Dynamic Stability Control: Diagnosis Mazda CX-7 I

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. 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-269002-S04586694032007102700000) .)
2. Connect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION[L3 WITH TC]»(ref-268969-S02639540282007102700000) ).
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.

Scheme 20

TERMINAL REFERENCE CHART

Scheme 21

1. Perform the following procedure and remove the LF ABS wheel-speed sensor. Remove the battery and battery tray. Remove the air cleaner component and air hose. (See «INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH TC]»(ref-268965-S28635226732007102700000) ).
2. Remove in the order indicated in the figure.
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 ABS wheel-speed sensor Deformation of the ABS wheel-speed sensor Deformation or damage of the ABS sensor rotor

Scheme 22

1. Verify the clearance between the ABS sensor rotor and the 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}

Scheme 23

1. Turn the ignition switch off.
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 24

1. Remove the rear seat. (See «REAR SEAT REMOVAL/INSTALLATION»(ref-269046-S15308021302007102700000) ).
2. Rear scuff plate inner. (See «REAR SCUFF PLATE REMOVAL/INSTALLATION»(ref-269050-S10900871852007102700000) ).
3. Remove the sub trunk box. (See «SUB TRUNK BOX REMOVAL/INSTALLATION»(ref-269050-S34742249512007102700000) ).
4. Remove the trunk end trim. (See «TRUNK END TRIM REMOVAL/INSTALLATION»(ref-269050-S35013984312007102700000) ).
5. Remove the trunk side trim. (See «TRUNK SIDE TRIM REMOVAL/INSTALLATION»(ref-269050-S13529011422007102700000) ).
6. Remove in the order indicated in the figure.
7. Install in the reverse order of removal.

Scheme 25

1. Remove the rear seat. (See «REAR SEAT REMOVAL/INSTALLATION»(ref-269046-S15308021302007102700000) ).
2. Rear scuff plate inner. (See «REAR SCUFF PLATE REMOVAL/INSTALLATION»(ref-269050-S10900871852007102700000) ).
3. Remove the sub trunk box. (See «SUB TRUNK BOX REMOVAL/INSTALLATION»(ref-269050-S34742249512007102700000) ).
4. Remove the trunk end trim. (See «TRUNK END TRIM REMOVAL/INSTALLATION»(ref-269050-S35013984312007102700000) ).
5. Remove the trunk side trim. (See «TRUNK SIDE TRIM REMOVAL/INSTALLATION»(ref-269050-S13529011422007102700000) ).
6. Remove in the order indicated in the figure.
7. 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 ABS wheel-speed sensor Deformation of the ABS wheel-speed sensor

Scheme 26

1. Remove the rear ABS wheel-speed sensor.
2. Measure the distance between the rear ABS wheel-speed sensor installation surface and the ABS sensor rotor. This is dimension A.
3. Calculate the clearance between the front ABS wheel-speed sensor and the ABS sensor rotor using the following formula: Clearance (mm {in}) = A-15.0
4. Verify that the clearance between the 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}

Scheme 27

1. Turn the ignition switch off.
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 ABS wheel-speed sensor Deformation of the ABS wheel-speed sensor Deformation or damage of the ABS sensor rotor

Scheme 28

1. Verify the clearance between the ABS sensor rotor and the 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}

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: 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.