Code No.C2101 Abnormality in battery voltage (high voltage)
|
|
| caution |
- If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, Trouble code diagnosis
 ).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to , and ).
|
|
|
|
When the power is supplied from the ignition switch (IG1) to the IG1 relay in ETACS-ECU, IG1 relay is turned on. At this time, the ASC-ECU power supply signal is sent to ASC-ECU (terminal No.8 and No.2) from the fusible link No.34 through the multi-purpose fuse No.12 and fuse No.17.
|
|
|
DIAGNOSIS CODE SET CONDITIONS
|
|
|
This diagnosis code is set when the ASC-ECU power supply voltage is more than 18.0 ± 1.0 V.
|
|
|
- Battery failure
- Fusible link malfunction
- Damaged wiring harness and connectors
- ASC-ECU malfunction
- Charging system failed
|
|
|
STEP 1. M.U.T.-III CAN bus diagnostics
|
|
|
Use M.U.T.-III to diagnose the CAN bus lines.
|
|
|
Q.
Is the check result normal?
|
|
|
 Go to Step 3.
|
|
|
|
|
|
 Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnosis table ). On completion, go to Step 2.
|
|
|
|
|
|
STEP 2. Diagnosis code recheck after resetting CAN bus lines
|
|
|
Q.
Is diagnosis code No.C2101 set?
|
|
|
Go to Step 3.
|
|
|
|
|
|
This diagnosis is complete.
|
|
|
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 4.
|
|
|
|
|
|
NO  : Replace the fuse, and then go to Step 19.
|
|
|
|
|
|
STEP 4. Check fusible link No. 34.
|
|
|
Visually check for open circuit in fusible link No.34.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 5.
|
|
|
|
|
|
Replace fusible link No.34, and then go to Step 19.
|
|
|
|
|
|
Refer to GROUP 54A - Battery Test .
|
|
|
Q.
Is the battery in good condition?
|
|
|
Go to Step 6.
|
|
|
|
|
|
Charge or replace the battery, and then go to Step 19.
|
|
|
|
|
|
STEP 6. Charging system check
|
|
|
Refer to GROUP 16 - Charging System .
|
|
|
Q.
Is the charging system in good condition?
|
|
|
Go to Step 7.
|
|
|
|
|
|
Repair or replace the charging system component(s), and then go to Step 19.
|
|
|
|
|
|
STEP 7. Connector check: C-317 ETACS-ECU connector
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 8.
|
|
|
|
|
|
NO : Repair the defective connector, and then go to Step 19.
|
|
|
|
|
|
STEP 8. Voltage measurement at the C-317 ETACS-ECU connector
|
|
|
(1)Disconnect the ETACS-ECU connector, and then measure the voltage at the connector side.
|
|
|
(2)Turn the ignition switch to the ON position.
|
|
|
(3)Measure the voltage between terminal No.6 and body earth.
OK: Approximately battery voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 9.
|
|
|
|
|
|
The open circuit may be present in the power supply circuit. Repair the wiring harness between the C-317 ETACS-ECU connector terminal No.6 and the ignition switch (IG1).
|
|
|
|
|
|
STEP 9. Connector check: A-58 ASC-ECU connector, C-309 ETACS-ECU connector and C-128 intermediate connector
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 10.
|
|
|
|
|
|
NO : Repair the defective connector, and then go to Step 19.
|
|
|
|
|
|
STEP 10. Voltage measurement at the C-309 ETACS-ECU connector
|
|
|
(1)Disconnect the ETACS-ECU connector, and then measure the voltage at the connector side.
|
|
|
(2)Measure the voltage between terminal No.1 and body earth.
OK: Approximately battery voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 11.
|
|
|
|
|
|
The open circuit may be present in the power supply circuit. Repair the wiring harness between the C-309 ETACS-ECU connector terminal No.1 and the fusible link No.34.
|
|
|
|
|
|
STEP 11. Fuse No.12 check
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 12.
|
|
|
|
|
|
NO : Replace the fuse, and then go to Step 19.
|
|
|
|
|
|
STEP 12. Voltage measurement at the C-317 ETACS-ECU connector
|
|
|
(1)Do not disconnect the ETACS-ECU connector.
|
|
|
(2)Turn the ignition switch to the ON position.
|
|
|
(3)Measure the voltage between terminal No.5 and body earth for the backprobing.
OK: Approximately battery voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 13.
|
|
|
|
|
|
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ), and then go to Step 19.
|
|
|
|
|
|
STEP 13. Voltage measurement at the A-58 ASC-ECU connector
|
|
(1)Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the voltage at the special tool connector side.
| note |
Do not connect the special tool ASC check harness (MB991997) to ASC-ECU.
|
(2)Turn the ignition switch to the ON position.
(3)Measure the voltage between terminal No.8 and body earth.
OK: Approximately battery voltage
Q.
Is the check result normal?
Go to Step 14.
The open circuit may be present in the power supply circuit. Repair the wiring harness between the A-58 ASC-ECU connector terminal No.8 and the ETACS-ECU connector terminal No.5.
|
|
|
STEP 14. Fuse No.17 check
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 15.
|
|
|
|
|
|
NO : Replace the fuse, and then go to Step 19.
|
|
|
|
|
|
STEP 15. Voltage measurement at the C-315 ETACS-ECU connector
|
|
|
(1)Do not disconnect the ETACS-ECU connector.
|
|
|
(2)Turn the ignition switch to the ON position.
|
|
|
(3)Measure the voltage between terminal No.4 and body earth for the backprobing.
OK: Approximately battery voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 16.
|
|
|
|
|
|
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ), and then go to Step 19.
|
|
|
|
|
|
STEP 16. Voltage measurement at the A-58 ASC-ECU connector
|
|
(1)Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the voltage at the special tool connector side.
| note |
Do not connect the special tool ASC check harness (MB991997) to ASC-ECU.
|
(2)Measure the voltage between terminal No.2 and body earth.
OK: Approximately battery voltage
Q.
Is the check result normal?
Go to Step 17.
The open circuit may be present in the power supply circuit. Repair the wiring harness between the A-58 ASC-ECU connector terminal No.2 and the ETACS-ECU connector terminal No.4.
|
|
|
STEP 17. Measure the resistance at A-58 ASC-ECU connector.
|
|
(1)Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side.
| note |
Do not connect the special tool to ASC-ECU.
|
(2)Measure the resistance between terminal No.16 and body earth and between terminal No.47 and body earth.
OK: Continuity exists (2 Ω or less)
Q.
Is the check result normal?
Go to Step 18.
An open circuit may be present in the earth circuit. Repair the wiring harness between A-58 ASC-ECU connector terminal No.16 and body earth and between A-58 ASC-ECU connector terminal No.47 and body earth.
|
|
|
STEP 18. Check whether the diagnosis code is reset.
|
|
|
Q.
Is diagnosis code No.C2101 set?
|
|
|
Replace the ASC-ECU (Refer to ). Then go to Step 19.
|
|
|
|
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
|
|
|
|
|
|
STEP 19. Check whether the diagnosis code is reset.
|
|
|
Q.
Is diagnosis code No.C2101 set?
|
|
|
Return to Step 1.
|
|
|
|
|
|
This diagnosis is complete.
|
|
|
|
)
)
)
)
)
)
)