This 2-page PDF is an official CAT 3406E C12 troubleshooting document covering diagnostic trouble code 0105-03, which flags high voltage at the intake manifold air temperature sensor. It details the fault conditions detected by the Engine Control Module (ECM), the system response, possible performance effects, and the required diagnostic test procedure for 3406E, C-10, and C-12 on-highway truck engines.
Official CAT 3406E C12 troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (configurations 8YS, 9NS, 5DS, 1LW) |
| System / Group | Diagnostic Trouble Codes — Intake Manifold Air Temperature Sensor (SMCS 1921-038) |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- 0105-03 Intake Manifold Air Temperature Voltage High (38) — PID 0105 FMI 03
- Conditions Which Generate This Code
- System Response
- Possible Performance Effect
- Troubleshooting — Test Step 1: Engine Temperature Sensor Open or Short Circuit – Test
Applicable truck models
This document applies to Caterpillar on-highway truck engines in the 3406E, C-10, and C-12 families. The specific configuration referenced is the C-12 Truck Engine 9NS00001-UP, but coverage extends to serial prefix groups 8YS, 9NS, 5DS, and 1LW. The fault code addressed — PID 0105 FMI 03 — triggers when the ECM reads intake manifold air temperature sensor voltage above 4.9 VDC for more than eight seconds while engine coolant temperature is above −10 °C (15.0 °F) and the ECM has been powered for at least two seconds. Upon activation, the ECM defaults the intake manifold air temperature reading to 85 °C (185.0 °F), displays “DIAG” next to the status in Caterpillar Electronic Technician (ET), and turns on the cooling fan. The prescribed diagnostic path is the “Engine Temperature Sensor Open or Short Circuit – Test.” For additional technical resources, visit the Caterpillar official support page.
Who needs this CAT 3406E C12 troubleshooting manual
Fleet mechanics and independent workshop owners diagnosing a code 38 (PID 0105 FMI 03) on Caterpillar 3406E, C-10, or C-12 engines will find the exact fault conditions, ECM default behavior, and step-by-step test reference in this document. It is essential for anyone using Caterpillar Electronic Technician (ET) to resolve high-voltage intake manifold air temperature sensor faults.
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