FOREWORD
- Before performing the steps in Symptom Troubleshooting, perform the On-board Diagnostic Inspection. To check the DTC, follow the DTC Inspection steps. (See «DTC TABLE»(ref-244446-S06434023692006092400000) .) (See «DTC TABLE»(ref-244447-S28148229372006092400000) .)
Vehicle with ABS
- Any one or a combination of the ABS warning and BRAKE system warning lights illuminate even when the system is normal. BRAKE SYSTEM WARNING LIGHT DESCRIPTION Warning lights that may illuminate and/or flash Condition under which the light may illuminate Conditions under which the light will go out ABS, EBD control Any or all the following lights illuminate: ABS warning light BRAKE system warning light ( *1 ) Under any of the following conditions: When the front wheels are jacked up, stuck, or placed on a chassis roller, and only the front wheel ABS wheel speed sensors are spun for 20 s or more After turning ignition switch off, vehicle is driven at speed greater than 10 km/h {6.2 mph} and normal operation is confirmed. ABS: Disables control. EBD: Disable control, in cases where the light may illuminate, only when ABS HU/CM detects that wheel speed sensors determine that two or more rear wheels are malfunctioning. Enables control, if wheel speed sensors determine that three or more wheels are functioning correctly. Parking brake is not fully released while driving. Brake drag. Sudden acceleration/deceleration. Left/right or front/rear tires are different. (Size, radius, tire pressure, or wear is other than that listed on tire label.) All the following lights illuminate: ABS warning light BRAKE system warning light Battery voltage at ABS HU/CM ignition terminal J drops below approx. 9 to 10 V. ( (2) ) Battery voltage rises above approx. 10 V. (Only BRAKE system warning light goes out.) ABS: Enables control. EBD: Enables control. (1) The light will illuminate only when ABS HU/CM detects that a rear wheel-speed sensor is malfunctioning. (2) If battery voltage drops below 9 V while vehicle speed is greater than 6 km/h {3.7 mph} , the ABS HU/CM stores DTC B1318.
- Precautions during servicing of ABS The ABS is composed of electrical and mechanical parts. It is necessary to categorize malfunctions as being either electrical or hydraulic when performing troubleshooting. Malfunctions in electrical system The ABS HU/CM has an on-board diagnostic function. With this function, any one or a combination of the ABS warning light and BRAKE system warning light will illuminate when there is a problem in the electrical system. Also, past and present malfunctions are stored in the ABS HU/CM. This function can find malfunctions that do not occur during periodic inspections. Connect the WDS or equivalent to the DLC-2. Stored malfunctions will be displayed in the order of occurrence. To find out the causes of ABS malfunctions, use these on-board diagnostic results. If a malfunction occurred in the past but is now normal, the cause is likely a temporary poor connection of the wiring harness. The ABS HU/CM usually operates normally. Be careful when searching for the cause of malfunction. After repair, it is necessary to clear the DTC from the ABS HU/CM memory. Also, if the ABS related parts have been replaced, verify that no DTC is displayed after repairs. After repairing the ABS wheel-speed sensor or ABS sensor rotor, or after replacing the ABS HU/CM, the ABS warning light may not go out (*) even when the ignition switch is turned to the ON position. In this case, drive the vehicle at a speed of 10 km/h {6.2 mph} or more , make sure that ABS warning light goes out, and then clear the DTC. *The BRAKE system warning light also illuminates when there is any rear wheel deformation. When repairing, if the ABS related connectors are disconnected and the ignition switch is turned to the ON position, the ABS HU/CM will mistakenly detect a fault and record it as a malfunction. To protect the ABS HU/CM, make sure the ignition is off before connecting or disconnecting the ABS HU/CM connector. Malfunctions in hydraulic system Symptoms in a hydraulic system malfunction are similar to those in a conventional brake malfunction. However, it is necessary to determine if the malfunction is in an ABS component or the conventional brake system. The ABS hydraulic unit contains delicate mechanical parts. If foreign material gets into the component, the ABS may fail to operate. Also, it will likely become extremely difficult to find the location of the malfunction in the event that the brakes operate but the ABS does not. Make sure foreign material does not enter when servicing the ABS (e.g. brake fluid replacement, pipe removal).
