Excessive Dump Time

Test 1 And 2:

Test 3 And 4:

Symptom:
EXCESSIVE DUMP TIME

When Monitored and Set Condition:
EXCESSIVE DUMP TIME

When Monitored: Brake pedal depressed (to enable antilock activity). Wheel speed below 6 km/h (4 mph). Four wheel drive sense signal input indicates vehicle is not in four wheel drive. Wheel speed history ruling out any unusual events during the proceeding 15 seconds.

Set Condition: The need for more that 24 dump pulses in response to the wheels that have gone to lock and is not recovering.

POSSIBLE CAUSES
MECHANICAL PROBLEMS WITH BRAKE SYSTEM
WHEEL SPEED SENSOR HARNESS DEFECTIVE
TONE WHEEL DEFECTIVE
HYDRAULIC CONTROL UNIT DEFECTIVE