SPN 641 - FMI 11 (Fault Code 2635)
SPN 641 FMI 11
SPN641 FMI11
VGT Actuator Driver Circuit - Condition Exists
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| ISB, ISC, and ISL - VGT Actuator Circuit |
Fault Code: 2635
PID(P), SID(S): S027
SPN: 641
FMI: 11/31
Lamp: Red
REASON: VGT Actuator Driver Circuit - Condition Exists. A calibration mismatch between the VGT
actuator and the ECM has been detected.
EFFECT: VGT actuation will be disabled.
Circuit Description:
The variable geometry turbocharger (VGT) is electronically activated by the VGT actuator. The VGT actuator is a smart device that receives information via the J1939 datalink from the primary engine electronic control module (ECM). The VGT actuator performs its own diagnostics and reports errors back to the primary engine ECM using the J1939 datalink.
Component Location:
The VGT actuator is located on the turbocharger bearing housing.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes:
• The ECM has detected a calibration incompatibility between the VGT actuator and the ECM calibration.
• The VGT actuator has detected that the system voltage is incorrect for the installed VGT actuator part number.
• The ECM has detected an incorrect VGT actuator installed on the turbocharger.
Action Taken When the Fault Code is Active:
• The ECM illuminates the red STOP ENGINE light immediately when the diagnostic runs and fails.
• VGT actuation will be disabled.
Conditions for Clearing the Fault Code:
The diagnostic will clear at initial key-on if the error condition no longer exists. The ECM will turn off the red STOP ENGINE light and enable VGT operation immediately after the diagnostic runs and passes.
Shop Talk:
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM.
This fault code is logged when the ECM has detected that an incorrect VGT actuator has been installed on the turbocharger.
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