This Code 778 document explains Fault Code 778 for the engine camshaft speed/position sensor circuit on CM2150 engines. It covers the circuit description, diagnostic conditions, troubleshooting steps, connector inspections, voltage checks, air gap verification, ECM calibration review, and fault clearing with INSITE™ electronic service tool.
Official Code 778 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Engine Magnetic Speed/Position Circuit |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 15 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 778
- 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 2 – Check the camshaft position sensor and connector.
- Guided Step 3 – Check the camshaft position sensor circuit.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL engines with CM2150 control, including the ISB6.7 CM2150 (2007-09) coverage stated in the file group. The document is for Fault Code 778, PID S064, SPN 723, FMI 2/2, where the ECM detects an error or loss of the camshaft position sensor signal for more than 1 second. The extract identifies both engine position sensors on the back side of the front gear housing above the fuel pump drive. For manufacturer information, visit Cummins official website.
Who needs this Code 778 manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this ISB6.7 fault code manual when checking rough running, poor starting capability, amber CHECK ENGINE light activity, or intermittent camshaft position sensor faults. It is useful for testing the 5 volt SUPPLY, SIGNAL, and RETURN circuits, inspecting ECM and engine harness connector pins, measuring 4.75 to 5.25-VDC supply voltage, checking resistance below 10 ohms, and confirming camshaft position sensor air gap before replacement or harness repair.
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