Vehicle with DSC
- The ABS warning light and/or BRAKE system warning light and/or DSC indicator light and/or DSC OFF light illuminate even when the system is normal. DSC INDICATOR & BRAKE SYSTEM WARNING LIGHT DESCRIPTION Warning lights that may illuminate and/or flash Condition under which the light may illuminate Conditions under which the light will go out ABS, EBD, TCS and DSC control ABS warning light BRAKE system warning light DSC indicator light Under any of the following conditions: When the front wheels are jacked up, stuck, or placed on a chassis roller, and only the front wheel ABS wheel speed sensors are spun for 20 s or more. After turning ignition switch off, vehicle is driven at speed greater than 10 km/h {6.2 mph} and normal operation is confirmed. ABS: Disables control. EBD: Disable control, in cases where the light may illuminate, only when ABS HU/CM detects that wheel speed sensors determine that two or more wheels are malfunctioning. Enables control, if wheel speed sensors determine three or more wheels are functioning correctly. TCS: Disables control. DSC: Disables control. Parking brake is not fully released while driving. Brake drag. Sudden acceleration/deceleration. Left/right or front/rear tires are different. (Size, radius, tire pressure, or wear is other than that listed on tire label.) Battery voltage at DSC HU/CM ignition terminal drops below approx. 10 V. Battery voltage rises above approx. 10 V. ABS: Disables control. EBD: Enables control. TCS: Disables control. DSC: Disables control. Brake system warning light Brake fluid amount is low. Brake fluid level lower than recommended amount. ABS: Enables control. EBD: Enables control. TCS: Enables control. DSC: Enables control.
- Precautions during servicing of DSC The DSC is composed of electrical and mechanical parts. It is necessary to categorize malfunctions as being either electrical or hydraulic when performing troubleshooting. Malfunction in electrical system The control module has an on-board diagnostic function. With this function, the ABS warning light and/or BRAKE system warning light and/or DSC indicator light and/or DSC OFF light will illuminate when there is a problem in the electrical system. Also, past and present malfunctions are in the control module. This function can find malfunctions that do not occur during periodic inspections. Connect the WDS or equivalent to the DLC-2, the stored malfunctions will be displayed in the order of occurrence. To find out the causes of DSC malfunctions, use these on-board diagnostic results. If a malfunction occurred in the past but is now normal, the cause is likely a temporary poor connection of the wiring harness. The control module usually operates normally. Be careful when searching for the cause of malfunction. After repair, it is necessary to clear the DTC from the control module memory. Also, if the DSC related parts have been replaced, verify that no DTC is displayed after repairs. After repairing the ABS wheel-speed sensor or ABS sensor rotor, or after replacing the control module, the ABS warning light may not go out even when the ignition switch is turned to the ON position. In this case, drive the vehicle at a speed of more than 10 km/h {6.2 mph} , make sure the ABS warning light goes out, and then clear the DTC. When repairing, if the DSC related connectors are disconnected and the ignition switch is turned to the ON position, the control module will mistakenly detect a fault and record it as a malfunction. CAUTION: In DSC vehicles, when the DSC HU/CM, steering angle sensor, or combined sensor is replaced, perform the initialization procedure for each sensor. (See «STEERING ANGLE SENSOR INITIALIZATION PROCEDURE»(ref-244445-S36929774422006092400000) .) (See «COMBINED SENSOR INITIALIZATION PROCEDURE»(ref-244445-S17481721062006092400000) .) (See «STEERING ANGLE SIGNAL INITIALIZATION PROCEDURE»(ref-244445-S05794702532006092400000) .) To protect the control module, make sure the ignition is off before connecting or disconnecting the control module connector. Malfunctions in hydraulic system Symptoms in a hydraulic system malfunction are similar to those in a conventional brake malfunction. However, it is necessary to determine if the malfunction is in a DSC component or the conventional brake system. The hydraulic unit contains delicate mechanical parts. If foreign material gets into the component, the DSC may fail to operate. Also, it will likely become extremely difficult to find the location of the malfunction in the event that the brakes operate but the DSC does not. Make sure foreign material does not enter when servicing the DSC (e.g. brake fluid replacement, pipe removal).
Malfunction Data Monitor Method
- Perform the malfunction reappearance test according to malfunction reappearance mode and malfunction data monitor. The malfunction cause is found in the malfunction data.
Scheme 57
- Inspect the connection condition of each female terminal.
- Insert the male terminal, and fit the female terminal side to female terminal. Inspect if the malfunction is in the female terminal.
