ABS MERCEDES-BENZ SPRINTER 2006 Owner's Guide

Symptom:
CAB CHECK SUM
When Monitored and Set Condition:
CAB CHECK SUM
When Monitored: Ignition On - Once
Set Condition: When the sum of all storage bytes are not equal to the original sum stored.
POSSIBLE CAUSES
INTERMITTENT CAB CHECK SUM 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 DRBIIIt, read DTCs.
With the DRBIIIt, erase DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIIIt, read DTCs.
Does the DRBIIItdisplay CAB CHECK SUM?All
Ye s!Go To 2
No!Go To 6
2 Turn the ignition off.
Disconnect the CAB harness connector.
Inspect the CAB/CAB harness connector for damage.
Is there any broken, bent, pushed out, corroded or spread terminals?All
Ye s!Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 3
21
BRAKES (CAB)

TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the CAB harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused Optional Equipment
Relay Output circuit at the CAB harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s!Go To 4
No!Repair the Fused Optional Equipment Relay Output circuit for an
open.
Perform ABS VERIFICATION TEST - VER 1.
4 Turn the ignition off.
Disconnect the CAB harness connector.
Using a 12-volt test light connected to ground, check both Fused B(+) circuits at the
CAB harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s!Go To 5
No!Repair the Fused B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
5 Turn the ignition off.
Disconnect the CAB harness connector.
Using a 12-volt test light connected to 12-volts, check the CAB harness connector
Ground circuits.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s!Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No!Repair the Ground circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
6 Turn the ignition off.
Visually inspect the related wiring harness.
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out, or corroded terminals.
Were any problems found?All
Ye s!Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No!Test Complete.
22
BRAKES (CAB)
CAB CHECK SUM ÐContinued

Symptom:
CAB OPTION
When Monitored and Set Condition:
CAB OPTION
When Monitored: Ignition On - Once
Set Condition: When the vehicle line information transmitted does not match the
expected values.
POSSIBLE CAUSES
INTERMITTENT CAB OPTION 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 DRBIIIt, read DTCs.
With the DRBIIIt, erase DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIIIt, read DTCs.
Does the DRBIIItdisplay CAB OPTION?All
Ye s!Go To 2
No!Go To 6
2 Turn the ignition off.
Disconnect the CAB harness connector.
Inspect the CAB/CAB harness connector for damage.
Is there any broken, bent, pushed out, corroded or spread terminals?All
Ye s!Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 3
23
BRAKES (CAB)

TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the CAB harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused Optional Equipment
Relay Output circuit at the CAB harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s!Go To 4
No!Repair the Fused Optional Equipment Relay Output circuit for an
open.
Perform ABS VERIFICATION TEST - VER 1.
4 Turn the ignition off.
Disconnect the CAB harness connector.
Using a 12-volt test light connected to ground, check both Fused B(+) circuits at the
CAB harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s!Go To 5
No!Repair the Fused B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
5 Turn the ignition off.
Disconnect the CAB harness connector.
Using a 12-volt test light connected to 12-volts, check the CAB harness connector
Ground circuits.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s!Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No!Repair the Ground circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
6 Turn the ignition off.
Visually inspect the related wiring harness.
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out, or corroded terminals.
Were any problems found?All
Ye s!Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No!Test Complete.
24
BRAKES (CAB)
CAB OPTION ÐContinued

