Symptom Troubleshooting (ABS): Other Mazda MX-5 NC рестайлинг

FOREWORD [ABS]

1. Before performing the steps in Symptom Troubleshooting, perform the On-board Diagnostic Inspection. To check the DTC, follow the DTC Inspection steps. (See «ON-BOARD DIAGNOSIS [ABS]»(ref-430292-S29364779782011101700000) )

PRECAUTION [ABS]

1. Any one or a combination of the ABS warning and brake system warning lights illuminate even when the system is normal. ABS WARNING AND BRAKE SYSTEM WARNING LIGHTS CONDITION REFERENCE Warning lights that may illuminate and/or flash Condition under which the light may illuminate Conditions under which the light will go out ABS, EBD control Any or all the following lights illuminate: ABS warning light Brake system warning light ( (1) ) Under any of the following conditions: When the front wheels are jacked up, stuck, or placed on a chassis roller, and only the front wheel ABS wheel speed sensors are spun for 20 seconds or more. After turning ignition switch off, vehicle is driven at speed greater than 10 km/h {6.2 mph} and normal operation is confirmed. ABS: Disables control. EBD: Disable control, in cases where the light may illuminate, only when ABS HU/CM detects that wheel speed sensors determine that two or more rear wheels are malfunctioning. Enables control, if wheel speed sensors determine that three or more wheels are functioning correctly. Parking brake is not fully released while driving. Brake drag. Sudden acceleration/deceleration. Left/right or front/rear tires are different. (Size, radius, tire pressure, or wear is other than that listed on tire label.) All the following lights illuminate: ABS warning light Brake system warning light Battery voltage at ABS HU/CM ignition terminal J drops below approx. 9 to 10 V. ( (2) ) Battery voltage rises above approx. 10 V. (Only brake system warning light goes out.) ABS: Enables control. EBD: Enables control. (1) The light will illuminate only when ABS HU/CM detects that a rear wheel-speed sensor is malfunctioning. (2) If battery voltage drops below 9 V while vehicle speed is greater than 6 km/h {3.7 mph} , the ABS HU/CM stores DTC B1318.
2. Precautions during servicing of ABS The ABS is composed of electrical and mechanical parts, it is necessary to categorize malfunctions as being either electrical or hydraulic when performing troubleshooting. Malfunctions in electrical system The ABS HU/CM has an on-board diagnostic function. With this function, any one or a combination of the ABS warning light and brake system warning light will illuminate when there is a problem in the electrical system. Also, past and present malfunctions are stored in the ABS HU/CM. This function can find malfunctions that do not occur during periodic inspections. Connect the M-MDS to the DLC-2. Stored malfunctions will be displayed in the order of occurrence. To find out the causes of ABS malfunctions, use these on-board diagnostic results. If a malfunction occurred in the past but is now normal, the cause is likely a temporary poor connection of the wiring harness. The ABS HU/CM usually operates normally. Be careful when searching for the cause of malfunction. After repair, it is necessary to clear the DTC from the ABS HU/CM memory. Also, if the ABS related parts have been replaced, verify that no DTC is displayed after repairs. After repairing the ABS wheel-speed sensor or ABS sensor rotor, or after replacing the ABS HU/CM, the ABS warning light may not go out (*) even when the ignition switch is turned to the ON position. In this case, drive the vehicle at a speed of 10 km/h {6.2 mph} or more , make sure that ABS warning light goes out, and then clear the DTC. * The brake system warning light also illuminates when there is any rear wheel deformation. When repairing, if the ABS related connectors are disconnected and the ignition switch is turned to the ON position, the ABS HU/CM will mistakenly detect a fault and record it as a malfunction. To protect the ABS HU/CM, make sure the ignition is off before connecting or disconnecting the ABS HU/CM connector. Malfunctions in hydraulic system Symptoms in a hydraulic system malfunction are similar to those in a conventional brake malfunction. However, it is necessary to determine if the malfunction is in an ABS component or the conventional brake system. The ABS hydraulic unit contains delicate mechanical parts. If foreign material gets into the component, the ABS may fail to operate. Also, it will likely become extremely difficult to find the location of the malfunction in the event that the brakes operate but the ABS does not. Make sure foreign material does not enter when servicing the ABS (e.g. brake fluid replacement, pipe removal).

Malfunction data monitor method

1. Perform the malfunction reappearance test according to malfunction reappearance mode and malfunction data monitor. The malfunction cause is found in the malfunction data.

Scheme 59

1. Inspect the connection condition of each female terminal.
2. Insert the male terminal, and fit the female terminal side to female terminal. Inspect if the malfunction is in the female terminal.