- Verify the symptoms, and perform troubleshooting according to the appropriate number.
| No. | Symptom |
|---|---|
| 1 | Neither ABS warning light nor BRAKE system warning light illuminate when the ignition switch is turned to the ON position. |
| 2 | ABS warning light does not illuminate when the ignition switch is turned to the ON position. |
| 3 | BRAKE system warning light does not illuminate when the ignition switch is turned to the ON position. |
| 4 | Both ABS warning light and BRAKE system warning light stay on 4 s or more when the ignition switch is turned to the ON position. |
| 5 | ABS warning light stays on 4 s or more when the ignition switch is turned to the ON position. |
| 6 | BRAKE system warning light stays on 4 s or more when the ignition switch is turned to the ON position. (Parking brake is released.) |
| 7 | Any of the following lights do not illuminate when the ignition switch is turned to the ON position. ABS warning light BRAKE system warning light DSC indicator light DSC OFF light |
| 8 | Any of the following lights remain on: ABS warning light. BRAKE system warning light DSC indicator light DSC OFF light |
| 9 | There is a malfunction in the system even though ABS warning light, BRAKE system warning light, DSC indicator light and DSC OFF light do not illuminate. |
| 10 | ABS or TCS (1) operates frequently. |
| TCS does not work correctly. | |
| 11 | DSC (2) operates frequently. |
| DSC does not work correctly. | |
| (1) DSC system contains traction control function; DSC indicator light illuminates and goes out while DSC is operating. (2) DSC indicator light illuminates and goes out while DSC is operating. | |
| (1) | DSC system contains traction control function; DSC indicator light illuminates and goes out while DSC is operating. |
| (2) | DSC indicator light illuminates and goes out while DSC is operating. |
VEHICLE WITH ABS SYMPTOM TROUBLESHOOTING
Scheme 58
Scheme 59
*1) DSC system contains traction control function; DSC indicator light illuminates and goes out while DSC is operating.
*2) DSC indicator light illuminates and goes out while DSC is operating.
NO.1 NEITHER ABS WARNING LIGHT NOR BRAKE SYSTEM WARNING LIGHT ILLUMINATE WHEN IGNITION SWITCH TURNED TO ON POSITION
| 1 | ABS warning light and BRAKE system warning light do not illuminate when the ignition switch is turned to ON position. |
|---|---|
| [TROUBLESHOOTING HINTS] Malfunction of instrument cluster or ABS HU/CM Improper configuration (instrument cluster) | |
SYMPTOM TROUBLESHOOTING
DIAGNOSTIC PROCEDURE TABLE STEP INSPECTION ACTION 1 VERIFY WHETHER MALFUNCTION IS IN COMMON POWER SUPPLY OF WARNING LIGHTS AND INDICATOR LIGHTS, OR IN OTHER WARNING LIGHTS AND INDICATOR LIGHTS Do other warning and indicator lights illuminate when the ignition switch is turned to the ON position? Yes Go to step 4. No Go to the next step. 2 INSPECT INSTRUMENT CLUSTER POWER SUPPLY FUSE Is the instrument cluster ignition power supply fuse normal? Yes Go to the next step. No Inspect for a short to ground on the circuit with the blown fuse. Repair or replace if necessary. Install appropriate amperage fuse. *3 VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (INSPECT FOR CONTINUITY BETWEEN INSTRUMENT CLUSTER POWER SUPPLY AND INSTRUMENT CLUSTER) OR INSTRUMENT CLUSTER Turn the ignition switch to the ON position. Measure the voltage at instrument cluster connector (12-pin) terminal 1G. Is the voltage approx. 12 V? Yes Replace the instrument cluster (open circuit in instrument cluster). (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) No Inspect for an open circuit between the instrument cluster and ground. Repair or replace if necessary. 4 CONFIRM DTC U1900 USING WDS OR EQUIVALENT Retrieve DTCs from the PCM, ABS and instrument cluster. Is DTC U1900 retrieved? Yes Go to the next step. No Inspect the instrument cluster. If normal, go to Step 6. 5 CONFIRM DTCS U0121, U0100 AND U0214 USING WDS OR EQUIVALENT: Retrieve DTCs from the instrument cluster. Are DTCs U0121, U0100 and U0214 retrieved? Yes Replace the instrument cluster (open circuit in instrument cluster). (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) No Inspect network communication for related system malfunction. Repair or replace if necessary. 6 CONFIRM DTC B2477 FOR INSTRUMENT CLUSTER USING WDS OR EQUIVALENT Is DTC B2477 retrieved? Yes Perform instrument cluster configuration. (See INSTRUMENT CLUSTER CONFIGURATION .) No Replace the ABS HU/CM. (See ABS HU/CM REMOVAL/INSTALLATION .)
