Inspection Procedure 14

COMMENT
- In cases such as the above, the intake air volume may be insufficient due to a defective idle air control motor system.

TROUBLESHOOTING HINTS
The most likely causes for this case:
- Malfunction of the IAC system.

DIAGNOSIS
Required Special Tool:
M8991502: Scan Tool (MUT-II)

STEP 1. Check if the battery terminal is disconnected
Has the battery terminal been disconnected lately?

If no, go to Step 2.

If yes, start the engine and let it run at idle for approximate 10 minutes after warm-up. Then, if a malfunction occurs, go to Step 2.

CAUTION: To prevent damage to the scan tool, turn the ignition switch "OFF" before connecting or disconnecting the scan tool.




STEP 2. Using scan tool MB991502, read the diagnostic trouble code (DTC).
If DTC is not output, go to Step 3.

If DTC is output, refer to Diagnostic Trouble Code Chart.

CAUTION: To prevent damage to the scan tool, turn the ignition switch "OFF" before connecting or disconnecting the scan tool.




STEP 3. Using scan tool MB991502, check data list and actuator test.
1. Check the following items in the data list.
Refer to Data List Reference Table.

a. Item 26: Closed Throttle Position Switch <3.0L Engine>.
b. Item 14: Throttle Position Sensor.

2. Check the following items in the actuator test.
Refer to Actuator Test Reference Table.

a. Item 10: EGR Solenoid.

If the checks above meet the specifications, go to Step 4.

If the checks above do not meet the specifications, repair or replace. Then confirm that the malfunction symptom is eliminated.

CAUTION: To prevent damage to the scan tool, turn the ignition switch "OFF" before connecting or disconnecting the scan tool.




STEP 4. Using scan tool MB991502, check data list item 45: Idle Air Control Position.
- The idle air control motor should drop to the 0 - 2 position during deceleration (from 1,000 r/min or more).

If the idle air control motor does not drop to the position, go to Step 5.

If the idle air control motor drops to that position, refer to DTC P0500 - Vehicle Speed Sensor Malfunction.

STEP 5. Check the following items.
1. Check the following items, and repair, replace, clean or adjust the defective sections.

a. Check the ignition coil, spark plugs, spark plug cables.
b. Clean the throttle valve area.
c. Check and adjust the fixed SAS <3.0L Engine>.
Then replacing, cleaning or adjusting, confirm that the malfunction symptom is eliminated.