This is the PACCAR center steer axle temperature gauge service manual covering diagnostic trouble codes DTC 7803 and DTC 7804. Published by PACCAR as part of the Electrical System Service Manual (publication PM819003/KM815056, revised 09/16/2011), this five-page guide provides step-by-step procedures for diagnosing and repairing inoperative center/steer axle oil temperature gauges using the Electronic Service Analyst (ESA) diagnostic tool.
The manual addresses cases where the center/steer axle oil temperature gauge becomes inoperative while all other gauges remain operational. It assumes the service technician is knowledgeable in ESA hardware and software operation.
Document details and specifications — PACCAR center steer
| Brand | PACCAR |
| System/Group | DTCs / Cab (2011 & Newer) |
| Publication number | PM819003/KM815056 |
| Revision date | 09/16/2011 |
| Pages | 5 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Table of contents
- Center/Steer Axle Oil Temperature Gauge Inoperative — DTC 7803 and DTC 7804
- Symptom and thermistor sensor overview
- Step 1: Ignition and ESA connection
- Step 2: Monitor center/steer axle oil temperature component
- Step 3: Simulate gauge function and CVSG data link wiring checks
- Step 4: Diagnose DTCs (DTC 7803 open circuit / DTC 7804 short circuit)
- Step 5: Oil temperature sensor harness connector continuity testing
- Step 5 alternate: Resistor decade box sensor simulation and resistance table (-40°F to 392°F)
- Step 6: DTC 7803 active fault diagnosis and sensor replacement
- Step 7: DTC 7804 active fault diagnosis and wiring repair
Applies to these models
This manual applies to PACCAR trucks manufactured 2011 and newer equipped with multiplexed center/steer axle oil temperature instrumentation connected via CVSG data link and Chassis Node electrical architecture. The procedures cover diagnostic and repair of thermistor-based oil temperature sensors in center and steer axle applications.
For more information about PACCAR service manuals and diagnostic tools, visit PACCAR official website.
Who needs this PACCAR center steer axle temperature gauge manual
Diesel truck mechanics and workshop owners troubleshooting inoperative PACCAR center/steer axle oil temperature gauges require this center steer axle temperature gauge manual. The guide is essential for technicians using ESA diagnostic equipment to isolate faults between the CECU control module, Chassis Node connections, sensor wiring, and the thermistor sensor itself.
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