Symptom:
CAN COMMUNICATION ERROR
POSSIBLE CAUSES
CAN DTCS PRESENT IN OTHER MODULES
INTERMITTENT CAN COMMUNICATION ERROR DTC
DAMAGED CAB/CAB HARNESS CONNECTOR
CAN CIRCUIT(S) SHORT TO VOLTAGE
CAN CIRCUIT(S) SHORTED TOGETHER
CAN CIRCUIT(S) SHORT TO GROUND
CAN CIRCUIT(S) OPEN
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.
NOTE: Diagnose any Steering Angle Sensor DTCs that are present in this
module before continuing.
With the DRBIIIt, read DTCs in the Engine Control Module, Transmission Control
Module, and Instrument Cluster.
Are there any CAN communication DTCs present in any of these modules?All
Ye s!Refer to the diagnostic procedures for any CAN DTCs in ECM,
TCM and Cluster before proceeding with this test.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 2
2NOTE: If a system undervoltage or overvoltage DTC is set along with this
DTC, diagnose the system voltage DTC first.
Turn the ignition on.
With the DRBIIIt, erase DTCs.
Turn the ignition off.
Start the engine.
With the DRBIIIt, read DTCs.
Does this DTC reset?All
Ye s!Go To 3
No!Go To 11
3 Turn the ignition off.
Disconnect the CAB harness connector.
Inspect the CAB/CAB harness connector for damage.
Is there any broken, bent, pushed out, corroded or spread terminals?All
Ye s!Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 4
25
BRAKES (CAB)

TEST ACTION APPLICABILITY
4 Turn the ignition off.
Disconnect the CAB harness connector.
Turn the ignition on.
Measure the voltage of the CAN(+) circuit.
Measure the voltage of the CAN(-) circuit.
Is the voltage above 3.0 volts for either circuit?All
Ye s!Repair the CAN circuit(s) for a short to voltage.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 5
5 Turn the ignition off.
Disconnect the CAB harness connector.
Measure the resistance between ground and the CAN(+) circuit.
Measure the resistance between ground and the CAN(-) circuit.
Is the resistance below 5.0 ohms for either circuit?All
Ye s!Repair the CAN circuit(s) for a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 6
6 Turn the ignition off.
Disconnect the CAB harness connector.
Measure the resistance between the CAN(+) circuit and the CAN(-) circuit.
Is the resistance below 5.0 ohms between the circuits?All
Ye s!Repair the shorted CAN circuit(s).
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 7
7 Turn the ignition off.
Disconnect the Engine Control Module harness connector.
Disconnect the CAB harness connector.
Measure the resistance of the CAN(+) circuit.
Measure the resistance of the CAN(-) circuit.
Is the resistance above 5.0 ohms for either circuit?All
Ye s!Repair the CAN circuit(s) for an open
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 8
8 Turn the ignition off.
Disconnect the CAB harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused Optional Equipment
Relay Output circuit at the CAB harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s!Go To 9
No!Repair the Fused Optional Equipment Relay Output circuit for an
open.
Perform ABS VERIFICATION TEST - VER 1.
26
BRAKES (CAB)
CAN COMMUNICATION ERROR ÐContinued

TEST ACTION APPLICABILITY
9 Turn the ignition off.
Disconnect the CAB harness connector.
Using a 12-volt test light connected to ground, check both Fused B(+) circuits at the
CAB harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s!Go To 10
No!Repair the Fused B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
10 Turn the ignition off.
Disconnect the CAB harness connector.
Using a 12-volt test light connected to 12-volts, check the CAB harness connector
Ground circuits.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s!Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No!Repair the Ground circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
11 Turn the ignition off.
Visually inspect the related wiring harness.
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out, or corroded terminals.
Were any problems found?All
Ye s!Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No!Test Complete.
27
BRAKES (CAB)
CAN COMMUNICATION ERROR ÐContinued

Symptom:
INCORRECT TONE WHEEL
When Monitored and Set Condition:
INCORRECT TONE WHEEL
When Monitored: Ignition On - Continuously
Set Condition: When continuous ABS control is active for one minute on one or more
wheels OR interference on one or more wheels OR deviation of two wheel speeds at either
side of vehicle by 6 km/h (4 mph) or at the front axle by 10 km/h (7 mph). If at least one
wheel is 5 km/h (3 mph) or less, a wheel speed deviation of adjoining wheels of 12 km/h (8
mph) is allowed.
POSSIBLE CAUSES
INTERMITTENT INCORRECT TONE WHEEL DTC
INCORRECT TIRES ON VEHICLE
TIRE CIRCUMFERENCES NOT MATCHING
WHEEL SPEED SENSOR CIRCUIT SHORT TO VOLTAGE
INCORRECT TONE WHEEL
WHEEL SPEED SENSOR CIRCUIT SHORT TO GROUND
DAMAGED WHEEL BEARING
WHEEL SPEED SENSOR CIRCUIT OPEN
DAMAGED BRAKE LININGS/COMPONENTS
WHEEL SPEED SENSOR CIRCUITS SHORTED TOGETHER
WHEEL SPEED SENSOR
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, read DTCs.
With the DRBIIIt, erase DTCs.
Turn the ignition off.
Turn the ignition on.
Road test the vehicle.
During the road test, drive the vehicle above 100 km/h (62 mph) for at least 3 minutes
and perform several stops and Antilock stops.
Stop the vehicle.
With the DRBIIIt, read DTCs.
Does the DRBIIItdisplay INCORRECT TONE WHEEL?All
Ye s!Go To 2
No!Go To 13
32
BRAKES (CAB)

