This CAT C15 throttle code document is a Caterpillar troubleshooting procedure for diagnostic code 0091-08 Throttle Position Invalid (32). It explains the ECM response, Cat ET status checks, accelerator pedal position sensor circuit testing, wiring inspection, and 8 volt sensor supply checks for the C15 On-Highway Truck MXS configuration.
Official CAT C15 throttle code document details
| Brand | CAT |
|---|---|
| Model coverage | C15 On-Highway Truck MXS00001-UP |
| 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
- 0091-08 Throttle Position Invalid (32)
- 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 Pedal Assembly
- Disconnect the 8 Volt Sensor while you Monitor the Active Diagnostic Codes
- ECM supply voltage and harness repair checks
Applicable truck models
This file applies to the Product: TRUCK ENGINE, Model: C15 TRUCK ENGINE MXS, Configuration: C15 On-Highway Truck MXS00001-UP. The sampled pages identify C15 On-highway Engines and the accelerator pedal position sensor circuit used by the ECM, including P1-4 sensor supply, P1-5 sensor return, and P1-66 accelerator pedal position sensor wiring. For manufacturer information, visit Caterpillar official site.
Who needs this CAT C15 throttle code manual
Workshop owners, diesel technicians, and fleet mechanics need this manual when a CAT C15 engine stays at low idle, Cat ET displays “DIAG” next to Throttle Position, or codes 41-03, 41-04, 91-08, or 91-13 are being diagnosed. It is useful for checking PWM duty cycle, 8 VDC supply voltage, connector condition, ECM inputs, and whether PTO mode or unprogrammed parameters are affecting throttle response.
The procedure states that the ECM sets Throttle Position to 0% when the accelerator pedal position sensor signal frequency is below 150 Hz or above 1050 Hz for more than two seconds after ECM power-up. It gives expected duty cycle ranges of 10 to 22 percent at released pedal position and 75 to 90 percent at fully depressed position, plus repair direction for sensor faults, pedal assembly issues, signal wire faults, supply wire faults, and possible ECM replacement using a test ECM.
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