20723663 Volvo.Penta Control unit

P-301: Engine Will Not Crank
This is NOT an electronic system problem. Refer to the Systems Operation, Testing & Adjusting Manual for additional information on the following tests. Probable root causes:* Battery Cables/Batteries* Starting motor solenoid or circuit problem (in system wiring)* Starting motor/flywheel ring gear* Transmission or Power Take-Off (PTO) problem* Engine accessory* Hydraulic cylinder lock* Internal engine problem Perform the following tests in order:1. Check Master Disconnect Switch, battery posts and battery/starter cables for loose connections and corrosion. Remove and clean cables and connections if corroded. Load test batteries, refer to Special Instruction, SEHS9249 Use Of 4C4911 Battery Load Tester. If necessary, charge the batteries. Refer to Special Instruction, SEHS7633 Battery Test Procedure.2. Test starting motor solenoid operation. Check system wiring to starting motor solenoid3. Test starting motor operation. Refer to P-335: Air Starting Motor. Inspect starting motor pinion and ring gear for damage.4. Ensure free movement of driveline. If not free, refer to the machine Systems Operation, Testing & Adjusting Manual. Check transmission neutral gear indicator for proper operation and adjustment, repair or replace as required. Refer to machine Service Manual for Transmission or PTO inspection and maintenance.5. Verify timing pin was not left in the flywheel housing after setting valve lash. Use the 9S9082 Engine Turning Tool and attempt to manually turn the engine. If unable to turn the engine, remove and inspect engine accessories that can lock up the engine (air compressor, oil pump, etc). Repair or replace as necessary. Refer to the engine System Operation Testing & Adjusting Manual.6. Remove injectors and check for fluid in the cylinders.7. Disassemble engine to inspect for internal components that may be seized, broken, bent, out of alignment, etc. Refer to the Disassembly & Assembly Manual.P-302: Engine Cranks But Will Not Start
Probable root causes:* Engine Shutdown Switch setting* An engine shutdown is Active* Speed/Timing signal; injection timing, incorrect speed/timing wheel orientation assembly.* Electrical connections to the unit injector solenoids* Personality Module or ECM* Machine/Engine wiring; electrical power supply to ECM* Starting aids* Fuel supply: tank is empty, poor fuel quality or unit injector priming problem, low supply pressure, air in low pressure fuel supply circuit* Combustion problem Perform the following tests in order:1. Make sure the Engine Shutdown Switch is in the RUN position. Connect an Electronic Service Tool and verify Shutdown Switch position status. If a shutdown has occurred, the keyswitch must be turned to the OFF position for at least 15 seconds before the engine will start. Some applications have a Ground Level and an Engine Mounted Engine Shutdown Switch. BOTH must be set to the RUN position for the engine to start. Refer to P-507: Engine Shutdown Switch.2. Use an Electronic Service Tool to verify a Shutdown is not Active. If a Shutdown is Active, determine the reason for the shutdown. After correcting the problem, cycle the keyswitch to the OFF position for at least 15 seconds before trying to restart the engine.3. Observe the engine rpm on an Electronic Service Tool Status screen while cranking the engine. If the Electronic Service Tool displays 0 rpm while cranking the engine, there is a problem in the Speed/Timing Sensor circuit. Refer to P-514: Speed/Timing Sensor. If engine rpm is present (50 rpm or more while cranking) the Speed/Timing circuitry appears to be operating correctly. Verify that the timing reference gear is installed correctly and keyed to the camshaft by means of the locating dowel. If the gear was installed backwards or flipped over during assembly, the engine will not start). Check for proper orientation between crankshaft and camshaft drive gears, repair as required. Refer to procedure in Disassembly & Assembly Manual.4. Ensure the Unit Injector connectors are properly installed. Refer to P-515: Injector Solenoids and perform step 3, the Injector Solenoid Test to confirm that the ECM can energize the unit injector solenoids.5. Verify there is not an Active 253-02 Diagnostic Code. If the diagnostic code is present, refer to Section 2: Programming Parameters.6. Check for correct installation of the ECM connector J1/P1, Speed/Timing Sensor connector J19/P19, and Unit Injector connectors J3/P3 through J18/P18. Refer to P-501: Inspecting Electrical Connectors. If the problem occurs only after the engine is warmed up, the circuit breakers may be exceeding the trip point because of overheating. Check the circuit breakers on the machine, reset if required. Refer to P-503: Electrical Power Supply. Aftermarket engine protection devices usually interrupt power to the ECM and prevent communications with the Electronic Service Tool. Check for correct installation and operation of aftermarket engine protection devices. The device may need to be bypassed to continue.7. Check operation of starting aids if cold ambient conditions prevail. Replace ether canister if empty or low. Check cylinder block jacket water heater for malfunction and replace if required.8. Inspect the engine fuel tank, refill as required. Monitor exhaust for smoke while cranking. If smoke is not present there may be a fuel supply problem. Check for restricted, collapsed, or pinched fuel lines and repair or replace as required. Refer to the Systems Operation, Testing & Adjusting Manual. Check fuel tank for foreign objects which may block the fuel supply.Check for air in the low pressure fuel supply system after replacing filters, working on the low pressure fuel supply circuit, or replacing unit injectors. Purge air from the low pressure fuel supply circuit. Refer to the Operation and Maintenance Manual. The use of a sight glass in the low pressure supply line can be helpful in diagnosing air in the fuel.Check fuel quality. In temperatures below 0°C (32°F), check for congealed fuel (wax). Refer to SEBD0717, Diesel Fuels And Your Engine.Check fuel pressure after the filter in the supply circuit during cranking. Refer to the Specifications manual for correct pressure values. If pressure is low, check for plugged fuel filters. If pressure still low, repair or replace fuel transfer pump, fuel transfer pump coupling, and fuel pressure regulating valve as needed.9. Check for combustion problems.P-303: Engine Misfires, Runs Rough Or Is Unstable
If the problem is