This Cummins code 778 troubleshooting document covers Fault Code 778 for the engine camshaft speed/position sensor circuit. It explains the circuit description, fault conditions, ECM actions, clearing conditions, associated procedures, and guided electrical checks for the PDF file Code 778.pdf.
Official Cummins code 778 troubleshooting document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250; also listed with ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, and other CM2220, CM2150, and CM876 engines in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Engine Camshaft Speed/Position Sensor Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 associated procedure entries |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 20-Jan-2011 |
| Pages | 19 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 778 – Engine Camshaft Speed/Position Sensor – Data Erratic, Intermittent, or Incorrect
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 3 – Check the camshaft position sensor circuit.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
The extract identifies Cummins ISB6.7 CM2250 as the main model coverage for this file and lists the same Fault Code 778 procedure across ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, ISF2.8 CM2220, ISF3.8 CM2220, ISB4.5, ISB6.7, ISD4.5, ISD6.7 CM2150, ISL8.9 CM2150, ISM11 CM876, and ISZ13 CM2150. The fault relates to loss of signal from the camshaft speed/position sensor while the engine is running, with possible reduced engine performance or reduced starting capability while the engine uses the primary engine position sensor. See the manufacturer at Cummins official website.
Who needs this Cummins code 778 troubleshooting manual
This Cummins code 778 troubleshooting manual is for technicians diagnosing an amber CHECK ENGINE lamp, SPN 723 FMI 2, or an intermittent camshaft position sensor signal on supported Cummins electronic engines. It is useful when checking 5 volt supply, sensor return, signal wiring, ECM and engine harness connector pins, air gap, sensor damage, metal debris, shorts, open circuits, and ECM calibration with INSITE™ electronic service tool.
The document states that causes can include an open or short circuit in the 5 volt supply, signal, or return wire, a damaged or malfunctioning camshaft position sensor, a damaged speed indicator lobe, or incorrect sensor air gap. Guided checks include measuring for 4.75-VDC to 5.25-VDC, confirming less than 10 Ohms on the signal circuit, inspecting for corroded, bent, broken, pushed back, expanded, wet, dirty, or poorly sealed connector pins, and replacing the engine wiring harness or camshaft position sensor when the test result identifies that failure.
Full PDF available in the DiagTechPro manuals library, free account required to download.
Related manuals library
Sản phẩm liên quan cho hãng này
Cùng brand theo taxonomy hiện có trong catalog WooCommerce.
Cummins INSITE 9.3 – The Essential Diagnostic Tool for Cummins Engines
Cummins Calterm Version 5.16 – Advanced ECM Control and Precision Tuning for Cummins Engines
Cummins InCal CE – The Calibration and Configuration Tool for Cummins Engines
