This document is a CAT 0171-03 ambient air temperature diagnostic troubleshooting guide covering voltage-high fault code procedures for Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It details the conditions that generate diagnostic code 0171-03, the ECM system response and default values, and the corrective test steps a technician must follow to resolve the fault.
Official CAT 0171-03 ambient air temperature document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (8YS, 9NS, 5DS, 1LW prefixes) |
| System / Group | Diagnostic Trouble Codes (DTCs) — SMCS 1928-038 |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 1 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Conditions Which Generate This Code — signal voltage greater than 4.92 VDC for more than eight seconds, “Allow Idle Shutdown Override” parameter settings, ECM power-up timing
- System Response — ECM default to 65 °C (149 °F) for outside air temperature, “DIAG” status display on electronic service tool, idle shutdown override disabled while code is active
- Test Step 1 — Engine Temperature Sensor Open or Short Circuit test procedure and expected results
Applicable truck models
This troubleshooting page applies to Caterpillar on-highway truck engines in the 3406E, C-10, and C-12 families, specifically configurations with serial number prefixes 8YS, 9NS, 5DS, and 1LW. The document references the C-12 Truck Engine 9NS00001-UP configuration. These engines are widely installed in Class 8 trucks from manufacturers such as Peterbilt, Kenworth, and Freightliner. For official CAT parts lookup, technical bulletins, and service information, visit Caterpillar Support and Service Resources.
Who needs this 0171-03 ambient air temperature manual
Diesel mechanics and workshop owners diagnosing a 0171-03 voltage-high fault on CAT 3406E, C-10, or C-12 engines need this reference. It is essential for anyone troubleshooting ambient air temperature sensor circuits, verifying ECM parameter settings for idle shutdown override, or interpreting “DIAG” status flags on the electronic service tool.
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