This 14-page C15 boost pressure DTCs troubleshooting document provides the official diagnostic procedure for DTC 0102-04 (Boost Pressure voltage low, PID 0102 FMI 04) on Caterpillar C15 on-highway truck engines (MXS configuration). It details the conditions that generate the code, the ECM system response, performance effects, and a complete step-by-step electrical test sequence covering the boost pressure sensor circuit, supply voltage verification, signal wire checks, and ECM validation.
Official C15 boost pressure DTCs troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (C15 On-Highway Truck MXS00001-UP) |
| System / Group | Engine Pressure Sensors / Diagnostic Trouble Codes (SMCS 1439-038-PX; 1917-038) |
| 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
- 0102-04 Boost Pressure Voltage Low (25) — Conditions Which Generate This Code
- System Response and Default Behavior (100 kPa / 14.5 psi default)
- Possible Performance Effect — Low Power Condition
- Engine Pressure Sensor Open or Short Circuit — Test (covers DTCs 100-3, 100-4, 102-3, 102-4, 108-3, 108-4, 385-3, 385-4)
- Background Information — ECM Pull-Up Voltage Detection
- 108-3 Diagnostic Code and High Crankcase Pressure
- Schematic for Engine Pressure Sensors (Illustration 1)
- Locations of Engine Pressure Sensors — Left and Right Side Views (Illustrations 2–3)
- Terminal Locations at the P2 ECM Connector (Illustration 4–5)
- 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)
- Test Step 5 — Check Signal Wire for Open Circuit
- Test Step 6 — Check ECM for Proper Operation
- Test Step 7 — Check Signal Wire for Short Circuit
- Test Step 8 — ECM Verification and Replacement Procedure
Applicable truck models
This document applies to Caterpillar C15 on-highway truck engines in the MXS serial number range (MXS00001-UP). The procedure also references NKS and RKS configurations within the C15 platform. It covers the boost pressure sensor, engine oil pressure sensor, barometric pressure sensor, and intake valve actuation system (IVA) oil pressure sensor — all sharing the same diagnostic test framework. P2 ECM connector terminal locations are specified for each sensor (P2-15 boost, P2-28 oil, P2-57 barometric, P2-74 IVA). For additional technical resources, visit Caterpillar Support.
Who needs this C15 boost pressure DTCs troubleshooting manual
Diesel mechanics and workshop owners diagnosing low-power complaints or active DTC 0102-04 on C15-powered trucks will find the step-by-step electrical tests, wiring schematics, and ECM replacement procedures essential for efficient repair.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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