Code No.26: Stop lamp switch system
OPERATION
- System voltage is supplied to the stop lamp switch (terminal
No.2).
- When the brake pedal is depressed, system voltage is applied to the
transfer-ECU (terminal No.34).
DIAGNOSIS CODE SET CONDITIONS
In the case that the stop lamp
switch is continuously turned ON for 15 minutes at the vehicle speed of 15
km/h and over, the code No.26 is set as the short circuit of the stop
lamp switch.
PROBABLE CAUSES
- Malfunction of the stop lamp switch circuit
- Damaged harness wires and connectors
- Malfunction of the transfer-ECU
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STEP 1. Check the brake pedal height.
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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 2.
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 Adjust
the brake pedal to the proper height.
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STEP 2. M.U.T.-III data list
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Item 23: Stop lamp switch (Refer to data list
reference table ).
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to
GROUP 00 - How to Cope with Intermittent Malfunction ).
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Go to Step 3.
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STEP 3. Measure the voltage at stop lamp switch connector
D-134.
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Disconnect the connector, and measure the
voltage between terminal No.2 and earth at the wiring harness
side.
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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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STEP 4. Connector check: D-134 stop lamp switch connector, D-241
intermediate connector.
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Check for the contact with terminals.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair
the defective connector.
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STEP 5. Check the harness between stop lamp switch connector D-134
terminal 2 and the battery.
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Check the power supply line for short or open
circuit.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair
the wiring harness.
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STEP 6. Measure the voltage at stop lamp switch connector
D-134.
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(1)Remove the stop lamp switch from the mounting
bracket.
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(2)Do not disconnect stop lamp switch connector
D-134.
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(3)Measure the voltage between stop lamp switch connector
D-134 terminal No.1 and earth.
OK:
- System voltage (When the stop lamp switch is depressed).
- 1 V or less (When the stop lamp switch is released).
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Q.
Is the check result normal?
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Go to Step 8.
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Go to Step 7.
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STEP 7. Check the stop lamp switch.
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Refer to GROUP 35A - Brake Pedal .
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Q.
Is the check result normal?
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Go to Step 8.
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Replace the stop lamp switch (Refer to
GROUP 35A - Brake Pedal ).
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STEP 8. Measure the voltage at transfer-ECU connector
D-123.
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(1)Install the stop lamp switch into the mounting bracket if
it was removed.
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(2)Measure the voltage between transfer-ECU connector D-123
terminal No.34 and earth.
OK:
- System voltage (When the brake pedal is depressed).
- 1 V or less (When the brake pedal is not depressed).
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Q.
Is the check result normal?
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Go to Step 11.
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Go to Step 9.
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STEP 9. Connector check: D-228 intermediate connector, D-123
transfer-ECU connector.
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Check for the contact with terminals.
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Q.
Is the check result normal?
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Go to Step 10.
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Repair
the defective connector.
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STEP 10. Check the harness between stop lamp switch connector D-134
terminal 1 and transfer-ECU connector D-123 terminal 34.
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Check the output line for short or open
circuit.
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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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Item 23: Stop lamp switch (Refer to data list
reference table ).
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to
GROUP 00 - How to Cope with Intermittent Malfunction ).
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Replace the PCM.
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