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I have a 2010 IC CE School Bus Wabco Meritor ABS. ABS, Trac,

Customer Question
Yield sign on as is...
I have a 2010 IC CE School Bus Wabco Meritor ABS. ABS, Trac, Yield sign on as is the usual with ABS problems. I have a little Bendix RDU that reads Left, Sensor, Drive Axle. I have cleared it and comes back immediately. Went back to the alleged wheel Inspected
sensor and cleaned and pushed back in all the way touching tone ring Inspected tone ring in perfect condition no obstructions Checked wheel end bearing play- no play wheel spins freely Disconnected sensor to test and read varying .25vac when spinning wheel
Checked sensor leads to ground- not grounded Swapped sensor with known good sensor no change Checked wiring from brake brain at sensor connector (disconnected) with key on 5v reference on one lead other grounded Checked wiring at connector before the brake
brain- wheel sensor .25vac varying readings go through the connector ok. Also inspected connections looks good. DC voltage with everything hooked up and key on is 2.7 on 5v reference lead and 2.2 on grounded side. Don't know what to do???
Submitted: 2 years ago.Category: Medium and Heavy Trucks
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Answered in 3 hours by:
8/31/2015
Technician: Andy, Truck Diagnostic Technician replied 2 years ago
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1,752
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter
Verified

Hi there ! My name is Andy ! Can we start with the last 8 digit of the Vin number please along with the fault code you have for the ABS ! Thanks

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Technician: Andy, Truck Diagnostic Technician replied 2 years ago

Do you still need help with this?

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Customer reply replied 2 years ago
AB176117. I don't have a scanner at this time. Is it possible to obtain a code some other way?
Technician: Andy, Truck Diagnostic Technician replied 2 years ago

https://www.dropbox.com/s/tk6fbao5geml169/checking%20body%20controller%20faults.txt?dl=0

Try this !

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Technician: Andy, Truck Diagnostic Technician replied 2 years ago

Any luck with this?

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Customer reply replied 2 years ago
Hi,
Here they are. Hope you can translate this into English.Software Rev: 4.2
Hardware Rev: C
Active Codes: 0
Total Codes: 4SPN: 7264 FMI 11
Previously Active
OC: 0 SA: 0
CONN/PIN: ---------: NASPN: 2000 FMI: 19
Previously Active
OC: 3 SA: 33
CONN/PIN: N/ASPN: 4012 FMI: 6
Previously Active
OC: 6 SA: 33
CONN/PIN: 1604KSPN: 520803 FMI: 5
Previously Active
OC: 22 SA: 33
CONN/PIN: 1601F1
Technician: Andy, Truck Diagnostic Technician replied 2 years ago

7264 11 - Glowplug relay circuit fault, source address 0 means this code came from the engine ECM

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Technician: Andy, Truck Diagnostic Technician replied 2 years ago

33 source address means code comes from body controller

SPN- 2000 FMI- 19

message
not Received from
Engine
ECM not Programmed
for Aftertreatment,
Faulty ECM, or Faulty
Drivetrain Data Link

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Technician: Andy, Truck Diagnostic Technician replied 2 years ago

This one is from body controller too

4012-6 - Right High Beam
Short To Ground
Short To Ground or
Overload in Right High
Beam Circuit

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Technician: Andy, Truck Diagnostic Technician replied 2 years ago

520803-5 -Park Brake Relay under Current or open circuit- Could be a defective solenoid

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Customer reply replied 2 years ago
The brake is from disconnecting connector with key on.
Does all the information go into the Wabco unit and then go to which computer the one in the engine compartment or another one?
Would it be advisable to swap brake brains off a sister bus to see if that's where the problem lies?
Does the brake brain have the relays inside it that relate to abs?
Need some ideas to check out stuff.
Thanks
Technician: Andy, Truck Diagnostic Technician replied 2 years ago

I will try and locate the troubleshooting manual for you !

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Customer reply replied 2 years ago
Thanks. Can't seem to clear codes. Set a new code.
Spn 2003. Fmi 9
Oc 1. sa. 23
Conn/pin ------na
Technician: Andy, Truck Diagnostic Technician replied 2 years ago

https://www.dropbox.com/s/cundzyr1a6sd5nt/wabco%20full%20power%20brakes%202004.pdf?dl=0

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Customer reply replied 2 years ago
Thanks. I didn't get the last pages of repair instructions. There are supposed to be 20 and I got 14 out of the 20.
Technician: Andy, Truck Diagnostic Technician replied 2 years ago

Oh Ok ! Let me try again !

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Technician: Andy, Truck Diagnostic Technician replied 2 years ago

https://www.dropbox.com/s/cundzyr1a6sd5nt/wabco%20full%20power%20brakes%202004.pdf?dl=0

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Customer reply replied 2 years ago
Guess it just doesn't have the last pages. I'm going to test all other sensors just to make sure they're all good.
Customer reply replied 2 years ago
All wheel speed sensors have ac voltage and ohm 1200. Decided to check codes after startup and drive 5-10 mph leave engine running got spn 791 fmi 7 oc 55 sa11. Hope this isn't just from disconnecting with key on but did that with right rear too and no other codes.
Customer reply replied 2 years ago
Did the clear code. I think it may have cleared the active code. Then drive again got spn 791 fmi 7 oc 57 sa 11
Technician: Andy, Truck Diagnostic Technician replied 2 years ago

Ok so are all active codes gone now ?

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Customer reply replied 2 years ago
Well if I clear yes. Abs & trac will stay on but the yield sign goes out. Ecu is waiting for speed test confirmation so drive 5-10 mph and yield sign Comes back on active code pops up 791/7. OC I'm guessing is the number of times this has occurred because it keeps going up each time.
Technician: Andy, Truck Diagnostic Technician replied 2 years ago

That is correct ! Oc is for occurences . Do we know what the code is for ?

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Andy
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1,752
1,752 Satisfied Customers
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter

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