Citroen Synergie engine idle speed 1400 rpm capped at 3000 rpm!!
Variant: 2.0 HDI
Model Year: 2000
Categories:
Engine & Drivetrain
My Synergie 2.0 HDI randomly raises it's idle engine speed from normal 800 rpm to 1400 rpm and goes into a type of limp mode capping at 3000 rpm, this returns to normal when engine is switched off. This can happen within a mile or three miles of driving. The garage code reader showed P00C8 (Fuel pressure regulator- voltage supply- open circuit) there are no dashboard warning lights. The garage is not convinced this the correct diagnosis code after doing various checks. The car starts very well and runs and pulls well when running normal, Fuel filter has been changed recently, air flow meter and fuel pump renewed in 2012. mileage on car 173000. Can any one help with this problem, Thank you.
Posted: Sep 16, 2016 (8 years ago)
Given the fault code and the fact that that could cause your symptoms I'd be chasing that.
But bear in mind it's not the FRPS that's at fault but the electrical supply.
Open circuit means basically not connected/supplied with voltage.
If memory serves it's a 5V supply from the ECU to the FRPS so it's check the V at the ECU through the wire to the FRPS.
Oh and by check I mean loaded with voltage.
Not just putting a multimeter on the wire ends,
that's useless,
French cars can rot the inside of the wires to green and still carry V
If it were here now I'd DISSCONNECT both ends of the harness
And then connect up a jumper wire/21W indicator bulb from the battery to the ground.
If the wire's good the bulb SHOULD glow brightly,
If it doesn't or glows dim the wire is at fault.
And believe me it would not be the first French car to suffer from bad wires.
But bear in mind it's not the FRPS that's at fault but the electrical supply.
Open circuit means basically not connected/supplied with voltage.
If memory serves it's a 5V supply from the ECU to the FRPS so it's check the V at the ECU through the wire to the FRPS.
Oh and by check I mean loaded with voltage.
Not just putting a multimeter on the wire ends,
that's useless,
French cars can rot the inside of the wires to green and still carry V
If it were here now I'd DISSCONNECT both ends of the harness
And then connect up a jumper wire/21W indicator bulb from the battery to the ground.
If the wire's good the bulb SHOULD glow brightly,
If it doesn't or glows dim the wire is at fault.
And believe me it would not be the first French car to suffer from bad wires.
Posted Sep 17, 2016 (8 years ago)
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