TEST ACTION APPLICABILITY
2 Turn the ignition off.
Inspect the tire sizes on the vehicle.
Is a smaller than production tire or spare tire being used?All
Ye s!Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 3
3 Turn the ignition off.
Measure all the tire circumferences.
Do all the tire circumferences match?All
Ye s!Go To 4
No!Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
4 Turn the ignition off.
Inspect the tone wheel(s) for damage, missing teeth, cracks, or looseness.
NOTE: Refer to the service manual information, if necessary, for procedures
or specifications.
Are one or more tone wheel(s) loose or damaged?All
Ye s!Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 5
5 Turn the ignition off.
Inspect the wheel bearings for excessive runout or clearance.
NOTE: Refer to the service information, if necessary, for procedures or
specifications.
Is the wheel bearing clearance within specifications?All
Ye s!Go To 6
No!Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
6 Turn the ignition off.
Visually inspect the brakes for locking up due to lining contamination or overheating.
Inspect all brake components for any condition that would cause a variation in wheel
speed.
Is any component damaged?All
Ye s!Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 7
7 Turn the ignition on.
With the DRBIIItin Sensors, monitor ALL the Wheel Speed Sensor signals while an
assistant drives the vehicle.
Slowly accelerate from a stop to 65 km/h (40 mph).
NOTE: Wheel Speed should not vary by more than 10% from wheel to wheel
when driving in a straight line.
Do any of the Wheel Speed Sensor signals vary by greater than 10% while driving in
a straight line?All
Ye s!Go To 8
No!Go To 13
33
BRAKES (CAB)
INCORRECT TONE WHEEL ÐContinued

TEST ACTION APPLICABILITY
8 Turn the ignition off.
Disconnect the CAB harness connector.
Turn the ignition on.
Measure the voltage of both affected Wheel Speed Sensor circuits in the CAB harness
connector.
Is there any voltage present?All
Ye s!Repair the affected Wheel Speed Sensor circuit for a short to
voltage.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 9
9 Turn the ignition off.
Disconnect the CAB harness connector.
Measure the resistance between ground and both affected Wheel Speed Sensor
circuits in the CAB harness connector.
Is the resistance below 5.0 ohms?All
Ye s!Repair the affected Wheel Speed Sensor circuit for a short to
ground.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 10
10 Turn the ignition off.
Disconnect the CAB harness connector.
Measure the resistance between the affected Wheel Speed Sensor circuits in the CAB
harness connector.
Is the resistance over 1,800 ohms?All
Ye s!Repair the affected Wheel Speed Sensor circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 11
11 Turn the ignition off.
Disconnect the CAB harness connector.
Measure the resistance between the affected Wheel Speed Sensor circuits in the CAB
harness connector.
Is the resistance under 1,100 ohms?All
Ye s!Repair the affected Wheel Speed Sensor circuits for a short to
each other.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 12
12 Turn the ignition off.
Disconnect the CAB harness connector.
Measure the resistance between the affected Wheel Speed Sensor circuits in the CAB
harness connector.
Is the resistance between 1,100 and 1,800 ohms?All
Ye s!Go To 13
No!Replace the Wheel Speed Sensor in accordance with the Service
Information.
Perform ABS VERIFICATION TEST - VER 1.
34
BRAKES (CAB)
INCORRECT TONE WHEEL ÐContinued