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DTC C1009 Low
brake fluid level
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- If there is
any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose
the CAN bus lines (Refer to GROUP 54C - Diagnostic trouble code diagnosis
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- 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 ).
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ASC-ECU receives the OFF signal of the brake fluid level switch in ETACS-ECU via the CAN
bus lines. This indicates that the brake fluid level is lower than the specified.
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This DTC is set when the brake fluid level is lower than the specified.
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- Low brake fluid level
- Brake fluid level switch malfunction
- Brake pad wear
- Damaged wiring harness and connectors
- Malfunction of ETACS-ECU
- ASC-ECU malfunction
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Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use scan tool to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostic table ).
On completion, go to Step 2.
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STEP 2. DTC recheck after resetting CAN bus lines
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Go to Step 3.
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The procedure is complete.
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STEP 3. Brake fluid level check
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Check that the brake fluid level is higher than the lower limit.
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 4.
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Check that the brake pad is thicker than the limit (Refer to GROUP 35A - On-vehicle
Service, Brake Pad Check ).
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Q.
Is the check result normal?
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Go to Step 5.
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Replace the brake pad <Refer to GROUP 35A - On-vehicle Service, Brake
Pad Replacement (Except RALLIART), (RALLIART)>,
and then add brake fluid as necessary. Then go to Step 13.
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STEP 5. Brake fluid leak check
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Check that the brake fluid is not leaking from the hydraulic unit (incorporated in ASC-ECU),
brake caliper, brake hose, brake tube, or master cylinder assembly.
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Q.
Is the check result normal?
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Fill the brake fluid up to the "MAX" level. Then go to Step 13.
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Repair the brake fluid leak area. Then go to Step 13.
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STEP 6. Brake fluid level switch check
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Refer to GROUP 35A - On-vehicle service .
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Q.
Is the check result normal?
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Go to Step 7.
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Replace the reservoir assembly <Refer to GROUP 35A - Master Cylinder
Assembly and Brake Booster (Except RALLIART), (RALLIART)>.
Then go to Step 13.
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STEP 7. Connector check: A-06 brake fluid level switch connector,
C-312 ETACS-ECU connector
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Q.
Is the check result normal?
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Go to Step 8.
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Repair the damaged connector.
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STEP 8. Voltage measurement at A-06 brake fluid level switch connector
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between the terminal No.1 and the body ground.
OK: Approximately 5 V
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Q.
Is the check result normal?
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Go to Step 10.
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Go to Step 9.
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STEP 9. Voltage measurement at C-312 ETACS-ECU connector
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| caution |
With the C-312 ETACS-ECU connector kept connected, disconnect
the A-07 brake fluid level switch connector.
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(1)Turn the ignition switch to the ON position.
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(2)Measure the voltage between the terminal No.1 and the body ground to the back probing.
OK: Approximately 5 V
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Q.
Is the check result normal?
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Repair the wiring harness between the C-312 ETACS-ECU connector terminal No.1
and the A-06 brake fluid level switch connector terminal No.1.
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Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ), and
then go to Step 13.
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STEP 10. Harness check: Between A-06 brake fluid level switch connector
and the body ground
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Check the wiring harness for open circuit between the A-06 brake fluid level switch connector
terminal No.2 and the body ground.
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Q.
Is the check result normal?
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Go to Step 11.
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Repair the wiring harness.
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STEP 11. M.U.T.-III data list
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Check the following service data (Refer to ).
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- Item 26: Brake fluid level switch
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Q.
Is the check result normal?
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Go to Step 12.
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Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ), and
then go to Step 13.
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STEP 12. Check whether the DTC is reset.
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(2)Ignition switch "LOCK" (OFF)
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Replace the hydraulic unit (ASC-ECU) (Refer to ). Then
go to Step 13.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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STEP 13. Check whether the DTC is reset.
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(2)Ignition switch "LOCK" (OFF)
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Return to Step 1.
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The procedure is complete.
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