This document is a CAT C15 throttle position troubleshooting manual for diagnostic code 0091-13, covering throttle position out of calibration on the C15 On-Highway Truck MXS engine. It explains the ECM response, Cat ET status checks, accelerator pedal position sensor circuit testing, duty cycle checks, wiring inspections, and ECM supply voltage checks.
Official CAT C15 throttle position document details
| Brand | CAT |
|---|---|
| Model coverage | C15 On-Highway Truck MXS00001-UP; C15 Truck Engine MXS |
| System/Group | C15 (MXS, NKS, or RKS) / DTCs; accelerator pedal position sensor circuit |
| Publication no. | RENR5088-10 |
| Year/Revision | Publication Date 01/02/2009; Date Updated 25/02/2009 |
| Pages | 12 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0091-13 Throttle Position out of calibration (28)
- Conditions Which Generate This Code
- System Response
- Accelerator Pedal (Throttle) Position Sensor Circuit – Test
- System Operation Description
- Monitor the Status for the “Accelerator Pedal Position”
- Inspect the Electrical Connectors and the Wiring
- Check the Duty Cycle at the Sensor
- Remove the Sensor from the Accelerator Pedal Assembly
- Disconnect the 8 Volt Sensor while you Monitor the Active Diagnostic Codes
- 8 Volt Sensor Supply voltage check and ECM test procedure
Applicable truck models
This file applies to the Product: TRUCK ENGINE, Model: C15 TRUCK ENGINE MXS, Configuration: C15 On-Highway Truck MXS00001-UP. The extract identifies the troubleshooting publication for C15 On-highway Engines and specifically covers diagnostic codes including 41-03 8 Volt Supply voltage high, 41-04 8 Volt Supply voltage low, 91-08 Throttle Position Invalid, and 91-13 Throttle Position out of calibration. For manufacturer information, visit Caterpillar.
Who needs this CAT C15 throttle position manual
This manual is useful for diesel mechanics, fleet technicians, and workshop owners diagnosing a C15 engine that remains at low idle while the code is active. It supports fault tracing with Caterpillar Electronic Technician, a duty-cycle multimeter, ECM connector checks, and harness repair decisions.
The procedure describes how the accelerator pedal position sensor sends a PWM signal to the Engine Control Module, with sensor supply from P1-4, sensor return at P1-5, and the accelerator pedal position sensor signal at P1-66. It includes expected duty cycle ranges of 10 to 22 percent with the pedal released and 75 to 90 percent with the pedal fully depressed. The document also notes that an incorrectly calibrated pedal assembly cannot be adjusted and that the entire pedal assembly must be replaced if required.
Later checks cover the firewall bulkhead connector, J1/P1 ECM connector, sensor connector terminals A, B, and C, a 45 N pull test, and an 8.0 ± 0.4 VDC supply measurement. Repair paths include verifying PTO mode and programmed parameters, inspecting intermittent electrical connector faults, replacing the accelerator pedal position sensor, referring pedal assembly replacement to the OEM dealer, or temporarily connecting a test ECM when the correct signal reaches the ECM but the fault remains.
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