Diagnostic procedure
NO.2 ABS WARNING LIGHT OR BRAKE SYSTEM WARNING LIGHT STAYS ON MORE THAN 4 SECONDS WITH IGNITION SWITCH ON - DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT BRAKE FLUID LEVEL Is brake fluid level okay? |
Yes | Go to next step. |
| No | Add brake fluid. | ||
| 2 | INSPECT ABS HU/CM IGNITION POWER SUPPLY FUSE Is ABS HU/CM power supply fuse okay? |
Yes | Go to next step. |
| No | Check for a short to ground on blown fuse's circuit. Repair or replace as necessary. Install appropriate amperage fuse. |
||
| 3 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC (DATA LINK CONNECTOR) FOR CONTINUITY OR SHORT CIRCUIT Perform DTC inspection. Is error message displayed regarding communication between ABS HU/CM and WDS or equivalent? |
Yes | Go to next step. |
| No | If a communication error message is displayed even after inspecting according to procedures displayed on the WDS or equivalent, go to Step 7. | ||
| 4 | CHECK FOR DTCS IN ABS HU/CM Have DTCs been recorded in memory? |
Yes | Perform inspection using appropriate DTC. |
| No | Go to next step. | ||
| 5 | INSPECT PID/DATA IN ABS HU/CM Inspect the following items using WDS or equivalent PID/DATA monitor function.
Is ABSLAMP ON after more than 4 seconds with ignition switch to ON position? |
Yes | Go to next step. |
| No | ABS system is normal. | ||
| 6 | INSPECT ABS HU/CM IGNITION POWER SUPPLY SYSTEM (TERMINAL Z) Check the voltage for PID/DATA monitor ABS_BOLT item. Specification: above 10 V Is voltage within specification? |
Yes | Go to Step 17. |
| No | Go to next step. | ||
| 7 | INSPECT BATTERY Is battery voltage normal? |
Yes | If a communication error message is displayed on WDS or equivalent in Step 2 inspection, go to next step. If a communication error message is not displayed on WDS or equivalent in Step 2 inspection, go to Step 10. |
| No | Perform inspection of battery and charging system. | ||
| 8 | VERIFY THAT ABS HU/CM IS CONNECTED Is ABS HU/CM securely connected? |
Yes | Go to Step 10. |
| No | Connect ABS HU/CM connector securely, then go to next step. | ||
| 9 | CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT REOCCUR AFTER ABS HU/CM IS CONNECTED Do ABS warning light and BRAKE system warning light go out after more than 4 seconds with ignition switch at ON position? |
Yes | Temporary poor connection in ABS HU/CM connector. Inspect connector and terminal. |
| No | Go to next step. | ||
| *10 | VERIFY THAT ABS HU/CM TERMINALS Z AND D ARE CONNECTED Does malfunction symptom reoccur when ABS HU/CM terminals Z and D are shaken while the ignition switch is at ON position? |
Yes | Securely connect ABS HU/CM terminals Z and D, then go to next step. |
| No | Go to Step 12. | ||
| 11 | CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT REOCCUR AFTER ABS HU/CM TERMINALS Z AND D ARE CONNECTED Do ABS warning light and BRAKE system warning light go out after more than 4 seconds with ignition switch at ON position? |
Yes | Temporary poor connection at terminal. Inspect ABS HU/CM connector and terminal. |
| No | Go to next step. | ||
| *12 | INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND ABS HU/CM (TERMINAL Z) FOR VOLTAGE
CAUTION:
Turn ignition switch to LOCK position. Disconnect ABS HU/CM connector. Is voltage approximately 12 V at ABS HU/CM terminal Z? |
Yes | Go to next step. |
| No | Repair wiring harness between fuse block and ABS HU/CM (Terminal Z). | ||
| *13 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM (TERMINAL D) AND GROUND FOR CONTINUITY
CAUTION:
Is there continuity between ABS HU/CM terminal D and ground? |
Yes | If a communication error message is displayed on WDS or equivalent tester in Step 2 inspection, go to next step. If a communication error message is not displayed on WDS or equivalent tester in Step 2 inspection, recheck malfunction symptoms. |
| No | Repair wiring harness between ABS HU/CM (terminal D) and ground. | ||
| *14 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC (DATA LINK CONNECTOR) FOR CONTINUITY
CAUTION:
Is there continuity between ABS HU/CM terminal V and data link connector (DLC)? |
Yes | Go to next step. |
| No | Repair wiring harness between ABS HU/CM (Terminal V) and data link connector (DLC). | ||
| *15 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC (DATA LINK CONNECTOR) FOR SHORT TO B+
CAUTION:
Turn ignition switch to ON position. Is voltage approximately 12 V at ABS HU/CM terminal V? |
Yes | Repair wiring harness between ABS HU/CM (Terminal V) and data link connector (DLC). |
| No | Go to next step. | ||
| *16 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC (DATA LINK CONNECTOR) FOR SHORT TO GROUND
CAUTION:
Is there continuity between ABS HU/CM terminal V and ground? |
Yes | Repair wiring harness between ABS HU/CM (Terminal V) and data link connector (DLC). |
| No | Replace ABS HU/CM (communication circuit or ABS HU/CM power supply circuit malfunction in ABS HU/CM). | ||
| 17 | VERIFY THAT ABS HU/CM TERMINALS E AND F ARE CONNECTED Does malfunction symptom reoccur when ABS HU/CM terminals E and F are shaken while the ignition switch is at ON position? |
Yes | Securely connect ABS HU/CM terminals E and F, then go to next step. |
| No | Go to Step 18. | ||
| 18 | CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT REOCCUR AFTER ABS HU/CM TERMINALS E AND F ARE CONNECTED Do ABS warning light and BRAKE system warning light go out after more than 4 seconds with ignition switch to ON position? |
Yes | Temporary poor connection at terminal. Inspect ABS HU/CM connector and terminal. |
| No | Go to next step. | ||
| *19 | CHECK TO SEE WHETHER MALFUNCTION IS IN INSTRUMENT CLUSTER (SHORT TO GROUND) OR ELSEWHERE Disconnect all instrument cluster connectors. Is there continuity between instrument cluster terminals 1D or 3C and ground? |
Yes | If there is continuity between terminal 1D and ground: Go to next step. If there is continuity between terminal 3C and ground: Go to Step 21. |
| No | Replace instrument cluster (short to ground circuit in instrument cluster). | ||
| *20 | INSPECT WIRING HARNESS BETWEEN INSTRUMENT CLUSTER AND ABS HU/CM FOR SHORT TO GROUND Disconnect ABS HU/CM. Insert insulating material between ABS HU/CM terminals E and D so that the short bar cannot function. Is there continuity between instrument cluster terminal 1D and ground? |
Yes | Repair wiring harness between ABS HU/CM (Terminal E) and instrument cluster. |
| No | Replace ABS HU/CM (short to ground or B+ circuit in ABS HU/CM). | ||
| 21 | INSPECT WIRING HARNESS BETWEEN INSTRUMENT CLUSTER AND ABS HU/CM FOR SHORT TO GROUND Disconnect ABS HU/CM. Insert insulating material between ABS HU/CM terminals F and D so that the short bar cannot function. Is there continuity between instrument cluster terminal 3C and ground? |
Yes | Repair wiring harness between ABS HU/CM (Terminal F) and instrument cluster. |
| No | Replace ABS HU/CM (short to ground or B+ circuit in ABS HU/CM). | ||