Dynamic Stability Control: Diagnosis Mazda CX-7 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 s or less each time they are switched on. DSC CONTROL INSPECTION CHART Command name Inspected wheels Understeer 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-375420-S09965576812010102800000) .)
2. Connect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [L3 WITH TC]»(ref-375338-S37461824502010102800000) .) (See «BATTERY REMOVAL/INSTALLATION [L5]»(ref-375359-S31806842452010102800000) .)
3. Attach the tester lead to the DSC HU/CM wiring harness-side connector, then inspect voltage, continuity or resistance according to the standard (reference value) on the table.

Scheme 16

DSC HU/CM CONNECTOR TERMINALS REFERENCE CHART

Scheme 17

1. Perform the following procedure and remove the LF ABS wheel-speed sensor. Remove the battery and battery tray. (See «BATTERY REMOVAL/INSTALLATION [L3 WITH TC]»(ref-375338-S37461824502010102800000) .) (See «BATTERY REMOVAL/INSTALLATION [L5]»(ref-375359-S31806842452010102800000) .) Remove the air cleaner component and air hose. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L3 WITH TC]»(ref-375331-S03672667482010102800000) .) (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L5]»(ref-375352-S14647925242010102800000) .)
2. Remove in the order indicated in the table.
3. Install in the reverse order of removal.

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 Deformation or damage of the front ABS sensor rotor

Scheme 18

1. Verify the clearance between the front ABS sensor rotor and the front ABS wheel-speed sensor. If there is any malfunction, check for improper installation, and replace if necessary. Clearance 0.7-1.5 mm {0.028-0.059 in}

Sensor Output Value Inspection

1. Turn the ignition switch to the LOCK position.
2. Connect the M-MDS to the DLC-2.
3. Select the following PIDs using the M-MDS: WSPD_LF (LF ABS wheel-speed sensor) WSPD_RF (RF ABS 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.

Scheme 19

1. Remove the rear seat cushion. (See «REAR SEAT REMOVAL/INSTALLATION»(ref-375390-S34221810972010102800000) .)
2. Remove in the order indicated in the table.
3. Install in the reverse order of removal.

Scheme 20

1. Remove the rear seat cushion. (See «REAR SEAT REMOVAL/INSTALLATION»(ref-375390-S34221810972010102800000) .)
2. Remove in the order indicated in the table.
3. Install in the reverse order of removal.

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

Scheme 21

1. Remove the rear ABS wheel-speed sensor.
2. Measure the distance between the rear ABS wheel-speed sensor installation surface and the rear ABS sensor rotor. This is dimension A.
3. Calculate the clearance between the rear ABS wheel-speed sensor and the rear ABS sensor rotor using the following formula: Clearance (mm {in}) = A-15.0
4. Verify that the clearance between the rear ABS sensor rotor and the rear ABS wheel-speed sensor is as indicated below. If there is any malfunction, replace it. Clearance 0.3-1.1 mm {0.012-0.043 in}

1. Turn the ignition switch to the LOCK position.
2. Connect the M-MDS to the DLC-2.
3. Select the following PIDs using the M-MDS: WSPD_LR (LR ABS wheel-speed sensor) WSPD_RR (RR ABS 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.

1. Inspect the following items: If there is any malfunction, replace the applicable part. Excessive 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 22

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 0.3-1.1 mm {0.012-0.043 in}

1. Turn the ignition switch to the LOCK position.
2. Connect the M-MDS to the DLC-2.
3. Select the following PIDs using the M-MDS: WSPD_LR (LR ABS wheel-speed sensor) WSPD_RR (RR ABS 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 23

Scheme 24

Scheme 25

1. Turn the ignition switch off.
2. Disconnect the brake pipe flare nut area using a commercially available flare nut wrench.
3. Remove the clamp and disconnect the brake hose.
4. Install the SSTs to the brake pipe as shown in the figure.
5. Bleed the brake line and the SSTs of air. Bleed the air from the SSTs using bleeder screw A.
6. Connect the M-MDS to the DLC-2.
7. After the vehicle is identified, select the following items from the initialization screen of the M-MDS. When using the IDS (laptop PC) Select "DataLogger". Select "Modules". Select "ABS". When using the PDS (Pocket PC) Select "Module Tests". Select "ABS". Select "DataLogger".
8. Select the "MCYLI P" PID.
9. Start the engine.
10. Depress the brake pedal, and confirm that the fluid pressure value of the SST (Gauge) and the value shown on the M-MDS are equal If the fluid pressures are different, replace the DSC HU/CM. (See «DSC HU/CM REMOVAL/INSTALLATION»(ref-375420-S09965576812010102800000) .)
11. After the inspection, remove the SSTs , install the brake hose, clamp, and brake pipe to the original positions, and then bleed the air from the brake line. (See «AIR BLEEDING»(ref-375339-S29185173622010102800000) .)

Scheme 26

1. Remove in the order indicated in the table.
2. Install in the reverse order of removal.