This 13-page Caterpillar troubleshooting document provides the official CAT C15 385-04 actuation diagnostic procedure for fault code 0385-04 (Intake Valve Actuation System Oil Pressure voltage low). It covers signal circuit testing, sensor supply voltage verification, and ECM validation steps for C15 On-Highway Truck engines with MXS, NKS, or RKS prefix serial numbers.
Official CAT C15 385-04 actuation document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (C15 On-Highway Truck MXS00001-UP) |
| System / Group | Intake Valve Actuation System Oil Pressure — DTCs (SMCS 1439-038-IL) |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, Updated 25/02/2009 |
| Pages | 13 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0385-04 Intake Valve Actuation System Oil Pressure voltage low (95) — conditions, system response
- 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)
- 108-3 Diagnostic Code and High Crankcase Pressure — background information
- Schematic for engine pressure sensors (Illustration 1)
- Locations of engine pressure sensors — left side and right side views (Illustrations 2 and 3)
- Terminal locations at the P2 ECM connector for engine pressure sensors (Illustration 4)
- Terminal locations at the sensor connector (Illustration 5)
- Test Step 1: Determine if the Code is Logged or Active
- Test Step 2: Check for intermittent problems at sensor and ECM connectors
- Test Step 3: Check the Supply Voltage at the Sensor Connector (4.5–5.5 VDC expected)
- Test Step 4: Check for Battery Voltage on the Signal Wire
- Test Step 5: Replace sensor to verify -3 code resolution
- Test Step 6: Check the ECM for Proper Operation
- Test Step 7: Check the Signal Wire for a Short Circuit
- Test Step 8: Verify open circuit detection at P2 connector — ECM replacement procedure
Applicable truck models
This document applies to Caterpillar C15 on-highway truck engines with MXS prefix serial numbers (MXS00001-UP). The C15 engine family — including NKS and RKS configurations — is installed in Class 8 highway trucks from multiple OEMs. The intake valve actuation pressure sensor is located on the right side of the engine and connects to the P2 ECM connector at terminal P2-74. The procedure also references related pressure sensors: boost pressure (P2-15), engine oil pressure (P2-28), and barometric pressure (P2-57), all sharing sensor supply pins P2-72 and P2-80 with sensor returns at P2-17 and P2-54. For parts lookup and additional technical resources, visit Caterpillar’s official website.
Who needs this CAT C15 385-04 actuation manual
Diesel mechanics and workshop owners diagnosing a check engine lamp caused by DTC 0385-04 on a C15 engine need this guide. It walks through each test step — from confirming active versus logged codes with Caterpillar Electronic Technician (Cat ET), through multimeter-based wire wiggle tests, supply voltage checks, signal wire short circuit isolation, and final ECM replacement verification.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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