Code No.22 Stop Lamp Switch System
OPERATION
- Battery positive voltage is supplied to the stop lamp switch
(terminal 2 and 4).
- When the brake pedal is depressed, battery positive voltage is
applied to the engine-A/T-ECU (terminal 39 and 54).
DIAGNOSIS CODE SET CONDITIONS
Check Condition
- The "CRUISE" indicator light illuminates.
Judgement Criteria
- Short in stop lamp switch circuit.
- Open circuit in the brake switch circuit (between engine-A/T-ECU
terminal 54 and earth).
POSSIBLE CAUSES
- Malfunction of the stop lamp switch.
- Damaged harness or connector.
- Malfunction of the engine-A/T-ECU.
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STEP 1. M.U.T.-III data list
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Item 05: Stop lamp switch (Refer to
data list reference table  ).
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Q.
Is the check result normal?
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 Go to Step
14.
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 Go to Step
2.
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STEP 2. Check the stop lamp operation.
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(1)Check the stop lamp
operation.
OK:
Brake pedal
depressed: Stop lamp will illuminate
Brake pedal not
depressed: Stop lamp does not
illuminate
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Q.
Is the check result normal?
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Go to Step
3.
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Go to Step
6.
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STEP 3. Measure the voltage at engine-A/T-ECU connector
C-111.
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(1)Turn the ignition switch to the "ON"
position.
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(2)Measure the voltage between
engine-A/T-ECU connector C-111 terminal No.39 and
earth.
OK:
Brake pedal
depressed: System voltage
Brake pedal not
depressed: 1 V or less
(3)Turn the
ignition switch to the "LOCK" (OFF) position.
Q.
Is the check result normal?
Go to Step
13.
Go to Step
4.
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STEP 4. Connectors check: C-111 engine-A/T-ECU
connector, C-18 intermediate connector
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Q.
Is the check result normal?
Go to Step
5.
Repair or
replace the damaged components. Then go to Step
23.
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STEP 5. Check the harness between engine-A/T-ECU
connector C-111 terminal No.39 and stop lamp switch
connector C-127 terminal No.1.
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Q.
Is the check result normal?
Go to Step
13.
Repair the
damaged harness wire. Then go to Step 23.
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STEP 6. Measure the voltage at stop lamp switch
connector C-127.
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(1)Disconnect stop lamp switch
connector C-127.
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(2)Measure the voltage between stop
lamp switch connector C-127 terminal No.2 and
earth.
OK: System voltage
(3)Connect
stop lamp switch connector C-127.
Q.
Is the check result normal?
Go to Step
10.
Go to Step
7.
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STEP 7. Connectors check: C-127 stop lamp switch
connector, C-125 intermediate connector
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Q.
Is the check result normal?
Go to Step
8.
Repair or
replace the damaged components. Then go to Step
23.
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STEP 8. Check the harness between stop lamp switch
connector C-127 terminal No.2 and fuse No.11 at the
relay box in engine compartment for
damage.
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Q.
Is the check result normal?
Go to Step
9.
Repair the
damaged harness wire. Then go to Step 23.
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STEP 9. Check the fuse No.11 at the relay box in engine
compartment.
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Q.
Is the check result normal?
Go to Step
10.
Check the
stop lamp system harness and replace the fuse. Then go to
Step 23.
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STEP 10. Check the stop lamp switch.
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(1)Remove the stop lamp switch (Refer to GROUP 35A,
Brake Pedal ).
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(2)Connect an ohmmeter to the stop
lamp switch between terminals 1 and 2.
(3)Check for
continuity between the terminals when the plunger of the
stop lamp switch is pushed in and when it is
released.
OK: The stop lamp switch is operating
properly if the circuit is open between terminals 1 and
2 when the plunger is pushed in to a depth of within 4.0
mm from the outer case edge surface, and if the
resistance value is less than 2 Ω between
terminals 1 and 2 when it is released.
Q.
Is the check result normal?
Install the
stop lamp switch (Refer to GROUP 35A, Brake Pedal ). Then go
to Step 11.
Replace the
stop lamp switch (Refer to GROUP 35A, Brake Pedal ). Then go
to Step 23.
