[17] ENGINE AND EMISSION CONTROL - - AUTO-CRUISE CONTROL <4G64-VEHICLES WITH AUTO-CRUISE CONTROL SYSTEM> - SYMPTOM PROCEDURES - Inspection Procedure 6: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set Vehicle Speed. | PRINT PAGE / INDEX / PRIOR / NEXT

Inspection Procedure 6: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set Vehicle Speed.
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.
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.
DIAGNOSIS PROCEDURE
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.
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.
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.
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 ).
STEP 5. Retest the system. Q: Does a malfunction take place again? YES: Return to Step 1. NO: This malfunction is eliminated.

[17] ENGINE AND EMISSION CONTROL - - AUTO-CRUISE CONTROL <4G64-VEHICLES WITH AUTO-CRUISE CONTROL SYSTEM> - SYMPTOM PROCEDURES - Inspection Procedure 6: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set Vehicle Speed. | PRINT PAGE / INDEX / PRIOR / NEXT

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