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P-101: Engine Will Not Crank
Probable root causes: These are NOT electronic problems with the 3176 Vehicular Diesel Engine* Batteries* Starting Circuit Problem (in vehicle wiring)* Starter Solenoid* Starter Motor* Starter Ring Gear* Transmission or Power Take-Off Problem* Hydraulic Cylinder Lock* Internal Engine ProblemPerform the following tests in order:1. Charge batteries (see Special Instruction, Form No. SEHS7633, for Battery Test Procedure).2. Load test batteries (see Special Instruction, Form No. SEHS9249, for Use Of 4C4911 Battery Load Tester.3. Check vehicle wiring to starter solenoid (see vehicle manufacturers instructions).4. Inspect starter cables for damage or loose connections.5. Remove and clean starter cables and connections if corroded.6. Test starter solenoid operation. Refer to 3176 Vehicular Diesel Engine, Form No. SENR4964, for Systems Operation Testing and Adjusting.7. Test starter motor operation. Refer to 3176 Vehicular Diesel Engine, Form No. SENR4964, for Systems Operation Testing and Adjusting.8. Remove and inspect starter ring gear for damage.9. If engine will not turn over by hand, disconnect transmission and check for damage.10. Check for fluid in cylinders by removing individual nozzles.11. Disassemble engine to inspect for internal components that may be seized, broken, out of alignment, etc. Refer to 3176 Vehicular Diesel Engine, Form No. SENR4965, for Disassembly & Assembly.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 if the engine shut down completely and had to be restarted using the key switch. Probable root causes:* Battery power or ground to ECM (vehicle wiring).* Aftermarket engine protection devices (the 3176 Diesel Engine does NOT currently have its own engine protection shutdown feature).* 3176 Engine wiring harness* Fuel supply* Engine Speed/Timing Sensor* ECM or Personality ModulePerform the following tests in order:1. Check external 3176 Harness and connectors (refer to P-201: Inspecting Electrical Connectors.2. Check for correct installation and operation of engine protection devices.3. Check for correct installation of J4/P4 (40 Pin-ECM connector).4. P-210: Electrical Power Supply Test.5. Check fuel lines for restrictions and fuel tanks for foreign objects which may block fuel supply.6. P-221: Engine Speed/Timing Sensor Test.7. P-220: ECM and Personality Module Test.P-111: Intermittent Low Power Or Power Cutouts
Use this procedure only if engine DOES NOT completely shut down (that is, it did NOT need to be restarted using the key switch). Probable root causes:* Poor electrical connections* Battery power or ground to ECM (vehicle wiring)* Fuel supply* Throttle Position SensorPerform the following tests in order:1. Check external 3176 Harness and connectors (refer to P-201: Inspecting Electrical Connectors).2. P-210: Electrical Power Supply Test3. Check fuel lines for restrictions and fuel tanks for foreign objects which may block fuel supply.4. P-211: Throttle Position Sensor Test.P-120: ECAP/DDT Will Not Communicate With 3176 System
Probable root causes:* Electrical power supply to ECM* Connector or wiring problem in 3176 System wiring harness* ECAP/DDT or service tool "T" Cable problem* ECM or Personality ModulePerform the following tests in order:1. P-210: Electrical Power Supply Test.2. P-201: Inspecting Electrical Connectors - Vehicle Connector (J7/P7), Engine Data Link Connector (J8) and ECM Connector (J4/P4).3. Verify correct operation of ECAP/DDT and Harness Connector Cable on another engine.4. P-220: ECM And Personality Module Test.