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STEP 11. Connectors check: C-127 stop lamp switch
connector, C-18 intermediate connector
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Q.
Is the check result normal?
Go to Step
12.
Repair or
replace the damaged components. Then go to Step
23.
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STEP 12. Check the harness between stop lamp switch
connector C-127 terminal No.1 and intermediate connector
C-18 terminal No.4.
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Q.
Is the check result normal?
Go to Step
13.
Repair the
damaged harness wire. Then go to Step 23.
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STEP 13. M.U.T.-III data list
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Item 05: Stop lamp switch (Refer to
data list reference table ).
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Q.
Is the check result normal?
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Go to Step
22.
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Replace the
engine-A/T-ECU (Refer to GROUP 13A, Engine-ECU and
Engine-A/T-ECU ). Then go
to Step 23 .
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STEP 14. M.U.T.-III data list
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Item 06: Brake switch (Refer to
data list reference table ).
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Q.
Is the check result normal?
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Go to Step
22.
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Go to Step
15.
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STEP 15. Measure the voltage at engine-A/T-ECU connector
C-111.
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(1)Turn the ignition switch to the "ON"
position.
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(2)Measure the voltage between
engine-A/T-ECU connector C-111 terminal No.54 and
earth.
OK:
Brake pedal
depressed: System voltage
Brake pedal not
depressed: 1 V or less
(3)Turn the
ignition switch to the "LOCK" (OFF) position.
Q.
Is the check result normal?
Go to Step
21.
Go to Step
16.
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STEP 16. Check the stop lamp switch.
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(1)Remove the stop lamp switch (Refer to GROUP 35A,
Brake Pedal ).
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(2)Connect an ohmmeter to the stop
lamp switch between terminals 3 and 4.
(3)Check for
continuity between the terminals when the plunger of the
stop lamp switch is pushed in and when it is
released.
OK: The stop lamp switch is operating
properly if the circuit is open between terminals 3 and
4 when the plunger is released, and if resistance value
is less than 2 Ω between terminals 3 and 4 when
the plunger is pushed in to a depth of within 4.5 mm
from the outer case edge surface.
Q.
Is the check result normal?
Install the
stop lamp switch (Refer to GROUP 35A, Brake Pedal ). Then go
to Step 17.
Replace the
stop lamp switch (Refer to GROUP 35A, Brake Pedal ). Then go
to Step 23.
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STEP 17. Connectors check: C-111 engine-A/T-ECU
connector, C-17 intermediate connector, C-127 stop lamp
switch connector
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Q.
Is the check result normal?
Go to Step
18.
Repair or
replace the damaged components. Then go to Step
23.
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STEP 18. Check the harness between engine-A/T-ECU
connector C-111 terminal No.54 and stop lamp switch
connector C-127 terminal No.4.
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Q.
Is the check result normal?
Go to Step
19.
Repair the
damaged harness wire. Then go to Step 23.
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STEP 19. Connectors check: C-127 stop lamp switch
connector, C-01 J/C (6)
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Q.
Is the check result normal?
Go to Step
20.
Repair or
replace the damaged components. Then go to Step
23.
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STEP 20. Check the harness between stop lamp switch
connector C-127 terminal No.3 and earth.
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Q.
Is the check result normal?
Go to Step
21.
Repair the
damaged harness wire. Then go to Step 23.
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STEP 21. M.U.T.-III data list
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Item 06: Brake switch (Refer to
data list reference table ).
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Q.
Is the check result normal?
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Go to Step
22.
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Replace the
engine-A/T-ECU (Refer to GROUP 13A, Engine-ECU and
Engine-A/T-ECU ). Then go
to Step 23 .
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STEP 22. Check the M.U.T.-III diagnosis code No.
22.
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Q.
Is the M.U.T.-III diagnosis code No. 22 output?
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Replace the
engine-A/T-ECU (Refer to GROUP 13A, Engine-ECU and
Engine-A/T-ECU ). Then go
to Step 23 .
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It can be assumed
that this malfunction is intermittent.
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STEP 23. Check the M.U.T.-III diagnosis code No.
22.
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Q.
Is the M.U.T.-III diagnosis code No. 22 output?
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Return to
Step 1.
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The procedure is
complete.
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