressure troubleshooting guide covering diagnostic code 46 for Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It provides a structured, step-by-step fault isolation procedure to identify and resolve low engine oil pressure warnings detected by the ECM. The guide spans nine test steps, from basic oil level checks through sensor voltage measurements and mechanical pressure verification.
Official CAT 0100-01 low oil pressure document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (8YS, 9NS, 5DS, 1LW prefix configurations) |
| System / Group | Engine Oil Pressure — Diagnostic Trouble Code 0100-01 (Warning 46), SMCS 1924-038 |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 8 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Conditions Which Generate This Code — ECM detection criteria and oil pressure trip line illustrations
- System Response — Cat ET display messages, check engine lamp and warning lamp behavior
- Test Step 1: Check the Engine Oil Level
- Test Step 2: Verify Proper Sensor Installation and Wiring
- Test Step 3: Check for Active Diagnostic Codes (barometric and boost pressure sensors)
- Test Step 4: Check the Status Screen — Boost Pressure and Engine Oil Pressure readings via Cat ET
- Test Step 5: Check the Supply Voltage to the Pressure Sensors (5.0 ± 0.16 VDC)
- Test Step 6: Install a Pressure Gauge (1U-5470 Engine Pressure Group) and Compare Readings
- Test Step 7: Compare the Readings to the Oil Pressure Map
- Test Step 8: Check the Supply Voltage to the Boost Pressure Sensor
- Test Step 9: Check the Supply Voltage to the Engine Oil Pressure Sensor
Applicable truck models
This troubleshooting procedure applies to Caterpillar 3406E, C-10, and C-12 on-highway truck engines with serial prefix configurations 8YS, 9NS, 5DS, or 1LW. The specific configuration referenced is the C-12 Truck Engine 9NS00001-UP. These engines are widely installed in heavy-duty Class 8 trucks used for long-haul and vocational applications. For official parts lookup and additional technical resources, visit Caterpillar Support and Service.
Who needs this CAT 0100-01 low oil pressure manual
Diesel mechanics and workshop owners troubleshooting a “LOW OIL PRESSURE” diagnostic event on 3406E, C-10, or C-12 engines will use this guide. It requires access to Caterpillar Electronic Technician (Cat ET), a multimeter, and the 1U-5470 Engine Pressure Group for complete fault isolation.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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