This 9-page C15 coolant diverter DTCs troubleshooting document provides the official Caterpillar diagnostic procedure for fault code 0284-06 (Engine Coolant Diverter current high). It covers the complete solenoid circuit test sequence for C15 On-Highway Truck Engines with MXS configuration, including wiring inspection, Cat ET special tests, and ECM connector checks.
Official C15 coolant diverter DTCs troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | Engine Coolant Diverter Circuit — SMCS 5479-038-CLT |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, Updated 25/02/2009 |
| Pages | 9 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- 0284-06 Engine Coolant Diverter current high (98) — Conditions Which Generate This Code, System Response
- Engine Coolant Diverter Circuit – Test — System Operation Description
- Coolant Diverter Valve Test overview (Cat ET special test)
- Schematic illustrations (P2 ECM connector, solenoid for coolant diverter valve)
- Test Step 1: Inspect Electrical Connectors and Wiring
- Test Step 2: Check for Active Diagnostic Codes
- Test Step 3: Short the Wires at the Solenoid
- Test Step 4: Short the Circuit at the ECM
- Test Step 5: Create an Open at the Solenoid
- Test Step 6: Create an Open at the ECM
Applicable truck models
This document applies to the Caterpillar C15 On-Highway Truck Engine, configuration MXS00001-UP. The procedure is valid only for engines equipped with an engine coolant diverter valve. During normal operation, coolant flows to a jacket water aftercooler to cool intake air after the turbochargers. The coolant diverter valve stops this flow in cold-climate idle conditions to prevent overcooling of the engine and low cab temperatures. The document also references diagnostic code 284-05 (current low), which shares the same circuit test procedure. Key wiring identifiers include wire T855-BU at P2-5 and wire H807-YL at P2-79 on the ECM connector. The ECM triggers fault code 0284-06 when it detects greater than 3.5 A for at least eight seconds while attempting to activate the diverter. For official Caterpillar parts and service information, visit Caterpillar Support.
Who needs this C15 coolant diverter DTCs troubleshooting manual
Diesel mechanics and workshop owners servicing C15-powered highway trucks will need this manual when diagnosing DTC 0284-06 or 0284-05 related to the coolant diverter solenoid circuit. The six-step procedure requires Caterpillar Electronic Technician (Cat ET) software and covers connector inspection, jumper-wire tests at the solenoid and ECM, and criteria for ECM replacement.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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