DSG-423 ENGINE CONTROLS
08-37
Symptom Charts
NOTE: If you have a symptom of the pedal not working,
and no DTC is set, go to the voltage screen and check
pedal voltage. If pedal voltage is.75-1.25 volts, and idle
validation switch says you're at idle - replace the pedal.
NOTE: Items listed in the possible cause column
generally do not set a diagnostic trouble code (DTC) or
illuminate the MIL light.
NOTE: EDI engines are used in many different
applications and equipment. When performing any
system diagnosis be aware of any OEM inputs or
equipment monitoring devices that may have an effect
on the engine’s performance or any of the engine’s
operating systems.
Engine Performance - No Load
SYMPTOM POSSIBLE CA U S E
Engine Runs Briefly and
Shuts Down
• Loss of Spark
• Frozen Fuel Regulator (Dry Fuel)
• Low Fuel Pressure
• Air Inlet Restriction
• Wiring Failure
• GCP Failure
Engine Cranks But No Start • Faulty OEM Drivers Safety Shut-Off Seat Switch
• Coil Power Loss
• GCP Ground Loss
• GCP Power Loss
• Severe Vacuum Leak (Dry Fuel)
• Air Inlet Restriction
• Air Inlet Leak (Dry Fuel)
• Fuel Lock-Off Inoperative (Dry Fuel)
• Wiring Failure
• Low Fuel Pressure
• Ancillary Components Binding
Engine Runs Poorly • High Fuel Pressure
• Low Fuel Pressure
• Contaminated Fuel
• Incorrect Fuel Select Table Selected
• Wrong GCP Installed
• Actuator Air Blockage
• Map Sensor Leak
• Fuel Contaminated
• Noise Suppression Capacitor Failure
• Improper PCV Routing
• Valve Timing
• Low Cylinder Compression
Engine Cranks Slowly • Excessive Engine Load (Hydraulic Pump Failing, Binding
Ancillary Drive Components)
• Low Battery Voltage
• Incorrect Battery Specifications
• Incorrect Battery Cable Size
• Starter Relay
• Starter Failure (Excessive Drain)
Engine Does Not Crank • Dead Battery
• Ground Loss
• Ancillary Components Binding or Seized
• OEM Shutdown - Oil Level Safety
• Starter Lockout Relay Failure
• Ignition Switch Failure
• Bad Starter
• Crank Control Wire Failure
• Loose Connection or Corrosion