Engine Speed Surges Under Load or In Operating Range

ENGINE SPEED SURGES UNDER LOAD OR IN OPERATING RANGE


POSSIBLE CAUSES
- Possible causes

Diagnostic Test

1. POSSIBLE CAUSES
This is a list of possible causes:
Check for any TSBs for ECM calibration updates that my apply.
Fuel level low.
Fuel filter plugged.
Poor quality or improper grade of fuel.
Fuel tank venting.
Low fuel pressure.
Air in fuel system
Fuel Lift Pump malfunctioning.
Fuel Inlet restriction.
Fuel line kinked or restricted.
Fuel return passage or fuel return line kinked or restricted.
Injectors are incorrect.
Injector shim thickness is incorrect.
Injector malfunction.
Fuel connector leaking fuel.
Accelerator pedal is restricted or out of calibration.
Crankshaft position sensor (CKP) or Camshaft position sensor (CMP) and/or circuit malfunction.
Vehicle Speed sensor (VSS) and/or circuit malfunction.
Incorrect Transmission Clutch operation.
Check vehicle brakes for dragging, transmission malfunction, cooling fan operation cycle time and engine driven devices.
Check for proper turbocharger, turbo charger wheel clearance is out of specifications, waste gate for correct operation.
Bus communication problems.
Moisture in harness connectors or corroded terminals.
Internal engine damage.
Fuel control actuator
Speed indicator ring
Pressure Limiting valve
Air inlet restriction
External fuel leaks
Injector circuit
High pressure fuel pump

View repair
Repair
Repair as necessary. Refer to Service Information for the related symptom(s).
Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1