Guys I know starting a new thread on this is just a pain in the a.., but I could really use some help here. I started getting the dreaded "service abs" on my 2000 vert. At first it would go on then off every year or so, then every month, now daily I get "service abs" and I just clear the codes and hope for the best. I pulled the codes today and got C1225 C1243 IPC 0521 bo-rfa 1096 1064 1016 I then cleared them. After clearing and restarting I got the C1243. Please help! I would appreciate any of it. P.S. I don't know where some of the modules are that are referenced in the prior posts. Please direct me to the posts that my show pics for the visual man that I am

 

Read this thread.
http://forums.corvetteforum.com/c5-t...c-c1243-h.html

 

Thanks for the link, pics help a ton, I have not even removed the wiring to that area because I did not know exactly where it was. My battery is a few years old optima and sometimes I do get what I consider low voltages on my readout> I have never had a low voltage light or anything like than. According to the link it sounds like most likley my problem is electrical and not mechanical with the pump because I rarely activate my traction control. Any thoughts?

 

I had this code as well a couple of times. I took the EBTCM off the BPMV and manually powered the motor and it did help but the code came back a couple of times. It was then that I thought of checking the battery itself and found it was low. I charged it really well for days on a Ctek, then ran things again, no code. So it appeared a weak battery was my cause.

 

Thanks for your help. I will try that 1st. In my case I like the "keep it simple stupid" approach. P.S. Thanks for your service to our country I greatly respect and appreciate it!

 

Every time the car is started, it runs thru dialogistic steps and one of those steps it actuates the pump motor to check for speed (current draw) and will set the C1243 if it is not within spec. If it’s not a battery issue, check maxi fuse 52 in the under hood fuse panel. Also check the ground connection at the frame rail next to the pump.
A little more from the manual:

DTC C1243 BPMV Pump Motor Stalled

Circuit Description
When the pump motor relay is grounded by the EBCM, it closes and provides battery voltage to operate the pump.

Conditions for Setting the DTC
DTC C1243 can be set when the pump motor relay has been commanded off after the pump motor has been on. A malfunction has occurred if the pump motor was on, and the EBCM sensed a stuck or slowly turning pump motor.

Action Taken When the DTC Sets
ABS/TCS/Active Handling (if equipped with RPO JL4) are disabled.

Indicators that turn on:
ABS indicator
Car Icon (TCS indicator)
Messages displayed on the DIC:
Service ABS
Service Traction System
Service Active HNDLG (if equipped with Active Handling RPO JL4)
Conditions for Clearing the DTC
Condition for DTC is no longer present and scan tool clear DTC function is used.
Fifty ignition cycles have passed with no DTCs detected.
Diagnostic Aids
It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation.
If an intermittent malfunction exists refer to Testing for Electrical Intermittents in Wiring Systems.
Test Description
The numbers below refer to step numbers on the diagnostic table.

Checks for good pump motor ground.

Checks for good pump motor ground through the BPMV.

DTC C1243 BPMV Pump Motor Stalled Step
1Was the Diagnostic System Check performed?

Go to Step 2
Go to Diagnostic System Check - ABS

2 Is DTC 1217 also set as a current DTC?
--
Go to DTC C1217 Pump Motor Relay Contact Circuit Open
Go to Step 3

3 Turn the ignition switch to the OFF position.
Using the J 39200 DMM, measure the resistance between the pump motor ground stud and a good chassis ground.
Is the resistance within the range specified in the value(s) column?
0-2 ohms
Go to Step 4
Go to Step 9

4 Disconnect the EBCM connector.
Remove the EBCM from the BPMV.
Inspect the EBCM to BPMV connector for conditions which could cause intermittents, such as damage, corrosion, poor terminal contact, or presence of brake fluid.
Is connector OK and cavity free of brake fluid?
--
Go to Step 5
Go to Step 6

5 Install the J 41247 Pinout Box to the BPMV connector.
Using the J 39200 DMM, measure the resistance between the J 41247 terminal 8 and the pump motor ground stud.
Is the resistance within the range specified in the Value(s) column?
0.2-10 ohms
Go to Step 7
Go to Step 8

6 If connector corrosion or damage is evident, replace BPMV and/or EBCM as necessary.
If brake fluid is present, replace BPMV and EBCM.
Is the replacement complete?
--
Go to Diagnostic System Check - ABS

7 Replace the EBCM. Refer to Electronic Brake Control Module (EBCM) Replacement .

Is the replacement complete?
--
Go to Diagnostic System Check - ABS

8 Replace the BPMV. Refer to Brake Pressure Modulator Valve (BPMV) Replacement .

Is the replacement complete?
--
Go to Diagnostic System Check - ABS

9 Repair open or high resistance in CKT 1250. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

 

Thanks Sam, I will try the battery and then go through these steps one by one and let Y'all know what I find.