Work Procedure

Idle Air Volume Learning is a function of ECM to learn the idle air volume that keeps engine idle speed within the specific range. It must be performed under the following conditions:

Each time the electric throttle control actuator or ECM is replaced.
Idle speed or ignition timing is out of the specification.

PRECONDITIONING
Check that all of the following conditions are satisfied.

Learning will be cancelled if any of the following conditions are missed for even a moment.
- Battery voltage: More than 12.9 V (At idle)
- Engine coolant temperature: 70 - 105 deg.C (158 - 221 deg.F)
- Selector lever position: P or N
- Electric load switch: OFF
  (Air conditioner, headlamp, rear window defogger)
  
  On vehicles equipped with daytime light systems, if the parking brake is applied before the engine is started the headlamp will not illuminate.
- Steering wheel: Neutral (Straight-ahead position)
- Vehicle speed: Stopped
- Transmission: Warmed-up
  - With CONSULT: Drive vehicle until "ATF TEMP 2" in "DATA MONITOR" mode of "A/T" system indicates less than 0.9 V.
  - Without CONSULT: Drive vehicle for 10 minutes.
YES

GO TO 2.
PERFORM IDLE AIR VOLUME LEARNING
WITH CONSULT
1. Perform Accelerator Pedal Released Position Learning. Refer to Work Procedure .
2. Perform Throttle Valve Closed Position Learning. Refer to Work Procedure .
3. Start engine and warm it up to normal operating temperature.
4. Select "IDLE AIR VOL LEARN" in "WORK SUPPORT" mode.
5. Touch "START" and wait 20 seconds.
Is "CMPLT" displayed on CONSULT screen?

YES

GO TO 3.

NO

GO TO 4.
CHECK IDLE SPEED AND IGNITION TIMING
Rev up engine two or three times and check that idle speed and ignition timing are within the specifications.

For procedure, Refer to IDLE SPEED : Periodic Maintenance Operation . and Refer to IGNITION TIMING : Periodic Maintenance Operation .

For specifications, Refer to IDLE SPEED : Service Data . and Refer to IGNITION TIMING : Service Data .

Is the inspection result normal?

YES

INSPECTION END

NO

GO TO 4.
DETECT MALFUNCTIONING PART-I
Check the following
- Check that throttle valve is fully closed.
- Check PCV valve operation.
- Check that downstream of throttle valve is free from air leakage.
Is the inspection result normal?

YES

GO TO 5.

NO

Repair or replace malfunctioning part.
DETECT MALFUNCTIONING PART-II
Engine component parts and their installation condition are questionable. Check and eliminate the cause of the incident.

It is useful to perform "TROUBLE DIAGNOSIS - SPECIFICATION VALUE". Refer to Component Function Check .

If any of the following conditions occur after the engine has started, eliminate the cause of the incident and perform Idle Air Volume Learning again:
- Engine stalls.
- Incorrect idle.
INSPECTION END