Electronic Fuel System Diagnosis Flashcards
The two basic paths for diagnosis/troubleshooting are?
Symptom based
Fault code based
Why must you never touch electronic components when vehicle is running?
There is a high voltage present that can cause serious electrical shock and personal injury
What should be done before the removal of injectors?
Its advisable to disconnect the battery cables to power down the engine electronics and cranking system
When testing or replacing components in an electronic control system, you should:
Ensure the key switch is off before disconnecting any circuit
T/F ECM fault code charts will usually tell the technician to replace a component to see if that repairs the problem?
False
Fuel should be drained out of the cylinder head fuel passages before removing injectors to prevent what?
Fuel draining into combustion chamber. this can hydraulically lock the engine and result in a bent connecting rod
If a special puller tool is not available, an EUI can be safely removed using?
A heel bar
Before replacing an EUI, you should clean the injector tube paying particular attention to the?
Combustion seal seat
Injector o-rings should be lubricated with what before installation?
Engine oil
When replacing an EUP, failure to purge the fuel supply passages will result in?
Engine oil dilution
T/F When replacing an EUP, it is an acceptable practice to remove both of the mounting bolts and let the spring tension eject the pump from the cylinder block?
False
Before installing an EUP, you should?
Inspect the roller tappet for wear or damage
EUP heat shield are installed to?
Protect the electronic components
Before beginning injector removal, it is advisable to:
Disconnect the battery cables to power down and engine electronics and cranking system
The battery cables should never be disconnected if?
The engine is running
