Symptom Troubleshooting (ABS): Other Mazda RX-8 I 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] .)

PRECAUTION [ABS]

1. Any one or a combination of the ABS warning and BRAKE system warning lights illuminate even when the system is normal. PRECAUTION CHART 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 s 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 Z 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.

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

PROBLEM SYMPTOMS

NO. 1 NEITHER ABS WARNING LIGHT NOR BRAKE SYSTEM WARNING LIGHT ILLUMINATE WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION 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 Do other warning and indicator lights illuminate when the ignition switch is turned to the ON position? Yes Go to step 4. No Go to the next step. 2 INSPECT INSTRUMENT CLUSTER POWER SUPPLY FUSE Is the instrument cluster ignition power supply fuse normal? Yes Go to the next step. No Inspect for a short to ground on circuit of blown fuse. Repair or replace if necessary. Install appropriate amperage fuse. *3 VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (INSPECT FOR CONTINUITY BETWEEN INSTRUMENT CLUSTER POWER SUPPLY AND INSTRUMENT CLUSTER) OR INSTRUMENT CLUSTER Turn ignition switch to ON position. Measure voltage at instrument cluster connector (12-pin) terminal 1G. Is the voltage approx. 12 V? Yes Replace the instrument cluster (open circuit in instrument cluster.) (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) No Inspect for open circuit between instrument cluster and ground. Repair or replace if necessary. 4 CONFIRM DTC U1900 USING M-MDS Retrieve DTCs from the PCM, ABS and instrument cluster. Is DTC U1900 retrieved? Yes Go to the next step. No Inspect the instrument cluster. If normal, go to Step 6. 5 CONFIRM THE FOLLOWING PIDs USING M-MDS: ABS_MSG PCM_MSG EPS_MSG TPM_MSG Is "not present" message displayed on M-MDS? Yes Replace the instrument cluster (open circuit in instrument cluster.) (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) No Inspect network communication for related system malfunction. Repair or replace if necessary. 6 CONFIRM DTC B2477 FOR INSTRUMENT CLUSTER USING M-MDS Is DTC B2477 retrieved? Yes Perform instrument cluster configuration. (See INSTRUMENT CLUSTER CONFIGURATION .) No Replace the ABS HU/CM. (See ABS HU/CM REMOVAL/INSTALLATION .) 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

Scheme 57

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

PROBLEM SYMPTOMS

NO. 2 ABS WARNING LIGHT DOES NOT ILLUMINATE WHEN IGNITION SWITCH TURNED TO ON POSITION DIAGNOSTIC PROCEDURE STEP INSPECTION ACTION 1 CONFIRM DTC U1900 USING M-MDS Retrieve DTCs from the PCM, ABS and instrument cluster. Is DTC U1900 retrieved? Yes Go to the next step. No Inspect the instrument cluster. If normal, go to the next step. 2 CONFIRM THE FOLLOWING PIDs USING M-MDS: ABS_MSG PCM_MSG EPS_MSG TPM_MSG Is "not present" message displayed on M-MDS? Yes Replace the instrument cluster (open circuit in instrument cluster.) (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) No Inspect network communication for related system malfunction. Repair or replace if necessary

Scheme 58

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

PROBLEM SYMPTOMS

NO. 3 BRAKE SYSTEM WARNING LIGHT DOES NOT ILLUMINATE WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION DIAGNOSTIC PROCEDURE STEP INSPECTION ACTION 1 CONFIRM DTC U1900 USING M-MDS Retrieve DTCs from the PCM, ABS and instrument cluster. Is DTC U1900 retrieved? Yes Go to the next step. No Inspect the instrument cluster. If normal, go to the next step. 2 CONFIRM THE FOLLOWING PIDs USING M-MDS: ABS_MSG PCM_MSG EPS_MSG TPM_MSG Is "not present" message displayed on M-MDS? Yes Replace the instrument cluster (open circuit in instrument cluster.) (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) No Inspect network communication for related system malfunction. Repair or replace if necessary

Scheme 59

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]