Scheme 60
- When performing an asterisked (*) troubleshooting inspection, slightly shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, verify that the connectors, terminals and wiring harness are connected correctly and undamaged.
NO.2 ABS WARNING LIGHT DOES NOT ILLUMINATE WHEN IGNITION SWITCH TURNED TO ON POSITION
| 2 | ABS warning light does not illuminate when the ignition switch is turned to the ON position. |
|---|---|
| [TROUBLESHOOTING HINTS] Malfunction of instrument cluster or ABS HU/CM | |
SYMPTOM TROUBLESHOOTING
DIAGNOSTIC PROCEDURE TABLE STEP INSPECTION ACTION 1 CONFIRM DTC U1900 USING WDS OR EQUIVALENT Retrieve DTCs from the PCM, ABS and instrument cluster. Is DTC U1900 retrieved? Yes Go to the next step. No Inspect the instrument cluster. If normal, go to the next step. 2 CONFIRM DTCS U0121, U0100 AND U0214 USING WDS OR EQUIVALENT: Retrieve DTCs from the instrument cluster. Are DTCs U0121, U0100 and U0214 retrieved? Yes Replace the instrument cluster (open circuit in instrument cluster). (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) No Inspect the network communication for a related system malfunction. Repair or replace if necessary
Scheme 61
NO.3 BRAKE SYSTEM WARNING LIGHT DOES NOT ILLUMINATE WHEN IGNITION SWITCH TURNED TO ON POSITION
| 3 | BRAKE system warning light does not illuminate when the ignition switch is turned to the ON position. |
|---|---|
| [TROUBLESHOOTING HINTS] Malfunction of instrument cluster or ABS HU/CM | |
SYMPTOM TROUBLESHOOTING
DIAGNOSTIC PROCEDURE TABLE STEP INSPECTION ACTION 1 CONFIRM DTC U1900 USING WDS OR EQUIVALENT Retrieve DTCs from the PCM, ABS and instrument cluster. Is DTC U1900 retrieved? Yes Go to the next step. No Inspect the instrument cluster. If normal, go to the next step. 2 CONFIRM DTCS U0121, U0100 AND U0214 USING WDS OR EQUIVALENT: Retrieve DTCs from the instrument cluster. Are DTCs U0121, U0100 and U0214 retrieved? Yes Replace the instrument cluster (open circuit in instrument cluster). (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) No Inspect the network communication for a related system malfunction. Repair or replace if necessary
Scheme 62
NO. 4 BOTH ABS WARNING LIGHT AND BRAKE SYSTEM WARNING LIGHT STAY ON 4 SECONDS OR MORE WHEN IGNITION SWITCH TURNED TO ON POSITION
| 4 | Both ABS warning light and BRAKE system warning light stay on 4 seconds or more when the ignition switch is turned to the ON position. |
|---|---|
| [TROUBLESHOOTING HINTS] ABS HU/CM detects ABS proportioning system malfunction. ABS HU/CM detects low voltage in power supply (ABS CM ignition terminal J voltage is below about 9 to 10 V). ABS HU/CM does not operate. Malfunction of communication network. | |
SYMPTOM TROUBLESHOOTING
DIAGNOSTIC PROCEDURE TABLE STEP INSPECTION ACTION 1 INSPECT ABS HU/CM POWER SUPPLY FUSE Is the ABS HU/CM ignition power supply fuse normal? Yes Go to the next step. No Inspect for a short to ground on circuit with the blown fuse. Repair or replace if necessary. Install appropriate amperage fuse. 2 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY AND SHORTS Perform DTC inspection. Is error message displayed regarding communication between ABS HU/CM and WDS or equivalent? Yes If a communication error message is displayed even after inspecting according to the procedure displayed on the WDS or equivalent, go to step 10. No Go to the next step. 3 INSPECT FOR DTCS IN ABS HU/CM Have DTCs been stored in memory? Yes Perform the applicable DTC inspection. (See DTC TABLE .) No Go to the next step. 4 INSPECT WARNING LIGHT OPERATION Turn on the all warning light on instrument cluster using the instrument cluster input/output check code. (See INSTRUMENT CLUSTER INPUT/OUTPUT CHECK MODE .) Do the ABS and BRAKE system warning light illuminate? Yes Go to the next step. No Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) 5 INSPECT ABS HU/CM IGNITION POWER SUPPLY SYSTEM (TERMINAL J) Inspect the voltage for datalogger ABS_VOLT item using the WDS or equivalent. Specification: approx. 10 V Is the voltage within specification? Yes Replace the ABS HU/CM (open or short in ground circuit in ABS HU/CM). (See ABS HU/CM REMOVAL/INSTALLATION .) No Go to the next step. 6 INSPECT BATTERY Is the battery voltage normal? Yes Go to the next step. No Inspect the battery and charging system. (See BATTERY INSPECTION [LF] .) (See GENERATOR INSPECTION [LF] .) 