Chrysler Town, Dodge Caravan. Manual - part 981

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Remove the CAB harness strain relief to access wires.
Reconnect the CAB harness connector.
Turn the ignition on.
Measure the voltage between affected Wheel Speed Sensor 12 Volt Supply circuit and
ground.
Is the voltage above 10 volts?

All

Yes

→ Go To 10

→ Replace the Controller Antilock Brake in accordance with the

Service Information.
Perform ABS VERIFICATION TEST - VER 1.

All

Yes

→ Go To 11

→ Replace the Controller Antilock Brake in accordance with the

Service Information.
Perform ABS VERIFICATION TEST - VER 1.

Turn the ignition off.
Reconnect ALL affected Wheel Speed Sensor circuit connectors.
Disconnect the affected Wheel Speed Sensor connector.
Turn the ignition on.
Measure the voltage of the affected Wheel Speed Sensor 12 Volt Supply circuit in the
affected Wheel Speed Sensor connector while reconnecting the sensor connector.
Did the affected Wheel Speed Sensor 12 Volt Supply circuit drop voltage to 0 DC
volts?

All

Yes

→ Replace the affected Wheel Speed Sensor in accordance with the

Service Information.
Perform ABS VERIFICATION TEST - VER 1.

→ Go To 12

Turn the ignition off.
Reconnect ALL affected Wheel Speed Sensor circuit connectors.
Turn the ignition on.
Measure the DC voltage of the Wheel Speed Sensor Signal circuit in the affected
Wheel Speed Sensor connector.
Slowly rotate the wheel.
Does the DC voltage toggle between 1.6 volts to .8 volts?

All

Yes

→ Go To 13

→ Replace the affected Wheel Speed Sensor in accordance with the

Service Information.
Perform ABS VERIFICATION TEST - VER 1.

BRAKES (CAB)

LEFT FRONT SENSOR CIRCUIT FAILURE —

Continued

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?

All

Yes

→ Repair as necessary.

Perform ABS VERIFICATION TEST - VER 1.

→ Test Complete.

BRAKES (CAB)

LEFT FRONT SENSOR CIRCUIT FAILURE —

Continued

Symptom List:

LEFT FRONT WHEEL SPEED SIGNAL FAILURE
LEFT REAR WHEEL SPEED SIGNAL FAILURE
RIGHT FRONT WHEEL SPEED SIGNAL FAILURE
RIGHT REAR WHEEL SPEED SIGNAL FAILURE

Test Note:

All symptoms listed above are diagnosed using the same tests.

The title for the tests will be LEFT FRONT WHEEL SPEED
SIGNAL FAILURE.

When Monitored and Set Condition:

LEFT FRONT WHEEL SPEED SIGNAL FAILURE

When Monitored:

Wheel speed are checked and verified at drive off and continuously

thereafter.

Set Condition:

If, during an ABS stop, the CAB commands any valve solenoid on for an

extended length of time, and does not see a corresponding wheel speed change, the
Diagnostic Trouble Code (DTC) is set. The DTC can also set if the signal is missing or
erratic.

LEFT REAR WHEEL SPEED SIGNAL FAILURE

When Monitored:

Wheel speed are checked and verified at drive off and continuously

thereafter.

Set Condition:

If, during an ABS stop, the CAB commands any valve solenoid on for an

extended length of time, and does not see a corresponding wheel speed change, the
Diagnostic Trouble Code (DTC) is set. The DTC can also set if the signal is missing or
erratic.

RIGHT FRONT WHEEL SPEED SIGNAL FAILURE

When Monitored:

Wheel speed are checked and verified at drive off and continuously

thereafter.

Set Condition:

If, during an ABS stop, the CAB commands any valve solenoid on for an

extended length of time, and does not see a corresponding wheel speed change, the
Diagnostic Trouble Code (DTC) is set. The DTC can also set if the signal is missing or
erratic.

RIGHT REAR WHEEL SPEED SIGNAL FAILURE

When Monitored:

Wheel speed are checked and verified at drive off and continuously

thereafter.

Set Condition:

If, during an ABS stop, the CAB commands any valve solenoid on for an

extended length of time, and does not see a corresponding wheel speed change, the
Diagnostic Trouble Code (DTC) is set. The DTC can also set if the signal is missing or
erratic.

BRAKES (CAB)

POSSIBLE CAUSES

WHEEL SPEED SIGNAL FAILURE DTC PRESENT

AFFECTED WHEEL SPEED SENSOR SIGNAL INOPERATIVE

AFFECTED WHEEL SPEED SENSOR CONNECTOR DAMAGED

AFFECTED WHEEL SPEED SENSOR TONE WHEEL DAMAGED

AFFECTED WHEEL SPEED SENSOR AIR GAP FAULT

WHEEL BEARING FAULT

BRAKE LINING FAULT

AFFECTED WHEEL SPEED SENSOR CIRCUIT ELECTRICAL FAULT

TEST

ACTION

APPLICABILITY

Turn the ignition on.
With the DRBIII

t, read DTCs.

With the DRBIII

t, read Freeze Frame information.

NOTE: The CAB must sense ALL 4 wheels at 25 km/h (15 mph) before it will
extinguish the ABS indicators.
Does the DRBIII

t display WHEEL SPEED/SIGNAL FAILURE and SENSOR CIR-

CUIT FAILURE?

All

Yes

→ Refer to the affected Wheel Speed SENSOR CIRCUIT FAILURE

for the related symptom(s).
Perform ABS VERIFICATION TEST - VER 1.

→ Go To 2

Turn the ignition on.
With the DRBIII

t in Sensors, monitor ALL the Wheel Speed Sensor Signals while an

assistant drives the vehicle.
Slowly accelerate as straight as possible from a stop to 24 km/h (15 mph).
Is the affected Wheel Speed Signal showing 0 km/h (0 mph)?

All

Yes

→ Go To 3

→ The condition is not present at this time. Monitor DRBIIIt

parameters while wiggling the related wiring harness. Refer to
any Technical Service Bulletins(TSB) that may apply. Visually
inspect the related wiring harness and connector terminals.
Perform ABS VERIFICATION TEST - VER 1.

Turn the ignition off.
Inspect the CAB connector, affected Wheel Speed Sensor, and affected Wheel Speed
Sensor connector.
Is the Wheel Speed Sensor or any connector damaged?

All

Yes

→ Repair as necessary.

Perform ABS VERIFICATION TEST - VER 1.

→ Go To 4

BRAKES (CAB)

LEFT FRONT WHEEL SPEED SIGNAL FAILURE —

Continued

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