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Inspection Procedure 1: Communication with MUT-II/III is not Possible (Communication with Auto-Cruise Control-ECU only is not Possible).
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COMMENTS ON TROUBLE SYMPTOM
One of the following causes may be suspected.
- No power supply to the auto-cruise control-ECU.
- Defective earth circuit of the auto-cruise control-ECU.
- Defective the auto-cruise control-ECU.
- Improper communication line between the auto-cruise control-ECU and MUT-II/III.
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PROBABLE CAUSES
- Malfunction of the connector.
- Malfunction of the harness.
- Malfunction of the auto-cruise control-ECU.
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STEP 1. Measure at auto-cruise control-ECU connector C-113.
Disconnect auto-cruise control-ECU connector C-113 and measure at the harness side.
- Voltage between terminal 6 and body earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 4  .
NO:
Go to Step 2 .
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STEP 2. Check auto-cruise control-ECU connector C-113, junction block connector C-205 and intermediate connector C-106 <R.H. drive vehicles only>. Q: Is the check result normal?
YES:
Go to Step 3 .
NO:
Repair or replace connector. Then go to Step 10 .
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STEP 3. Check the harness between the junction block connector C-205 and auto-cruise control-ECU connector C-113. Q: Is the check result normal?
YES:
This malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points  ).
NO:
Repair harness. Then go to Step 10 .
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STEP 4. Measure at auto-cruise control-ECU connector C-113.
Disconnect auto-cruise control-ECU connector C-113 and measure at the harness side.
- Continuity between terminal 14 and body earth.
OK: Continuity
Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Go to Step 5 .
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STEP 5. Check auto-cruise control-ECU connector C-113 and joint connector (2) C-17 <R.H. drive vehicles only>. Q: Is the check result normal?
YES:
Go to Step 6 .
NO:
Repair or replace connector. Then go to Step 10 .
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STEP 6. Check the harness between the auto-cruise control-ECU connector C-113 and body earth. Q: Is the check result normal?
YES:
This malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).
NO:
Repair harness. Then go to Step 10 .
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STEP 7. Check auto-cruise control-ECU connector C-113, diagnosis connector C-24 and intermediate connector C-105 <R.H. drive vehicles only>. Q: Is the check result normal?
YES:
Go to Step 8 .
NO:
Repair or replace connector. Then go to Step 10 .
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STEP 8. Check the harness between the auto-cruise control-ECU connector C-113 and diagnosis connector C-24. Q: Is the check result normal?
YES:
Go to Step 9 .
NO:
Repair harness. Then go to Step 10 .
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STEP 9. Retest the system. Q: Does a malfunction take place again?
YES:
Replace the auto-cruise control-ECU (Refer to ). Then go to Step 10 .
NO:
This malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).
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STEP 10. Retest the system. Q: Does a malfunction take place again?
YES:
Return to Step 1 .
NO:
This malfunction is eliminated.
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