Code No.C1361: Abnormal pressure sensor characteristics
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If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Diagnose the CAN bus lines before the diagnosis codes (Refer to GROUP 54C - CAN Bus Diagnostics Table  .).
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OPERATION
DIAGNOSIS CODE SET CONDITIONS
- The output value of the pressure sensor does not change at the vehicle speed of 7 km/h or more when the brake pedal is depressed.
- When the vehicle drives at the speed of 40 km/h or more, the amount of the change of the pressure sensor output values during the time from the brake pedal depression to the vehicle stop is less than the specified value.
- The output value of the pressure sensor is abnormal.
PROBABLE CAUSES
- Damaged wiring harness or connector
- Malfunction of the hydraulic unit assembly (integrated with ASTC-ECU)
- Incorrect stop lamp switch installation or malfunction
- Residual brake fluid pressure
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STEP 1. M.U.T.-III CAN bus diagnostics.
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Use M.U.T.-III 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 Diagnostics Table .). Then go to Step 2.
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STEP 2. Check whether the diagnosis code is reset.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Check if the diagnosis code is set.
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(6)Turn the ignition switch to the "LOCK" (OFF) position.
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Go to Step 3.
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The procedure is complete.
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STEP 3. Check for stop lamp switch installation
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Refer to GROUP 35A - On-vehicle Service/Brake Pedal Check and Adjustment .
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Q.
Is the check result normal?
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Go to Step 4.
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Install the stop lamp switch correctly (Refer to GROUP 35A - On-vehicle Service/Brake Pedal Check and Adjustment .). Then go to Step 14
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STEP 4. M.U.T.-III data list
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Check the following data list (Refer to ).
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- Item No.13: Stop lamp switch
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 6.
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STEP 5. Check protrusion amount of the booster
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Refer to GROUP 35A - Master cylinder Assembly and Brake Booster Assembly <LHD>, <RHD>.
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Q.
Is the check result normal?
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Go to Step 13.
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Push rod protrusion amount adjustment (Refer to GROUP 35A - Master cylinder Assembly and Brake Booster Assembly <LHD>, <RHD>.). Then go to Step 14.
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STEP 6. Stop lamp and high-mount stop lamp operation check
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Check the stop lamp and high-mount stop lamp operation when the brake pedal is depressed. Check that the stop lamp and high-mount stop lamp illuminates when the brake pedal is depressed and that it goes out when the brake pedal is released.
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OK:
When the brake pedal is released: OFF
When the brake pedal is depressed: ON
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Q.
Is the check result normal?
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Go to Step 12.
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Go to Step 7.
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STEP 7. Connector check: C-114 stop lamp switch connector
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Q.
Is the check result normal?
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Go to Step 8.
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Repair or replace it, and go to Step 14.
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STEP 8. Connector check: A-48 ASTC-ECU connector, C-13,C-10 joint connector, C-30 intermediate connector, F-02 rear combination lamp (stop: RH) connector (with rear body), F-19 rear combination lamp (stop: RH) connector (without rear body), F-03 high mounted stop lamp connector (with rear body), F-04 rear combination lamp (stop: LH) connector (with rear body), F-23 rear combination lamp (stop: LH) connector (without rear body), F-07 intermediate connector
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Q.
Is the check result normal?
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Go to Step 9.
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Repair or replace it, and go to Step 14.
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STEP 9. Voltage measurement at C-114 stop lamp switch connector.
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(1)Remove C-114 stop lamp switch connector, and measure at the wiring harness connector side.
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(2)Measure the voltage between terminal No.2 and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 10.
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An open or short to power supply has occurred in the wiring harness between fusible link No.23 and C-114 stop lamp switch connector terminal No.2, and fuse No.12, therefore, repair it. Then go to Step 14.
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STEP 10. Resistance measurement at C-114 stop lamp switch connector.
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(1)Disconnect the A-48 ASTC-ECU connector, C-114 stop lamp switch connector, F-02 rear combination lamp (stop: RH) connector (with rear body), F-19 rear combination lamp (stop: RH) connector (without rear body), F-03 high mounted stop lamp connector (with rear body), F-04 rear combination lamp (stop: LH) connector (with rear body), F-23 rear combination lamp (stop: LH) connector (without rear body), and measure the voltage at C-114 stop lamp switch connector harness side.
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(2)Measure the resistance between terminal No.1 and body earth.
OK: No continuity
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Q.
Is the check result normal?
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Go to Step 11.
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A short to power supply has occurred in the wiring harness between C-114 stop lamp switch connector terminal No.1 and F-02 rear combination lamp (stop: RH) connector (with rear body) terminal No.2 or F-19 rear combination lamp (stop: RH) connector (without rear body) terminal No.4, or between C-114 stop lamp switch connector terminal No.1 and F-03 high mounted stop lamp connector (with rear body) terminal No.1, or between C-114 stop lamp switch connector terminal No.1 and F-04 rear combination lamp (stop: LH) connector (with rear body) terminal No.2 or F-23 rear combination lamp (stop: LH) connector (without rear body) terminal No.4, therefore, repair it.Then go to Step 14 .
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STEP 11. Resistance measurement at C-114 stop lamp switch connector and C-10 joint connector.
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(1)Disconnect the C-114 stop lamp switch connector and C-10 joint connector, and measure at the harness side.
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(2)Measure the resistance between C-114 stop lamp switch connector terminal No.1 and C-10 joint connector terminal No.7.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 13.
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Repair the wiring harness, and then go to Step 14.
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STEP 12. Voltage measurement at A-48 ASTC-ECU connector.
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(1)Disconnect the A-48 ASTC-ECU connector.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between terminal No.26 and body earth.
OK:
- When the brake pedal is released: 1 V or less
- When the brake pedal is depressed: System voltage
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Q.
Is the check result normal?
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Go to Step 13.
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An open circuit in signal line has occurred in the wiring harness between A-48 ASTC-ECU connector terminal No.26 and C-10 joint connector terminal No.1, therefore, repair it. Then go to Step 14.
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STEP 13. Check whether the diagnosis code is reset.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Check if the diagnosis code is set.
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(6)Turn the ignition switch to the "LOCK" (OFF) position.
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Replace the hydraulic unit assembly (integrated with ASTC-ECU). (Refer to .). Then go to Step 14.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions .).
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STEP 14. Check whether the diagnosis code is reset.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Check if the diagnosis code is set.
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(6)Turn the ignition switch to the "LOCK" (OFF) position.
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Go to Step 1.
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The procedure is complete.
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