NO.8 ABS OPERATES FREQUENTLY [ABS]

id0403a5951100

8

ABS operates frequently

POSSIBLE CAUSE

• There is a difference in size or air pressure between front and rear tires.

• Incorrect ABS wheel-speed signal is inputted to ABS HU/CM.

8	ABS operates frequently
POSSIBLE CAUSE	• There is a difference in size or air pressure between front and rear tires. • Incorrect ABS wheel-speed signal is inputted to ABS HU/CM.

Diagnostic procedure

STEP	INSPECTION		ACTION
1	CONFIRM ABS HU/CM AND PCM DTC • Retrieve the ABS HU/CM DTC using the M-MDS. (See ON-BOARD DIAGNOSIS [ABS].) • Retrieve the PCM DTC using the M-MDS, if the traction control function has problem. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.8, MZR 2.0, MZR 2.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [ABS]s.) (See DTC TABLE [MZR 1.8, MZR 2.0, MZR 2.5]s.)
1		No	Go to the next step.
2	INSPECT TIRE SIZE AND AIR PRESSURE • Inspect tire size and air pressure. • Tire size and air pressure as specified?	Yes	Go to the next step.
2		No	Replace with specified tires and adjust tire air pressure.
^*3	INSPECT ABS WHEEL-SPEED SENSOR OUTPUT PULSE • Perform the Voltage Pattern Inspection for each ABS wheel-speed sensor. (See FRONT ABS WHEEL-SPEED SENSOR INSPECTION.) (See REAR ABS WHEEL-SPEED SENSOR INSPECTION.) • Is the output voltage pattern normal?	Yes	Found malfunctioning part according to the “INTERMITTENT CONCERN TROUBLESHOOTING”. (See PRECAUTION [ABS].)
^*3		No	ABS wheel-speed sensor installation inspection: • Inspect the ABS wheel-speed sensor for looseness and confirm it is securely adhered. ABS sensor rotor installation inspection: • Inspect the ABS sensor rotor for poor installation.

• When performing an asterisked (^*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harness are connected correctly and undamaged.