This Cummins 2636 troubleshooting DTCs document is a fault-code diagnostic manual for the VGT actuator driver circuit. It explains Fault Code 2636, the abnormal update rate condition, likely causes, guided electrical checks, J1939 data link testing, calibration review, and repair validation for Cummins CM2250 engines.
Official Cummins 2636 troubleshooting DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISX11.9 CM2250 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; VGT Actuator Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 associated procedures |
| Year/Revision | Last Modified: 04-Jan-2011 and 10-Jan-2011 |
| Pages | 20 |
| File size | 0.2 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 and circuit.
- Guided Step 3 – Check the engine wiring harness.
- Guided Step 4 – Check the J1939 data link.
- Guided Step 6B – Disable the fault code.
Applicable truck models
This file applies to Cummins CM2250 engine diagnostics where Fault Code 2636 is used for the VGT Actuator Driver Circuit – Abnormal Update Rate. The extract identifies ISB6.7 CM2250 as the main coverage and lists related procedure coverage for ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISX11.9 CM2250. It concerns the electronically activated variable geometry turbocharger actuator, the primary engine ECM, the SAE J1939 data link, power supply and return circuits, engine harness connectors, OEM harness interconnects, aftertreatment NOx sensor disconnect steps, diesel exhaust fluid controller power-down precautions, and terminating resistance checks. For official product information, visit Cummins official website.
Who needs this Cummins 2636 troubleshooting DTCs manual
Workshop technicians, fleet mechanics, and diagnostic-tool users need this file when the red STOP ENGINE lamp or MIL is triggered and INSITE™ electronic service tool shows an active or high-count inactive Fault Code 2636. The procedure is useful for checking VGT actuator connector pins, battery voltage within 1-VDC of battery voltage, Electrical System Voltage parameter settings, open or short circuits, resistance values such as less than 10 ohms and greater than 100k ohms, 110 to 130 ohms terminating resistance, ECM calibration code status, and the final inactive-fault validation after one minute of idle operation.
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