Dynamic Stability Control/roll Stability Control: Diagnosis Mazda CX-9 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/RSC 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. BRAKE PRESSURE RETENTION REFERENCE 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 V_LF_INL OFF OFF OFF ON V_LF_OTL OFF V_LR_INL ON V_LR_OTL OFF V_RF_INL ON V_RF_OTL OFF V_RR_INL ON V_RR_OTL 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/RSC HU/CM operation click sound is heard. Performing the inspection above determines the following: The DSC/RSC HU/CM brake lines are normal. The DSC/RSC HU/CM hydraulic system is not significantly abnormal (including DSC/RSC HU/CM). The DSC/RSC HU/CM internal electrical parts (solenoid, motor and other parts) are normal. The DSC/RSC unit and DSC/RSC 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/RSC HU/CM input system wiring harnesses and parts Extremely small leaks in the DSC/RSC HU/CM internal hydraulic system

DSC/RSC HU/CM INSPECTION

1. Disconnect the DSC/RSC HU/CM connector. See «DSC/RSC HU/CM REMOVAL/INSTALLATION»(ref-345371-S28492449652009102000000) .
2. Connect the negative battery cable. See «BATTERY REMOVAL/INSTALLATION [MZI-3.7]»(ref-345358-S08633229842009102000000) .
3. Attach the tester lead to the DSC/RSC HU/CM harness side connector, then inspect voltage, continuity or resistance according to the standard (reference value) on the table.

Scheme 13

CONNECTOR TERMINAL REFERENCE CHART

Scheme 14

1. When removing the right front ABS wheel-speed sensor, perform the following procedure. Remove the coolant reserve tank installation bolts and move the coolant reserve tank. See «COOLANT RESERVE TANK REMOVAL/INSTALLATION [MZI-3.7]»(ref-345349-S27340291352009102000000) . Remove the power steering reserve tank installation bolt and nut, and move the power steering reserve tank. See «POWER STEERING OIL PUMP REMOVAL/INSTALLATION»(ref-345338-S07129672902009102000000) .
2. When removing the left front ABS wheel-speed sensor, perform the following procedure: Remove the air cleaner case. See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZI-3.7]»(ref-345348-S33859003282009102000000) .
3. Remove in the order indicated in the table.
4. 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 15

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}

Sensor Output Value Inspection

1. Turn the ignition switch off.
2. Connect the M-MDS to the DLC-2.
3. 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".
4. Select the following PIDs using the M-MDS: WSPD_LF (LF ABS wheel-speed sensor) WSPD_RF (RF ABS wheel-speed sensor)
5. Start the engine and drive the vehicle.
6. 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 16

1. Remove the trunk box. See «TRUNK BOX REMOVAL/INSTALLATION»(ref-345331-S28817313762009102000000) .
2. Remove the seat side box. See «SEAT SIDE BOX REMOVAL/INSTALLATION»(ref-345331-S04400711882009102000000) .
3. Remove the third-row seat. See «THIRD-ROW SEAT REMOVAL/INSTALLATION»(ref-345332-S37062980262009102000000) .
4. Remove the rear scuff plate inner. See «REAR SCUFF PLATE REMOVAL/INSTALLATION»(ref-345331-S02668570962009102000000) .
5. Remove the third-row seat belt lower anchor installation bolt. See «THIRD-ROW SEAT BELT REMOVAL/INSTALLATION»(ref-345333-S30110355222009102000000) .
6. Remove the trunk side trim. See «TRUNK SIDE TRIM REMOVAL/INSTALLATION»(ref-345331-S20889935252009102000000) .
7. Remove in the order indicated in the table.
8. Install in the reverse order of removal.

Scheme 17

1. Remove the trunk box. See «TRUNK BOX REMOVAL/INSTALLATION»(ref-345331-S28817313762009102000000) .
2. Remove the seat side box. See «SEAT SIDE BOX REMOVAL/INSTALLATION»(ref-345331-S04400711882009102000000) .
3. Remove the third-row seat. See «THIRD-ROW SEAT REMOVAL/INSTALLATION»(ref-345332-S37062980262009102000000) .
4. Remove the rear scuff plate inner. See «REAR SCUFF PLATE REMOVAL/INSTALLATION»(ref-345331-S02668570962009102000000) .
5. Remove the third-row seat belt lower anchor installation bolt. See «THIRD-ROW SEAT BELT REMOVAL/INSTALLATION»(ref-345333-S30110355222009102000000) .
6. Remove the trunk side trim. See «TRUNK SIDE TRIM REMOVAL/INSTALLATION»(ref-345331-S20889935252009102000000) .
7. Remove in the order indicated in the table.
8. 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 18

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 {0.60 in}
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}

1. Turn the ignition switch off.
2. Connect the M-MDS to the DLC-2.
3. 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".
4. Select the following PIDs using the M-MDS: WSPD_LR (LR ABS wheel-speed sensor) WSPD_RR (RR ABS wheel-speed sensor)
5. Start the engine and drive the vehicle.
6. 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 19

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 0.95-1.75 mm {0.038-0.068 in}

1. Turn the ignition switch off.
2. Connect the M-MDS to the DLC-2.
3. 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".
4. Select the following PIDs using the M-MDS: WSPD_LR (LR ABS wheel-speed sensor) WSPD_RR (RR ABS wheel-speed sensor)
5. Start the engine and drive the vehicle.
6. 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 RF- LR brake system. Therefore, perform the brake fluid pressure sensor inspection with the SST installed to the brake pipe on the left front wheel.

Scheme 20

Scheme 21

Scheme 22

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 "MCYLIP" 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/RSC HU/CM. See «DSC/RSC HU/CM REMOVAL/INSTALLATION»(ref-345371-S28492449652009102000000) .
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.

Scheme 23

1. Remove the dashboard under cover (LH). See «DASHBOARD REMOVAL/INSTALLATION»(ref-345331-S28664278972009102000000) .
2. Remove the hood release lever. See «HOOD LATCH AND RELEASE LEVER REMOVAL/INSTALLATION»(ref-345344-S38720975792009102000000) .
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.