Dynamic Stability Control: Diagnosis Mazda RX-8 I рестайлинг

DSC Control Inspection

1. Perform "Preparation".
2. Connect the M-MDS to the DLC-2.
3. Set up an active command mode inspection according to the combination of commands below. CAUTION: To protect the DSC HU/CM, the solenoid valve and the pump motor used during active command mode stay on for only 10 sec. or less each time they are switched on. COMMAND NAME Command name Inspected wheels Under steer control inhibited Oversteer control inhibited LF RF LR RR V_TRC_L ON OFF ON V_TRC_R OFF ON OFF V_STB_L OFF V_STB_R LF_INLET OFF OFF OFF ON LF_OUTLET OFF LR_INLET ON LR_OUTLET OFF RF_INLET ON RF_OUTLET OFF RR_INLET ON RR_OUTLET OFF PMP_MOTOR ON
4. Send the command while rotating the wheel being inspected by hand in a forward direction.
5. Confirm that the wheel does not rotate easily while a DSC HU/CM operation click sound is heard. Performing the inspection above determines the following: The DSC HU/CM brake lines are normal. The DSC HU/CM hydraulic system is not significantly abnormal (including DSC HU/CM.) The DSC HU/CM internal electrical parts (solenoid, motor and other parts) are normal. The DSC unit and DSC HU/CM output system wiring harnesses (solenoid valve, relay system) are normal. However, the following items cannot be verified. Malfunction with intermittent occurrence of the above items Malfunction of DSC HU/CM input system wiring harnesses and parts Extremely small leaks in the DSC HU/CM internal hydraulic system

DSC HU/CM INSPECTION

1. Disconnect the DSC HU/CM connector. (See «DSC HU/CM REMOVAL/INSTALLATION»(ref-367629-S13142750152010072700000) .)
2. Connect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [13B-MSP]»(ref-367630-S30865077932010072700000) .)
3. Attach the tester lead to the DSC HU/CM harness side connector, then inspect voltage, continuity or resistance according to the standard (reference value) on the table. Standard (Reference Value)

Scheme 13

TERMINALS REFERENCE

Installation Visual Inspection

1. Inspect the following items: If there is any malfunction, replace the applicable part. Excessive play of the front ABS wheel-speed sensor Deformation of the front ABS wheel-speed sensor

Scheme 14

1. Remove the front ABS wheel-speed sensor.
2. Measure the distance between the front ABS wheel-speed sensor installation surface and the front ABS sensor rotor. This is dimension A.
3. Calculate the clearance between the front ABS wheel-speed sensor and the front ABS sensor rotor using the following formula: Clearance (mm {in}) = A-15 mm {0.59 in}
4. Verify that the clearance between the front ABS sensor rotor and the front ABS wheel-speed sensor is as indicated below. If there is any malfunction, verify the installation condition and replace if necessary. Clearance 0.3-1.0 mm {0.02-0.03 in}

Sensor Output Value Inspection

1. Turn the ignition switch off.
2. Connect the M-MDS to the DLC-2.
3. Select the following PIDs using the M-MDS: LF_WSPD (LF wheel-speed sensor) RF_WSPD (RF wheel-speed sensor)
4. Start the engine and drive the vehicle.
5. Verify that the display of the M-MDS shows the same value as the speedometer. If there is any malfunction, replace the front ABS wheel-speed sensor.

1. Inspect the following items: If there is any malfunction, replace the applicable part. Excessive looseness or play of the rear ABS wheel-speed sensor Deformation of the rear ABS wheel-speed sensor Deformation or damage of the rear ABS sensor rotor

Scheme 15

1. Verify the clearance between the rear ABS sensor rotor and the rear ABS wheel-speed sensor. If there is any malfunction, check for improper installation, and replace if necessary. Clearance 0.8-1.6 mm {0.04-0.06 in}

1. Turn the ignition switch off.
2. Connect the M-MDS to the DLC-2.
3. Select the following PIDs using the M-MDS: LR_WSPD (LR wheel-speed sensor) RR_WSPD (RR wheel-speed sensor)
4. Start the engine and drive the vehicle.
5. Verify that the display of the M-MDS shows the same value as the speedometer. If there is any malfunction, replace the rear ABS wheel-speed sensor.

BRAKE FLUID PRESSURE SENSOR INSPECTION

Note. The brake fluid pressure sensor is integrated into the DSC HU/CM and installed to the brake line of LF-RR brake system. Therefore, perform the brake fluid pressure sensor inspection with the SST installed to the brake pipe on the left front wheel.

Scheme 16

Scheme 17

1. Turn the ignition switch off.
2. Loosen the brake pipe flare nut using the commercially available flare nut wrench.
3. Disconnect the brake pipe.
4. Remove the clamp and disconnect the brake hose.
5. Install the SSTs to the brake pipe as shown in the figure.
6. Perform air bleeding of the SST and brake line from bleeder screw A.
7. Connect the M-MDS to the DLC-2.
8. Select the "MCYLI P" PID. (See «ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)]»(ref-367645-S14102857122010072700000) .)
9. Start the engine.
10. Depress the brake pedal, and verify that the fluid pressure value of the SST (gauge) and the value shown on the M-MDS are equal. If the fluid pressure values are different, replace the DSC HU/CM. (See «DSC HU/CM REMOVAL/INSTALLATION»(ref-367629-S13142750152010072700000) .)
11. Remove the SSTs after the inspection and install the brake hose, clamp and brake pipe to their original positions.
12. Perform air bleeding of the brake line. (See «AIR BLEEDING»(ref-367633-S33229966432010072700000) .)

Scheme 18