This document is a coolant temperature DTCs troubleshooting guide for diagnostic code 0110-03 (Coolant Temperature Voltage High) on C15 on-highway truck engines with MXS, NKS, or RKS prefix serial numbers. It provides the conditions that generate the code, the ECM system response, and a complete seven-step diagnostic procedure covering sensor inspection, pull-up voltage checks, and signal wire short circuit testing.
Official coolant temperature DTCs document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | Engine Temperature Sensors — DTCs 0110-03, 0110-04, 105-03, 105-04, 171-03, 171-04, 174-03, 174-04 |
| 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
- 0110-03 Coolant Temperature Voltage High (27) — Conditions Which Generate This Code, System Response
- Engine Temperature Sensor Open or Short Circuit — Test (covers intake manifold air, coolant, ambient air, and fuel temperature sensors)
- Pull-Up Voltage explanation and schematic (Illustrations 1–5)
- P2 and P1 ECM connector pin assignments
- Sensor locations (fuel temperature, intake manifold air temperature, coolant temperature)
- 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: Check the Pull-Up Voltage at the Sensor Connector (5.5 ± 0.5 VDC)
- Test Step 5: Check the Signal Wire for a Short Circuit (resistance greater than 20,000 Ohms)
- Test Step 6: Create a Short at the Suspect Sensor Connector with jumper wire
- Test Step 7: Check the Operation of the ECM
Applicable truck models
This troubleshooting procedure applies to the Caterpillar C15 on-highway truck engine, configuration MXS00001-UP. The same sensor test procedure also covers intake manifold air temperature, ambient air temperature, and fuel temperature sensors sharing the identical passive-sensor circuit design on C15 engines. For additional product support and parts information, visit Caterpillar Support.
Who needs this coolant temperature DTCs manual
Diesel mechanics and workshop owners diagnosing a check engine lamp caused by DTC 0110-03 on a C15 engine need this manual. It walks through every step from connector inspection to ECM replacement, with exact voltage thresholds, resistance specifications, and Cat ET instructions required for accurate fault isolation.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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