Montero Sport LTD 4WD V6-3.5L SOHC (1999)
Idle Speed/Throttle Actuator - Electronic: Symptom Related Diagnostic Procedures
9. Idle Speed Is High (Improper Idle Speed)
COMMENT
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In cases such as the above, the cause is probably that the intake air volume during idle is too small.
TROUBLESHOOTING HINTS
The most likely causes for this case:
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Malfunction of the IAC system.
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Malfunction of the throttle body.
DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)
CAUTION: To prevent damage to the scan tool, turn the ignition switch "OFF" before connecting or disconnecting the scan tool.
STEP 1.
Using scan tool MB991502, read the diagnostic trouble code (DTC).
If DTC is not output, go to Step 2.
If DTC is output. See Trouble Code Descriptions>
If DTC is not output, go to Step 2.
If DTC is output. See Trouble Code Descriptions>
STEP 2.
Check the idle air control (IAC) motor operation sound.
1. Check that the engine coolant temperature is 20 °C (68 °F) or below.
NOTE: Disconnecting the engine coolant temperature sensor connector and connecting the harness side of the connector to another
engine coolant temperature sensor that is at 20 °C (68 °F) or below is also okay.
2. Check the operation sound of the IAC motor can be heard after the ignition is switched "ON" (but without starting the engine).
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An operation sound should be heard. If a sound is heard, go to Step 3.
If no sound is heard, refer to DTC P0505 - Idle Control System Malfunction.
