101603-2322 ZEXEL INJECTION-PUMP ASSEMBLY Cross 1016032322 220204722a

P-102: Engine Cranks But Will Not Start
Probable root causes:* Electrical power supply to the ECM.* Electrical connections to the fuel injectors.* Fuel supply* Engine Speed/Timing Signal* ECM or Personality Module failure.* Combustion problemPerform the following tests in order:1. P-210: Electrical Power Supply Test.2. If ECAP/DDT does not communicate with ECM, refer to P-120: ECAP/DDT Will Not Communicate With 3176 System, in this manual.3. Check that Fuel Injector Connector (J5/P5) is installed and oriented correctly.4. Check Fuel Pressure. Also, check that fuel system is primed and that fuel supply and return lines are not restricted. In temperatures below 0° C (32° F), check for congealed fuel (wax).5. P-221: Engine Speed/Timing Signal Test. Also be sure the timing reference ring is installed correctly (if the ring was installed backward during reassembly, the engine will not start).6. Check for combustion problems (too cold or mechanical problem).P-103: Engine Misfires, Runs Rough Or Is Unstable
If the problem is intermittent and cannot be re-created, refer to P-111: Intermittent Low Power Or Power Cutouts.If the problem is consistent and can be re-created, continue with this procedure. Probable root causes: If the problem only occurs under certain conditions (high rpm, full load, etc.) test the engine under those conditions. Troubleshooting the symptoms under other conditions can give misleading results.* Three cylinder cutout* Individual cylinder malfunction* Throttle position signal* Fuel supply - high pressure- low pressure- air in fuel- poor quality fuel* Air inlet restriction* Exhaust restrictionPerform the following tests in order:1. Verify that the complaint is not about the normal operation of the three-cylinder cutout feature.2. Isolate misfiring cylinder(s). Refer to P-222: Isolating Misfiring Cylinders, in this manual.3. Check throttle linkage adjustment. Refer to P-303: Throttle Position Sensor Adjustment, in this manual.4. Check Throttle Position Sensor. Refer to P-211: Throttle Position Sensor Test, in this manual.5. Check fuel quality. Refer to the Truck Performance Diagnostic Guide, Form No. SEBD0808.6. Inspect fuel system and check fuel pressure. Refer to 3176 Vehicular Diesel Engine, Form No. SENR4964, for Systems Operation, Testing & Adjusting.7. Check for air in fuel.8. Check for restrictions in the air inlet and exhaust systems. Refer to 3176 Vehicular Diesel Engine, Form No. SENR4964, for Systems Operation, Testing & Adjusting.P-104: Low Power/Poor Or No Response To Throttle
Probable root causes:* Active diagnostic codes* Customer Specified Parameters (normal operation)* Throttle position signal* Boost pressure signal* Fuel supply* Air inlet or exhaust restrictions* Inlet air system leaksPerform the following tests in order:1. Troubleshoot any ACTIVE diagnostic codes. * Codes 25 or 42 limit power or rpm or both* Code 32 limits engine speed to low idle* Code 56 may limit engine speed to low idle, depending on which parameter caused the code to be generated2. Verify that complaint is not normal (programmed parameter) operation.3. Verify that engine has shifted out of Cold Mode4. P-211: Throttle Position Sensor Test4. P-225: Boost Pressure Sensor Test5. Inspect fuel system components and check for correct fuel pressure.6. Check the air inlet and exhaust systems for restrictions.P-110: Intermittent Engine Shutdowns
Use this procedure ONLY