This PACCAR DTC 7803 7804 manual covers troubleshooting procedures for center/steer axle oil temperature gauge failures on PACCAR trucks (2011 and newer). Published by PACCAR, the document provides step-by-step diagnostic protocols using the Electronic Service Analyst (ESA) hardware and software tool to identify open circuit faults (DTC 7803) and short circuit faults (DTC 7804) in the axle oil temperature sensor circuit.
The guide is designed for automotive technicians and workshop owners who require systematic fault-finding methods for multiplexed instrumentation problems affecting the Center/Steer Axle Oil Temperature Gauge.
Document details and specifications — PACCAR DTC 7803
| Brand | PACCAR |
| System/Group | DTCs / Cab Electrical System |
| Publication number | PM819003 / KM815056 |
| Year/Revision | 09/16/2011 |
| Pages | 5 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Table of contents
- Center/Steer Axle Oil Temperature Gauge Inoperative — DTC7803 and DTC7804
- Symptom overview and thermistor sensor operation
- Step 1–2: ESA connection and monitoring procedures
- Step 3: ESA simulation testing and CVSG data link verification
- Step 4: DTC diagnostic code interpretation (7803 open circuit / 7804 short circuit)
- Step 5: Oil temperature sensor connector continuity and resistance testing
- Step 6: DTC 7803 active fault diagnosis and sensor replacement
- Step 7: DTC 7804 active fault diagnosis and wiring repair
- Oil temperature sensor thermistor resistance-to-temperature conversion table (–40°F to 392°F)
Applies to these models
This PACCAR DTC 7803 7804 manual applies to PACCAR trucks manufactured in 2011 and newer model years equipped with electronic cab instrumentation and center/steer axle oil temperature monitoring systems. The procedures target vehicles using the Chassis Node connector and CVSG (CAN Vehicle System Gateway) multiplexed data link architecture.
For official PACCAR service resources and technical bulletins, visit PACCAR official website.
Who needs this PACCAR DTC 7803 7804 manual
Diesel truck technicians and workshop owners performing electrical system repairs and gauge diagnostics on PACCAR medium-duty and heavy-duty trucks require this manual. Specialists trained in ESA software operation will find the DTC 7803 7804 procedures essential for rapid fault isolation and component-level troubleshooting of inoperative temperature gauges.
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