PROBLEM SYMPTOMS

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 DIAGNOSTIC PROCEDURE STEP INSPECTION ACTION 1 INSPECT ABS HU/CM POWER SUPPLY FUSE Is the ABS HU/CM ignition power supply fuse normal? Yes Go to the next step. No Inspect for a short to ground on circuit of blown fuse. Repair or replace if necessary. Install appropriate amperage fuse. 2 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY AND SHORTS Perform DTC inspection. Is error message displayed regarding communication between ABS HU/CM and M-MDS? Yes If a communication error message is displayed even after inspecting according to procedure displayed on M-MDS, go to step 10. No Go to the next step. 3 INSPECT FOR DTCS IN ABS HU/CM Have DTCs been stored in memory? Yes Perform the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [ABS] .) No Go to the next step. 4 INSPECT PID/DATA IN ABS HU/CM Inspect the following items using M-MDS data logger function. ABS_LAMP (ABS warning light) BRAKE_LMP (BRAKE system warning light) ABS_VOLT (power supply voltage) Is ABS_LAMP and BRAKE_LMP ON 4 s or more after the ignition switch is turned to the ON position? Yes Go to the next step. No Inspect the instrument cluster. 5 INSPECT ABS HU/CM IGNITION POWER SUPPLY SYSTEM (TERMINAL Z) Inspect the voltage for data logger ABS_VOLT item. Specification: approx. 10V Is the voltage within specification? Yes Replace the ABS HU/CM (open or short in ground circuit in ABS HU/CM.) (See ABS HU/CM REMOVAL/INSTALLATION .) No Go to the next step. 6 INSPECT BATTERY Is the battery voltage normal? Yes Go to the next step. No Inspect the battery and charging system. (See BATTERY INSPECTION [13B-MSP] .) (See GENERATOR INSPECTION [13B-MSP] .) 7 INSPECT CHARGING SYSTEM Is the battery voltage normal with electrical load (A/C, headlight, etc.) on and engine idling? Yes Go to the next step. No Inspect the charging system (drive belt tension, generator, etc.) (See GENERATOR INSPECTION [13B-MSP] .) *8 INSPECT WIRING HARNESS BETWEEN ABS HU/CM POWER SUPPLY AND ABS HU/CM FOR CONTINUITY Disconnect the ABS HU/CM connector. Is the voltage approx. 12 V at connector terminal Z? Yes Go to the next step. No Inspect the ABS HU/CM connector for secure connection. *9 INSPECT WIRING HARNESS BETWEEN ABS HU/CM GROUND FOR CONTINUITY Turn the ignition switch to LOCK position. Is there continuity between connector terminal AC and ground? Yes If a malfunction error message is displayed on the M-MDS in Step 1 inspection, go to the next step. If a malfunction error message is not displayed on the M-MDS in Step 1 inspection, troubleshooting is completed. No Repair the wiring harness between ABS HU/CM and ground. *10 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY Is there continuity between connector terminal X and DLC-2? Yes Go to the next step. No Repair the wiring harness between ABS HU/CM and DLC-2. *11 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO BATTERY Is the voltage approx. 12 V at connector terminal X? Yes Repair the wiring harness between ABS HU/CM and DLC-2. No Go to the next step. *12 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND Is there continuity between connector terminal X and DLC-2? Yes Repair the wiring harness between ABS HU/CM and DLC-2. No Replace the ABS HU/CM (communication circuit malfunction in ABS HU/CM.) (See ABS HU/CM REMOVAL/INSTALLATION .) 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

Scheme 60

NO. 5 ABS WARNING LIGHT STAYS ON 4 S OR MORE WHEN IGNITION SWITCH TURNED TO ON POSITION [ABS]