7 INSPECT CHARGING SYSTEM Is the battery voltage normal with the electrical load (A/C, headlight, etc.) on and the engine idling? Yes Go to the next step. No Inspect the charging system (drive belt tension, generator, etc.). (See GENERATOR INSPECTION [LF] .) *8 INSPECT WIRING HARNESS BETWEEN ABS HU/CM POWER SUPPLY AND ABS HU/CM FOR CONTINUITY Disconnect the ABS HU/CM connector. Is the voltage approx. 12 V at connector terminal Z? Yes Go to the next step. No Inspect the ABS HU/CM connector for secure connection. *9 INSPECT WIRING HARNESS BETWEEN ABS HU/CM GROUND FOR CONTINUITY Turn the ignition switch to the LOCK position. Is there continuity between connector terminal D and the ground? Yes If a malfunction error message is displayed on the WDS or equivalent in Step 1 inspection, go to the next step. If a malfunction error message is not displayed on the WDS or equivalent in Step 1 inspection, troubleshooting is completed. No Repair the wiring harness between ABS HU/CM and ground. *10 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY Is there continuity between connector terminal Z, Y and DLC-2? Yes Go to the next step. No Repair the wiring harness between ABS HU/CM and DLC-2. *11 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO BATTERY Is the voltage approx. 12 V at connector terminal Z, Y? Yes Repair the wiring harness between ABS HU/CM and DLC-2. No Go to the next step. *12 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND Is there continuity between connector terminal Z, Y and DLC-2? Yes Repair the wiring harness between ABS HU/CM and DLC-2. No Replace the ABS HU/CM (communication circuit malfunction in ABS HU/CM). (See ABS HU/CM REMOVAL/INSTALLATION .)
Scheme 63
- When performing an asterisked (*) troubleshooting inspection, slightly shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, verify that the connectors, terminals and wiring harness are connected correctly and undamaged.
NO.5 ABS WARNING LIGHT STAYS ON 4 SECONDS OR MORE WHEN IGNITION SWITCH TURNED TO ON POSITION
| 5 | ABS warning light stays on 4 seconds or more when the ignition switch to the ON position. |
|---|---|
| [TROUBLESHOOTING HINTS] ABS HU/CM detects ABS system malfunction. | |
SYMPTOM TROUBLESHOOTING
DIAGNOSTIC PROCEDURE TABLE STEP INSPECTION ACTION 1 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY AND SHORTS Perform the DTC inspection. Is an error message displayed regarding communication between the ABS HU/CM and the WDS or equivalent? Yes If a communication error message is displayed even after inspecting according to procedures displayed in the WDS or equivalent, go to Step 4. No Go to the next step. 2 INSPECT FOR DTCs IN ABS HU/CM Have DTCs been stored in memory? Yes Perform the applicable DTC inspection. (See DTC TABLE .) No Go to the next step. 3 INSPECT WARNING LIGHT OPERATION Turn on the all warning light on instrument cluster using the instrument cluster input/output check code 26. (See INSTRUMENT CLUSTER INPUT/OUTPUT CHECK MODE .) Does the warning light illuminate? Yes Replace the ABS HU/CM (open circuit or short to ground in ABS HU/CM). (See ABS HU/CM REMOVAL/INSTALLATION .) No Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) *4 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY Disconnect the ABS HU/CM connector. Is there continuity between connector terminal Z, Y and DLC-2? Yes Go to the next step. No Repair the wiring harness between the ABS HU/CM and DLC-2. *5 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO B+ Is the voltage approx. 12 V at connector terminal Z, Y? Yes Repair the wiring harness between the ABS HU/CM and DLC-2. No Go to the next step. *6 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND Is there continuity between connector terminal Z, Y and ground? Yes Repair the wiring harness between the ABS HU/CM and DLC-2. No Replace the ABS HU/CM (communication circuit malfunction in ABS HU/CM). (See ABS HU/CM REMOVAL/INSTALLATION .)
Scheme 64
- When performing an asterisked (*) troubleshooting inspection, slightly shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, verify that the connectors, terminals and wiring harness are connected correctly and undamaged.
