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ABS Refurbishment on Porsche 968
Hi All I have been trying to build a post to help anyone with ABS issues so if anyone has any thing to add to this it would be cool
When the ignition is switched on the ABS light on the dash should illuminate.
If the ABS light stays on after engine start there could be a few reasons for this.
1. Brake light Switch Fault
If the light goes out with engine start, then comes on when reaching 3-5 MPH this is caused by a malfunctioning wheel sensor, ground or the sensor.
Wheels sensors will only provide output to an oscilloscope for full diagnosis
but it is possible to test them with a DVM.
Checking the resistance will only show they are not open circuit.
If one sensor puts out a significantly lower voltage than the rest replace it
The ABS sensors can be tested at the ECU cable connection.
Right Front ECU Plug Pins 21 and 11
It is also possible to bridge out the ABS relay G20 / G22 for testing
It is also possible to test the ABS pump Motor by applying 12v to one pin in the ECU plug and one pin in the fuse box With the ECU unplugged.
Apply 12v across pins 28 (ECU Plug) and terminal 87 (ABS Relay fusebox) the
ABS pump should fire into life.
Pins for the ABS Relay
ABS ECU Information
Two ABS ECU's can be used in our cars but don't be fooled by the part numbers, I have had this checked out by OPC in Polaris which is their parts history system.
The ECU that appears on eBay most often
928 618 118 00 is the later ECU fitted to 968, later 928
The later ECU is now only available as an exchange part at the paltry sum of £744.00 plus £200 parts deposit plus VAT
Porsche 944S2, 968 Standard Abs Modulator
Rebuilding the ABS Pump
the one on the left is the 968, and the right hand is a 190E one, the Mercedes one lives in the engine bay so stays nice and warm and dry unlike the daftest place ever in the 944/968 the OS wheel arch!
Basically the same just the brake pipes are all in different places.
Stripping the Merc one.
Undo these big Allen grub screws, 10mm and they are very tight.
The Pistons you need for the rebuild.
All the bits you need removed, Motor, Pistons.
My dead 968 pump.
All cleaned up and rebuilt even the relays on the top of the pump are the same, bosch part number for both the 968 and the Mercedes pumps.
The Mercedes ABS Modulator was £12.00 plus post from ebay, plus a few hours work and 2L of brake fluid, when bleeding the brakes start from the furthest point from the master cylinder.
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