Hi All

I drive a ST150 (MK6 Fiesta) and have been getting the following error " Engine Systems Fault " in the cluster. When this happens i need to switch off and start again.. (The motor goes into limp mode so i dont have any other choice but to switch off) The error code P1720 - vehicle speed (meter) circut malfunction was printed out through a diagnostic reading.

Over the weekend it happened thrice in one day, after the third time the EMS came on... the next day it switched itself off....

It seems to happen when I’m on an incline (on a highway) and the motor somewhat "labours".. In Urban driving all seems fairly well.

My car went to ford and they advised it might be the throttle body? They’ve checked the sensors etc and all seems to be ok. (The day after it came from ford it happened again)

Does anyone know what this problem is?

PLEASE HELP!!!!!

 

From the error code it would not be the throttle body but a speed sensor, maybe a bit loose.
tabetha

 

I would agree with Tabetha , sounds more like a vehicle speed sensor issue , but with the fiesta this is fed to the Engine Control Module by the ABS module using CANBUS High and CANBUS Low , I would say you may well have a issue with the network , as tabetha says loose connection or a faulty wire not giving a constant connection , don't forget canbus work in digital format so they have to have VERY good connections to be able to transmit the data as required .

The only other issue is that something else on the CANBUS network is causing the signal to become distorted in some way , if you take your car to the ford dealership again ask them to do an active test , check that the output from each wheel speed sensor is the same , as the output to the DTC socket from the ABS module is shared with the speedo and ECM so should give you a good idea about what is going on

 

do you guys think it might be the uniQ i had fitted?

 

My fez is going to Ford tomorrow to have the CANBUS and wheel sensors checked out - hopefully we'll find the haunting demon!! Wish me luck!

 

whats uniQ?

 

its software (similar to dreamscience) called unichip i.e uniQ. Made by Dastek