This Cummins 2636 troubleshooting document covers Fault Code 2636 for the VGT Actuator Driver Circuit on ISB, ISC, and ISL CM2150 engines. It explains the abnormal update rate fault, J1939 communication checks, VGT actuator power checks, ECM harness tests, aftertreatment inspection, and fault clearing steps.
Official Cummins 2636 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL; ISB6.7 CM2150 (2007-09) coverage from file group |
| System/Group | DTCs; VGT Actuator Circuit; J1939 data link |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 and 08-Dec-2010 |
| Pages | 21 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- 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 the fault codes.
- Guided Step 2 – Check the VGT actuator 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 engine applications using the VGT actuator circuit described in the procedure, including the ISB6.7 CM2150 (2007-09) group listed for this file. The procedure refers to the VGT actuator on the turbocharger bearing housing, the primary engine ECM, the engine harness, the OEM power harness, and the SAE J1939 data link between the ECM and the smart VGT controller. For manufacturer information, visit Cummins official website.
Who needs this Cummins 2636 troubleshooting manual
Mechanics and workshop owners need this Cummins 2636 troubleshooting manual when a red STOP ENGINE lamp is linked to Fault Code 2636, SPN 641, FMI 9/9. It is useful for checking VGT actuator connectors, power and return circuits, J1939 termination resistance, open circuits, short circuits, ECM supply voltage, and required aftertreatment inspection after repair.
The diagnostic states that Fault Code 2636 is logged when the primary engine ECM does not receive a valid J1939 message from the VGT actuator for more than 1 second. The document lists possible causes such as no actuator power from the ECM, an open return circuit, J1939 data link open or short circuits, intermittent communications, rapid keyswitch cycling, connector pin location issues, a damaged termination resistor, or a damaged engine ECM. The workflow uses INSITE™ electronic service tool checks, resistance measurements, voltage measurements, connector inspections, and repair decisions for the VGT actuator, engine harness, termination resistor, ECM calibration, or ECM replacement authorization.
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