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