This Cummins ISB6.7 1866 document is a troubleshooting manual for Fault Code 1866 on CM2150 engines. It explains the EGR differential pressure sensor circuit, the conditions that set the amber CHECK ENGINE light, and guided tests using INSITE™ electronic service tool.
Cummins ISB6.7 1866: Official Cummins ISB6.7 1866 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Differential Pressure Sensor Circuit; Exhaust Gas Recirculation Valve Delta Pressure |
| Publication no. | Not shown |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 13 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Cummins ISB6.7 1866: Document table of contents
- Overview
- Circuit Description
- FAULT CODE 1866
- Component Location
- Conditions for Running the Diagnostics
- 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 for sensor circuit fault codes.
- Guided Step 2 – Check the EGR delta pressure sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL engines with CM2150 control, including the ISB6.7 CM2150 coverage shown for 2007-09. The procedure is written around the EGR differential pressure sensor near the air intake, the EGR differential pressure sensor flow ports, the ECM connector, and the engine harness. For brand information, visit Cummins official website.
Who needs this ISB fault code manual
Workshop owners, diesel mechanics, and fleet technicians need this ISB fault code manual when diagnosing Fault Code 1866, PID P411, SPN 411, FMI 2/2. The manual supports checks for active Fault Codes 2273 and 2274, soot blockage in flow port cross-drillings, damaged connector pins, high resistance, short circuits, sensor replacement, ECM authorization steps, and final fault clearing.
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