PROBLEM SYMPTOMS

NO. 5 ABS WARNING LIGHT STAYS ON 4 S OR MORE WHEN IGNITION SWITCH TURNED TO ON POSITION DIAGNOSTIC PROCEDURE STEP INSPECTION ACTION 1 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY AND SHORTS Perform DTC inspection. Is error message displayed regarding communication between ABS HU/CM and M-MDS? Yes If the communication error message is displayed even after inspecting according to procedures displayed in the M-MDS, go to Step 4. No Go to the next step. 2 INSPECT FOR DTCs IN ABS HU/CM Have DTCs been stored in memory? Yes Perform the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [ABS] .) No Go to the next step. 3 INSPECT PID/DATA IN ABS HU/CM Inspect the following items using M-MDS data logger function. ABS_LAMP (ABS warning light) Is ABS_LAMP ON 4 s or more after turning the ignition switch to the ON position? Yes Replace the ABS HU/CM (open circuit or short to ground in ABS HU/CM.) (See ABS HU/CM REMOVAL/INSTALLATION .) No Inspect the instrument cluster. *4 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY Disconnect the ABS HU/CM connector. Is there continuity between connector terminal X and DLC-2? Yes Go to the next step. No Repair the wiring harness between the ABS HU/CM and DLC-2. *5 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO B+ Is the voltage approx. 12V at connector terminal X? Yes Repair the wiring harness between the ABS HU/CM and DLC-2. No Go to the next step. *6 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND Is there continuity between connector terminal X and ground? Yes Repair the wiring harness between the ABS HU/CM and DLC-2. No Replace the ABS HU/CM (communication circuit malfunction in ABS HU/CM.) (See ABS HU/CM REMOVAL/INSTALLATION .) 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

Scheme 61

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

PROBLEM SYMPTOMS

NO. 6 BRAKE SYSTEM WARNING LIGHT STAYS ON 4 S OR MORE WHEN IGNITION SWITCH TURNED TO ON POSITION DIAGNOSTIC PROCEDURE STEP INSPECTION ACTION 1 INSPECT BRAKE FLUID LEVEL Is brake fluid level normal? Yes Go to the next step. No Add brake fluid. *2 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY AND SHORTS Inspect the following items using the M-MDS datalogger function. BRAKE_LMP (BRAKE system warning light) Is error message displayed regarding communication between ABS HU/CM and M-MDS? Yes If a communication error message is displayed even after inspecting according to procedures displayed on M-MDS. Go to next Step 6. No Go to the next step. 3 INSPECT FOR DTCs IN ABS HU/CM Have DTCs been stored in memory? Yes Perform the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [ABS] .) No Go to the next step. 4 INSPECT PID/DATA IN ABS HU/CM Inspect (BRAKE system warning light) using the M-MDS datalogger function. Is BRAKE_LMP on 4 s or more after the ignition switch is turned to the ON position? Yes Replace the ABS HU/CM. (See ABS HU/CM REMOVAL/INSTALLATION .) No Go to the next step. 5 VERIFY WHETHER MALFUNCTION IS IN PARKING BRAKE SWITCH OR BRAKE FLUID LEVEL SENSOR, OR IN SOME OTHER PART Disconnect in the following order: Parking brake switch connector Brake fluid level sensor connector Does BRAKE system warning light go out with ignition switch to ON position? Yes Replace the parking brake switch and/or brake fluid level sensor (Short with some internal part.) (See MASTER CYLINDER REMOVAL/INSTALLATION .) (See PARKING BRAKE LEVER REMOVAL/INSTALLATION .) No Perform the following inspections. Repair if necessary. Short to ground in the wiring harness between the instrument cluster (BRAKE system warning light) and parking brake switch. Short to ground in the wiring harness between the instrument cluster (BRAKE system warning light) and brake fluid level sensor. Inspect the instrument cluster. *6 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY Disconnect the ABS HU/CM connector. Is there continuity between connector terminal X and DLC-2? Yes Go to the next step. No Repair the wiring harness between the ABS HU/CM and DLC-2. *7 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO B+ Is the voltage approx. 12 V at connector terminal X? Yes Repair the wiring harness between the ABS HU/CM and DLC-2. No Go to the next step. *8 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND Is there continuity between connector terminal X and ground? Yes Repair the wiring harness between the ABS HU/CM and DLC-2. No Replace the ABS HU/CM (communication circuit malfunction in ABS HU/CM.) (See ABS HU/CM REMOVAL/INSTALLATION .) 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

Scheme 62