[17] ENGINE AND EMISSION CONTROL - - AUTO-CRUISE CONTROL <4G69-VEHICLES WITH AUTO-CRUISE CONTROL SYSTEM> - SYMPTOM PROCEDURES - Inspection Procedure 5: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set Vehicle Speed.PRINT PAGE / INDEX / PRIOR / NEXT
Inspection Procedure 5: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set Vehicle Speed.
COMMENTS ON TROUBLE SYMPTOM
The output shaft speed sensor signal or the throttle body is suspected.
PROBABLE CAUSES
  • Malfunction of the output shaft speed sensor.
  • Malfunction of the throttle body.
  • Malfunction of the engine-A/T-ECU.
DIAGNOSIS PROCEDURE
STEP 1. Check the A/T system diagnosis code.
Q: Is any diagnosis code set?
YES:  Repair the A/T system (Refer to GROUP 23A, Troubleshooting <A/T> - Check chart for diagnosis codes ). Then go to Step 4.
NO:  Go to Step 2.
STEP 2. Check the MPI system diagnosis code.
Q: Is any diagnosis code set?
YES:  Repair the MPI control system (Refer to GROUP 13C, Troubleshooting - Inspection chart for diagnosis code Trouble Code Chart ). Then go to Step 4 .
NO:  Go to Step 3.
STEP 3. Retest the system
Q: Does a hunting occur?
YES:  Replace the engine-A/T-ECU (Refer to GROUP 13C, Engine-A/T-ECU ). Then go to Step 4.
NO:  It can be assumed that this malfunction is intermittent.
STEP 4. Retest the system
Q: Does a hunting occur?
YES:  Return to Step 1.
NO:  The procedure is complete.
[17] ENGINE AND EMISSION CONTROL - - AUTO-CRUISE CONTROL <4G69-VEHICLES WITH AUTO-CRUISE CONTROL SYSTEM> - SYMPTOM PROCEDURES - Inspection Procedure 5: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set Vehicle Speed.PRINT PAGE / INDEX / PRIOR / NEXT
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