NO.6 BRAKE SYSTEM WARNING LIGHT STAYS ON 4 SECONDS OR MORE WHEN IGNITION SWITCH TURNED TO ON POSITION
| 6 | BRAKE system warning light stays on 4 seconds or more when the ignition switch is turned to the ON position. (Parking brake is released.) |
|---|---|
| [TROUBLESHOOTING HINTS] Malfunction of instrument cluster or ABS HU/CM Short to ground in circuit in parking brake switch and/or brake fluid level sensor | |
SYMPTOM TROUBLESHOOTING
DIAGNOSTIC PROCEDURE TABLE STEP INSPECTION ACTION 1 INSPECT BRAKE FLUID LEVEL Is brake fluid level normal? Yes Go to the next step. No Add brake fluid. *2 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY AND SHORTS Monitor the one or more items of ABS HU/CM using the WDS or equivalent datalogger function. Is error message displayed regarding communication between ABS HU/CM and WDS or equivalent? Yes If a communication error message is displayed even after inspecting according to procedures displayed on WDS or equivalent. Go to next step 6. No Go to the next step. 3 INSPECT FOR DTCs IN ABS HU/CM Have DTCs been stored in memory? Yes Perform the applicable DTC inspection. (See DTC TABLE .) No Go to the next step. 4 INSPECT WARNING LIGHT OPERATION Turn on the all warning light on instrument cluster using the instrument cluster input/output check code 26. (See INSTRUMENT CLUSTER INPUT/OUTPUT CHECK MODE .) Does the warning light illuminate? Yes Go to the next step. No Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) 5 VERIFY WHETHER MALFUNCTION IS IN PARKING BRAKE SWITCH OR BRAKE FLUID LEVEL SENSOR, OR IN SOME OTHER PART Disconnect in the following order: Parking brake switch connector Brake fluid level sensor connector Does the BRAKE system warning light go out with ignition switch turned to the ON position? Yes Replace the parking brake switch and/or brake fluid level sensor (Short with some internal part). (See MASTER CYLINDER REMOVAL/INSTALLATION .) (See PARKING BRAKE LEVER REMOVAL/INSTALLATION .) No Perform the following inspections. Repair if necessary. Short to ground in the wiring harness between the instrument cluster (BRAKE system warning light) and parking brake switch. Short to ground in the wiring harness between the instrument cluster (BRAKE system warning light) and brake fluid level sensor. If inspection results are okay, replace the ABS HU/CM. (See ABS HU/CM REMOVAL/INSTALLATION .) *6 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY Disconnect the ABS HU/CM connector. Is there continuity between connector terminal Z, Y and DLC-2? Yes Go to the next step. No Repair the wiring harness between the ABS HU/CM and DLC-2. *7 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO B+ Is the voltage approx. 12 V at connector terminal Z, Y? Yes Repair the wiring harness between the ABS HU/CM and DLC-2. No Go to the next step. *8 INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND Is there continuity between connector terminal Z, Y and ground? Yes Repair the wiring harness between the ABS HU/CM and DLC-2. No Replace the ABS HU/CM (communication circuit malfunction in ABS HU/CM). (See ABS HU/CM REMOVAL/INSTALLATION .)
Scheme 65
- When performing an asterisked (*) troubleshooting inspection, slightly shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, verify that the connectors, terminals and wiring harness are connected correctly and undamaged.
