C2 Power steering dead

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Boycee41
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Joined: 16 Feb 2024, 14:07

C2 Power steering dead

Post by Boycee41 »

Hi All,
C2 2004 1.4 70k miles.
The power steering suddenly died the other night. The battery has been draining a bit recently during the cold weather was failing to start, and is only really used on short trips of 2 miles 3 or 4 times a week, so assuming it's not getting a full recharge, and have been using a trickle charger. I plugged it into the trickle charger overnight and had the green light on it, so charged ok, tried steering again, still nothing.
I've done a code read, but no codes are showing, and tried re-seating the connector blocks on the ECU for the steering behind the battery, after cleaning the contacts, still no joy.
I've ordered a replacement ECU second hand, just to save time, and remembered I haven't checked the fuse yet, which I'll do tomorrow.
Is it more likely to be the ECU if it's completely dead, or the motor on the rack ?
I'm hoping it's not the motor as it's more work and cost, any clues or tests I can do to determine which is faulty before I dive in with the spanners ?
Also how do the tri lug nuts come off the ECU mounting ?
Thanks
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GiveMeABreak
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Re: C2 Power steering dead

Post by GiveMeABreak »

Before you start down the road of replacing parts, get it properly diagnosed!

It is a mistake to start changing parts without knowing the cause. If you have electric power steering, they rely on the battery providing sufficient minimum voltage to operate.

It needs diagnosing with a Lexia / Diagbox and the fault codes putting up here with your VIN for help. But regardless, if you battery is 5 years old or more - change it.
Please Don't PM Me For Technical Help

Marc
Boycee41
Posts: 2
Joined: 16 Feb 2024, 14:07

Re: C2 Power steering dead

Post by Boycee41 »

Thanks, I've got no codes coming up, I need to sort it as soon as poss, so ordered the ECU, it was only cheap, was trying to avoid buying a battery if it's the motor and rack that need replacing.
I'm thinking the PS would have been intermittent if it was low power on the battery, it just suddenly went off.
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GiveMeABreak
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Re: C2 Power steering dead

Post by GiveMeABreak »

You won't get all fault codes if using a generic OBD scanner and you most likely won't be able to access live data.

The following faults can be read if present from Lexia:
  • Vehicle speed data fault
  • Electric power steering ECU fault
  • Configuration fault
  • Torque sensor information fault
  • Engine speed data fault
  • Supply voltage fault
  • Electric power steering motor fault
  • Electric power steering temperature sensor information fault
  • CAN fault
  • Battery voltage fault
These are the parameters that can be read from the live data:
ParametersParameter status
Vehicle speedValue in km/h
Engine speedValue in rpm
+APC0 = ignition+ not present. 1 = ignition+ present
Torque applied by the driver on the steering wheelValue in Nm (Newton metres)
Measured currentValue in amps
Supply voltageValue in Volts
Assistance0 = no power-assistance. 1 = power-assistance operational
Remember if you are replacing an ECU, it must be configured correctly with the correct Wheel Sizes and whether it has ABS or not etc...
Please Don't PM Me For Technical Help

Marc