Dodge Ram Truck 1500-2500-3500. Manual — part 1138
*ENGINE SPEED SURGES LOW OR HIGH IDLE
Possible Causes
POSSIBLE CAUSES
Diagnostic Test
1.
POSSIBLE CAUSES
This is a list of possible causes:
Check for any TSBs for ECM calibration updates that my apply.
Fuel level low.
Fuel filter plugged.
Poor quality or improper grade of fuel.
Fuel tank venting.
Low fuel pressure.
Air in fuel system
Fuel Lift Pump malfunctioning.
Fuel Inlet restriction.
Fuel line kinked or restricted.
Fuel return passage or fuel return line kinked or restricted.
Injectors are incorrect.
Injector shim thickness is incorrect.
Injector malfunction.
Fuel connector leaking fuel.
High pressure Fuel pump.
Accelerator pedal is restricted or out of calibration.
Vibration damper is damaged.
Crankshaft position sensor (CKP) or Camshaft position sensor (CMP) and/or circuit malfunction.
Vehicle Speed sensor (VSS) and/or circuit malfunction.
Incorrect Transmission Clutch operation.
Check vehicle brakes for dragging, transmission malfunction, cooling fan operation cycle time and engine driven
devices.
Check for proper turbocharger, turbo charger wheel clearance is out of specifications, waste gate for correct oper-
ation.
Bus communication problems.
Moisture in harness connectors or corroded terminals.
Internal engine damage.
Electronic noise.
Idling with excessive load.
Clutch is malfunctioning or incorrect.
Speed indicator ring
Injector circuit
View repair.
Repair
Repair as necessary. Refer to Service Information for the related symptom(s).
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
9 - 1474
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
*ENGINE DIFFICULT TO START OR WILL NOT START (NO EXHAUST SMOKE
WHILE CRANKING)
Possible Causes
POSSIBLE CAUSES
Diagnostic Test
1.
POSSIBLE CAUSES
This is a list of possible causes:
Check for any TSBs for ECM calibration updates that my apply.
Fuel level low.
Poor quality or improper grade of fuel.
Fuel filter plugged.
Fuel tank venting.
Low fuel pressure.
Air in fuel system
Fuel Lift Pump malfunctioning.
Fuel Inlet restriction.
Fuel injection pump supply voltage open or low voltage.
Fuel inlet line kinked or restricted.
Fuel return passage or fuel return line kinked or restricted.
Injectors are incorrect.
Injector shim thickness is incorrect.
Injector malfunction.
Fuel connector leaking fuel.
Crankshaft position sensor (CKP) or Camshaft position sensor (CMP) and/or circuit malfunction.
Moisture in harness connectors or corroded terminals.
Skim issues.
Battery voltage low.
Ignition switch supply voltage low or open.
Battery voltage to ECM is low or open.
Electrical noise.
Fuel injection pump.
Engine Control Module.
Internal engine damage.
View repair.
Repair
Repair as necessary. Refer to Service Information for the related symptom(s).
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1475
*ENGINE DIFFICULT TO START OR WILL NOT START (EXHAUST SMOKE)
Possible Causes
POSSIBLE CAUSES
Diagnostic Test
1.
POSSIBLE CAUSES
This is a list of possible causes:
Check for any TSBs for ECM calibration updates that my apply.
Fuel level low.
Battery voltage low.
Fuel filter plugged.
Poor quality or improper grade of fuel.
Fuel tank venting.
Low fuel pressure.
Air in fuel system
Fuel Lift Pump malfunctioning.
Fuel Inlet restriction.
Fuel line kinked or restricted.
Fuel return passage or fuel return line kinked or restricted.
Injectors are incorrect.
Injector shim thickness is incorrect.
Injector malfunction.
Fuel connector leaking fuel.
Crankshaft position sensor (CKP) or Camshaft position sensor (CMP) and/or circuit malfunction.
Moisture in harness connectors or corroded terminals.
Internal engine damage.
Air intake restriction.
Exhaust restriction.
Fuel inlet temperature high.
Overhead adjustments.
Ignition switch output voltage low and/or open.
Starting accessories for cold weather such as engine block heaters, fuel heaters if equipped.
Engine cranking speed is low.
Electrical noise.
Fuel control actuator circuit
Speed indicator ring
Pressure limiting valve
Injector circuit
Air inlet restriction
External fuel leaks
View repair
Repair
Repair as necessary. Refer to Service Information for the related symptom(s).
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
9 - 1476
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
*ENGINE SPEED SURGES IN PTO OR CRUISE CONTROL
Possible Causes
POSSIBLE CAUSES
Diagnostic Test
1.
POSSIBLE CAUSES
This is a list of possible causes:
Check for any TSBs for ECM calibration updates that my apply.
Fuel filter plugged.
Fuel Inlet restriction.
Fuel line kinked or restricted.
Fuel return passage or fuel return line kinked or restricted.
Accelerator pedal is restricted or out of calibration.
Vehicle Speed sensor (VSS) and/or circuit malfunction.
Transmission gear shift.
Check vehicle brakes for dragging, transmission malfunction, cooling fan operation cycle time and engine driven
devices.
Moisture in harness connectors or corroded terminals.
ECM control, PTO speed governor.
Engine overload.
Air Inlet restriction
View repair
Repair
Repair as necessary. Refer to Service Information for the related symptom(s).
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1477
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