NO.7 ANY OF THE FOLLOWING LIGHTS DO NOT ILLUMINATE WHEN IGNITION SWITCH TURNED TO ON POSITION: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR DSC OFF LIGHT)
| 7 | Any of the following lights do not illuminate when the ignition switch is turned to the ON position: (ABS warning light, BRAKE system warning light, DSC indicator light and/or DSC OFF light). |
|---|---|
| [TROUBLESHOOTING HINTS] Inspect each light in the instrument cluster for malfunction Poor connection at DSC HU/CM connector | |
SYMPTOM TROUBLESHOOTING
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT FOR DTCS IN DSC HU/CM Inspect the DTC for the DSC ON-BOARD DIAGNOSTIC SYSTEM. Have DTCs been stored in memory? | Yes | Perform the applicable DTC inspection. (See DTC TABLE .) |
| No | Go to the next step. | ||
| 2 | INSPECT WHETHER MALFUNCTION IS IN INSTRUMENT CLUSTER SYSTEM OR OTHER SYSTEM Do other warning and indicator lights illuminate when the ignition switch is turned to the ON position? | Yes | Go to the next step. |
| No | Inspect or repair the instrument cluster (power supply system, ground system). | ||
| 3 | VERIFY THAT DSC HU/CM CONNECTOR IS CONNECTED Is the DSC HU/CM securely connected? | Yes | Go to the next step. |
| No | Connect the DSC HU/CM connector securely, then go to the next step. | ||
| 4 | VERIFY THAT DSC HU/CM CONNECTOR TERMINAL OR RELATED CONNECTOR TERMINALS ARE CONNECTED Are DSC HU/CM connector terminal, instrument cluster connector terminal, or related connector terminals securely connected? | Yes | Replace the DSC HU/CM. (See DSC HU/CM REMOVAL/INSTALLATION .) |
| No | Securely connect DSC HU/CM connector terminal and related connector terminals. | ||
DIAGNOSTIC PROCEDURE TABLE
NO.8 ANY OF THE FOLLOWING LIGHTS REMAIN ON: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR DSC OFF LIGHT)
| 8 | Any of the following lights remain on: (ABS warning light, BRAKE system warning light, DSC indicator light and/or DSC OFF light) |
|---|---|
| [TROUBLESHOOTING HINTS] Brake fluid amount is low Parking brake does not release No connection at DSC HU/CM connector (When DSC HU/CM connector is disconnected, ABS warning light and BRAKE system warning light illuminate) DSC HU/CM detected malfunction (Input and output device malfunction) DSC HU/CM detects low voltage in power supply DSC HU/CM ground malfunction (When DSC HU/CM ground is not securely connected, ABS warning light and BRAKE system warning light illuminate but diagnostic trouble code does not displayed) DSC HU/CM does not operate (DSC HU/CM malfunction) | |
SYMPTOM TROUBLESHOOTING
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT BRAKE FLUID AMOUNT AND VERIFY THAT PARKING BRAKE RELEASES Is the brake fluid amount normal? Is the parking brake lever released? | Yes | Go to the next step. |
| No | Add brake fluid or release parking brake lever. | ||
| 2 | INSPECT DTCS IN DSC HU/CM Inspect the DTC for the DSC ON-BOARD DIAGNOSTIC SYSTEM. Have DTCs been stored in memory? | Yes | Perform inspection using appropriate DTC. (See DTC TABLE .) |
| No | Go to the next step. | ||
| 3 | INSPECT WHETHER MALFUNCTION IS IN CONTROL MODULE CONNECTOR, TERMINAL OR OTHER Do the ABS warning light and BRAKE system warning light go out after 4 s when the ignition switch is turned to the ON position? | Yes | Temporary poor connection in control module connector. Inspect DSC HU/CM connector, then go to Step 6. Inspect DSC HU/CM connector terminal, then go to Step 7. |
| No | Go to the next step. | ||
| 4 | INSPECT BATTERY Is the battery voltage normal? | Yes | Go to the next step. |
| No | Inspect the battery and charging system. (See BATTERY INSPECTION [LF] .) (See GENERATOR INSPECTION [LF] .) | ||
| 5 | INSPECT CHARGING SYSTEM Is the battery voltage normal with electrical load (A/C, headlight, etc.) on and engine idling? | Yes | Go to the next step. |
| No | Inspect the charging system (drive belt tension, generator, etc.). (See GENERATOR INSPECTION [LF] .) | ||
| 6 | VERIFY THAT DSC HU/CM CONNECTOR IS CONNECTED Is the DSC HU/CM securely connected? | Yes | Go to the next step. |
| No | Connect the DSC HU/CM connector securely, then go to the next step. | ||
| 7 | VERIFY THAT DSC HU/CM CONNECTOR TERMINAL OR RELATED CONNECTOR TERMINALS ARE CONNECTED Are the DSC HU/CM connector terminal or instrument cluster connector terminal etc. related connector terminals securely connected? | Yes | Replace the DSC HU/CM. (See DSC HU/CM REMOVAL/INSTALLATION .) |
