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Inspection Procedure 6: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set Vehicle Speed.
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COMMENTS ON TROUBLE SYMPTOM
The cause is probably a malfunction of vehicle speed signal or incorrect vacuum in the auto-cruise vacuum pump or vacuum actuator.
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PROBABLE CAUSES
- Malfunction of the connector.
- Malfunction of the harness.
- Malfunction of the auto-cruise vacuum pump.
- Malfunction of the vacuum actuator.
- Malfunction of the auto-cruise control-ECU.
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STEP 1. Check the vehicle speed signal.
Check the MUT-II/III diagnosis codes.
Q: Is the MUT-II/III diagnosis code No.12 set?
YES:
Inspect for each trouble symptom (Refer to inspection diagnosis code No.12  ). Then go to Step 5  .
NO:
Go to Step 2 .
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STEP 2. Check the auto-cruise vacuum pump.
Refer to .
Q: Is the check result normal?
YES:
Go to Step 3 .
NO:
Replace the auto-cruise vacuum pump (Refer to ). Then go to Step 5 .
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STEP 3. Check the vacuum actuator.
Refer to .
Q: Is the check result normal?
YES:
Go to Step 4 .
NO:
Replace the vacuum actuator (Refer to GROUP 13B - Throttle body ). Then go to Step 5 .
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STEP 4. Retest the system. Q: Does a malfunction take place again?
YES:
Replace the auto-cruise control-ECU (Refer to ). Then go to Step 5 .
NO:
This malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).
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STEP 5. Retest the system. Q: Does a malfunction take place again?
YES:
Return to Step 1 .
NO:
This malfunction is eliminated.
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