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

Work Procedure (Before Replacing Electric Throttle Control Actuator)

1. CHECK DTC 

   Perform DTC P0101 confirmation procedure. Refer to Confirmation Procedure . Is the DTC P0101 displayed?

   YES>>

   GO TO 2

   .

   NO>>

   • Replace electric throttle control actuator. Refer to INTAKE MANIFOLD : Removal and Installation .
   • After replacing electric throttle control actuator, perform necessary work.
2. PRECONDITIONING 

   Make sure 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°C (158 - 221°F)
   • Selector lever: P or N
   • Electric load switch: OFF

     (Air conditioner, headlamp, rear window defogger)

   • On vehicles equipped with daytime running light systems, set lighting switch to the 1st position to light only small lamps.
   • Steering wheel: Neutral (Straight-ahead position) position
   • Vehicle speed: Stopped
   • Transmission: Warmed-up
     • With CONSULT : Drive vehicle until "ATF TEMP SEN" in "DATA MONITOR" mode of "TRANSMISSION" system indicates less than 0.9 V.
     • Without CONSULT : Drive vehicle for 10 minutes.

   >>

   GO TO 3

   .

3. 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 with CONSULT.
   5. Touch "START" and wait 20 seconds.

   Is "CMPLT" displayed on CONSULT screen?

   YES>>

   • Replace electric throttle control actuator. Refer to INTAKE MANIFOLD : Removal and Installation .
   • After replacing electric throttle control actuator, perform necessary work.

   NO>>

   Retry from step 2.

Work Procedure (After Replacing Electric Throttle Control Actuator)

1. PRECONDITIONING 

   Make sure 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°C (158 - 221°F)
   • Selector lever: P or N
   • Electric load switch: OFF

     (Air conditioner, headlamp, rear window defogger)

     On vehicles equipped with daytime running light systems, set lighting switch to the 1st position to light only small lamps.

   • Steering wheel: Neutral (Straight-ahead position)
   • Vehicle speed: Stopped
   • Transmission: Warmed-up
   • With CONSULT : Drive vehicle until "ATF TEMP SE 1" in "DATA MONITOR" mode of "A/T" system indicates less than 0.9V.
   • Without CONSULT : Drive vehicle for 10 minutes.

   >>

   GO TO 2.

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.

3. CHECK IDLE SPEED AND IGNITION TIMING 
   1. Start engine and warm it up to normal operating temperature.
   2. Let it idle for 20 seconds.
   3. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications. Refer to IDLE SPEED : Periodic Maintenance and IGNITION TIMING : Periodic Maintenance .

   Is the inspection result normal?

   YES>>

   INSPECTION END

   NO>>

   GO TO 4.

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.

5. 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 Diagnosis Description . 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.
   • Erroneous idle.

   >>

   INSPECTION END