This 14-page CAT C15 oil pressure troubleshooting document provides the complete diagnostic procedure for fault code 0100-03 (Oil Pressure Voltage High) on Caterpillar C15 on-highway truck engines with MXS serial prefix. It details the conditions that generate the code, system response behavior, and a multi-step electrical test sequence covering sensor circuits, wiring harness integrity, and ECM verification.
Official CAT C15 oil pressure document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | Engine Pressure Sensor Diagnostics / DTCs |
| 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
- 0100-03 Oil Pressure Voltage High (24) — Conditions Which Generate This Code
- System Response — ECM default behavior (600 kPa / 88 psi default oil pressure)
- 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 — special procedure
- Illustrations — Schematic for engine pressure sensors, sensor locations (left and right side views), P2 ECM connector terminal locations
- Test Step 1 — Perform Engine Pressure Sensor Open or Short Circuit Test
- Test Step 2 — Check Integrity of Connections at Connectors
- Test Step 3 — Check Supply Voltage at Sensor Connector (4.5–5.5 VDC expected)
- Test Step 5 — Check Signal Wire for Open Circuit
- Test Step 6 — ECM verification with test ECM
- Test Step 7 — Check Signal Wire for Short Circuit
- Test Step 8 — ECM replacement procedure
Applicable truck models
This document applies to Caterpillar C15 on-highway truck engines with serial prefix MXS (configuration MXS00001-UP). The procedures also reference NKS and RKS serial prefix variants within the C15 platform. The pressure sensor diagnostic tests cover the oil pressure sensor (P2-28), boost pressure sensor (P2-15), barometric pressure sensor, and intake valve actuation system (IVA) oil pressure sensor, all sharing common signal return lines at P2-17 and P2-54 on the ECM connector. For additional Caterpillar service resources, visit Caterpillar’s official support page.
Who needs this CAT C15 oil pressure manual
Diesel mechanics and workshop owners diagnosing an active or logged 0100-03 fault code on C15 MXS engines will find this manual essential. It provides the exact voltage thresholds, connector pin locations, multimeter test sequences, and ECM replacement criteria needed to resolve oil pressure sensor circuit faults without unnecessary parts replacement.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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