HOOD AS 2234822 - Caterpillar

Electrical shock hazard. The electronic unit injector system uses 90-120 volts.
Turn the keyswitch to the OFF position. A strong electrical shock hazard is present if the keyswitch is not turned off.
Disconnect the harness connectors for the injector solenoids.
Turn the keyswitch to the ON position.
Perform the "Injector Solenoid Test" at least two times.Expected Result:All cylinders indicate "Open" on Cat ET.Results:
OK - All cylinders indicate "Open" on Cat ET. Connect the harness connectors. Proceed to Test Step 9.
Not OK - A cylinder indicates "Short" on Cat ET. There is a problem with the engine harness between the J2 connector and the valve cover harness.Repair: Repair the problem with the harness. Replace parts, if necessary. Start the engine. Verify that the problem is resolved.STOPTest Step 9. Check the Harness under the Valve Cover for a Short Circuit
Electrical shock hazard. The electronic unit injector system uses 90-120 volts.
Turn the keyswitch to the OFF position. A strong electrical shock hazard is present if the keyswitch is not turned off.
Remove the valve cover.
Disconnect the harness connector for each injector solenoid that indicates a "Short" on Cat ET. Ensure that each disconnected connector does not touch other components and create a short circuit.
Turn the keyswitch to the ON position.
Perform the "Injector Solenoid Test" at least two times.Expected Result:All of the injector solenoids that were disconnected indicate "Open" on Cat ET.Results:
OK - All of the injector solenoids that were disconnected indicate "Open" on Cat ET. Proceed to Test Step 10.
Not OK - At least one of the injector solenoids that were disconnected still indicate "Short" on Cat ET. There is a problem with the wiring harness inside the valve cover. There may be a problem with a connector.Repair: Inspect the connectors for moisture and for corrosion. Repair the wiring and/or the connector, when possible. Replace parts, if necessary.Verify that the problem is resolved.STOPTest Step 10. Check the Stream of Oil for the Injector
This service procedure requires the valve cover to be removed. This will expose the service technician to to moving parts which may case pinch or entanglement hazards. The hazards could result in personal injury or death. Keep all body parts, loose clothing, hair, and other items which could become entangled away from the moving parts.
Electrical Shock Hazard. The unit injector system uses 90 - 120 volts. The ECM sends this signal to the unit injectors. Do not come in contact with the unit injector harness connector while the engine is operating. Failure to follow this instruction could resulting in personal injury or death.
Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact the skin.
This service procedure requires removal of the valve cover. This will expose moving parts. Be sure to keep all tools and other objects away from the moving parts. Failure to do so may result in damage to engine components.
Start the engine. Allow the engine to operate at low idle.Note: Do not raise the engine speed above low idle.
Illustration 3 g01444428
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