The Thinking of Recurrence Prevention
The malfunction has not been completely resolved if the problem recurs immediately after repair. Therefore, it is important to pursue the true cause of the problem Read more Automotive Recurrence Prevention
Troubleshooting
Automotive Troubleshooting Terminal Contact Pressure Inspection
Purpose of inspection
When a malfunction such as poor contact occurs momentarily, inspect the contact pressure to determine where the malfunction area is.
(1) Disconnect the connector
(2) Visually check Read more Automotive Troubleshooting Terminal Contact Pressure Inspection
Automotive Troubleshooting Exhaust Condition Inspection
Purpose of inspection
Inspect the diesel engine’s combustion condition based on the discharged smoke.
• With white smoke
White smoke is caused by combustion at a comparatively low temperature and Read more Automotive Troubleshooting Exhaust Condition Inspection
Automotive Troubleshooting the Valve Guides Inspection
Why the cause of white smoke can be determined by oil loss via the valve guides
(1) The negative pressure of the intake manifold is high when the engine is idle, so oil is sucked into the combustion chamber Read more Automotive Troubleshooting the Valve Guides Inspection
Automotive Troubleshooting Oil Loss Via the Piston Ring
Automotive Troubleshooting Oil Loss Via the Piston Ring/the Valve Guides Inspection
Purpose of inspection
When burning oil causes white smoke to be seen in the exhaust gas, changing the engine rpm Read more Automotive Troubleshooting Oil Loss Via the Piston Ring
Automotive Troubleshooting Air Fuel Ratio (A/F) Inspection
Purpose of inspection
To determine whether the malfunction is a rich or a lean air fuel mixture.
Criteria
Using an intelligent tester, check the voltage of the O2 sensor or short term fuel
trim.
The Read more Automotive Troubleshooting Air Fuel Ratio (A/F) Inspection
Automotive Troubleshooting Cylinder Power Balance Inspection
Purpose of inspection
By confi rming the change in the engine speed when the combustion of each cylinder is stopped in turn for power balance inspection, judge whether or not the malfunction affects Read more Automotive Troubleshooting Cylinder Power Balance Inspection
Automotive Troubleshooting Compression System Inspection
Inspection method
Using a compression gauge, measure the compression pressure.
Criteria
The standard value differs depending on the engine model, therefore refer to the Repair Manual.
When compression Read more Automotive Troubleshooting Compression System Inspection
Automotive Troubleshooting Fuel System Inspection
Inspection method (gasoline engines)
Inspect the following when cranking the engine.
(1) Pinch the engine compartment fuel hose with your fi ngers and check whether or
not fuel pressure is applied.
(2) Read more Automotive Troubleshooting Fuel System Inspection
Automotive Troubleshooting Ignition and Glow System Inspection
Automotive Troubleshooting Ignition and Glow System Inspection
Inspection method (gasoline engine)
Remove the spark plug and crank the engine to check for a spark at the tip of the plug and the spark’s Read more Automotive Troubleshooting Ignition and Glow System Inspection