Code No. C200A: Brake electric vacuum pump main relay coil (VP)
BRAKE VACUUM GENERATION SYSTEM CIRCUIT
OPERATION
DIAGNOSIS CODE SET CONDITIONS
- After the electric motor switch is set to the ON position,
if the low voltage level of the excitation coil monitor for the brake electric vacuum pump main
relay continues before the brake electric vacuum pump main relay is set to on, the diagnosis
code No. C200A will be set.
- While the brake electric vacuum pump main relay is set to on, if the high voltage level
of the excitation coil monitor for the brake electric vacuum pump main relay continues, the diagnosis
code No. C200A will be set.
PROBABLE CAUSES
- Malfunction of the brake electric vacuum pump main relay
- Malfunction of the brake electric vacuum pump relay box
- Damaged wiring harness or connector(s)
- Malfunction of the EV-ECU
DIAGNOSIS PROCEDURE |
STEP 1. Measure the voltage at A-103X brake electric vacuum pump main relay (brake electric vacuum pump relay box) connector. |
| (1)Remove the brake electric vacuum pump main relay, and measure the voltage at the
wiring harness side. |
| (2)Turn the electric motor switch to the "ON" position. |
| (3)Measure the voltage between the A-103X brake electric vacuum pump main relay (brake
electric vacuum pump relay box) connector terminal No. 3 and the body earth. OK: Battery voltage |
Q.
Is the check result normal?
|
 Go to Step 5. |
|
 Go to Step 2. |
|
STEP 2. Connector check: A-103X brake electric vacuum pump main relay (brake electric vacuum pump relay box) connector |
Q.
Is the check result normal?
|
| Go to Step 3. |
|
| Correct and replace the brake electric vacuum pump relay box. Replace the brake
electric vacuum pump. |
|
STEP 3. Connector check: A-104 brake electric vacuum pump relay box connector |
Q.
Is the check result normal?
|
| Go to Step 4. |
|
| Correct and replace the brake electric vacuum pump relay box. Replace the brake
electric vacuum pump. |
|
STEP 4. Check the wiring harness between A-08X EV control relay (relay box) connector terminal No. 1 and A-104 brake electric vacuum pump relay box connector terminal No. 1. |
| Check the power supply line for open circuit. |
Q.
Is the check result normal?
|
| Go to Step 5. |
|
| Correct and replace the brake electric vacuum pump relay box. Replace the brake
electric vacuum pump. |
|
STEP 5. Brake electric vacuum pump main relay check |
Check the brake electric vacuum pump main relay. (Refer to GROUP 35A - On-vehicle
Service - Relay Check  .) |
Q.
Is the check result normal?
|
| Go to Step 6. |
|
| Replace the brake electric vacuum pump main relay. |
|
STEP 6. Connector check: A-103X brake electric vacuum pump main relay (brake electric vacuum pump relay box) connector |
Q.
Is the check result normal?
|
| Go to Step 7. |
|
| Correct and replace the brake electric vacuum pump relay box. Replace the brake
electric vacuum pump. |
|
STEP 7. Connector check: C-106 EV-ECU connector, B-28 intermediate connector, A-104 brake electric vacuum pump relay box connecter |
Q.
Is the check result normal?
|
| Go to Step 8. |
|
| Repair the damaged connector. Or, correct and replace the brake electric vacuum
pump relay box. Replace the brake electric vacuum pump. |
|
STEP 8. Check the wiring harness between A-104 brake electric vacuum pump relay box connector terminal No. 3 and C-106 EV-ECU connector terminal No. 19. |
| Check the signal lines for open circuit and short to earth. |
Q.
Is the check result normal?
|
| Go to Step 9. |
|
| Repair the wiring harness. Or, correct and replace the brake electric vacuum pump
relay box. Replace the brake electric vacuum pump. |
|
STEP 9. Diagnosis code recheck |
| Check again if the diagnosis code is set to the EV-ECU. |
| (1)Erase the stored diagnosis code. |
| (2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position. |
| (3)Check if the diagnosis code is set. |
Q.
Is the diagnosis code set?
|
| Replace the EV-ECU. (Refer to .) Then go to Step
10. |
|
| Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction .) |
|
STEP 10. Diagnosis code recheck |
| Check again if the diagnosis code is set to the EV-ECU. |
| (1)Erase the stored diagnosis code. |
| (2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position. |
| (3)Check if the diagnosis code is set. |
Q.
Is the diagnosis code set?
|
| Return to Step 1. |
|
| The diagnosis is complete. |
|