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Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 21618
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Vitara: Hiya I have a grand vitara 1.9 ddis, problem is trouble

Customer Question

Hiya I have a grand vitara 1.9 ddis, problem is trouble starting, when driving will cutout, fault code poo89 found in ecu, have replaced pump in tank, filter and high pressure pump any ideas
Submitted: 2 years ago.
Category: UK Car
Expert:  Matt replied 2 years ago.

to get the P0089 fault then its a problem with fuel pressure ( which you probably already know)
it can be too high or low a pressure though see here

can I ask if you have measured the fuel pressure at the injectors , on a running engine ? as this will give a better idea of where the issue lies
Customer: replied 2 years ago.
I have a solus pro snap on scanner and the desired fuel pressure when running matches the actual pressure
Expert:  Matt replied 2 years ago.
Hello Carl

OK well that doesn't make much sense then

as to raise the fault code then the measured fuel pressure is outside the desired range

what may be happening is if the pressure sensor is faulty or if it has a bad connection or faulty wiring then you may be getting a 'noisy ' signal that is fooling the ECU into producing the fault code

So I'd suggest checking the sensor connections 1st and clean with contact cleaner ( not WD40) and check over the wiring for damage

if this is OK then I'd replace the fuel pressure sensor
Customer: replied 2 years ago.

As relating the fuel pressure sensor, do you mean fuel rail pressure sensor??

Expert:  Matt replied 2 years ago.
Hello Carl

yes thats the one as its the main control for the system
Expert:  Matt replied 2 years ago.

do you still need help?