Flash codes

1. Flash/Blink Codes

1.1         Find a engine/vehicle that you have the workshop manual with the correct procedure and codes to diagnose the flash codes

1.2         Have your tutor create a fault in the EFI system

1.3         Using the workshop manual follow the procedure to extract the codes, explain briefly what is the procedure

To find a fault code on the engine you will see the engine light flashing.

Turn the engine off , then turn the key on without starting the vechile. The codes will begin to flash on the check light.

All codes are 2 digit numbers. The codes 55 indicate the end of the message.

2             Trouble Codes or Fault Codes

2.1         Find where the Codes are listed

 

2.2         Record any codes, and what system and condition they describe in the chart below (Example: might be code number 21, for Throttle Position Sensor, signal voltage too low)

 

Code number	System affected	Condition described
22	Water Temp	Engine runs rough
41	TPS	No voltages
31	Vaccum Sensor	The voltage is high and will not move
24	Intake air temp	The voltage is low and will not move

3             Visual Inspection to find fault

3.1         Do a visual inspection under the bonnet to find where the problem is. Use information from the code to know where to look for the problem and what type of problem to look for.

3.2         Describe the problem(s) you found:

Following the fault codes from the book, I found out that there were disconnected of some sensors, such as a water temperature sensor, TPS, vacuum sensor and intake air temperature sensor. 

Check the condition of the wires

4             Repair fault

4.1         Plug back in the connector, or repair problem found

Describe what you did:

After i pluged back in the connector, I have checked the engine condition and retested the signal voltage of sensors. The engine have recovered with appropriate conditions.
I checked the code numbers again , then i dissconnected the battery terminals for 30 seconds and put it back on the battery and tunred the engine to check the light was flashing that means that the codes are now cleared

5             Clear Codes 

Describe what you did to clear the codes:

It was very simple , i just disconnected the neagative lead on the battery and then took the main fuse our for about 30 seconds

6             Recheck for codes and record codes in system now:

After clear codes, E1 and TE1 of diagnosis box should be reconnected. When the ignition switch is turned on and the engine is not running, the check engine light is contantly flashing that means normal condition of the engine without any faults. I rechecked the codes and found there was no codes which mean they were all cleared

7             How could the faults found affect the engine performance?

           

The engine wouldnt run properly which mean low engine performance and it could also create idling problems

8             Discuss what other tests you should be doing once you have found the fault codes:

After i had did the fault check , i had to check the voltages to see if it was within the speciification on all the sensors to check if they were any faults.