0279214 JOHNSON LEAF PLATE ASSEMBLY

Operator Information
* What happened, and when?* Under what conditions?* Does the problem occur at specific engine speeds?* Does the problem occur only when the engine is cold or warmed up, when the weather is cold or warm?* Certain altitudes, loads, gears, etc.* Does the problem occur when other vehicle systems are engaged, or are other vehicle systems also malfunctioning?* What else occurred?* When did the symptoms begin (and what else happened at that time)?LOGGED Diagnostic Codes
* Do they correlate to probable causes? Did they occur at the same time as the symptoms?* Are some logged repeatedly?Other Symptoms
* 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! Do not exchange components to avoid troubleshooting a repeatable problem.P-301: Engine Will Not Crank
Probable Root Causes:* Batteries* Starting circuit problem (in vehicle wiring)* Starting Motor solenoid* Starting Motor* Engine accessory* Hydraulic cylinder lock* Internal Engine Problem* Flywheel ring gear* Transmission or Power Take-Off problem These are NOT electronic problems with the Engine Control System. For more details on the following tests, Refer To Systems Operation, Testing And Adjusting Manual, SENR1158. Perform The Following Tests In Order:1. Charge batteries (Refer To Special Instruction SEHS7633, For Battery Test Procedure). Load Test Batteries (Refer To Special Instruction SEHS9249, For Use Of 4C4911 Battery Load Tester).2. Check vehicle wiring to starting motor solenoid (Refer To Vehicle OEM Instructions). Check engine start switch, switch power relay, etc.3. Inspect starting motor cables for damage or loose connections. Remove and clean starting motor cables and connections if corroded.4. Test starting motor solenoid operation. Refer to Systems Operation, Testing and Adjusting Manual, SENR1158. Test Starting Motor Operation.5. Remove and inspect engine accessories that may lock up the engine (Air Compressor, Power Steering Pump, Oil Pump, etc).6. Check for fluid in cylinders by removing individual injectors. Check for timing Pin left in flywheel housing after setting valve lash.7. Attempt to manually turn the engine using the 9S9082 Turning Tool.8. Disassemble engine to inspect for internal components that may be seized, broken, bent, etc. Refer To Disassembly & Assembly Manual, SENR1142.9. Remove and inspect flywheel ring gear for damage. Ensure free movement of driveline.P-302: Engine Cranks But Will Not Start
Probable Root Causes:* Low Oil, Out of Fuel, Air in the High Pressure Oil System.* ECM to Service Tool Communications check* After market engine protection devices (those not installed by Caterpillar).* Electrical power supply to ECM* Unprogrammed Personality Module in a New ECM or ECM.* Incorrect Engine Software* Engine Speed/Timing Signal* Injection Actuation Pressure System* Fuel supply* Low pressure/poor fuel quality* Combustion problem A new ECM has an unprogrammed Personality Module, and will cause this symptom. Accessing "ECM Status" in the FLASH PC Program without following this request with programming the Personality Module may also cause the engine to not start or communicate. Cycling the keyswitch OFF, then ON will correct this problem. Perform The Following Tests In Order:1. Check the engine oil level. Engine oil feeds the high pressure hydraulic pump. Make sure the engine is not out of fuel.2. If the engine has been recently worked on, check for air in the High Pressure Oil System. Only after opening/working on the High Pressure Oil System.3. Crank the engine for up to five 30 second cycles to purge the air from the oil system. Connect an Electronic Service Tool. Ensure the keyswitch is in the ON position. Attempt to access "Truck Engine Functions". If the Electronic Service Tool indicates the ECM will not communicate, proceed to next item.4. After market engine protection devices may interrupt power to the ECM and the ECM will not communicate with the Service Tool. Check for correct installation and operation of after market engine protection devices. You may have to override or bypass the device before you continue.5. Verify the ECM is receiving battery voltage. Check the ECM Power and Ground connections. Verify that the ECM is receiving battery voltage when the keyswitch is turned ON. Wire a bypass as indicated in Section 5: P-503 Electrical Power Supply To The ECM.6. If the ECM still will not communicate and the engine will not start, temporarily install a new ECM. Flash Program the same Personality Module into the new ECM. Test to verify that the ECM will communicate and the engine starts. If the engine starts, the old ECM is bad. If the engine does not start the problem is elsewhere.7. Connect an Electronic Service Tool and verify there is not an active 252-11 Incorrect Engine Software (59) diagnostic code. If the diagnostic code is present, Refer To Section 5: P-513 ECM Personality Module.8. Observe the engine rpm with an Electronic Service Tool Status Screen while cranking the engine. This may require the Electronic Service Tool to be powered by a separate 12VDC power source as shown below.9. If the Service tools displays 0 rpm while cranking the engine, there is a problem in the Speed/Timing Sensor circuit. Refer To Section 5: P-514 Speed/Timing Sensor. If engine rpm is present, the electronics are OK. Proceed to the next item.10. Crank engine while monitoring the Injection Actuation Pressure and Injection Actuation Control Valve Output. If the Injection Actuation Pressure is reaching at least (5 MPa) 725 psi the problem is not in the High Pressure Oil System.Connect an Electronic Service Tool and check for a 164-11 Injection Actuation Pressure System Fault Diagnostic EVENT Code. If a 164-11 has been recently logged, Refer To Section 5: P-515: Injector Solenoids11. Injection Actuation Pressure Sensor indicating a higher than actual pressure. Disconnect the Injection Actuation Pressure Sensor, and then crank the engine. If the engine starts. Monitor exhaust for smoke while cranking. If smoke is not present, there may be a fuel supply problem.12. Check fuel quality.13. Check Fuel Pressure. Check to ensure fuel system is primed. Check for restricted fuel supply lines and fuel filters. In temperatures below (0°C), 32°F check for congealed