This 13-page PDF is a CAT C15 temperature sensor troubleshooting document covering diagnostic code 0105-04 (Intake Manifold Air Temperature voltage low) for C15 On-Highway Truck Engines with MXS configuration. It provides step-by-step electrical test procedures for identifying open and short circuits in the intake manifold air temperature sensor, coolant temperature sensor, ambient air temperature sensor, and fuel temperature sensor wiring and connectors.
Official CAT C15 temperature sensor troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | C15 (MXS, NKS, or RKS) / DTCs — SMCS 1439-038-AI; 1921-038 |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, Updated 25/02/2009 |
| Pages | 13 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0105-04 Intake Manifold Air Temperature Voltage Low (38) — Conditions Which Generate This Code, System Response
- Engine Temperature Sensor Open or Short Circuit — Test (covers DTCs 105-03, 105-04, 110-03, 110-04, 171-03, 171-04, 174-03, 174-04)
- Pull-up Voltage explanation and schematics (Illustrations 1–5)
- P2 and P1 ECM connector pin assignments and sensor locations
- 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 — final diagnosis and ECM replacement
Applicable truck models
This document applies to the Caterpillar C15 On-Highway Truck Engine, specifically the MXS configuration (serial numbers MXS00001 and up). The procedures also reference NKS and RKS serial prefixes within the C15 engine family. The guide addresses the intake manifold air temperature sensor circuit but uses a shared diagnostic procedure that is identical for coolant temperature, ambient air temperature, and fuel temperature sensors. ECM connector pinouts reference P2 terminals (P2-13, P2-30, P2-56, P2-62) and P1 terminals (P1-18, P1-26). For official Caterpillar parts and service resources, visit Caterpillar Support.
Who needs this CAT C15 temperature sensor troubleshooting manual
Diesel mechanics, fleet workshop technicians, and independent repair shops working on CAT C15-powered trucks need this manual when DTC 0105-04 or related temperature sensor voltage codes appear. It is essential for anyone using Caterpillar Electronic Technician (Cat ET) software to systematically diagnose open or short circuit faults in engine temperature sensor wiring.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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