Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 78
display does not match the state of the pedal,
perform the proper test. For a problem with the
“ABS” warning indicator, refer to the proper test.
6. If no other problems are found, it will be neces-
sary to road test the vehicle. THE DRBIII
t
MUST NOT BE CONNECTED TO THE
DATA LINK CONNECTOR WHEN ROAD
TESTING FOR PROPER ANTILOCK OP-
ERATION. THE SYSTEM IS DISABLED
WHILE IN DIAGNOSTIC 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 12 Km/h (8
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 no 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 light
oscilloscope
6.0
GLOSSARY OF TERMS
ABS
antilock brake system
AC
alternating current
BCM
body control module
BS
brake switch
BLS
brake lamp switch
CAB
controller antilock brake
DC
direct current
DLC
data link connector
DRBIII
t
diagnostic read-out box
DTC
diagnostic test code
EBD
electronic brake distribution
ECM
electronic control module
HCU
hydraulic control unit
HZ
Hertz
IC
instrument cluster
LF
left front
LR
left rear
PM
pump motor
RF
right front
RR
right rear
SOL
solenoid
TCS
traction control system
TCSS
traction control system switch
VSS
vehicle speed signal
WSS
wheel speed sensor
7
GENERAL INFORMATION
NOTES
8
7.0
DIAGNOSTIC INFORMATION AND
PROCEDURES
9
Symptom List:
ANTI-LOCK BRAKE MODULE INTERNAL
CAB INTERNAL
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be ANTI-LOCK BRAKE MODULE
INTERNAL.
When Monitored and Set Condition:
ANTI-LOCK BRAKE MODULE INTERNAL
When Monitored:
Ignition On - Continuously.
Set Condition:
When there is a deviation from the expected result of a CAB internal self
check.
CAB INTERNAL
When Monitored:
Ignition On - Continuously.
Set Condition:
When there is a deviation from the expected result of a CAB internal self
check.
POSSIBLE CAUSES
INTERMITTENT CAB INTERNAL DTC
DAMAGED CAB/CAB HARNESS CONNECTOR
FUSED OPTIONAL EQUIPMENT RELAY OUTPUT CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
GROUND CIRCUIT OPEN
ANTI-LOCK BRAKE CONTROLLER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
With the DRBIII
t, erase DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIII
t, read DTCs.
Does this DTC reset?
All
Yes
→ Go To 2
No
→ Go To 6
10
BRAKES (CAB)
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