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3. CHECK WHEEL SPEED SENSOR SIGNALS Turn the ignition on. With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehi- NOTE: If graph shows periodic dropouts pay close attention to the tone wheel. Is the Left Rear WSS speed showing 0 km/h (0 m.p.h.) or not matching other wheel speeds? Yes >> Go To 4 No >> Refer to the INTERMITTENT CONDITION diagnostic procedure. Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE). 4. CHECK FOR IMPROPER LEFT REAR TIRE PRESSURE/MISMATCHED TIRES Turn the ignition off. Check and adjust the Left Rear Tire pressure. Check and adjust all other tire pressures. Inspect for mismatched tires on vehicle. Is the Left Rear Tire improperly inflated or mismatched tires on vehicle? Yes >> Repair as necessary Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE). No >> Go To 5 5. CHECK LEFT REAR WSS LOOSENESS, INSPECT B4, B5 CIRCUITS/TERMINALS FOR DAMAGE NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals Inspect the Left Rear WSS for looseness, excessive corrosion and not properly fastened. Inspect the (B3) Left Rear WSS Signal and (B4) Left Rear WSS Supply circuits between the Left Rear WSS and Is the Left Rear WSS loose or any of the wiring/connectors/terminals damaged? Yes >> Repair as necessary Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE). No >> Go To 6 6. CHECK LEFT REAR TONE WHEEL FOR DAMAGE Inspect the Left Rear Tone Wheel for damage, missing teeth, cracks, or looseness. NOTE: The Tone Wheel teeth should be perfectly square, not bent, or nicked. Is the Left Rear Tone Wheel damaged? Yes >> Repair as necessary Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE). No >> Go To 7 PM BRAKES - ABS ELECTRICAL DIAGNOSTICS 5 - 169 |