BELT-SERPENTINE 2534531 - Caterpillar

Before using this section, be sure that you have:1. Gathered information about the complaint to adequately describe the symptoms.2. Verified that the complaint is not due to normal engine operation.3. Repaired all ACTIVE Diagnostic Codes.Then, Identify probable causes using the procedure in this section which best describes the symptoms. Then narrow the probable causes using:* What happened, and when?* Under what conditions?* What else occurred?* When did the symptoms begin (and what else happened at that time)?* Do they correlate to probable causes?* Did they occur at the same time as the symptoms?* Are some logged repeatedly?* Are they related to this symptom?* Do they have common probable causes?Finally, test each probable cause using the tests suggested by the procedure. Be sure to check connectors, especially on intermittent problems!P-300: Engine Will Not Crank
This is NOT a PEEC III system problem. Probable root causes:* 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: For details of tests below, refer to 3406B PEEC Diesel Truck Engine, Systems Operation Testing and Adjusting, Form No. SENR5146.1. 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. Use 3406B Diesel Engine, Systems Operation Testing and Adjusting Form No. SENR5146.7. Test starter motor operation. Use 3406B Diesel engine, Systems Operation Testing and Adjusting Form No. SENR5146.8. Remove and inspect starter ring gear for damage.9. Check for fluid in cylinders by removing individual nozzles.10. If engine will not turn over by hand, disconnect transmission and check for damage.11. Disassemble engine to inspect internal components (only as a last resort).P-301: Engine Cranks But Will Not Start
Probable root causes:* Electrical power supply to ECM* Fuel supply* Shutoff solenoid* Engine Speed Signal* Rack controls* Combustion problemPerform the following tests in order:1. P-501: Electrical Power Supply Test2. Check fuel supply for: * Air in fuel* Plugged fuel supply or return lines* Congealed fuel (wax) in temperatures below 0° C (32° F)3. P-513: Shutoff Solenoid Test4. P-512: Engine Speed Signal Test5. P-522: Rack Solenoid (BTM) Test6. P-521: Rack Position Sensor Test7. Check for combustion problems (too cold or mechanical problem).P-302: Engine Starts But Stalls Immediately
Probable root causes:* Shutoff solenoid* Electrical power to PEEC III* Fuel supply* Rack controls* Engine speed signalPerform the following tests in order:1. P-513: Shutoff Solenoid Test2. P-501: Electrical Power Supply Test3. Check fuel supply for: * Air in fuel* Plugged fuel supply or return lines* Congealed fuel (wax) in temperatures below 0° C (32° F)4. P-522: Rack Solenoid (BTM) Test5. P-521: Rack Position Sensor Test6. P-512: Engine Speed Signal TestP-303: Erractic Or Unstable RPM
Probable root causes:* Rack controls* Throttle position signal* Engine speed signal* Fuel