Re: C3 1.6hdi Code P0693 and P0493

[MyC3]

2012 C3 1.6hdi

My next problem is that the Code P0693 and P0493 show up on a diagnostic instrument ( Not Diagbox)
I have changed the unit that is connected to the fan motor ( I see it as 1529 on a print I have of the cooling circuit diagram) Called perhaps fan motor control or relay unit.
Despite the change I still see these fault codes appearing.
I have tested the radiator fan by connecting pins 1 and 2 together on unit 1529 which therefore applies 12V+ directly to the motor. It runs fine as far as I can see.

With the plug4VNR ( I think it is called) removed on the 1529 I measure Pin 1 3.5 V Pin 2 3.5 V Pin 3 12V Pi 4 10.8V.
The car will not rev beyond 3500 in neutral and lacks power so it must be in a safe mode of operation.

Supplementary info. The Stop and Start system doesnt work . It hasnt since changing the engine.
The car engine is not the original engine. It is of the same type though and I have driven 20 K miles since changing the engine.
There is another code that appears U1218 . something about CAN and BSI.
The three faults are all permanent faults.


VF7**************[VIN obfuscated, can be read by forum staff]**************[VIN obfuscated, can be read by forum staff] is the original number of this car.

[Mike_2025]

Did you ever find your problem I'm seemingly having the exact same problem same voltage on the 4 pins as yours