This 2-page PDF is a CAT 0100-04 oil pressure troubleshooting document for Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It details the conditions that generate diagnostic code PID 0100 FMI 04 (oil pressure voltage low), the ECM system response, possible performance effects, and the recommended repair procedure. The guide is drawn from Caterpillar SIS publication RENR1328-08, revised October 2008.
Official CAT 0100-04 oil pressure document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (configurations 8YS, 9NS, 5DS, 1LW) |
| System / Group | Engine Oil Pressure Sensor Circuit — SMCS 1924-038 |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Conditions Which Generate This Code (PID 0100 FMI 04)
- System Response
- Possible Performance Effect
- Troubleshooting — Test Step 1: Engine Pressure Sensor Open or Short Circuit Test
Applicable truck models
This document applies to Caterpillar on-highway truck engines in the 3406E, C-10, and C-12 families. The specific configuration referenced is the C-12 Truck Engine 9NS00001-UP, but the diagnostic procedure also covers engine serial prefixes 8YS, 5DS, and 1LW. The Engine Control Module (ECM) triggers code PID 0100 FMI 04 when the engine oil pressure sensor signal voltage falls below 0.2 VDC for more than eight seconds, provided no related 5-volt supply or battery power faults are active. The ECM defaults oil pressure to 600 kPa (88 psi) and illuminates the check engine lamp after the code has been active for more than ten hours. A special note warns that elevations above 1900 m (6300 ft) — where atmospheric pressure drops below 79 kPa (12 psi) — may cause the code to activate only while the engine is running, as the lower atmospheric pressure pushes the signal voltage below the 0.2 VDC trip point in an otherwise good circuit. The single troubleshooting step directs the technician to perform the “Engine Pressure Sensor Open or Short Circuit – Test” diagnostic procedure. For additional Caterpillar technical resources, visit the Caterpillar official support page.
Who needs this CAT 0100-04 oil pressure manual
Fleet mechanics, independent diesel technicians, and workshop owners servicing Caterpillar 3406E, C-10, or C-12 powered trucks will find this document essential when diagnosing a voltage-low condition on the engine oil pressure sensor circuit. It provides the exact fault-code trigger thresholds, ECM default behavior, and the correct Caterpillar test procedure reference needed to resolve the issue efficiently.
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