Inspection Procedure 14

COMMENT
- 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:
MB991502: Scan Tool (MUT-II)

STEP 1.Check if the battery terminal is disconnected.

Q: Has the battery terminal been disconnected lately?

YES: Start the engine and let it run at idle for approximate 10 minutes after engine warm up. Then if a malfunction occurs, go to step 2.

NO: Go to Step 2.




STEP 2.Using scan tool MB991502, read the diagnostic trouble code (DTC).

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Read the DTC.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC is output?

YES: Refer to Diagnostic Trouble Code Chart.

NO: Go to Step 3.




STEP 3.Using scan tool MB991502, check data list.
1. Turn the ignition switch to the "ON" position.
2. 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.

3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES: Go to Step 4.

NO: Repair or replace. Then confirm that the malfunction symptom is eliminated.




STEP 4.Using scan tool MB991502, check actuator test.
1. Turn the ignition switch to the "ON" position.
2. Check the following items in the actuator test. Refer to Actuator Test Reference Table.
a. Item 10: EGR Solenoid.
3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the actuator operating properly?

YES: Go to Step 5.

NO: Repair or replace. Then confirm that the malfunction symptom is eliminated.




STEP 5.Using scan tool MB991502, check data list item 45: Idle Air Control Position.
1. Start the engine and run at idle.
2. Set scan tool MB991502 to the data reading mode for item 45, Idle Air Control Position.
a. The idle air control motor should drop to the 0 - 2 position during deceleration (from 1,000 r/min or more).
3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the actuator operation properly?

YES: Check the following items, and repair, replace, clean or adjust the defective sections.
a. Check the ignition coil, spark plugs, spark plug cables.
b. Check the throttle valve area.
c. Check and adjust the fixed SAS <3.0L Engine>
Then confirm that the malfunction symptom is eliminated.

NO: Refer to DTC P0500 - Vehicle Speed Sensor Malfunction.