| No | Securely connect the DSC HU/CM connector terminal and related connector terminals. | ||
DIAGNOSTIC PROCEDURE TABLE
NO.9 THERE IS A MALFUNCTION IN THE SYSTEM EVEN THOUGH ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND DSC OFF LIGHT DO NOT ILLUMINATE
| 9 | There is a malfunction in the system even though the ABS warning light, BRAKE system warning light, DSC indicator light and DSC OFF light do not illuminate. |
|---|---|
| [TROUBLESHOOTING HINTS] There is a mechanical malfunction in system | |
SYMPTOM TROUBLESHOOTING
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT DSC HU/CM FOR DTCs Inspect the DTC for the DSC ON-BOARD DIAGNOSTIC SYSTEM. Have DTCs been stored in memory? | Yes | Perform the applicable DTC inspection. (See DTC TABLE .) |
| No | Go to the next step. | ||
| 2 | INSPECT DSC SYSTEM Perform DSC system inspection. (See DSC SYSTEM INSPECTION .) Is the system normal? | Yes | Inspect the conventional brake system. |
| No | Repair or replace any malfunctioning part. | ||
DIAGNOSTIC PROCEDURE TABLE
NO.10 ABS OR TCS*1 OPERATES FREQUENTLY/TCS DOES NOT WORK CORRECTLY*1: DSC SYSTEM FUNCTION CONTAINS TRACTION CONTROL FUNCTION, DSC INDICATOR LIGHT GOES ON AND OFF WHILE DSC IS OPERATING
| 10 | ABS or TCS ( *1 ) operates frequently./TCS does not work correctly. ( *1 ): DSC system function contains traction control function; DSC indicator light goes on and off while DSC is operating. |
|---|---|
| [TROUBLESHOOTING HINTS] There is a difference in size or air pressure between the front and rear tires Incorrect ABS wheel-speed signal is input to DSC HU/CM There is a malfunction in the engine control system (TCS malfunction) | |
SYMPTOM TROUBLESHOOTING
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT DTCS IN DSC HU/CM Inspect the DTC for the DSC ON-BOARD DIAGNOSTIC SYSTEM. Have DTCs been stored in memory? | Yes | Perform the applicable DTC inspection. (See DTC TABLE .) |
| No | Go to the next step. | ||
| 2 | INSPECT TIRE SIZE AND AIR PRESSURE Inspect the tire size and the air pressure. Are size and air pressure as specified? | Yes | Go to the next step. |
| No | Replace with specified tires and adjust tire air pressure. | ||
| 3 | INSPECT ABS WHEEL-SPEED SENSOR OUTPUT VALUE Inspect the output value from the ABS wheel-speed sensor. (See SENSOR OUTPUT VALUE INSPECTION .) (See SENSOR OUTPUT VALUE INSPECTION .) Is the output value normal? | Yes | Find that malfunctioning part according to "INTERMITTENT CONCERN TROUBLESHOOTING". |
| No | ABS wheel-speed sensor installation inspection: Inspect the sensor for looseness and verify that it is securely installed. Sensor rotor installation inspection: Inspect the sensor rotor for poor installation and chipping of sensor rotor teeth. (If sensor rotor is installed poorly, it may cause output of abnormal wave form at high speed.) | ||
DIAGNOSTIC PROCEDURE TABLE
NO.11 DSC*2 OPERATES FREQUENTLY/DSC DOES NOT WORK CORRECTLY *2: DSC INDICATOR LIGHT GOES ON AND OFF WHILE DSC IS OPERATING
| 11 | DSC ( *2 ) operates frequently. /DSC does not work correctly. ( *2 ): DSC indicator light goes on and off while DSC is operating. |
|---|---|
| [TROUBLESHOOTING HINTS] DSC HU/CM detected malfunction (input and output device malfunction) Poor installation of yaw rate sensor, lateral-G sensor and/or steering angle sensor (If any of the above sensors are poorly installed, DSC may operate intermittently) When replacing the DSC HU/CM, combined sensor or steering angle sensor, initialization is not performed. (If initialization is not performed correctly, DSC may not work correctly) | |
SYMPTOM TROUBLESHOOTING
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT DSC HU/CM FOR DTCs Inspect the DTC for the DSC ON-BOARD DIAGNOSTIC SYSTEM. Have DTCs been recorded in memory? | Yes | Perform the applicable DTC inspection. (See DTC TABLE .) |
| No | Go to the next step. | ||
| 2 | VERIFY THAT EACH SENSOR IS INSTALLED Are the combined sensor and steering angle sensor securely installed? | Yes | Go to the next step. |
| No | Install sensor securely. | ||
| *3 | VERIFY THAT EACH SENSOR IS INITIALIZED Was initialization performed after replacement of the DSC HU/CM, combined sensor or steering angle sensor? | Yes | Find malfunctioning part according to "INTERMITTENT CONCERN TROUBLESHOOTING." |
| No | Perform initialization procedure. (See COMBINED SENSOR INITIALIZATION PROCEDURE .) (See STEERING ANGLE SENSOR INITIALIZATION PROCEDURE .) | ||
DIAGNOSTIC PROCEDURE TABLE