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ABS-ECU monitors whether the stop lamp switch is "ON" or "OFF."
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This diagnosis code will be set if the vehicle speed is 15 km/h or more with the stop lamp switch "ON" continuously for 15 minutes or more.
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- Improper adjustment of stop lamp switch installation position
- Malfunction of the stop lamp switch
- Damaged wiring harness and connectors
- Malfunction of the ABS-ECU
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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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Repair the CAN bus lines. (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
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Erase the diagnosis code.
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Q.
Is the diagnosis code No.C1340 set?
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This diagnosis is complete.
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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 illuminate 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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Q.
Is the check result normal?
Go to Step 5
Repair or replace it, and go to Step 11.
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Refer to GROUP 35A - Brake Pedal - Stop Lamp Switch Check .
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Q.
Is the check result normal?
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Install the stop lamp switch correctly (Refer to GROUP 35A - Brake Pedal - Stop Lamp Switch Check ). Then go to Step 11.
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(1)Remove the stop lamp switch (Refer to GROUP 35A - Brake Pedal ).
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(2)Connect the circuit tester (Ω range) to the stop lamp switch connector terminals No.1 and No.2. (3)When no continuity is detected with the plunger pressed from the edge of the outer case by the dimension shown in the figure and when continuity is detected with the plunger released, the stop lamp switch is in good condition.
Q.
Is the check result normal?
Go to Step 7
Replace the stop lamp switch (Refer to GROUP 35A - Brake Pedal ). Then go to Step 11.
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Q.
Is the check result normal?
Go to Step 8
Repair or replace it, and go to Step 11.
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(1)Disconnect the A-01 ABS-ECU connector, and connect special tool ABS check harness (MB991952) to the wiring harness-side of the A-01 ABS-ECU connector.
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Do not connect special tool ABS check harness (MB991952) to the ABS-ECU.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between terminal No.3 and body earth. OK: 1 V or less
Q.
Is the check result normal?
Go to Step 9
A short to power supply has occurred in the wiring harness between A-01 ABS-ECU connector terminal No.3, C-10 joint connector terminal No.1 and C-13 intermediate connector terminal No.6 <LHD> or No.4 <RHD>, therefore, repair it.Then go to Step 11.
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(1)Disconnect the A-01 ABS-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. (2)Turn the ignition switch to the "ON" position. (3)Measure the voltage between terminal No.1 and body earth. OK: 1 V or less
Q.
Is the check result normal?
Go to Step 10
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 11 .
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Erase the diagnosis code.
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Q.
Is the diagnosis code No.C1340 set?
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Replace the hydraulic unit (integrated with ABS-ECU) (Refer to ). Then go to Step 11.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Erase the diagnosis code.
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Q.
Is the diagnosis code No.C1340 set?
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This diagnosis is complete.
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