Code No.C1340:
Stop lamp switch
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- 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
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- Before replacing the ECU, ensure that the communication circuit is normal.
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OPERATION
ABS-ECU monitors whether the stop lamp switch is "ON" or "OFF".
DIAGNOSIS CODE SET CONDITIONS
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.
PROBABLE CAUSES
- 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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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 - Troubleshooting ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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(1)Drive the vehicle at 15 km/h or more.
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(2)Turn the ignition switch from the "ON" position to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No.C1340 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. 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 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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Go to Step 7.
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Go to Step 4.
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STEP 4. Check for stop lamp switch installation
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Refer to GROUP 35A - Brake Pedal Check and Adjustment .
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Q.
Is the check result normal?
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Go to Step 5.
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Install the stop lamp switch correctly (Refer to GROUP 35A - Brake Pedal
Check and Adjustment ). Then go to Step 8.
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STEP 5. Stop lamp switch continuity check
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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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Go to Step 6.
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Replace the stop lamp switch (Refer to GROUP 35A - Brake Pedal <LHD> or <RHD>). Then
go to Step 8.
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STEP 6. Voltage measurement at ETACS-ECU connector.
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(1)Connector check: ETACS-ECU connector, stop lamp switch connector
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between terminal stop lamp line and body earth.
OK:
When the brake pedal is released: 1V or less
When the brake pedal is depressed: Approximately system voltage
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Q.
Is the check result normal?
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Go to Step 7.
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A short or open to power supply has occurred in the wiring harness between ETACS-ECU
connector and stop lamp switch connector, therefore, repair it. Then go to Step 8.
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STEP 7. Diagnosis code recheck
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(1)Drive the vehicle at 15 km/h or more.
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(2)Turn the ignition switch from the "ON" position to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No.C1340 set?
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Replace the hydraulic unit [(integrated with ABS-ECU) Refer to ].
Then go to Step 8.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
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STEP 8. Diagnosis code recheck
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(1)Drive the vehicle at 15 km/h or more.
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(2)Turn the ignition switch from the "ON" position to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No.C1340 set?
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Return to Step 1.
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This diagnosis is complete.
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