6. Inspect the air fuel ratio in the gasoline engine
When the malfunction affects all cylinders, it is important when troubleshooting to judge whether the A/F is rich or lean. In this inspection, perform Read more Automotive Idling Troubleshooting 2 of 2
automotive
Automotive Idling Troubleshooting 1 of 2
The problem symptoms due to poor idling are classified into two groups.
• The engine does not smoothly turn and the engine vibrates.
• The idling speed is abnormal (the speed is high, low, hunting). Read more Automotive Idling Troubleshooting 1 of 2
Engine Trouble Difficulty in Starting the Engine 2 of 2
In the case of the gasoline engine:
• Ignition system
When the ignition spark is weak or has no spark, the DTC relating to the ignition signal or relevant area is not displayed. As a result, the malfunction Read more Engine Trouble Difficulty in Starting the Engine 2 of 2
Engine Trouble Difficulty in Starting the Engine 1 of 2
Malfunctions regarding the engine start are roughly classified into two groups.
• The engine is not cranked properly
• The engine is cranked but does not start easily
• When devising the procedures Read more Engine Trouble Difficulty in Starting the Engine 1 of 2
Fundamentals of Troubleshooting
Confirm the flow of troubleshooting based on the fi ve stages of troubleshooting method using examples of engine and harsh engagement of the driving system in A/T vehicle.
• Difficulty in starting Read more Fundamentals of Troubleshooting
Automotive Recurrence Prevention
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
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