This CAT C15 290-05 actuator troubleshooting document provides the complete diagnostic procedure for fault code 0290-05 (Intake Valve Actuator #6 Current Low) on Caterpillar C15 on-highway truck engines with MXS serial prefix. It details the conditions that generate the code, the ECM system response, step-by-step electrical testing, and repair instructions for wiring harness and solenoid replacement.
Official CAT C15 290-05 actuator document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (On-Highway, MXS00001-UP) |
| System / Group | Intake Valve Actuator Circuit — DTCs 285 through 290 (current low and current high) |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, updated 25/02/2009 |
| Pages | 12 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0290-05 Intake Valve Actuator #6 Current Low (94) — Conditions Which Generate This Code, System Response
- Intake Valve Actuator Circuit — Test: System Operation Description
- Intake Valve Actuator Solenoid Test prerequisites and procedure
- C15 schematic, P2 ECM connector pin locations, valve cover connector terminal identification
- Location of components (check valve, actuator solenoid, face seals, pressure sensor, pressure solenoid)
- Test Step 1: Inspect Electrical Connectors and Wiring (pull test, torque check, abrasion inspection)
- Test Step 2: Check for Active Diagnostic Codes via Cat ET
- Test Step 3: Create a Short Circuit at the Valve Cover Connector
- Test Step 4: Create a Short Circuit at the ECM (J2/P2 connector)
- Test Step 5: Open the Wires of the Suspect Solenoid at the Valve Cover Connector
- Test Step 6: Measure resistance between supply/return wires and ECM connector terminals
- Test Step 7: Verify solenoid replacement — temporarily connect new solenoid and clear logged codes
Applicable truck models
This procedure applies to Caterpillar C15 on-highway truck engines with the MXS serial number prefix (configuration MXS00001-UP). It also covers related NKS and RKS configurations within the C15 engine family. The guide addresses all twelve intake valve actuator DTCs (285-05 through 290-06) across all six cylinders, making it relevant to any C15-powered Class 8 truck experiencing engine brake or intake valve actuator faults. For additional Caterpillar service resources, visit Caterpillar Support and Service.
Who needs this CAT C15 290-05 actuator manual
Diesel mechanics and workshop owners diagnosing low-power complaints, check engine lamp illumination, or logged DTC 0290-05 on C15-equipped trucks will find every required test step, connector pinout, and repair path in this document. Fleet maintenance teams working with Cat Electronic Technician (ET) software will use the Intake Valve Actuator Solenoid Test referenced throughout.
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