Engine System
• When fully depressing the accelerator pedal, whether the throttle valve fully opens or not
• Whether the amount of coolant and engine oil is good or not, whether the drive belt tension Read more Basic Automotive inspection
Troubleshooting
Harsh Engagement of the Driving System in A/T Vehicle
The symptoms relating to strong shocks in the driving system in an A/T vehicle can roughly be separated into two types.
• Only shock is sensed
• Both shock and sound are sensed When both shock and Read more Harsh Engagement of the Driving System in A/T Vehicle
Automotive Troubleshooting Insufficient Power
The causes of insufficient power are roughly classified as follows.
• Poor acceleration
The vehicle can run smoothly, but acceleration as a reaction of the throttle valve opening is not done.
The Read more Automotive Troubleshooting Insufficient Power
Automotive Troubleshooting Engine Stall and Hesitation 2 of 2
<2> Narrow down fuel system
• Fuel pressure inspection
When the symptom occurs, check whether the fuel pressure exists or not.
In the case where fuel pressure exists
• Injector and injection Read more Automotive Troubleshooting Engine Stall and Hesitation 2 of 2
Automotive Troubleshooting Engine Stall and Hesitation 1 of 2
Engine stall
There are many conditions under which engine stall occurs.
• When the engine is idling, the engine speed becomes unstable and the engine stalls.
• While the vehicle is running, when Read more Automotive Troubleshooting Engine Stall and Hesitation 1 of 2
Automotive Idling Troubleshooting 2 of 2
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 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