This fuel temperature DTCs troubleshooting guide provides the complete diagnostic procedure for code 0174-04 (Fuel Temperature voltage low) on Caterpillar C15 On-Highway Truck Engines (MXS configuration). The 12-page document walks technicians through a structured, step-by-step fault isolation process covering sensor inspection, pull-up voltage verification, short and open circuit testing, and ECM operation checks.
Official fuel temperature DTCs document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | Engine Temperature Sensors / DTCs (SMCS 1439-038-TA; 1922-038; 1906-038; 1921-038; 1928-038) |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, Updated 25/02/2009 |
| Pages | 12 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0174-04 Fuel Temperature Voltage Low (13) — Conditions Which Generate This Code, System Response
- Engine Temperature Sensor Open or Short Circuit — Test (System Operation Description)
- Pull-up Voltage explanation and schematics (Illustrations 1–5)
- P2 and P1 ECM connector pinouts — signal, common, and sensor identification
- Sensor locations — fuel temperature sensor, intake manifold air temperature sensor, coolant temperature sensor
- Test Step 1: Inspect Electrical Connectors and Wiring (45 N pull test, torque check at 6.0 N·m)
- Test Step 2: Check for Active Diagnostic Codes using Caterpillar Electronic Technician (Cat ET)
- Test Step 3: Disconnect the Suspect Sensor to Create an Open Circuit
- Test Step 4: Check Pull-up Voltage at Sensor Connector (5.5 ± 0.5 VDC)
- Test Step 5: Check Signal Wire for Short Circuit (resistance measurement)
- Test Step 6: Create a Short at the Suspect Sensor Connector (jumper wire test)
- Test Step 7: Check the Operation of the ECM (open/short simulation at ECM connector)
Applicable truck models
This document applies to the Caterpillar C15 On-Highway Truck Engine, configuration MXS00001-UP. The troubleshooting procedure addresses diagnostic code 0174-04 specifically but also covers related temperature sensor codes: 105-03, 105-04 (intake manifold air temperature), 110-03, 110-04 (coolant temperature), 171-03, 171-04 (ambient air temperature), and 174-03 (fuel temperature voltage high). The ECM detects a fault when the fuel temperature sensor signal falls below 0.2 VDC for more than eight seconds and defaults to the lower of engine coolant temperature or 50 °C (122 °F). For additional product support, visit Caterpillar’s official support page.
Who needs this fuel temperature DTCs manual
Diesel mechanics and workshop owners servicing Caterpillar C15 MXS truck engines will use this guide whenever a 0174-04 diagnostic code appears. The seven structured test steps — from connector inspection through ECM replacement — ensure systematic fault isolation without unnecessary parts replacement.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
Related manuals library
Sản phẩm liên quan cho hãng này
Cùng brand theo taxonomy hiện có trong catalog WooCommerce.
CAT Perkins Pack – Premium Power & Performance by Caterpillar
CAT SIS
