ABS - Intermittent Warning Lamp Illumination
NO.: 05-01-93GROUP: Brakes
DATE: Jan. 13, 1993
SUBJECT:
Intermittent ABS Amber Warning Lamp Illumination
MODELS:
1993 (LH) Concorde/Intrepid/Vision
SYMPTOM/CONDITION:
Electrical "noise" created by some combination of accessories, may cause the illumination of the ABS amber warning lamp in the instrument panel.
DIAGNOSIS:
Using the DRBII (scan tool) and the applicable diagnostic procedure manual, check for diagnostic fault messages. If a "main relay/power circuit" fault is stored in memory, perform the repair procedure below. If other fault messages are present, diagnose and repair as required.
PARTS REQUIRED:
1 Polyamid Adaptor Kit (adaptor, two screws and adhesive patch)
ABS equipped 4741412
ABS with traction control equipped 4741411
REPAIR PROCEDURE:
This bulletin involves replacing the Electronic Control Unit (CAB) aluminum adaptor with a polyamid adaptor and installing an adhesive patch.
Check for the presence of an aluminum adaptor between the Electronic Control Unit (CAB) and the housing of the Hydraulic Control Unit (HCU). If an aluminum adaptor is present, proceed to the repair procedure. If a polyamid plastic adaptor is present, proceed to step 17 in the repair procedure.
NOTE:
FOLLOWING THIS PROCEDURE WILL ENSURE THAT THE BRAKE SYSTEM HYDRAULIC CIRCUITS REMAIN CLOSED. DO NOT DISCONNECT ANY OF THE BRAKE TUBES ON THE HYDRAULIC UNIT.
1. With the ignition in the OFF position, disconnect the negative battery cable.
2. Remove the HCU/CAB heat shield -- two screws one at forward end of shield and one at the rear.
3. Disconnect 37-way CAB connector, Fluid Level Switch II connector (mini reservoir on HCU) and pump motor connector (on HCU pump).
4. Remove the three Hydraulic Control Unit (HCU) mounting nuts. One nut is located at the forward end of the unit and two are facing the dash panel area.
5. By slightly rotating the HCU counter clockwise, (looking at the HCU while standing in front of the vehicle) the HCU unit can be removed from the bracket.
6. It is now possible to remove the two CAB TORX mounting bolts (bolts face shock tower on either side of CAB label).
7. Remove the CAB by gently prying it away from the Hydraulic Control Unit (HCU) to separate the 14-way connector at the base of the CAB (do not wiggle, damage to the connector could result).
8. Install adhesive patch on the Hydraulic Control Unit (HCU) side of the Electronic Control Unit (CAB) as shown in the drawing.
9. Remove the aluminum adaptor block. (This is between the HCU and CAB). There are two T30 TORX head bolts that hold the adaptor to the HCU.
10. This aluminum adaptor can now be replaced with the polyamid adaptor along with the new bolts in the kit (female indentations in the adaptor mate to male nibs on the HCU). Torque these two bolts to 10-14 N-m (88-124 in.lbs.).
11. The CAB can now be installed onto the HCU in the same manner as it was removed. Torque the CAB mounting bolts to 10-14 N-m (88-124 in.lbs.).
12. In order to install the HCU into the HCU bracket, it will be necessary to slightly rotate the HCU counter-clockwise while pulling the unit into the bracket. This allows for clearance between the bottom corner of the CAB and the HCU bracket.
13. Install the three HCU nuts and tighten to 18-26 N-m (13-19 ft.lbs.).
14. Connect the 37-way connector, Fluid Level Switch II connector, and pump motor connector.
15. Install heat shield.
16. Connect negative battery cable.
17. If the polyamid adaptor is already present, tighten the two vertical screws located on either side of the 37-way connector on the CAB to a torque of 2 +/- 0.15 N-m (18 +/- 1 in.lbs.).
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No.
Retorque CAB vertical screws 05-40-07-94 0.3 Hrs.
Replace aluminum adaptor 05-40-07-95 1.0 Hrs.
FAILURE CODE:
P8 - New Part