Section 12.2 Low Horsepower Troubleshooting Chart

Section 12.2
Low Horsepower Troubleshooting Chart

There are three basic checks that should be performed:‪

  • Check for active/historic codes. All causes need to be checked once the fault is identified. Record faults on the Application For Adjustment (AFA) claim, if there is to be a claim.
  • Check the DDEC parameters, progressive shift settings, torque limiting values, and injector codes. Are they correct? Is proper rating applied? If vehicle is new, is it spec'd correctly?
  • Check that the dyno-measured power is within DDC specifications as Listed in Table "Minimum Acceptable Wheel HP" for minimum acceptable wheel HP data. Record data on AFA claim.

Note: Service information letter instructions published following the date of this document take precedence.

Possible causes of low power and symptoms are listed in Table "Low Power Troubleshooting Chart" .‪

Possible Causes‪

Symptoms‪

Loss of Power‪

Misfires‪

Poor‪

Acceleration‪

Erratic Idle‪

Engine Dies‪

Black Smoke‪

Excessive Oil‪

Consumption‪

Fuel Filter Restriction refer to "12.1 Factors That Affect Wheel Horsepower"

X‪

X‪

X‪

—‪

X‪

—‪

—‪

Fuel Shut-Off Valve not Open refer to "12.1 Factors That Affect Wheel Horsepower"

X‪

X‪

X‪

X‪

—‪

—‪

—‪

Air in the Fuel refer to "12.3 Aerated Fuel"

X‪

X‪

X‪

X‪

—‪

—‪

—‪

Faulty Injector(s) refer to "12.1 Factors That Affect Wheel Horsepower"

X‪

X‪

X‪

X‪

X‪

X‪

—‪

Faulty Turbocharger refer to "12.1 Factors That Affect Wheel Horsepower"

X‪

—‪

X‪

—‪

—‪

X‪

—‪

EGR Valve* refer to "12.1 Factors That Affect Wheel Horsepower"

X‪

—‪

X‪

X‪

—‪

X‪

—‪

Delta P Sensor or Plugged Lines* refer to "12.1 Factors That Affect Wheel Horsepower"

X‪

—‪

X‪

X‪

—‪

X‪

—‪

Charge Air Cooler Leak refer to "12.7 Restricted or Cracked Charge Air Cooler or Leaking Intake Manifold"

X‪

—‪

X‪

—‪

—‪

X‪

—‪

Intake or Exhaust Manifold Leak refer to "12.7 Restricted or Cracked Charge Air Cooler or Leaking Intake Manifold" and section "12.8 Faulty Exhaust System"

X‪

—‪

X‪

—‪

—‪

X‪

—‪

Quality/Grade of Fuelrefer to "12.1 Factors That Affect Wheel Horsepower"

X‪

X‪

X‪

X‪

—‪

X‪

—‪

High Fuel Temperature - Above 130°F refer to "12.5 High Fuel Temperature Return"

X‪

—‪

X‪

—‪

—‪

—‪

—‪

Restricted Air Intake refer to "12.1 Factors That Affect Wheel Horsepower"

X‪

—‪

X‪

—‪

—‪

X‪

—‪

Crankcase Overfilled refer to "12.1 Factors That Affect Wheel Horsepower"

X‪

—‪

X‪

—‪

—‪

—‪

X‪

Faulty Fan Operation, Always On refer to "12.1 Factors That Affect Wheel Horsepower"

X‪

—‪

X‪

—‪

—‪

—‪

—‪

Debris in Fuel Tank - Air Vent Plugged refer to "12.1 Factors That Affect Wheel Horsepower"

X‪

X‪

X‪

X‪

X‪

—‪

—‪

Table 1. Low Power Troubleshooting Chart


EPA07 Series 60 DDEC VI Troubleshooting Guide - 6SE567
Generated on 10-13-2008

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