This 14-page Caterpillar service document provides CAT C15 ambient temperature troubleshooting procedures for diagnostic trouble code 0171-11 — Ambient Air Temperature Data Lost. It details step-by-step tests of the ATA (SAE J1587/J1708) data link circuit, ECM connector inspections, battery voltage verification, and bypass harness procedures for C15 On-Highway Truck Engines (MXS configuration).
Official CAT C15 ambient temperature document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | C15 On-Highway Engine DTCs — SMCS 1439-038-AI; 1928-038; 1901-038 |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, Updated 25/02/2009 |
| Pages | 14 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0171-11 Ambient Air Temperature Data Lost — Conditions Which Generate This Code, System Response
- ATA (SAE J1587 / J1708) Data Link Circuit — Test: System Operation Description
- Test Step 1: Inspect the Electrical Connectors and the Wiring (P1 ECM connector, pull test, torque check)
- Test Step 2: Determine the Type of Problem (Cat ET communication results 1–5)
- Test Step 3: Check the Battery Voltage to the Data Link Connector (12V and 24V thresholds)
- Test Step 4: Verify Electronic Service Tool Cables and Alternate ECM Communication
- Test Step 5: Check Battery Voltage at ECM Connector (P1-48, P1-52, P1-53, P1-63, P1-65, P1-67, P1-70)
- Test Step 6: Bypass Harness Test Using 167-9225 Service Tool Adapter
- Test Step 7: Alternate Battery Test and ECM Replacement Procedure
Applicable truck models
This document applies to Caterpillar C15 On-Highway Truck Engines with the MXS configuration (serial prefix MXS00001-UP). The DTC 0171-11 is triggered when the ECM does not receive ambient air temperature data over the SAE J1587 data link and the “Allow Idle Shutdown Override” parameter is set to J1587 Outside Temp Based. Technicians working on any truck chassis equipped with this C15 engine variant will find the wiring diagrams, voltage specifications, and connector pin locations relevant. For official Caterpillar parts and service support, visit Caterpillar Support.
Who needs this CAT C15 ambient temperature manual
Diesel mechanics and fleet workshop technicians diagnosing data link communication failures, idle shutdown override malfunctions, or Cat ET connectivity issues on C15-powered trucks should reference this procedure. It is also essential when verifying ECM battery supply circuits or isolating faulty OEM vehicle wiring from engine harness problems.
The full PDF of this C15 ambient temperature troubleshooting document is available in the DiagTechPro manuals library. A free account is required to download.
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