Scheme 60

1. Verify the symptoms, and perform troubleshooting according to the appropriate number. SYMPTOM CHART No. Symptom 1 Neither ABS warning light nor brake system warning light illuminate when ignition switch turned to ON position 2 ABS warning light does not illuminate when ignition switch turned to ON position 3 Brake system warning light does not illuminate when the ignition switch is turned to the ON position 4 Both ABS warning light and brake system warning light stay on 4 seconds or more when the ignition switch is turned to the ON position 5 ABS warning light stays on 4 s or more when the ignition switch turned to ON position 6 Brake system warning light stays on 4 seconds or more when ignition switch turned to ON position (Parking brake is released)

NO. 1 NEITHER ABS WARNING LIGHT NOR BRAKE SYSTEM WARNING LIGHT ILLUMINATE WHEN IGNITION SWITCH TURNED TO ON POSITION [ABS]

POSSIBLE CAUSE REFERENCE

DIAGNOSTIC PROCEDURE STEP INSPECTION ACTION 1 VERIFY WHETHER MALFUNCTION IS IN COMMON POWER SUPPLY OF WARNING LIGHTS AND INDICATOR LIGHTS, OR IN OTHER WARNING LIGHTS AND INDICATOR LIGHTS Verify other warning and indicator lights illuminate when the ignition switch is turned to the ON position? Is there any warning and indicator light? Yes Go to Step 4. No Go to the next step. 2 INSPECT INSTRUMENT CLUSTER POWER SUPPLY FUSE Inspect the instrument cluster power supply fuse. Is there any malfunction? Yes Inspect the blown fuse related wiring harness for short to ground. Repair or replace the wiring harness for a possible short to ground, if necessary. Install the appropriate amperage fuse. No Go to the next step. 3 VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (INSPECT FOR CONTINUITY BETWEEN INSTRUMENT CLUSTER POWER SUPPLY AND INSTRUMENT CLUSTER) OR INSTRUMENT CLUSTER Turn the ignition switch to the ON position (engine off). Measure the voltage at instrument cluster terminal 1G (wiring harness-side). Is the voltage approx. 12 V? Yes Replace the instrument cluster (open circuit in instrument cluster internal circuit). (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION ) No Inspect the wiring harness between the instrument cluster and body ground for open circuit. Repair or replace the wiring harness for a possible open circuit, if necessary. 4 CONFIRM DTC U1900 Retrieve the DTC from the PCM, ABS and instrument cluster. See ON-BOARD DIAGNOSTIC TEST [LF] . (See ON-BOARD DIAGNOSIS [ABS] ) (See DTC INSPECTION [INSTRUMENT CLUSTER] ) Is the DTC U1900 present? Yes Go to the next step. No Inspect the instrument cluster. (See INSTRUMENT CLUSTER INSPECTION ) If the instrument cluster has a malfunction: Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION ) If the instrument cluster is normal: Go to Step 6. 5 CONFIRM DTCS U0121, U0100 AND U0214 Retrieve the DTC from the instrument cluster. (See DTC INSPECTION [INSTRUMENT CLUSTER] ) Is the DTC U0121, U0100 or U0214 present? Yes Replace the instrument cluster (open circuit in instrument cluster). (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION ) No Inspect the network communication for related system malfunction. Repair or replace the malfunctioning part according to the inspection results, if necessary. 6 CONFIRM DTC B2477 Retrieve the DTC from the instrument cluster. (See DTC INSPECTION [INSTRUMENT CLUSTER] ) Is the DTC B2477 present? Yes Perform the instrument cluster configuration. (See INSTRUMENT CLUSTER CONFIGURATION ) No Replace the ABS HU/CM. (See ABS HU/CM REMOVAL/INSTALLATION )

Scheme 61

1. When performing an asterisked (*) troubleshooting inspection, slightly shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, verify that the connectors, terminals and wiring harness are connected correctly and undamaged.

NO. 2 ABS WARNING LIGHT DOES NOT ILLUMINATE WHEN IGNITION SWITCH TURNED TO ON POSITION [ABS]

POSSIBLE CAUSE REFERENCE

NO. 3 BRAKE SYSTEM WARNING LIGHT DOES NOT ILLUMINATE WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION [ABS]

POSSIBLE CAUSE REFERENCE

NO. 4 BOTH ABS WARNING LIGHT AND BRAKE SYSTEM WARNING LIGHT STAY ON 4 S OR MORE WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION [ABS]

POSSIBLE CAUSE REFERENCE

NO. 5 ABS WARNING LIGHT STAYS ON 4 seconds or more WHEN IGNITION SWITCH TURNED TO ON POSITION [ABS]

POSSIBLE CAUSE REFERENCE

NO. 6 BRAKE SYSTEM WARNING LIGHT STAYS ON 4 S OR MORE WHEN IGNITION SWITCH TURNED TO ON POSITION [ABS]

POSSIBLE CAUSE REFERENCE