Jeep XJ. Manual — part 569
5. If there are no diagnostic trouble codes present,
select “Inputs/Outputs” and read the brake
switch input as you press and release the brake
pedal. If the display does not match the state of
the pedal, perform appropriate test. Read the
“G-Switch” status, with the vehicle on a level
surface, both switches should read “CLOSED”. If
the status is not correct, perform appropriate
test. If a problem with the amber ABS warning
indicator exists, refer to the system tests.
6. If no other problem are found, it will be neces-
sary to road test the vehicle. THE DRB MUST
NOT BE CONNECTED TO THE DATA LINK
CONNECTOR WHEN ROAD TESTING FOR
PROPER ANTILOCK OPERATION. THE
SYSTEM IS DISABLED WHILE IN DIAG-
NOSTIC MODE. Perform several antilock stops
from above 50 Km/h (30 mph) and then repeat
steps 2, 3, and 4. If any diagnostic trouble codes
are present, proceed to the appropriate test.
7. The following conditions should be considered
NORMAL operation, and no repairs should be
attempted to correct them.
– Brake pedal feedback during an ABS stop
(clicking, vibrating)
– Clicking, groaning or buzzing at 10 Km/h (6
mph) (drive off self test)
– Groaning noise during an ABS stop
– Slight brake pedal drop and pop noise when
ignition is initially turned on
– Brake pedal ratcheting down at the end of an
ABS stop
8. If the complaint is ABS “cycling” at the end of a
stop at low speeds, it may be caused by a
marginal wheel speed sensor signal. The sensor
air gap, tone wheel condition, and/or brakes
hanging up are possible causes of this condition.
9. After a road test in which problems were found,
refer to any Technical Service Bulletins that may
apply.
5.0
REQUIRED TOOLS AND
EQUIPMENT
DRBIII
t (diagnostic read-out box)
jumper wires
ohmmeter
voltmeter
test lamp
6.0
GLOSSARY OF TERMS
ABS
antilock brake system
AC
alternating current
BCM
Body Control Module
CAB
controller − antilock brake
CCD
Chrysler Collision Detection
DC
direct current
DLC
data link connector
DRB
diagnostic read-out box
EDW
electrical distribution wiring
EMI
electro magnetic interference
HCU
hydraulic control unit
HZ
Hertz
ISO
International Standards
Organization
JBLK
junction block
JTEC
Jeep and Truck Engine Controller
LF
left front
LR
left rear
PCM
Powertrain Control Module
PDC
power distribution center
P/M
pump motor
RF
right front
RR
right rear
RFI
radio frequency interference
SCI
Serial Communication Interface
SOL
Solenoid
WSS
Wheel Speed Sensor
7
GENERAL INFORMATION
NOTES
8
7.0
DIAGNOSTIC INFORMATION AND
PROCEDURES
9
Symptom:
CAB POWER FEED CIRCUIT
When Monitored and Set Condition:
CAB POWER FEED CIRCUIT
When Monitored:
Ignition on. The CAB monitors the Fused B(+) circuit at all times for
proper system voltage.
Set Condition:
If the Fused B(+) voltage is missing when the CAB detects that an internal
main driver is not
9on9, the Diagnostic Trouble Code (DTC) is set.
POSSIBLE CAUSES
INTERMITTENT DTC
BLOWN FUSE - FUSED B(+) CIRCUIT
FUSED B(+) CIRCUIT OPEN
FUSED B(+) CIRCUIT INTERMITTENTLY SHORTED TO GROUND
FUSED B(+) CIRCUIT SHORTED TO GROUND
NO B+ SUPPLY TO FUSE
CAB - FUSED B(+) CIRCUIT OPEN
CAB - FUSED B(+) CIRCUIT SHORTED TO GROUND
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, erase DTC’s.
Turn the ignition off.
Turn the ignition on.
Drive the vehicle above 25 km/h (15 mph) for at least 10 seconds.
Stop the vehicle.
With the DRBIII
t, read DTC’s.
Does the DRBIII
t display CAB Power Feed Circuit DTC present right now?
All
Yes
→
No
→
Test Complete.
2
Turn the ignition off.
Remove and Inspect the ABS Solenoid Fuse #13 in the Power Distribution Center
(PDC).
Is the Fuse blown?
All
Yes
→
No
→
10
BRAKES (CAB)
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