WS2

-Toyota 4Age

By looking at the vehicle workshop manual we can obtain the correct pin to bridge and with the key on we can put the car into diagnostic mode , I really like this as we dont need expensive scan tool only a jumper wire , also so easy to use as in which direction you should be looking at , It does not always tell you what we exactly need to check or where to look but its always a good start .

- After looking at the workshop manual ... it states the ignition should be in the ON position and bridge terminal TE1 and E1. and this puts the car into diagnostic mode and we can use the car's own ECU it can tell us what faults it has logged on its memory .

- After fault codes were put in by the tutor we put the car in to diagnostic mode and the codes we found were : 2 & 7 these faults made the car run very rugh and keep turning off at idle .

There were also 3 & 5 which we got because we had the ignition module unplugged ( code 3) and unpulging engine RPM sensor inside the distributor ( code 5)

- By looking at the list below we can see what does each code number means

- After doing the visual inspection at faults found : I found the TPS sensor plug was not in properly and also the vacuum sensor plug was not in properly so the ECU was not getting good signal from these sensors .

- I repair these faults by making sure they were plugged in properly .

- To check and make sure I turned the car on and now it was running with out a problem and was running smoothly at idle and also when reved up .

- To clear the fault codes I disconnected the battery and left it for a couple of mins and then connected the battery back to the vehicle . I put the jumper wire back in TE1 and E1 and turned the ignition on .

code 1 means everything is normal and there are no faults detected by the ECU

- Code 2: Interupted signal from the manifold vacuum sensor . This fault will cause the vehicle to not run smoothly as the ECU doesnt know what the vauume pressure inside the intake manifold is ... also how much engine load we have specially when driving , not so much at idle and how much load its carrying and might struggle going up hill since it has no value from the vacuum sensor . It will cause the engine run poorly and to make the engine emission to rise because its not running at the optimum condition .

- Code 7: Interupted signal from the TPS . This fault will cause the engine run very poorly as the ECU has no idea what the driver intend is and how much air is coming inside the intake manifold and whether the diver is accelerating fully or half way and what he wants to do exactly . This will cause the engine to run poorly at idle or even more when driving and cause the emissions to rise as the ECU can not find the optimum condition for the vehicle.

- We can also check the supply wire voltage , check the ground by Voltage droping the earth wire with a good ground e.g negative post of the battery . also we can check the signal wire and make sure it is changing in the right manner and check all these information with manufator spec to see if it is within specified spec.