DT5.4 Verify Proper RABS Operation In 4X2

WARNING: Perform this test on an axle hoist only.

NOTE: Because vehicle is not on the ground, wheels will spin for a significant time. This is not indicative of vehicle braking performance.

^ Place vehicle on the hoist and raise high enough to clear all wheels off the ground.

^ Verify vehicle is in 4x2 mode.

^ Place vehicle transmission (7003) in Drive Low (automatic) or First gear (manual).
^ Accelerate vehicle drive wheels to 10 mph.

^ Press hard on the brake pedal until wheels stop.

^ Do the rear wheels first lock up and then spin?

YES -- Leave key ON. Go to DT5.5. DT5.5 Obtain Diagnostic Trouble Code

NO -- Replace anti-lock brake control module. Go to Drive Test Code 16 to verify concern is resolved. Description