Gen1 ABS Test - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 20 (permalink) Old 07-14-2020, 12:58 AM Thread Starter
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Gen1 ABS Test

Hi All,
2005 FJR, solid ABS light.
Changed the brake fluid, cleaned the front and rear sensor.
Battery is charged at 12.86 volts.
Alligator clipped the coupler to diagnose.
Checked the ABS 7.5 amp fuse in the fuse box.
I don't get any pulses or error codes on the LCD.

So my process, in case i've screwed up (which is likely!)
1. Bike on center stand and in neutral.
2. Coupler clipped (skyblue and black wires)
3. Ignition kill switch to off.
4. Turned on key ignition and wait 2 seconds.
5. Hold starter in for approx 3 seconds (counting) and then release whilst simultaneously
6. Holding in Front brake and Rear brake pedal.
I get absolutely nothing.
No pump, no pulse,no click and no read out on screen indicating anything.

Also tried,
1. Ignition killswitch to on
2. Hold in Front brake and Rear brake pedal
3. Key ignition to on
Same result, no feedback, nothing.

Now i'm thinking ok if the ABS pump is cactus, then ok maybe i'll get no pulses etc.
But surely I'd get an error code or something to indicate that, yeah your screwed.

I'm at a loss, can anyone out there help?
Thank you in advance!

Dunc.
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post #2 of 20 (permalink) Old 07-14-2020, 03:12 AM
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What was happening immediately before you first noticed that the ABS light was on??

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post #3 of 20 (permalink) Old 07-14-2020, 03:19 AM Thread Starter
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Hi Bernie, Normal riding mate.
Nothing out of the usual.
Got on it to head home after work and then voila ABS solid light.

BTW just checked the 30 amp fuse for the ABS motor and all ok there.
Also bled the rear brake again and went through at least five full reservoirs of fluid.
Some discolouration coming out.

Question: does cycling the fluid from the reservoir to the back brake go through the ABS pump?...i.e. is that a good way to loosen things up?
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post #4 of 20 (permalink) Old 07-14-2020, 07:24 AM
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Quote:
Originally Posted by DunJen View Post
Question: does cycling the fluid from the reservoir to the back brake go through the ABS pump?...i.e. is that a good way to loosen things up?
No, you need to get the pump to run to get fresh fluid into the pump.

FJR Models owned from new, 2001, 2003, 2006, 2009, 2011, 2014.
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post #5 of 20 (permalink) Old 07-14-2020, 09:09 AM
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If the 30 amp fuse is good, and the ABS pump won't run at all, chances are the relay is not functioning to make the pump run... I think it's called FailSafe Relay, should be near the pump or at least accessible under the right side cover perhaps (admittedly I have not worked on Gen1 ABS).
When running the test, you should hear the relay click back there.... the usual, check connections.
When the pump runs, test sequence started, there should be pulses felt in both the lever and the rear pedal.... chances are the front will pulse, the rear may not as it was the most prone to not function.
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2014 FJR1300A - Root Beer (sold)
2009 CBF1000A - Sienna Red
1999 VFR800Fi - Pearl Shining Yellow
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post #6 of 20 (permalink) Old 07-14-2020, 10:19 AM
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Quote:
Originally Posted by DunJen View Post
Hi All,
2005 FJR, solid ABS light.
Changed the brake fluid, cleaned the front and rear sensor.
Battery is charged at 12.86 volts.
Alligator clipped the coupler to diagnose.
Checked the ABS 7.5 amp fuse in the fuse box.
I don't get any pulses or error codes on the LCD.

So my process, in case i've screwed up (which is likely!)
1. Bike on center stand and in neutral.
2. Coupler clipped (skyblue and black wires)
3. Ignition kill switch to off.
4. Turned on key ignition and wait 2 seconds.
5. Hold starter in for approx 3 seconds (counting) and then release whilst simultaneously
6. Holding in Front brake and Rear brake pedal.
I get absolutely nothing.
No pump, no pulse,no click and no read out on screen indicating anything.

Also tried,
1. Ignition killswitch to on
2. Hold in Front brake and Rear brake pedal
3. Key ignition to on
Same result, no feedback, nothing.

Now i'm thinking ok if the ABS pump is cactus, then ok maybe i'll get no pulses etc.
But surely I'd get an error code or something to indicate that, yeah your screwed.

I'm at a loss, can anyone out there help?
Thank you in advance!

Dunc.
i had the same thing when the bike is on the center stand the light just comes on just ride it for a minute going like 50kmh will fix it if it hasn't there is another issue

Sven
1998 Kawasaki KDX 200
1982 Suzuki GSXL 750
1998 Honda shadow vt 600
1996 BMW f 650 Funduro
2005 Yamaha fjr1300a
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post #7 of 20 (permalink) Old 07-14-2020, 10:38 AM
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The Method 2 test in my FSM specifically says to hold the starter button for "> 4 seconds". I always count to 6. 3 may not be long enough. https://www.dropbox.com/s/30u7d9l6ao...0%20A.pdf?dl=0. Same with the ignition on/wait. Be patient! Wait 3 seconds.

The first picture below shows the jumper applied at the test coupler. "Sky Blue" to me is misleading. It's light blue with brown dots on my bike. Note the horizontal orientation of the pins in the second pic.
Attached Images
File Type: jpg IMG_20200524_115942879.jpg (90.4 KB, 11 views)
File Type: jpg 5.jpg (98.8 KB, 13 views)

Russ
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post #8 of 20 (permalink) Old 07-15-2020, 12:05 AM Thread Starter
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The advice is very much appreciated guys.
I'll run through the process again for the test tonight after work.
From memory I'm not hearing anything from the abs relay at all.
Is there a way to test the relay using a multimeter etc ?
Or should I just throw some cash at a new one?

Given that its probably the OEM, its probably not a bad idea nyway.
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post #9 of 20 (permalink) Old 07-15-2020, 05:05 AM Thread Starter
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Ok.
So got home from work and pulled the ABS relay.
Cleaned the contacts and found a small amount of corrosion on one of the posts.


Cleaned that away with contact cleaner.

Reinstalled the relay
The relay clicks when turning on the ignition key a couple of times as the fjr intialises.
Ensured that the coupler was shorted properly



I had another crack at running the test with method one and method two.
Run the tests....nothing.
No codes no pulses and no further clicks from the relay.
Could this still mean its cactus?
I guess perhaps only part of the relay may be functioning?

A new relay will cost me $139 aud shipped.

I'm tempted to bolt the thing together and just ride it and maybe the abs will come good?
Dammit.

Last edited by DunJen; 07-15-2020 at 05:10 AM.
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post #10 of 20 (permalink) Old 07-15-2020, 09:22 AM
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That is one expensive relay.... unfortunately a multi-function one... if you're handy and have the wiring diagram from the FSM, perhaps undo the connectors to the ABS motor/solenoids, see if the relay is transferring power on the output side (to the motor). which likely is red and red/white, black being ground. That would help establish the relay is good.
It is odd you don't have the motor/solenoids working on at at all or least the front, but the Gen1 was a different animal.
If the relay is good, and still doesn't function, all connections clean, I don't hold much hope of reviving a hydraulic unit....... in the old days there were those who got faulty solenoid (servos) working, but most had clogged up passages.... if you're ambitious and electrically inclined, you could dive into the hydraulic unit deeper.......

Ray
Keep yer stick on the ice....
2014 FJR1300A - Root Beer (sold)
2009 CBF1000A - Sienna Red
1999 VFR800Fi - Pearl Shining Yellow
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