This PACCAR brake saver oil temperature gauge troubleshooting manual covers diagnostic procedures for DTCs 138703 and 138704 affecting the brake saver oil temperature gauge on PACCAR trucks from 2011 and newer. Published by PACCAR, Inc., this 4-page electrical system service document provides step-by-step diagnostic methods using the Electronic Service Analyst (ESA) hardware and software tool.
The manual addresses inoperative brake saver oil temperature gauges when all other gauges function normally, guiding technicians through systematized checks of the thermistor sensor circuit, wiring continuity, and component replacement protocols.
Document details
| Brand | PACCAR (Peterbilt, Kenworth, DAF) |
| Model coverage | PACCAR trucks 2011 and newer |
| System/Group | DTCs / Cab (Electrical System) |
| Publication no. | PM819003/KM815056 |
| Year/Revision | 09/16/2011 |
| Pages | 4 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Table of contents
- Brake Saver Oil Temperature Gauge Inoperative (DTC 138703 and DTC 138704)
- Diagnostic procedure using ESA Monitor and Simulate functions
- CVSG data link wiring checks and gauge position verification
- Sensor connector continuity testing (Pin A ground, Pin B signal)
- DTC 138703 diagnosis (open circuit faults)
- DTC 138704 diagnosis (short circuit faults)
- Thermistor resistance table and temperature correlation
- Sensor replacement and ICU testing procedures
Applies to
This brake saver oil temperature gauge diagnostic document applies to PACCAR-equipped trucks (Peterbilt, Kenworth, DAF) manufactured from 2011 onward. The manual references the 52-pin ICU connector, CECU pinout, and thermistor-based oil temperature sensors integrated into multiplex instrumentation dashboards. Consult PACCAR official support for additional technical resources.
Who needs this brake saver oil temperature gauge manual
Truck mechanics and workshop technicians diagnosing inoperative brake saver oil temperature gauges on PACCAR-branded vehicles need this troubleshooting manual. Technicians must be proficient with ESA diagnostic software and have knowledge of multiplexed instrumentation systems to use this service guide effectively.
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