Code No.61: Master Cylinder Pressure Sensor System
caution |
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 54D, CAN bus-line diagnostic flow ).
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![](../../../img/35/AC608370AA00ENG.png)
![](../../../img/35/AC607549AG00ENG.png)
![](../../../img/35/AC607552AF00ENG.png)
![](../../../img/35/AC607564BO00ENG.png)
![](../../../img/35/AC607571BO00ENG.png)
OPERATION
HBB, which is provided with the master cylinder pressure
sensor, converts the master cylinder pressure input from the brake pedal into
voltage value, and outputs it to ASTC-ECU.
DIAGNOSIS CODE SET CONDITIONS
Diagnosis code No. 61 is set in the
following cases;
- Abnormal rise or drop of input voltage
- Abnormal rise or drop of output voltage
- When the pressure value does not vary while the stop lamp switch signal
is ON.
- When the pressure value is output while the stop lamp switch signal is
OFF.
- When a steady pressure value is always output during driving.
PROBABLE CAUSES
The most likely causes for these diagnosis codes
to set are:
- Damaged wiring harness or connector
- Malfunction of the master cylinder pressure sensor
- Malfunction of the ASTC-ECU
- Incorrect adjustment of the stop lamp switch
- Malfunction of the stop lamp switch
- Malfunction of brake pedal
- Malfunction of the HBB
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STEP 1. M.U.T.-III CAN bus diagnostics
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caution |
Before connecting or disconnecting the M.U.T.-III,
turn the ignition switch to the "LOCK" (OFF) position.
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(1)Connect M.U.T.-III to the 16-pin diagnosis
connector.
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(2)Turn the ignition switch to the "ON" position.
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(3)Diagnose the CAN bus line.
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(4)Turn the ignition switch to the "LOCK" (OFF)
position.
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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 line (Refer to
GROUP 54D, CAN bus line Diagnostic flow ). Then go to Step 2.
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STEP 2. Check whether the diagnosis code is reset.
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caution |
Before connecting or disconnecting the M.U.T.-III,
turn the ignition switch to the "LOCK" (OFF) position.
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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)Disconnect the M.U.T.-III.
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(6)Drive the vehicle more than 60 seconds at the speed
exceeds 10 km/h. Stop the vehicle by braking from the speed exceeds 40
km/h.
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(7)Check if the diagnosis code is set.
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(8)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 master cylinder pressure sensor connector B-110 and
ASTC-ECU connector D-232 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair or replace the damaged
component(s). Then go to Step 13.
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STEP 4. Check the power supply circuit at pressure sensor connector
B-110.
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(1)Do not disconnect pressure sensor connector
B-110.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure voltage between terminal 2 and
earth. OK: Approximately 5 V
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Q.
Is the voltage approximately 5 volts?
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Go to Step 7.
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Go to Step 5.
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STEP 5. Check the ASTC-ECU connector D-232.
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(1)Disconnect the ASTC-ECU connector D-232, and measure at
the ASTC-ECU side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure voltage between terminal 50 and
earth. OK: Approximately 5 V
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Q.
Is the check result normal?
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Go to Step 6.
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Replace the ASTC-ECU. Then go to
Step 13.
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STEP 6. Check the harness wires between master cylinder pressure sensor
connector B-110 terminal 2 and ASTC-ECU connector D-232 terminal
50.
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Q.
Is the check result normal?
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Repair the wiring harness. Then
go to Step 13.
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It can
be assumed that this malfunction is intermittent. Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service Points - How to Cope
with Intermittent Malfunction .
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STEP 7. Check the earth circuit at pressure sensor connector
B-110.
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(1)Disconnect pressure sensor connector B-110, and measure at
the harness side.
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(2)Measure the resistance between terminal 3 and
earth. OK: Continuity exists (2 Ω or less)
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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 8.
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STEP 8. Check the ASTC-ECU connector D-232.
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(1)Disconnect the ASTC-ECU connector D-232, and measure at
the ASTC-ECU side.
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(2)Measure the resistance between terminal 49, 58 and
earth. OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 9.
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Replace the ASTC-ECU. Then go to
Step 13.
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STEP 9. Check the harness wires between master cylinder pressure sensor
connector B-110 terminal 3 and ASTC-ECU connector D-232 terminal 49 and
58.
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Q.
Is the check result normal?
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Repair the wiring harness. Then
go to Step 13.
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It can
be assumed that this malfunction is intermittent. Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service Points - How to Cope
with Intermittent Malfunction .
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STEP 10. Check the master cylinder pressure sensor connector
B-110.
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(1)Disconnect the master cylinder pressure sensor connector
B-110, and measure at the master cylinder pressure sensor side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure voltage between terminal 1 and
earth. OK: 0.14 - 4.85 V
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Q.
Is the check result normal?
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Go to Step 11.
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Replace the HBB. Then go to Step
13.
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STEP 11. Check the ASTC-ECU connector D-232.
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(1)Disconnect the ASTC-ECU connector D-232, and measure at
the harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure voltage between terminal 59 and
earth. OK: 0.14 - 4.85 V
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Q.
Is the check result normal?
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Replace the ASTC-ECU. Then go to
Step 13.
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Go to Step 12.
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STEP 12. Check the harness wires between master cylinder pressure
sensor connector B-110 terminal 2 and ASTC-ECU connector D-232 terminal
50.
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Q.
Is the check result normal?
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Repair the wiring harness. Then
go to Step 13.
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It can
be assumed that this malfunction is intermittent. Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service Points - How to Cope
with Intermittent Malfunction .
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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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Repeat the troubleshooting from
Step 1.
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The
procedure is complete.
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