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PACCAR PX-8 CM2150 (2007-09) Fault Code: 3616 PID: SPN: 2633 FMI: VGT Actuator Position – Special Instructions.

Verify the ECM calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable corrections to the calibration stored in the ECM. If necessary, calibrate the ECM.

This is an informational fault code indicating that the VGT actuator was unable to go to the desired position at key ON. While active, the ECM will continuously attempt to restore normal VGT operation until the engine coolant temperature reaches 74°C [165°F].

If the condition continues to exist after the coolant reaches 74°C [165°F], Fault Code 2387 will become active and Fault Code 3616 will become inactive. Fault Code 2346 may set due to a resulting fueling derate.

Inspect the turbocharger vanes for residue, and clean the vanes, if required. Find the source of the residue and repair.

Possible repairs:

1)Inspect the grid heater for damage or plugging. If found damaged, replace the grid heater and inspect the air handling system for debris.
2)Replace the turbocharger assembly.
3)If necessary, calibrate the ECM.

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