Inspection Procedure 9: After start-up of the engine, the ASC OFF switch
cannot be operated (ASC is fixed in the OFF position or cannot be turned
OFF).
OPERATION
- The active stability control system can be turned OFF by pressing the ASC
OFF switch for 3 seconds or more with the ignition switch "ON" (after
start-up of the engine).
- When the ASC OFF switch is pressed and held for 15 seconds or more with
the ignition switch "ON" (after start-up of the engine), ASTC-ECU judges it
as an operation error of the ASC OFF switch and keeps the active stability
control system in ON state until the ignition switch is turned ON next
time.
COMMENT ON TROUBLE SYMPTOM
ASTC-ECU failure or the ASC OFF switch
circuit failure is suspected.
PROBABLE CAUSES
The most likely causes for this case
are:
- Damaged wiring harness or connector
- Malfunction of the ASC OFF switch
- Malfunction of the ASTC-ECU
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STEP 1. Check the ASC OFF switch
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Refer to  .
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Q.
Is the check result normal?
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 Go to Step 2.
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 Replace the ASC OFF switch. Then
go to Step 7.
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STEP 2. Connector check: D-203 ASC OFF switch connector, D-233 ASTC-ECU
connector and D-230 intermediate connector.
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Q.
Is the check result normal?
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Go to Step 3.
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Repair the defective connector.
Then go to Step 7.
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STEP 3. Voltage measurement at ASTC-ECU connector D-233.
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(1)Do not disconnect ASTC-ECU connector D-233, and check at
the harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between terminal 13 and
earth.
OK:
<When the ASC OFF switch is
pressed>: Approximately 5 V
<When the ASC OFF switch is not
pressed>: 0 V
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Q.
Is the check result normal?
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Replace the ASTC-ECU. Then go to
Step 7.
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Go to Step 4.
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STEP 4. Check the harness wire between the ASC OFF switch connector
D-203 terminal 2 and ASTC-ECU connector D-233 terminal 13.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the harness wire. Then go
to Step 7.
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STEP 5. Check the harness wire between the ASC OFF switch connector
D-203 terminal 1 and ASTC-ECU connector D-233 terminal 17.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the harness wire. Then go
to Step 7.
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STEP 6. Retest the system.
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Q.
Can you operate the ASC OFF switch normally?
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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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Repair the ASTC-ECU. Then go to
Step 7.
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STEP 7. Retest the system.
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Q.
Can you operate the ASC OFF switch normally?
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The
procedure is complete.
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Start over at Step 1.
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