SPN 641 - FMI 15 (Fault Code 1962)
SPN641 FMI15
VGT Actuator Driver Over Temperature (Calculated) - Data Valid but Above Normal Operational Range - Least Severe Level
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| VGT Actuator Circuit |
CODES:
Fault Code: 1962
PID(P), SID(S): S027
SPN: 641
FMI: 0/15
Lamp: Amber
REASON: VGT Actuator Driver Over Temperature (Calculated) - Data Valid but Above Normal
Operational Range - Least Severe Level. High Internal VGT actuator temperature has been detected.
EFFECT: None on performance.
Circuit Description:
The variable geometry turbocharger (VGT) is electronically activated by the VGT actuator. The VGT actuator is a smart device and receives information via the J1939 datalink from the primary engine electronic control module (ECM). The VGT actuator performs its own diagnostics and reports failures 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:
The diagnostic runs continuously when the keyswitch is turned on.
Conditions for Setting the Fault Codes:
The fault code will log when the internal temperature of the VGT actuator exceeds 125°C [257°F] continuously for 30 minutes.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light immediately after the internal actuator temperature drops below 125°C [257°F].
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 will log when the internal temperature of the VGT actuator exceeds 125°C [257°F].
This fault code will be inactive when the vehicle is in the shop because the VGT actuator temperature has cooled down.
Troubleshoot multiple inactive counts of this fault code as an active fault code.
Also check for exhaust leaks blowing on the VGT actuator. Repair any external leaks.
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