This is the PACCAR Electrical System Service Manual covering transfer case oil temperature gauge diagnostics and repair procedures. The document provides detailed troubleshooting steps using Electronic Service Analyst (ESA) hardware and software tools, addressing both DTC 138803 (open circuit) and DTC 138804 (short circuit) fault codes that cause the transfer case oil temperature gauge to become inoperative. Published by PACCAR under revision PM819003/KM815056, this manual is essential for technicians diagnosing multiplexed instrumentation problems in PACCAR trucks.
Document details
| Brand | PACCAR |
| Model coverage | 2011 & Newer |
| System/Group | DTCs / Cab |
| Publication number | PM819003/KM815056 |
| Year/Revision | 09/16/2011 |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Table of contents
- Transfer Case Oil Temperature Gauge Inoperative (DTC138803 and DTC138804)
- Symptom Description and Sensor Overview
- Diagnostic Procedures Using ESA (Steps 1–4)
- CVSG Data Link Wiring Verification (Step 3)
- Sensor Connector Testing and Continuity Checks (Step 5)
- Oil Temperature Sensor Resistance Table
- DTC 138803 Open Circuit Diagnosis (Step 6)
- DTC 138804 Short Circuit Diagnosis (Step 7)
Applies to
This manual applies to PACCAR trucks manufactured in 2011 and newer model years equipped with multiplexed cab instrumentation and a transfer case oil temperature gauge using a thermistor sensor. The transfer case oil temperature gauge diagnostic procedures cover all PACCAR cab variants with the listed electrical system configuration.
Who needs this transfer case oil temperature gauge manual
Diesel truck mechanics and workshop owners troubleshooting inoperative transfer case oil temperature gauge conditions in PACCAR vehicles require this manual. Technicians proficient with Electronic Service Analyst (ESA) tools will use the step-by-step diagnostic procedures to isolate faults between the thermistor sensor, wiring harness, Chassis Node connector, and cab electronic control units.
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