RING-BACKUP 8C9188 - Caterpillar

Probable Causes
Diagnostic codes
ECM parameters
Electrical connectors
Air intake and exhaust system
Valve lash
Turbocharger
Fuel supply
Low compression (cylinder pressure)
Individual malfunctioning cylinder
Electronic unit injectorsRecommended Actions
Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.
Diagnostic Codes
Check for active diagnostic codes on the electronic service tool. Troubleshoot any active codes before continuing with this procedure.ECM Parameters
Use the electronic service tool to make sure that the FLS and FTS parameters have been correctly entered.
Use the electronic service tool to ensure that the correct mode was selected.
Use the electronic service tool to verify that the correct engine rating has been provided.
Use the electronic service tool to verify the maximum engine speed limit.
Ensure that the repairs have restored the expected performance.
If the repairs have not eliminated the faults proceed to "Electrical Connectors". Electrical Connectors
Turn the start switch to the ON position.
Use the electronic service tool to verify that the intake manifold pressure is 0 0.5 kPa (00 0.070 psi). Check the 5 V sensor supply for the intake manifold pressure. Refer to Troubleshooting, "5 Volt Sensor Supply Circuit - Test".
Use the electronic service tool to verify the throttle position status.
Run the engine until the speed is equal to the maximum no-load speed.
Use the electronic service tool to make sure that the throttle is set to reach the maximum no-load speed.
If the maximum no-load speed can not be obtained refer to Troubleshooting, "Throttle Switch Circuit - Test" and Troubleshooting, "Mode Selection Circuit - Test".
If the engine speed is erratic refer to Troubleshooting, "Analog Throttle Position Sensor Circuit - Test" or Troubleshooting, "Digital Throttle Position Sensor Circuit - Test".
If the fault has not been eliminated, proceed to "Air Intake and Exhaust System". Air Intake and Exhaust System
Check the air filter restriction indicator, if equipped.
Ensure that the air filter is clean and serviceable.
Check the air intake and the exhaust system for the following defects:
Blockages
Restrictions
Damage to the air intake and exhaust lines and hoses
Make all necessary repairs to the engine.
If the fault has not been eliminated, proceed to "Valve Lash". Valve Lash
Check the valve lash and reset the valve lash, if necessary. Refer to Systems Operation, Testing and Adjusting, "Engine Valve lash - Inspect and Adjust".
If the repair does not eliminate the fault proceed to "Turbocharger". Turbocharger
Note: The turbocharger that is installed on this engine is a nonserviceable item. If any mechanical fault exists, then the turbocharger must be replaced.
Ensure that the mounting bolts for the turbocharger are tight.
Check that the oil drain for the turbocharger is not blocked or restricted.
Check that the compressor housing for the turbocharger is free of dirt and debris.
Check that the turbine housing for the turbocharger is free of dirt and debris.
Check that the turbine blades rotate freely in the turbocharger.
Ensure that the wastegate on the turbocharger is adjusted correctly. Refer to Systems Operation, Testing and Adjusting, "Wastegate - Inspect". If the wastegate actuator is faulty, replace the turbocharger. Refer to Disassembly and Assembly, "Turbocharger - Remove" and Disassembly and Assembly,