This intake valve DTCs actuator troubleshooting document provides the complete diagnostic procedure for fault code 0286-05 (Intake Valve Actuator #2 Current Low) on Caterpillar C15 on-highway truck engines with MXS configuration. It details how the Engine Control Module detects a low-current open-circuit condition and walks technicians through a structured test sequence from connector inspection to ECM replacement.
Official intake valve DTCs actuator document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | Intake Valve Actuator Circuit — DTCs 285 through 290 (codes -05 and -06) |
| 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
- 0286-05 Intake Valve Actuator #2 Current Low (92) — 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, and valve cover connector terminal identification
- Location of components: check valve, actuator solenoid, face seals, intake valve actuation pressure sensor, and 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
- Test Step 5: Open the Wires of the Suspect Solenoid at the Valve Cover Connector
- Final repair steps: solenoid replacement, harness repair, ECM replacement
Applicable truck models
This procedure applies to Caterpillar C15 on-highway truck engines in the MXS serial number range (MXS00001-UP), also referenced alongside NKS and RKS configurations. The intake valve actuator system covered here is specific to engines equipped with hydraulic intake valve actuation controlled by electric solenoids. The document addresses all six cylinder actuator circuits (DTCs 285 through 290) with both current-low (-05) and current-high (-06) fault codes. For additional engine specifications and support resources, visit Caterpillar’s official support page.
Who needs this intake valve DTCs actuator manual
Fleet mechanics and independent workshop owners diagnosing low-power complaints or check-engine-lamp illumination on C15-powered trucks will find this guide essential. It is particularly useful when Cat ET reports an active 0286-05 code or displays “OPEN” during the Intake Valve Actuator Solenoid Test, providing step-by-step wiring checks, jumper-wire tests, and component replacement instructions.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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