This document is a C15 Top 2 DTCs troubleshooting procedure for Eaton Top 2 transmission solenoid faults on a C15 on-highway truck engine. It covers diagnostic code 55-05 Auxiliary Output #07 current low (67) and points the technician to the Eaton Top 2 Transmission Circuit – Test. The file is a 14-page English PDF from Caterpillar troubleshooting media RENR5088-10.
Official C15 Top 2 DTCs 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
- 0055-05 Auxiliary Output #07 current low (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
- Special test procedures for Shift Solenoid and Lockout Solenoid
- ECM output checks for output No. 7 and output No. 6
- Test Step 6. Check the Gear Ratios
Applicable truck models
This manual applies to the C15 On-Highway Truck MXS00001-UP configuration shown in the extract, with an Eaton Top 2 transmission programmed through the ECM. The procedure addresses ECM-controlled top two gear shifting, output No. 7 for the shift solenoid, output No. 6 for the lockout solenoid, Cat ET special tests, J1/P1 ECM connector inspection, firewall bulkhead connector inspection, air pressure notes, and gear ratio parameter checks. Related active or logged diagnostic codes listed in the procedure include 54-05 Auxiliary Output #06 current low, 54-06 Auxiliary Output #06 current high, 55-05 Auxiliary Output #07 current low, 55-06 Auxiliary Output #07 current high, and 191-07 Transmission Not Responding. For brand information, visit Caterpillar official website.
Who needs this C15 Top 2 DTCs manual
Workshop owners, fleet mechanics, and truck electrical diagnosticians need this document when a C15 truck defaults to manual operation, disables Eaton Top 2 mode, or logs current low and current high faults for the transmission solenoids. It is also useful when verifying Transmission Style programming, Top Gear Ratio values, solenoid driver wiring, and whether the fault is in the harness, transmission circuit, or ECM.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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