This document is a CAT C15 8 Volt Supply troubleshooting procedure for diagnostic code 0041-04 (8 Volt Supply voltage low, FMI 04) on C15 On-Highway Truck Engines with MXS, NKS, or RKS configurations. It provides step-by-step test procedures for diagnosing low 8 VDC sensor supply issues and accelerator pedal position sensor circuit faults. The guide was published by Caterpillar under media number RENR5088-10.
Official CAT C15 8 Volt Supply document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System/Group | C15 On-Highway Engines — Diagnostic Trouble Codes (DTCs), SMCS 1439-038 |
| Publication no. | RENR5088-10 |
| Year/Revision | Published 01/02/2009, Updated 25/02/2009 |
| Pages | 13 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0041-04 8 Volt Supply Voltage Low (FMI 04) — Conditions, System Response, Possible Performance Effect
- Accelerator Pedal (Throttle) Position Sensor Circuit — Test (covers DTCs 41-03, 41-04, 91-08, 91-13)
- Test Step 1: Monitor the Status for the Accelerator Pedal Position
- Test Step 2: Check the Duty Cycle at the ECM Connector (implied)
- Test Step 3: Inspect the Electrical Connectors and the Wiring
- Test Step 5: Check the Duty Cycle at the Sensor
- Test Step 6: Verify Signal Reaching the ECM
- Test Step 7: Accelerator Pedal Assembly and Sensor Evaluation
- Test Step 8: Disconnect the 8 Volt Sensor While Monitoring Active Diagnostic Codes
- Test Step 9: Measure 8 VDC Supply at P1-4 ECM Connector
Applicable truck models
This troubleshooting procedure applies to the Caterpillar C15 On-Highway Truck Engine, specifically the MXS configuration (serial prefix MXS00001-UP). The document group also references NKS and RKS serial prefixes for the C15 platform. These engines are commonly found in Class 8 heavy-duty trucks from multiple OEMs. The procedure references the J1/P1 ECM connector pinout (P1-4 sensor supply 8 VDC, P1-5 sensor return, P1-66 accelerator pedal position sensor signal) and the 7X-6370 Adapter Cable for breakout testing. For additional Caterpillar parts and technical resources, visit Caterpillar Support.
Who needs this CAT C15 8 Volt Supply manual
Diesel mechanics and workshop owners troubleshooting a check engine lamp caused by DTC 0041-04 on a C15 engine need this guide. It is essential for anyone diagnosing accelerator pedal position sensor failures, low idle limitations, or 8 VDC supply circuit faults using Cat Electronic Technician (Cat ET) and a multimeter capable of reading duty cycle.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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