This PACCAR pyrometer gauge inoperative diagnostic manual covers systematic troubleshooting procedures for DTC 17303 (open circuit) and DTC 17304 (short circuit) faults affecting the exhaust temperature gauge on 2011 and newer cab electrical systems. Published by PACCAR as part of their Electrical System Service Manual, the document provides step-by-step ESA (Electronic Service Analyst) diagnostic workflows and thermocouple sensor testing methods for workshop technicians.
The pyrometer gauge uses a thermocouple sensor to measure engine exhaust gas temperature downstream of the turbocharger. When the pyrometer gauge inoperative condition occurs, this manual guides technicians through signal monitoring, wiring continuity verification, and sensor replacement procedures to restore functionality.
Document details and specifications — PACCAR pyrometer gauge
| Brand | PACCAR |
| Model coverage | PACCAR trucks (2011 and newer) |
| System/Group | DTCs / Cab Electrical System |
| Publication number | PM819003/KM815056 |
| Year/Revision | 09/16/2011 |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Table of contents
- Pyrometer Gauge Inoperative — DTC 17303 and DTC 17304
- Symptom Description and Sensor Overview
- Step 1: ESA Connection and Monitor Setup
- Step 2: Exhaust Temperature Component Monitoring
- Step 3: Simulation Testing and CVSG Data Link Verification
- Step 3-1: Daisy Chain Wiring and ICU Connector Continuity Checks
- Step 4: Active Diagnostic Trouble Code Diagnosis
- Step 5: Pyrometer Sensor Connector Testing and Resistance Table
- Step 6: DTC 17303 Open Circuit Diagnostics
- Step 7: DTC 17304 Short Circuit Diagnostics
- Thermocouple Resistance Reference Table (−40 to +1000°C)
Applies to these models
This PACCAR pyrometer gauge inoperative diagnostic applies to PACCAR-branded trucks manufactured from 2011 onwards equipped with electronic cab instrumentation and thermocouple-based exhaust temperature sensors. The procedures use the ESA hardware/software platform and reference the 52-pin ICU (Instrument Control Unit) electrical architecture. PACCAR official website
Who needs this PACCAR pyrometer gauge inoperative manual
Diesel truck technicians and workshop owners diagnosing intermittent or non-functional exhaust temperature gauges on PACCAR trucks must reference this manual. Service professionals performing multiplexed instrumentation repairs and utilizing ESA diagnostic tools will find the step-by-step wiring checks, sensor simulation procedures, and DTC interpretation essential for efficient resolution of pyrometer gauge inoperative faults.
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