This document is a C15 speed sensor DTCs troubleshooting guide for diagnosing diagnostic trouble code 0064-08 (Secondary Engine Speed Loss of Signal) on C15 on-highway truck engines with MXS, NKS, or RKS configurations. Published by Caterpillar as media number RENR5088-10, it provides step-by-step test procedures for the engine speed/timing sensor circuit, including resistance measurements, wiring inspections, and ECM verification.
Official C15 speed sensor DTCs troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | Engine Speed/Timing Sensors — SMCS 1439-038-VF; 1912-038 |
| 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
- 0064-08 Secondary Engine Speed Loss of Signal (34) — Conditions, System Response
- Engine Speed/Timing Sensor Circuit — Test: System Operation Description
- Test Step 1: Check for Active Diagnostic Codes
- Test Step 2: Check the Installation of the Sensor Assembly
- Test Step 3: Inspect the Electrical Connectors and the Wiring
- Test Step 4: Measure Resistance Through the Engine Harness (1000–1200 Ohms specification)
- Test Step 5: Measure the Resistance of the Sensor
Applicable truck models
This troubleshooting procedure applies to the Caterpillar C15 on-highway truck engine, configuration MXS00001-UP. It addresses DTCs 0064-08 (secondary engine speed loss of signal), 190-08 (primary engine speed loss of signal), and 22-11 (primary to secondary engine speed signal calibration). The engine uses two magnetic speed/timing sensors: the primary sensor monitors the crankshaft gear timing ring and the secondary sensor monitors the camshaft gear timing ring. These sensors are not interchangeable. The procedure requires Caterpillar Electronic Technician (Cat ET) software for diagnostics. For official Caterpillar service resources, visit Caterpillar Support.
Who needs this C15 speed sensor DTCs troubleshooting manual
Diesel mechanics and workshop owners servicing C15-powered trucks will need this manual when the check engine lamp illuminates due to DTC 0064-08 or when the engine experiences rough running at startup, extended crank times, or unexpected shutdowns caused by loss of both speed sensor signals. It walks through sensor installation checks, connector and wiring inspections, pull tests, resistance measurements, and ECM substitution testing.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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