DD15 Troubleshooting

Section 10.2 Low Power Troubleshooting Chart

Section 10.2
Low Power 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 Detroit Diesel 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

X‪

X‪

X‪

X‪

X‪

—‪

—‪

Fuel Shut-Off Valve not Open‪

X‪

X‪

X‪

X‪

X‪

—‪

—‪

Air in the Fuel‪

X‪

X‪

X‪

X‪

X‪

—‪

—‪

Faulty Injector(s)‪

X‪

X‪

X‪

X‪

X‪

X‪

—‪

Faulty Turbocharger‪

X‪

—‪

X‪

—‪

—‪

X‪

X‪

EGR Valve*‪

X‪

—‪

X‪

X‪

—‪

X‪

—‪

Delta P Sensor or Plugged Lines*‪

X‪

—‪

X‪

X‪

—‪

X‪

—‪

Charge Air Cooler Leak‪

X‪

—‪

X‪

—‪

—‪

X‪

—‪

Intake or Exhaust Manifold Leak‪

X‪

—‪

X‪

—‪

—‪

X‪

—‪

Quality/Grade of Fuel‪

X‪

X‪

X‪

X‪

—‪

X‪

—‪

High Fuel Temperature - Above 130°F‪

X‪

—‪

X‪

—‪

—‪

—‪

—‪

Restricted Air Intake‪

X‪

—‪

X‪

—‪

—‪

X‪

—‪

Crankcase Overfilled‪

X‪

—‪

X‪

—‪

—‪

—‪

X‪

Faulty Fan Operation, Always On‪

X‪

—‪

X‪

—‪

—‪

—‪

—‪

Debris in Fuel Tank - Air Vent Plugged‪

X‪

X‪

X‪

X‪

X‪

—‪

—‪

Table 1. Low Power Troubleshooting Chart


EPA07 DD15 Troubleshooting Guide - DDC-SVC-MAN-0029
Generated on 10-13-2008

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