We created 3 fault codes on the toyota 4a-fe engine. To make the flash codes come up on the dash, you must use a jumper wire across terminals TE1 and E1 in the diagnosis plug. The flash codes came up as 12, 22, 31 and 41.
12 was G-NE signal circuit which we found to be the distributor clearance was to big. This was a real fault on the engine.
22 was the ECT unplugged.
31 was the MAP unplugged.
41 was the TPS unplugged.
To clear these codes, we disconnected the negative terminal on the battery. On a new car this would not be acceptable, you would have to remove the appropriate fuse.
We rechecked the codes, and got a constant flashing light. This means everything is ok.
As we unplugged some critical sensors, the ECU would've have insufficient information to run the car at its optimum.
When everything is returned to its original place, turn the engine on and rev it to double check all is ok.
If these faults were on a vehicle how would it run (be precise) also what other tests would you carry out before you relapsed any of these components
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