This 14-page PDF is a CAT C15 boost pressure troubleshooting guide for diagnostic code 0102-03 (Boost Pressure voltage high, PID 0102 FMI 03). It details the conditions that generate the code, system response defaults, and a structured test sequence for isolating faults in the boost pressure sensor circuit, wiring harness, and ECM on C15 On-Highway Truck engines (MXS configuration).
Official CAT C15 boost pressure troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | C15 DTCs — Boost Pressure Sensor Circuit (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
- 0102-03 Boost Pressure voltage high (25) — conditions, system response, and possible performance effects
- Test Step 1: 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 — crankcase breather inspection
- Illustrations: Schematic for engine pressure sensors, sensor locations (left and right side views), P2 ECM connector terminal locations
- 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: Check ECM for proper response — test ECM mode procedure
- Test Step 7: Check Signal Wire for Short Circuit
- Test Step 8: ECM detection verification at P2 connector — final wiring and ECM replacement steps
Applicable truck models
This document applies specifically to the Caterpillar C15 On-Highway Truck Engine, configuration MXS00001-UP (MXS, NKS, or RKS serial number prefixes). The procedures reference the P2 ECM connector with terminal locations P2-15 (boost pressure), P2-17 and P2-54 (sensor return), P2-28 (engine oil pressure), P2-57 (barometric pressure), P2-72 (sensor supply), P2-74 (intake valve actuation pressure), and P2-80 (sensor). While the primary focus is DTC 0102-03, the Engine Pressure Sensor Open or Short Circuit test also covers oil pressure, barometric pressure, and intake valve actuation system oil pressure sensor codes. For official Caterpillar parts and service support, visit Caterpillar’s official website.
Who needs this CAT C15 boost pressure troubleshooting manual
Diesel mechanics and workshop owners working on C15-powered highway trucks will use this document when the check engine lamp illuminates for a high-voltage boost pressure sensor fault. It provides the exact multimeter readings, jumper-wire tests, and ECM replacement sequence needed to resolve low-power complaints tied to this diagnostic code.
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