Service Procedure
ECM Re-communication Function1. Re-communicate the ECM with the BCM or Intelligent key.
^ Performing the following procedure can automatically perform a re-communication of a new ECM with a BCM or Intelligent Key unit (not all models supported) so that the NATS keys do not need to be registered.
^ This Function will only work when the ECM has been replaced with a new one which has never been energized onboard.
^ If this function is not supported all of the keys may need to be individually registered.
a. Install new ECM.
b. Use a registered key (*) to turn ignition switch to "ON". * To perform this step, use a key that is registered to the original ECM that was replaced.
c. Maintain ignition switch in the "ON" position for at least 5 seconds.
d. Turn ignition switch to "OFF".
e. Start engine.
> If engine can be started continue to step 3.
2. If engine will NOT start, after you perform the ECM Re-Communication Function, all ignition keys will need to be individually registered, including spare keys with CIII plus and then proceed with step 3.
^ Refer to the Immobilizer tab on the CIII plus home page to register keys.
NOTE:
^ When registering new Key IDs or replacing the ECM with other than brand new unit, refer to the Immobilizer tab on the CIII plus home page.
^ If multiple keys are attached to the key holder, separate them before work.
^ Distinguish keys with unregistered key ID from those with registered ID.
Accelerator Pedal & Throttle Valve Closed Position Learning
3. Perform the Accelerator Pedal & Throttle Valve Closed Position Learning as follows:
a. Make sure the accelerator pedal is fully released.
b. Turn the ignition switch "ON" for 2 seconds.
c. Turn the ignition switch "OFF" for 10 seconds.
d. Turn the ignition switch "ON" for 2 seconds, then
e. Turn the ignition switch "OFF" again for 10 seconds (see Figure 1).
f. Proceed with step 4 (below).
Perform Idle Air Volume Learning (IAVL)
NOTE:
Make sure all electrical loads are turned OFF, including A/C, defroster, radio, lights, etc. while performing the following procedures. Also, make sure the engine cooling fans are NOT operating during the following procedures.
4. Perform the Idle Air Volume Learning procedure as follows:
a. Connect CIII plus to the vehicle.
b. Warm up engine and transmission to operating temperature.
NOTE:
Vehicle may have to be driven to warm transmission enough to allow IAVL to complete.
c. In the CIII plus "Maintenance mode", select "IDLE AIR VOL LEARN" and then "Confirm". See Figure 2.
d. Press "Next" then "Start" on the IDLE AIR VOL LEARN screen. See Figure 3.
^ START cannot be selected until all operating conditions have been met.
^ The IAVL procedure will take several minutes to complete.
^ CIII plus will display "EXECUTING" in the "Current status" box while the IAVL EXECUTING procedure is in process. See Figure 4.
^ CIII plus will display "COMPLETE" in the Current status box when the IAVL procedure is finished. See Figure 5.
f. Once the IAVL procedure is finished, proceed with step 5 (below).
For 2005 and Later MY Vehicles ONLY: Enter VIN into New Service Replacement ECM
5. Enter the VIN into the new service replacement ECM as follows:
a. Select "Diagnosis (One System)", "ENGINE", "Work support" and "VIN REGISTRATION". See Figure 6.
b. Enter the vehicle VIN in both the VIN (1st TIME) and VIN (2nd TIME) boxes, then select Start. See Figure 7.
c. Once completed (COMAND SUCCEDED; See Figure 8) turn the ignition off for 10 seconds, then back on and check for any DTCs.
d. Select "READ VIN" and confirm that the VIN is correct.
^ If VIN does not display it can also be checked through the "RE/programming, Configuration" tab.
Check for ECM Updates
6. Check and confirm that ECM is updated to most recent part number and perform reprogram procedure if not most current.
> Select and use the reprogramming option that does not have the message "Caution! Use ONLY with NTBXX-XXX".
^ If you are not familiar with checking for an ECM update or with the reprogramming procedure, refer to the C-III plus "ECM Reprogramming general procedure".
^ If an update is not listed and a blank screen is displayed (see figure 9), a reprogram is not available for the ECM.