Code No. P0703: Malfunction of Stop Lamp Switch
DIAGNOSTIC FUNCTION
JUDGEMENT CRITERIA
PROBABLE CAUSES
- Malfunction of the CAN bus
- Malfunction of the stop lamp switch
- Damaged wiring harness and connectors
- Malfunction of CVT-ECU
- Malfunction of ETACS-ECU
DIAGNOSTIC PROCEDURE |
STEP 1. M.U.T.-III CAN bus diagnostics |
| Use M.U.T.-III to perform the CAN bus diagnosis. |
Q.
Is the check result normal?
|
 Go to Step 2. |
|
 Repair the CAN bus lines (Refer to GROUP 54C, Troubleshooting - Diagnosis Code Chart  ). |
|
STEP 2. M.U.T.-III data list |
| Item 50: Brake switch |
| OK: The service data changes in response to the brake operation. |
Q.
Is the check result normal?
|
| Intermittent malfunction |
|
| Go to Step 3. |
|
STEP 3. Check the following connector: |
|
| Check the contact status of the terminals. |
Q.
Is the check result normal?
|
| Go to Step 4. |
|
| Repair the defective connector. |
|
STEP 4. Stoplamp Switch Check |
| Refer to GROUP 35A, Brake Pedal . |
Q.
Is the check result normal?
|
| Go to Step 5. |
|
| Replace the stoplamp switch. |
|
STEP 5. Check for open circuit in the wiring harness between the stoplamp switch connector and the ETACS-ECU connector. |
| Between C-24 Stoplamp switch connector (terminal No.2) and C-304 ETACS-ECU harness-side connector (terminal No.1) |
Q.
Is the check result normal?
|
| Go to Step 6. |
|
| Repair the wiring harness. |
|
STEP 6. Check for open circuit or short to earth in wiring harness between the ETACS-ECU connector and the joint connector (4) |
| Between C-312 ETACS-ECU harness-side connector (terminal No.16) and C-30 joint connector (4) (terminal No.2) |
Q.
Is the check result normal?
|
| Go to Step 7. |
|
| Repair the wiring harness. |
|
STEP 7. Symptom recheck after erasing diagnosis code |
Q.
Is the check result normal?
|
| Intermittent malfunction |
|
| Replace the ETACS-ECU, and then go to Step 8. |
|
STEP 8. Symptom recheck after erasing diagnosis code |
Q.
Is the check result normal?
|
| Intermittent malfunction |
|
| Replace CVT-ECU. |
|