Fault Diagnosis

What is EOBD

• Engine On Board Diagnostics

• ECU On Board Diagnostics

• European On Board Diagnostics

• ECM On Board Diagnostics

With this freeze frame data what is the LTFT and what does 0.18% mean?

• Long Term Fuel Trim
  0.18% means it's adding fuel but is running well inside tolerances

• Light Term Fuel Trim
  0.18% means it's adding fuel but is running well inside tolerances

• Long Term Fuel Trim

  0.18% means it's reducing fuel but is running well inside tolerances

• Long Term Fuel Trims

  0.18% means it's adding fuel but is struggling to meet tolerances

What is the first stage of the 8 step Diagnosis Procedure?

• Read the DTCs

• Verify the problem

• Clear the DTCs

• Check for known Problems

When performing "Basic Inspection and Test" what are you looking for?

• Body panel damage that the customer may blame you for

• VIN and Engine Number

• Damage, tampering and bad repair work

• MOT failure items

What does DTC stand for?

• Data Trip Codes

• Diagnostic Trouble Codes

• Diagnostic Trip Codes

• Data Trouble Codes

Looking at this DATA. the ​ (a)   causing the Short Term Fuel Trims to ​ (b)   to compensate. This is ​ (c)   behaviour,

• Throttle Valve closed
• Tick over increased
• Detrimental
• Increase
• Purge Valve opened
• Reduce
• Expected

What is the 8th Step in "The 8 Step Diagnosis Procedure"?

• Hand the Car back with a Smug Grin

• Clear DTCs and Road Test before handing back to the customer

• Confirm the cause of the problem and make the repair

• Isolate and remove the fault

Match the following

• Oxygen Sensor

• 
• Crank sensor

• 
• Knock Sensor

• 
• MAF Sensor

• 
• Throttle position sensor

• 

"The long term fuel trim value increases when the oxygen content in the exhaust gases is higher than normal.”

Is this statement true or false?

• True

• False

Which of these faults will cause a P0202 DTC to be generated?

• Fuel injector Leak

  in Cylinder 4

• Faulty Fuel Injector

  in Cylinder 3

• Broken wire in fuel injector

  In Cylinder 2

• Bad connection to Fuel Injector

  In Cylinder 1