This PACCAR outside air temperature diagnostic manual provides detailed service procedures for diagnosing inoperative or inaccurate outside air temperature displays on PACCAR trucks from 2011 and newer. Published by PACCAR as part of the Electrical System Service Manual, it covers the multiplexed instrumentation system that uses a thermistor sensor mounted in the driver’s side mirror to measure ambient temperature.
The manual is designed for use with the Electronic Service Analyst (ESA) hardware and software diagnostic tool and assumes the service technician has prior knowledge of this platform.
Document details and specifications — PACCAR outside air
| Brand | PACCAR |
| Model coverage | 2011 and newer PACCAR trucks |
| System/Group | Electrical System / DTCs — Cab |
| Publication number | PM819003/KM815056 |
| Year/Revision | 09/16/2011 |
| Pages | 4 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Table of contents
- Outside Air Temperature Display Inoperative (DTC 17103 and DTC 17104)
- Symptom description and sensor overview
- Step-by-step diagnostic procedure using ESA Monitor, Simulate, and Diagnose functions
- Sensor resistance reference table (°C and °F)
- Continuity testing for ground and signal wires
- Alternate test method using resistor decade box
- DTC 17103 diagnosis (open circuit)
- DTC 17104 diagnosis (short circuit)
- CECU pinout references and connector pin details
Applies to these models
This PACCAR outside air temperature manual applies to all PACCAR trucks manufactured in 2011 and newer equipped with electronic cab instrumentation, including models using the CECU (Cab Electronic Control Unit) or ICU (Instrumentation Control Unit). The diagnostic procedures reference the 52-pin CECU connector and driver’s side mirror thermistor sensor assembly. For more information about PACCAR service documentation, visit PACCAR official website.
Who needs this PACCAR outside air temperature manual
Heavy-duty truck mechanics and workshop technicians diagnosing outside air temperature display faults need this guide. Shops equipped with ESA diagnostic software will use these procedures to isolate whether the problem originates in the sensor, wiring harness, or instrument cluster control unit when outside air temperature codes 17103 or 17104 are logged.
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