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Inspection Procedure 5: Auto-Cruise Control cannot be Set.
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COMMENTS ON TROUBLE SYMPTOM
The cause is probably that the fail-safe function is cancelling auto-cruise control. In this case, the MUT-II/III can be used to check the trouble symptoms in each system by inspecting the diagnosis codes. The MUT-II/III can also be used to check if the circuits of each input switch are normal or not by inspecting the input switch codes.
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PROBABLE CAUSES
- Malfunction of the connector.
- Malfunction of the harness.
- Malfunction of the auto-cruise control switch.
- Malfunction of the stop lamp switch.
- Malfunction of the inhibitor switch.
- Malfunction of the auto-cruise control-ECU.
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STEP 1. Check the auto-cruise control-ECU communicate with the MUT-II/III. Q: Can the auto-cruise control-ECU communicate with the MUT-II/III?
YES:
Go to Step 2  .
NO:
Inspect for each trouble symptom (Refer to inspection procedure 1  ). Then go to Step 7 .
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STEP 2. MUT-II/III diagnosis code. Q: Are any of MUT-II/III diagnosis code set?
YES:
Repair the fault, which the MUT-II/III diagnosis code indicates (Refer to diagnosis codes chart ). Then go to Step 7 .
NO:
Go to Step 3 .
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STEP 3. MUT-II/III data list.
Check MUT-II/III data list item 04: Auto-cruise control CANCEL switch (Refer to ).
Q: Is the check result normal?
YES:
Go to Step 4 .
NO:
Inspect for each trouble symptom (Refer to inspection diagnosis code No.15 ). Then go to Step 7 .
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STEP 4. MUT-II/III data list.
Check MUT-II/III data list item 05: Stop lamp switch (Refer to ).
Q: Is the check result normal?
YES:
Go to Step 5 .
NO:
Inspect for each trouble symptom (Refer to inspection procedure 2 ). Then go to Step 7 .
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STEP 5. MUT-II/III data list.
Check MUT-II/III data list item 14: Inhibitor switch. (Refer to ).
Q: Is the check result normal?
YES:
Go to Step 6 .
NO:
Inspect for each trouble symptom (Refer to inspection procedure 3 ). Then go to Step 7 .
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STEP 6. Retest the system. Q: Does a malfunction take place again?
YES:
Replace the auto-cruise control-ECU (Refer to ). Then go to Step 7 .
NO:
This malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).
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STEP 7. Retest the system. Q: Does a malfunction take place again?
YES:
Return to Step 1 .
NO:
This malfunction is eliminated.
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