DSC Control Inspection
- Perform "Preparation".
- Connect the M-MDS to the DLC-2.
- 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 REFERENCE 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 Send the command while rotating the wheel being inspected by hand in a forward direction.
- 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
- Disconnect the DSC HU/CM connector. (See «DSC HU/CM REMOVAL/INSTALLATION»(ref-430291-S00873821072011101700000) )
- Connect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) )
- Attach the tester lead to the DSC HU/CM harness side connector, then inspect voltage, continuity or resistance according to «Standard (Reference Value)»(ref-430291-S37149395792011101700000) .
Scheme 3
| Terminal | Signal name | Connected to | Measured item | Measured terminal (measured condition) | Standard | Inspection item(s) |
|---|---|---|---|---|---|---|
| A | Ground (ABS motor) | Ground point | Continuity | A-ground point | Continuity detected | Wiring harness (A-ground point) |
| B | Power supply (ABS motor operation) | Battery | Voltage | Under any condition | B+ | Wiring harness (B-battery) |
| C | Power supply (solenoid operation) | Battery | Voltage | Under any condition | B+ | Wiring harness (C-battery) |
| D | Ground (DSC system) | Ground point | Continuity | D-ground point | Continuity detected | Wiring harness (D-ground point) |
| E | LF wheel-speed sensor (-) | LF ABS wheel-speed sensor | Continuity | E-LF ABS wheel-speed sensor connector terminal B | Continuity detected | Wiring harness (E-LF ABS wheel-speed sensor connector terminal B) |
| F | LF wheel-speed sensor (+) | LF ABS wheel-speed sensor | Continuity | F-LF ABS wheel-speed sensor connector terminal A | Continuity detected | Wiring harness (F-LF ABS wheel-speed sensor connector terminal A) |
| G | LR wheel-speed sensor (+) | LR ABS wheel-speed sensor | Continuity | G-LR ABS wheel-speed sensor connector terminal B | Continuity detected | Wiring harness (G-LR ABS wheel-speed sensor connector terminal B) |
| H | LR wheel-speed sensor (-) | LR ABS wheel-speed sensor | Continuity | H-LR ABS wheel-speed sensor connector terminal A | Continuity detected | Wiring harness (H-LR ABS wheel-speed sensor connector terminal A) |
| I | RR wheel-speed sensor (+) | RR ABS wheel-speed sensor | Continuity | I-RR ABS wheel-speed sensor connector terminal B | Continuity detected | Wiring harness (I-RR ABS wheel-speed sensor connector terminal B) |
| J | Power supply (system) | Ignition switch | Voltage | Ignition switch at ON position | B+ | Wiring harness (J-ignition switch) |
| Ignition switch is LOCK position | 1 V or less | |||||
| K | ||||||
| L | RR wheel-speed sensor (-) | RR ABS wheel-speed sensor | Continuity | L-RR ABS wheel-speed sensor connector terminal A | Continuity detected | Wiring harness (L-RR ABS wheel-speed sensor connector terminal A) |
| M | RF wheel-speed sensor (+) | RF ABS wheel-speed sensor | Continuity | M-RF ABS wheel-speed sensor connector terminal A | Continuity detected | Wiring harness (M-RF ABS wheel-speed sensor connector terminal A) |
| N | Brake switch | Brake switch | Voltage | N-ground point (Brake pedal depressed) | B+ | Wiring harness (N-brake switch) Brake switch |
| N-ground point (Brake pedal not depressed) | 1 V or less | |||||
| O | RF wheel-speed sensor (-) | RF ABS wheel-speed sensor | Continuity | O-RF ABS wheel-speed sensor connector terminal B | Continuity detected | Wiring harness (O-RF ABS wheel-speed sensor connector terminal B) |
| P | DSC OFF switch | DSC OFF switch | Continuity | P-DSC OFF switch connector terminal A) | Continuity detected | Wiring harness (P-DSC OFF switch connector terminal A) |
| Q | ||||||
| R | ||||||
| S | ||||||
| T | ||||||
| U | ||||||
| V | ||||||
| W | CAN_L | DLC-2 (CAN_L) | This terminal is used for communication and cannot be used for malfunction determination during terminal voltage inspection. Perform a DTC inspection. | |||
| X | CAN_H | DLC-2 (CAN_H) | This terminal is used for communication and cannot be used for malfunction determination during terminal voltage inspection. Perform a DTC inspection. | |||
| Y | ||||||
| Z | ||||||
| AA | ||||||
| AB | ||||||
| AC | ||||||
| AD | ||||||
| AE | ||||||
| AF | ||||||
| AG | ||||||
| AH | ||||||
| AI | ||||||
| AJ | ||||||
| AK | ||||||
| AL | ||||||
| AM | ||||||
| AN | ||||||
| AO | ||||||
| AP | ||||||
| AQ | ||||||
| AR | CAN2_H | Combined sensor | Continuity | AR-combined sensor connector terminal C | Continuity detected | Wiring harness (AR-combined sensor connector terminal C) |
| AS | CAN2_L | Combined sensor | Continuity | AS-combined sensor connector terminal B | Continuity detected | Wiring harness (AS-combined sensor connector terminal B) |
| AT | ||||||
DSC HU/CM CONNECTOR TERMINAL REFERENCE
FRONT ABS WHEEL-SPEED SENSOR INSPECTION
- Inspect the front ABS wheel-speed sensor in the same order of vehicles with ABS. (See «FRONT ABS WHEEL-SPEED SENSOR INSPECTION»(ref-430295-S13459341992011101700000) )
REAR ABS WHEEL-SPEED SENSOR INSPECTION
- Inspect the rear ABS wheel-speed sensor in the same order of vehicles with ABS. (See «REAR ABS WHEEL-SPEED SENSOR INSPECTION»(ref-430295-S34032289752011101700000) )
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 4
Scheme 5
Scheme 6
- Turn the ignition switch to the LOCK position.
- Loosen the brake pipe flare nut using the commercially available flare nut wrench.
- Disconnect the brake pipe.
- Remove the bolt and disconnect the brake hose.
- Install the SSTs to the brake pipe as shown in the illustration.
- Perform air bleeding of the SST and brake line from bleeder screw A.
- Connect the M-MDS to the DLC-2.
- Select the "MCYLI P" PID. (See «ON-BOARD DIAGNOSTIC [DYNAMIC STABILITY CONTROL (DSC)]»(ref-430293-S20178903832011101700000) )
- Start the engine.
- 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-430291-S00873821072011101700000) )
- Remove the SSTs after the inspection and install the brake hose, bolt and brake pipe to their original positions.
- Perform air bleeding of the brake line. See «AIR BLEEDING»(ref-478576-S17041232072012061100000)