Section 12.2 Low Horsepower Troubleshooting Chart - DETROIT Series 60 Troubleshooting Manual

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
Possible Causes‪	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