This document is a CAT 0091-13 throttle calibration troubleshooting guide covering diagnostic code 0091-13 (Throttle Position out of calibration) for Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It details the conditions that generate the fault code, the ECM system response, and the required test procedure to resolve the issue. The guide is published by Caterpillar Inc. under media number RENR1328-08.
Official CAT 0091-13 throttle calibration document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-12 Truck Engine 9NS; 3406E, C-10, C-12 On-highway Engines (8YS, 9NS, 5DS, 1LW) |
| System/Group | Troubleshooting — DTC 0091-13 Throttle Position / SMCS 1913-038 |
| 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 (DTC 0091-13)
- System Response — ECM behavior when fault is active
- Test Step 1: Accelerator Pedal (Throttle) Position Sensor Circuit — Test Results
Applicable truck models
This troubleshooting document applies to Caterpillar truck engines in the 3406E, C-10, and C-12 families used in on-highway applications. Specific serial prefix coverage includes 8YS, 9NS, 5DS, and 1LW configurations, with the C-12 Truck Engine 9NS00001-UP explicitly referenced. Workshops servicing any of these engine series should keep this guide accessible for accelerator pedal position sensor diagnostics. For additional technical resources, visit Caterpillar’s official support page.
Who needs this 0091-13 throttle calibration manual
Diesel mechanics and workshop owners diagnosing an engine stuck at low idle due to a throttle position fault on 3406E, C-10, or C-12 engines need this reference. It is essential when the electronic service tool displays “DIAG” next to Throttle Position status, indicating the ECM has set throttle to 0 percent after detecting an accelerator pedal duty cycle outside the 5–95 percent range for more than two seconds.
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