This document is a CAT C15 110-04 troubleshooting guide covering diagnostic code 0110-04 (Coolant Temperature voltage low) for C15 On-Highway Truck Engines with MXS configuration. It provides the conditions that generate the code, the ECM system response, and a complete step-by-step test procedure to isolate faults in the engine temperature sensor circuit.
Official CAT C15 110-04 document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | Engine Temperature Sensors — DTCs 0110-04, 0110-03, 0105-03, 0105-04, 0171-03, 0171-04, 0174-03, 0174-04 |
| 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
- 0110-04 Coolant Temperature voltage low (27) — Conditions Which Generate This Code
- System Response (default to 90 °C / 194 °F, cooling fan activation, check engine lamp behavior)
- Engine Temperature Sensor Open or Short Circuit – Test (covers coolant, intake manifold air, ambient air, and fuel temperature sensors)
- Pull-up Voltage explanation and sensor circuit schematic
- ECM connector pin assignments (P1 and P2)
- Sensor locations illustrations
- Test Step 1 — Inspect Electrical Connectors and Wiring
- Test Step 2 — Check for Active Diagnostic Codes using Cat ET
- Test Step 3 — Disconnect the Suspect Sensor to Create an Open Circuit
- Test Step 4 — Pull-up Voltage at the Sensor Connector (expected 5.5 ± 0.5 VDC)
- Test Step 5 — Check the Signal Wire for a Short Circuit (resistance threshold 20,000 Ohms)
- Test Step 6 — Create a Short at the Suspect Sensor Connector
- Test Step 7 — Check the Operation of the ECM
Applicable truck models
This troubleshooting procedure applies to the Caterpillar C15 On-Highway Truck Engine, specifically the MXS serial number prefix (MXS00001-UP). The document references temperature sensor diagnostics that are identical across the coolant, intake manifold air, ambient air, and fuel temperature sensor circuits on this engine platform. It uses the P1 and P2 ECM connectors with specific pin locations documented for each sensor. For additional product support and parts information, visit Caterpillar’s official support page.
Who needs this CAT C15 110-04 manual
Diesel mechanics and workshop owners diagnosing a check engine lamp or DTC 0110-04 on a C15 engine need this guide. It is also essential for technicians working with Caterpillar Electronic Technician (Cat ET) who must systematically verify sensor circuits, harness integrity, and ECM operation through the seven documented test steps.
The full 12-page PDF is available in the DiagTechPro manuals library, free account required to download.
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