This document is a CAT C-12 oil pressure troubleshooting procedure for diagnostic trouble code 0100-03 (Oil Pressure Voltage High, FMI 03). Published by Caterpillar as media number RENR1328-08, it details the exact conditions that trigger the code, the ECM system response, and the required test steps for 3406E, C-10, and C-12 on-highway truck engines.
Official CAT C-12 oil pressure troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-12 Truck Engine 9NS00001-UP; also applicable to 3406E, C-10, and C-12 on-highway engines (prefixes 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 03)
- System Response — ECM logging, snapshot, check engine lamp behavior, default oil pressure value
- Possible Performance Effect
- Troubleshooting — Test Step 1: Engine Pressure Sensor Open or Short Circuit Test
Applicable truck models
This procedure applies to Caterpillar truck engines in the 3406E, C-10, and C-12 families 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 Class 8 on-highway trucks from multiple OEMs. The ECM detects code 0100-03 when the engine oil pressure sensor signal exceeds 4.95 VDC for more than eight seconds, provided the ECM has been powered for at least two seconds and related 5-volt supply codes (232-03, 232-04) and low battery code (168-01) are not active. The ECM then defaults oil pressure to 600 kPa (88 psi) and illuminates the check engine lamp after ten cumulative hours. For official Caterpillar parts and service information, visit Caterpillar Support and Service.
Who needs this CAT C-12 oil pressure troubleshooting manual
Diesel mechanics and workshop owners diagnosing a persistent 0100-03 fault code on 3406E, C-10, or C-12 engines need this document. It provides the precise trigger conditions, default values used by the ECM, and directs the technician to the correct sensor circuit test procedure.
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