This 14-page CAT C15 Eaton Top 2 troubleshooting document provides the official diagnostic procedure for fault codes related to the Eaton Top 2 automatic transmission shift system on C15 on-highway truck engines. It details conditions that generate each code, system response behavior, wiring connections at the ECM, and step-by-step electrical tests using Cat ET service software.
Official CAT C15 Eaton Top 2 document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (On-Highway, MXS00001-UP) |
| System / Group | Eaton Top 2 Transmission Circuit — Diagnostic Trouble Codes |
| 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
- 0054-05 Auxiliary Output #06 Current Low (66) — Conditions Which Generate This Code, System Response
- Eaton Top 2 Transmission Circuit — Test (System Operation Description)
- Background Information — Shift logic, solenoid operation, upshift and downshift behavior
- Customer Specified Parameters — Transmission Style, gear ratio programming
- System Problems — Manual operation default, nine-second countdown procedure
- Wiring Connections at the ECM — Output No. 6 (lockout solenoid), Output No. 7 (shift solenoid)
- Test Step 1 — Perform Eaton Top 2 Transmission Circuit Test
- Test Step 2 — Inspect Electrical Connectors and Wiring (J1/P1 ECM connector, firewall bulkhead)
- Test Steps 3–5 — Solenoid special tests via Cat ET, voltage test lamp procedures, breakout T checks, ECM replacement verification
- Test Step 6 — Check Gear Ratios against customer specified parameters
Applicable truck models
This document applies exclusively to Caterpillar C15 on-highway truck engines in the MXS serial number prefix range (MXS00001-UP). The procedures cover trucks equipped with an Eaton Top 2 transmission where the ECM “Transmission Style” parameter is programmed to “Eaton Top 2.” It addresses both 10-speed and 13-speed Eaton transmissions, referencing top gear, top gear minus one, and top gear minus two positions. The diagnostic codes covered are 54-05, 54-06, 55-05, 55-06, and 191-07. For additional engine specifications and technical resources, visit the Caterpillar official support page.
Who needs this CAT C15 Eaton Top 2 manual
Fleet mechanics and workshop owners servicing Caterpillar C15-powered trucks with Eaton automated transmissions need this manual when diagnosing low or high current faults on auxiliary outputs 6 and 7 or a 191-07 Transmission Not Responding code. It is essential for anyone performing solenoid circuit tests using Cat ET special test screens and breakout T connectors.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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