Tampa 928s

85 Euro Lamp on all the time!
Search has not come up with a easy way to diagnose the Abs system. From what I read if the lamp is on it could be a relay issue or module issue. I plan on testing the relay in the Ce but there are two others. Where is the location of the two relays and does anyone have a cheat sheet on how to proceed.

ROG100

Mark,
I hope it is not one of your sensors on the wheels as they are NLA for 84 through 86 cars that had ABS.
Do not mess up any of the sensor wires when you are checking the system and treat them like GOLD DUST.
Roger

Tampa 928s

I heard that if the abs lamp comes on upon startup its not the sensors. I believe you have to drive for a self test and if the lamp comes on it's a sensor. That may not be true if there is a short. I was very carefully when I worked on the car it's been on since the beginning.

blitz928

Relay in position XVII should be the ABS relay.


85-86 Relays

Position


Description


Part #

I-II


Rear Defroster


928.615.115.00

III


Not Used




IV


Ignition Relay-X


141.951.253.B

V


Indicator(turn), 4-Way Flasher


1H0.953.227

VI


Window Winder


928.615.126.00

VII


Intermittent Wiper Delay Timer


993.615.101.00

VIII


Defroster


928.615.203.00

IX


Intensive Washers


928.618.113.01

X


Fresh Air (HVAC) Blower


141.951.253.B

XI


Interference Noise Suppressor


928.618.223.00

XII


Twin-Tone Horns


141.951.253.B

XIII


Foglights


928.615.137.01

XIV


Starter Relay


141.951.253.B

XV


Kick-Down Relay(Auto) thru 86 VIN#0998


928.618.109.00

XV


Kick-Down Relay(Auto) 86 VIN# 09999 and higher


928.618.109.01

XVI


EZF Ignition System


141.951.253.B

XVII


ABS Relay US 86 from VIN#0061/ Euro from 85


928.615.124.01

XVIII


A/C Condensor/Radiator Fan


141.951.253.B

XIX


Headlamp Washers


928.618.111.00

XX


Fuel Pump,O2 Sensor


141.951.253.B

XXI


Interior Light Delay 86 VIN# 09999 and higher


928.618.225.01

XXII


Reverse Light Relay (Auto)


141.951.253.B

XXII


Reverse Light Bridge(5-Speed)


928.615.125.00

XXIII-XXIV


Combination Headlamp


928.618.107.02

XXV


LH-Jetronic Fuel Injection


141.951.253.B

XXVI


Not Used



Relays Not Located in Fuse/Relay Panel
Description Location Part #
Seat Belt / Chime Inside Center Console Under Radio 928.618.102.03
Rear Window Wiper Behind Tool Kit Cover - Drivers Side 928.618.104.00

soupcan

Tampa 928s

Looks like "So Far" my relay is bad XVII anyone have one used?

John Speake

There are two additional relays under the wheelarch cover, drivers side if your Euro is LHD......

Jadz928

Learned soemthing new here. I have what I believe is a bad ABS sensor (or corroded connection) somewhere, on the '84. I will go at them with kit gloves.

For reference, my symptom is the ABS warning light coming on after rolling forward.

Tampa 928s

John do those relays fail in series? The input 15 and 31 when voltage is applied does not close the contacts.

blitz928

On my 87 the abs would come on at 5mph, turned out to be a damaged wire to the passenger front sensor, replaced the sensor, wire could not be spliced. Problem solved.

John Speake

[QUOTE=Tampa 928s;6284500]John do those relays fail in series? The input 15 and 31 when voltage is applied does not close the contacts.[/QUOTE

XVII relay has pin 15 from ignition switched 12v. Pin 31 of relay should go to ground.... MPV

When the relay closes it puts 12v from fuse 16 onto pin 1 of the ABS ECU.

Tampa 928s

If thats true I shoud have a relay closure when applying 12v to pin 15 and 31 and it does not close.

John Speake

Check with an ohmeter that you have a good ground connection from pin 31. (less that 1 ohm)

Then switch on ignition and check you have 12v at pin 15.

Plug in the relay and probe on the relay socket to double check that with ignition on you have 12v on 15 and 0v on pin 31.

If so, the relay should close the contacts.

Tampa 928s

John
I bench tested it with my variable power supply also the zener diode shows good so it is not shorting to ground. I think the primary coil winding is open.

John Speake

OK, that seems pretty conclusive...... have a look at the coil connections and see if any poor joints.... ?