Troubleshooting > Dodge Diesel
|In order to do proper diagnostics you will need a scan tool and some special tools available from Miller Special Tools http://millerspecialtools.spx.com .High Pressure Common Rail Basic Information
The high pressure pump builds the high pressure and delivers it to the fuel rail manifold where it flows through the injector lines and injector connector tubes to the injectors. The fuel pressure regulator (fuel control actuator) in the high pressure pump controls fuel rail pressure. The injectors have a hollow check ball that holds high pressure fuel until the fuel solenoid is actuated by the ECM, this allows the check ball to rise off its’ seat and an injection to take place. If the injector connector tubes, where they seat into the injectors, leak or the check ball in the injector is leaking or the high pressure limit valve then it will not build enough rail pressure to start the engine. It takes approximately 4000 PSI rail pressure to start the engine.CAUTION
The fuel system contains high pressure fuel up to 25,000 PSI. Do Not use you fingers to find fuel leaks! High pressure fuel entering your bloodstream may result in amputation or loss of life.
No Start or Hard Start
Surge at idle
White – Blue smoke at idle when cold
Fuel Supply Pump
High Pressure Pump (CP3 Pump)
Use the following information regarding diagnostic trouble codes in addition to the normal diagnostic procedures outlined in the service manual or technical service bulletins.
DTC P0148; high pressure common rail checksum, which is a deviation between the fuel pressure set point and the actual fuel pressure.
DTC P0300 – P0306; injector misfire, all and 1 through 6
DTC P0217; decreased engine performance due to a engine overheat condition
DTC P0251; CP3 pump regulator control, ECM detects a discrepancy between PWM signal supplied to FCA and the PWM returned from FCA
DTC P0336; crank position sensor (CKP) signal, CLP below calibrated value
FUEL SUPPLY PUMP PRESSURE
In order to maintain good fuel flow, especially with performance modifications, you may need to add an additional supply pump.
NOTE: The following information is not a substitute for the proper diagnostic manuals, but to share some of the common problems we have run across.
HARD START: HOT OR COLD
SURGE WHILE DRIVING
SURGE AT IDLE: OR RUNS ERRATIC AT IDLE
In addition to the information in the Diagnostic Procedure Manuals, consider the following checks and information.
DTC 215 – Fuel Injection Pump Control Circuit
DTC 216 – Fuel Injection Pump Timing Failure
DTC230 – Transfer Pump Circuit Out of Range
DTC336 – Engine Crankshaft Position Sensor (CKP) Signal
DTC370 – Fuel Injection Pump Speed / Position Sensor Signal Lost
DTC602 – ECM Fueling Calibration
DTC1688 – Internal Fuel Injection Pump Failure
DTC1689 – No Communication Between ECM and Injection Pump Module
DTC1690 – Fuel Injection Pump CKP Sensor Does Not Agree With ECM CKP
DTC1691 – Fuel Injection Pump Controller Calibration Error (PSG)
DTC1693 – DTC Detected in PCM
DODGE SPECIAL TOOLS millerspecialtools.spx.com Miller (Dodge) special tools
|1994-1998 DODGE 12 Valve:The following information has been put together to help you troubleshoot complaints and to better understand the basic operation of the engine and fuel system. The correct tools and service manuals for performing the repair procedures will be needed.Hard start, no start
Miss, Blue/White Smoke
Stalling or dies on deceleration
Air Intake Heater
Overflow Valve and Supply pump
Shut off solenoid
|Cold Advance Operation; The KSB unit on the injection pump uses a temperature sensor in the intake manifold to advance the pump to engine timing when the engine is cold, which reduces blue/white smoke.
Slow to shut off