This document provides comprehensive diagnostic procedures for PACCAR fuel filter restriction DTC 1603 and DTC 1604, which indicate an inoperative fuel filter restriction pressure gauge. Published by PACCAR for their electrical system service, this manual is designed for technicians using the Electronic Service Analyst (ESA) hardware and software diagnostic tool to troubleshoot multiplexed instrumentation problems on PACCAR trucks.
Document details and specifications — PACCAR fuel filter
| Brand | PACCAR |
| Model coverage | 2011 and newer PACCAR trucks |
| 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
- Fuel Filter Restriction Pressure Gauge Inoperative – DTC 1603 and DTC 1604
- Diagnostic procedures using ESA (Electronic Service Analyst)
- Gauge graphic monitoring and simulation steps
- CVSG data link wiring checks and daisy chain verification
- Active DTC diagnosis and voltage testing procedures
- Sensor ground, input voltage, and output voltage checks
- Chassis Node connector pinout reference
- Resistance testing and short/open circuit identification
- Sensor replacement and component verification
Applies to these models
This manual covers PACCAR trucks manufactured in 2011 and newer equipped with electronic fuel filter restriction pressure gauges connected to the cab electrical system via CVSG data link wiring. The diagnostic procedures address both DTC 1603 (open in application air pressure circuit) and DTC 1604 (short in application air pressure circuit) fault codes. For official PACCAR specifications and additional technical resources, visit PACCAR official.
Who needs this PACCAR fuel filter restriction manual
Diesel truck mechanics and workshop technicians diagnosing fuel filter restriction require this manual to systematically isolate faults in the electronic transducer sensor, CVSG data link wiring, Chassis Node connector, and CECU components. The step-by-step procedures using ESA diagnostic software enable rapid identification of whether the problem originates in wiring continuity, sensor voltage output, or component failure.
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