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Cherepovets: On-site diagnostics

The story began when our client turned off the car, went to the store, returned, the key to start – and the engine does not start. What to do? It would be nice if you could call and come to your place and fix the car! Demand creates supply – there are such services in search engines in our city. Our client was seduced by this, and they came to him with a scanner.

When trying to start the engine, all the devices behaved as expected, with the exception of the non-dimmed lamp of a standard immobilizer (a machine with a lock, a key). We connected a scanner, but there were no errors in the memory of the engine control unit – here’s an ambush, where to dig, a dead end!

The comrades did not despair, they began to try to turn on the starter directly by shorting the relay contacts, apply voltage to where it should not. As expected, there was no launch. And, in the end, their conclusion is “you have a problem in the immobilizer, perhaps the key has flown, erased from memory, or something like that.” I wonder if the lamp was not on, what would they say then? Diagnostics for departure costs from 500r.

And here you can’t get anywhere – you had to call a tow truck. So the car turned out to be with us.

American cars in matters of electrical power cars are slightly different from Japanese and European. The ignition switch has both 12 volt and 5 volt circuits, and already by its signal the on-board electronics unit (BCM) energizes the entire car through high-current relays.

But you don’t have to think that you know everything and you never will, you don’t have to poke randomly: you just need to take and open the catalog for this machine, open the diagrams, study the issue, and test methods. The catalogs are in English, and this should not be a problem in diagnostics, just like the language in the scanner menu, so that there are no misunderstandings in the translation.

Yes, an hour and a half passed in the study in front of the computer, but there were clues, a chain of actions, checks that should be carried out to find the reason.

And everything brought us into the harness of the engine compartment, there we were waiting for the frayed, rotten wire.

They coped with one problem. But as it turned out, this was not the end – the starter still did not want to twist. I will not pull the rubber: the problem was in the fuse box under the hood, where the starter relay is and where there were attempts to start the car with on-site diagnostics.

Inside the unit there is a multilayer board that cannot be repaired, and the relay control paths turned out to be burned out and closed.

The result is a short circuit in the fuse box. And it’s fortunate that the engine control unit did not fail, because it is he who supplies power to the relay at the moment of turning the key by permission from BCM.

Please note: “Not like on other cars.” Which was a fatal mistake that stood for the block of life fuses. Due to its high cost, I had to change the starter switching circuit.

This record would not have appeared if it had not been for the frequent stories and complaints of our clients about on-site diagnostics and wasted money in 90% of cases. For example, another case: the owner of an Opel Zafira with a robotic gearbox called on-site diagnostics twice, carried out adaptations, read and erased errors, but the car still twitched when shifting gears. And it was only necessary to change (and do not forget to do it regularly) the clutch release fluid. Do not do like this).

People should understand that a car is not a kettle, it cannot be repaired on a knee, and a scanner is not a diagnosis. Diagnostics – a set of checks that allows you to accurately find the problem does not last 5-10 minutes.


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