This CAT C15 Eaton transmission document is a troubleshooting procedure for Eaton Top 2 transmission circuit diagnostic codes on C15 On-Highway Truck MXS engines. It covers Auxiliary Output #06 and #07 current faults, 191-07 Transmission Not Responding, Cat ET special tests, wiring checks, and gear-ratio parameter verification.
Official CAT C15 Eaton transmission document details
| Brand | CAT |
|---|---|
| Model coverage | C15 Truck Engine MXS; C15 On-Highway Truck MXS00001-UP |
| System/Group | C15 (MXS, NKS, or RKS) / DTCs; Eaton Top 2 Transmission Circuit – Test |
| Publication no. | RENR5088-10 |
| Year/Revision | Publication Date 01/02/2009; Date Updated 25/02/2009 |
| Pages | 14 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0055-06 Auxiliary Output #07 current high (67)
- Conditions Which Generate This Code
- System Response
- Test Step 1. Perform the following diagnostic procedure: Eaton Top 2 Transmission Circuit – Test
- Eaton Top 2 Transmission Circuit – Test
- System Operation Description
- Background Information
- System Problems
- Wiring Connections at the ECM
- Customer Specified Parameters
- Test Step 2. Inspect the Electrical Connectors and the Wiring
- Cat ET diagnostic tests for Shift Solenoid and Lockout Solenoid
- Voltage test lamp checks at the solenoid connector and ECM breakout T
- Test ECM and wiring isolation checks
- Test Step 6. Check the Gear Ratios
Applicable truck models
This manual applies to the Product: TRUCK ENGINE, Model: C15 TRUCK ENGINE MXS, Configuration: C15 On-Highway Truck MXS00001-UP. The procedure is written for engines programmed with Transmission Style Eaton Top 2 and covers the ECM outputs for the lockout solenoid on Output No. 6 and the shift solenoid on Output No. 7. It also references ten speed and thirteen speed Top 2 gear operation, including top gear, top gear minus one, and top gear minus two behavior. For manufacturer information, visit Caterpillar official website.
Who needs this CAT C15 Eaton transmission manual
Mechanics, fleet technicians, and workshop owners need this manual when a C15 truck logs 54-05, 54-06, 55-05, 55-06, or 191-07 and the Eaton Top 2 system drops into manual operation. It helps identify whether the fault is in the solenoid circuit, ECM output driver, wiring, air-operated transmission response, or customer specified gear-ratio parameters.
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