This document is a Cummins fault code 115 troubleshooting manual for the Engine Speed Sensor (ESS) circuit. It explains the fault description, component location, harness and connector checks, voltage and resistance tests, sensor signal verification, and final code-clearing steps for the listed Cummins ISB and QSB applications.
Official Cummins fault code 115 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB and QSB5.9 engines with Bosch VP44 fuel system; QSB engines with Bosch VP30 fuel system |
| System/Group | ISB CM550 (1990-94) / DTCs; Engine Speed Sensor (ESS) Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Unknown; extract shows Copywrite 2017 |
| Pages | 7 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 115
- PID: P190
- SPN: 190
- FMI: 2
- ENGINE SPEED SENSOR (ESS) CIRCUIT
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A) Read the fault codes using the diagnostic tool
- Step 2A) Inspect the engine harness and ECM connector pins
- Step 2B) Check for an open circuit in the +5 VDC supply wire and the signal wire
- Step 2C) Check for a short circuit to ground
- Step 2D) Check for a short circuit from pin to pin
- Step 3A) Inspect the engine speed sensor and the engine harness connectors
- Step 3B) Check ESS supply voltage
- Step 3C) Check for a signal from the ESS
- Step 3D) Inspect the nose of the sensor for damage or debris
- Step 4A) Verify Fault Code 115 is inactive
- Step 4B) Clear the inactive fault codes using the diagnostic tool
Applicable truck models
This file applies to Cummins ISB and QSB5.9 engines using the Bosch VP44 fuel system, where the engine speed sensor is located on the intake side of the engine block at crankshaft level between cylinders 4 and 5. It also covers QSB engines with the Bosch VP30 fuel system, using a combination speed and position sensor in the back of the gear housing behind the injection pump. The extract notes that QSB VP30 engines read from a tone wheel bolted to the camshaft gear, while ISB and QSB VP44 engines use separate sensors for engine speed and position. For current manufacturer information, see Cummins official website.
Who needs this Cummins fault code 115 manual
Workshop owners, diesel mechanics, and fleet technicians need this Cummins fault code 115 manual when diagnosing low power, cold-weather starting complaints, inactive related codes, or ESS circuit faults. The procedures support checks for damaged pins, corroded connectors, open circuits, shorts to ground, shorts between pins, 4.75 to 5.25 VDC supply voltage, and ESS signal fluctuation while barring the engine.
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