This 14-page Caterpillar service document provides CAT C15 PTO throttle troubleshooting procedures for diagnostic code 0030-08 (PTO Throttle Signal Invalid, FMI 08) on C15 on-highway truck engines with MXS, NKS, or RKS configurations. It details the conditions that generate the fault, system response behavior, and a complete step-by-step test sequence for the remote PTO accelerator position sensor circuit.
Official CAT C15 PTO throttle document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | DTCs — SMCS 1439-038; 1913-038 — PID 0030 FMI 08 |
| 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
- 0030-08 PTO Throttle Signal Invalid (29) — Conditions, System Response, Possible Performance Effect
- Remote PTO Accelerator Position Sensor Circuit — Test (System Operation Description)
- Test Step 1: Check the Status for the “PTO Accelerator Sensor” via Cat ET
- Test Step 2: Inspect Connectors, Pins, Sockets, Harness and Wiring
- Test Step 3: Check the Supply Voltage for the Remote Accelerator Position Sensor (11.0–13.5 VDC / 22.0–27.0 VDC)
- Test Step 5: Check Power Train Data Link Interference
- Test Step 6: Check Duty Cycle of Sensor at Breakout T (10–22% low idle, 75–90% high idle)
- Test Step 7: Check Duty Cycle of Remote Accelerator Position Sensor at ECM (P1-68)
- Test Step 8: Isolate the Sensor — Remove from Accelerator Pedal Assembly and Verify Duty Cycle
- Final Wiring Verification and Intermittent Electrical Problem Diagnosis
Applicable truck models
This document applies to Caterpillar C15 on-highway truck engines in the MXS configuration (serial prefix MXS00001-UP). The procedures also reference NKS and RKS serial prefixes within the C15 engine family. The PTO configuration must be programmed to “Remote Throttle” for these diagnostics to be relevant. The remote accelerator position sensor connects to ECM terminal P1-68 and requires a +12 V power supply from the vehicle battery. For additional CAT service resources, visit Caterpillar Support.
Who needs this CAT C15 PTO throttle manual
Diesel mechanics and workshop owners diagnosing a C15 engine stuck at low idle due to an active 0030-08 code will need this document. It is also essential when code 30-13 (PTO Throttle Out of Calibration) is active or when the remote accelerator position sensor is suspected of improper operation.
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